Nowadays, with quick construction of society and rapid development of technology, more and more different kinds of steel pipes are created, such as welded steel pipe, seamless steel pipe, ERW steel pipe and so on, and more and more steel pipes are needed. In the competitive market of steel pipe, ERW steel pipe, seamless pipe and welded steel pipe are well sold thanks to their specific characteristics.
There are a few aspects of differences between ERW steel pipe and seamless steelpipe. ERW pipe, which is short for electric resistance welding, is used in delivery of liquid, such as fuel, gas and so on, regardless the requirement of pressure, which plays an important role in the conveying tube all over the world, while seamless pipe is a kind of steel pipe shaping square and rectangle and having no seam around with hollow cross-sections, which is used in conveying liquid but also making structural members and machine parts, due to its surprisingly high anti-bending and anti-torque strength and impossibly lightness. All in all, ERW pipe and seamless steel pipe is quite different in use of structural steel pipe.
What's more, the biggest difference between ERW pipe and seamless steel pipe is that ERW pipe has welding line, which is the same as welded steel pipe, but seamless black steel pipe doesn't have, either does the welded steel pipe. Furthermore, the welding line of ERW pipe is the key to the quality of ERW steel pipe. The more unrecognizable the welding line of ERW pipe is, the higher quality ERW pipe has. As an old saying goes ‘hard work pays off', with scientists' continuous hard study, a huge success in eliminating the welding line of ERW pipe has been achieved. There are two ways to eliminate the welding line: geometric seamlessly and physical seamlessly. Geometric seamlessly is to eliminate the burr both inside and outside while physical seamlessly is to take steps to make base metal and metallographic structure uniform and consistent, which seems more complicate to achieve, however, a ERW pipe without a welding line can be successfully attained through which. Compared with processing technique of ERW pipe, the processing technique of seamless steel pipe is much simpler. There are two entirely different types of processing technique: cold-drawing and hot rolling. Compared with hot rolling, the technological process of cold-drawing is more complicated. Moreover, in the appearance, cold-drawn seamless stainless steel pipe is shorter than hot-rolled one and the wall thickness of cold-drawn seamless stainless steel pipe is generally smaller than the wall thickness of hot-rolled one. What's more, the technological process of hot rolling needs high temperature which reduces the resistance of deformation so that a big deflection is achieved. Generally speaking, the technological processing of ERW pipe and seamless steel pipe are quite different, due to the different appearance.
In general, although ERW pipe and seamless steel pipe both play an important role as well the welded steel pipe do in the construction of society, ERW pipe and seamless mild steel pipe has different use and different making progress thanks to their different appearance. Scientists have always been paying a lot to improve their property, which is aimed to make them more multifunctional and to reduce the cost of processing. Maybe one day, ERW pipe and seamless steel pipe will have little differences.
2018年8月29日星期三
Selection of seamless steel pipe cutting machine
According to the characteristics of the above seamless steel pipe, we should pay attention to the following points when choosing a seamless steel pipe cutting machine:
1. Cutting ability: Seamless pipes are generally thicker. Therefore, the first thing to consider when choosing a seamless pipe cutting machine is whether this pipe cutting machine can cut the seamless pipe that needs to be processed, because everyone is using cutting. When the pipe machine is used, its cutting ability is directly related to the effect and efficiency of the pipe cutting work. Therefore, the cutting ability of this seamless pipe cutting machine is the primary consideration when choosing.
2. Cutting machine performance: As far as the application of seamless pipe cutting machine is concerned, it needs to have very high performance, in order to be able to have very good guarantee in the production process, in terms of service life and application safety. The impact of a stable and compact cutting machine on the efficiency of our production process is self-evident. From this point of view, the performance of the cutting machine is also an important consideration.
3. The cost of the cutting machine: For the seamless pipe cutting machine users, the best choice for the purchase of cutting machine equipment should be cost-effective products. Of course, it is not good to choose expensive ones. It depends on how much value this cutting machine can create for our company. A cost-effective cutting machine plays an important role in improving work efficiency and saving production costs!
http://www.xysteelpipe.com/info/Selection-of-seamless-steel-pipe-cutting-machine-1268-1.htm
1. Cutting ability: Seamless pipes are generally thicker. Therefore, the first thing to consider when choosing a seamless pipe cutting machine is whether this pipe cutting machine can cut the seamless pipe that needs to be processed, because everyone is using cutting. When the pipe machine is used, its cutting ability is directly related to the effect and efficiency of the pipe cutting work. Therefore, the cutting ability of this seamless pipe cutting machine is the primary consideration when choosing.
2. Cutting machine performance: As far as the application of seamless pipe cutting machine is concerned, it needs to have very high performance, in order to be able to have very good guarantee in the production process, in terms of service life and application safety. The impact of a stable and compact cutting machine on the efficiency of our production process is self-evident. From this point of view, the performance of the cutting machine is also an important consideration.
3. The cost of the cutting machine: For the seamless pipe cutting machine users, the best choice for the purchase of cutting machine equipment should be cost-effective products. Of course, it is not good to choose expensive ones. It depends on how much value this cutting machine can create for our company. A cost-effective cutting machine plays an important role in improving work efficiency and saving production costs!
http://www.xysteelpipe.com/info/Selection-of-seamless-steel-pipe-cutting-machine-1268-1.htm
2018年8月28日星期二
Defects on the outer surface of hot rolled seamless steel tube
Outer surface defects of hot-rolled seamless steel pipe.
1. An outer fold: the outer surface of the pipe presents a layered folded spiral.
2. separation: presenting a spiral shape or blocky delamination and cracking.
3. external scarring: scars on the outer surface.
4. pock surface: steel surface showed uneven pits.
5. Line: a substantially symmetrical or asymmetrical linear rolling marks.
6. Hairline: a continuous or discontinuous hairy fine lines.
7. net cracks: scaly small cracks.
8. scratches: linear or spiral-shaped groove-like defects.
9. touch deflated: the outer surface of the steel pipe rendered in a convex outer concave phenomenon, and pipe wall thickness without injury.
10. bumps: collision irregular scars.
11. straightening recess: steel spiral concave outer surface.
12. rolled off: longitudinally local or long presentation in a convex outer concave folds, the outer surface into strips depression.
13. crack:opened the rupture surface phenomenon, much produced in the thin-walled tube.
1. An outer fold: the outer surface of the pipe presents a layered folded spiral.
2. separation: presenting a spiral shape or blocky delamination and cracking.
3. external scarring: scars on the outer surface.
4. pock surface: steel surface showed uneven pits.
5. Line: a substantially symmetrical or asymmetrical linear rolling marks.
6. Hairline: a continuous or discontinuous hairy fine lines.
7. net cracks: scaly small cracks.
8. scratches: linear or spiral-shaped groove-like defects.
9. touch deflated: the outer surface of the steel pipe rendered in a convex outer concave phenomenon, and pipe wall thickness without injury.
10. bumps: collision irregular scars.
11. straightening recess: steel spiral concave outer surface.
12. rolled off: longitudinally local or long presentation in a convex outer concave folds, the outer surface into strips depression.
13. crack:opened the rupture surface phenomenon, much produced in the thin-walled tube.
Seamless Stainless Steel Pipe Crack Detection Method
We know that the seamless stainless steel pipe has a quality demanding for seamless pipe in the environment of high temperature and pressure.
The cracks on the pipe, as a result of improper machining operation process in the production process may roll or drawing die setting improper reasons, folded, Alice skin, scratches or strain, surface and internal defects. In order to ensure seamless pipe quality, according to the relevant technical standards for products, seamless steel pipe production line required nondestructive testing of surface and interior. Commonly used eddy current testing and magnetic flux leakage detection technology.
Eddy current testing is to establish a non-destructive detection method on the basis of the electromagnetic induction, it will sine current excitation probes coil, when the probe near the Seamless surface, an alternating magnetic field in the coil around the rims surface induced electromotive force generated induced current, i.e. a vortex. The snails and feelings generated magnetic field acting on the coil, thereby changing the electrical parameters of the coil.
The loss resistance of the vortex channel and the eddy-current generation of anti-flux, but also reflected to the probe coil, changing the size and phase of the current in the coil, which changes the impedance of the coil. The probe in the seamless steel surface is moved relative defects encountered, so that the reaction of the eddy current magnetic field of the coil, causing the change of coil impedance, thereby measuring the amount of change identified seamless steel pipe surface defects.
Stainless steel seamless pipe has a high requirement on quality in the environment of high temperature and pressure. Improper machining operation process in the production process may roll or drawing die setting improper reasons and on the pipe, as a result of a crack. Folding, warping, scratches, or strain, surface and internal defects. In order to ensure seamless pipe quality, according to the relevant technical standards for products, seamless steel pipe production line required nondestructive testing of surface and interior. Commonly used eddy current testing and magnetic flux leakage detection technology.
Eddy current testing is to establish a non-destructive detection method, on the basis of the electromagnetic induction it sine current excitation probe coil, the induced electromotive force generated when the probe near the Seamless surface, the alternating magnetic field around the coil rims surface generates an induction current, i.e. vortex. The vortex is also the feelings generated magnetic field acting on the coil, thereby changing the electrical parameters of the coil. The loss resistance of the vortex channel and the eddy-current generation of anti-flux, but also reflected to the probe coil, changing the size and phase of the current in the coil, which changes the impedance of the coil. The probe in the seamless steel surface is moved relative defects encountered, so that the reaction of the eddy current magnetic field of the coil, causing the change of coil impedance, thereby measuring the amount of change identified seamless steel pipe surface defects.
The cracks on the pipe, as a result of improper machining operation process in the production process may roll or drawing die setting improper reasons, folded, Alice skin, scratches or strain, surface and internal defects. In order to ensure seamless pipe quality, according to the relevant technical standards for products, seamless steel pipe production line required nondestructive testing of surface and interior. Commonly used eddy current testing and magnetic flux leakage detection technology.
Eddy current testing is to establish a non-destructive detection method on the basis of the electromagnetic induction, it will sine current excitation probes coil, when the probe near the Seamless surface, an alternating magnetic field in the coil around the rims surface induced electromotive force generated induced current, i.e. a vortex. The snails and feelings generated magnetic field acting on the coil, thereby changing the electrical parameters of the coil.
The loss resistance of the vortex channel and the eddy-current generation of anti-flux, but also reflected to the probe coil, changing the size and phase of the current in the coil, which changes the impedance of the coil. The probe in the seamless steel surface is moved relative defects encountered, so that the reaction of the eddy current magnetic field of the coil, causing the change of coil impedance, thereby measuring the amount of change identified seamless steel pipe surface defects.
Stainless steel seamless pipe has a high requirement on quality in the environment of high temperature and pressure. Improper machining operation process in the production process may roll or drawing die setting improper reasons and on the pipe, as a result of a crack. Folding, warping, scratches, or strain, surface and internal defects. In order to ensure seamless pipe quality, according to the relevant technical standards for products, seamless steel pipe production line required nondestructive testing of surface and interior. Commonly used eddy current testing and magnetic flux leakage detection technology.
Eddy current testing is to establish a non-destructive detection method, on the basis of the electromagnetic induction it sine current excitation probe coil, the induced electromotive force generated when the probe near the Seamless surface, the alternating magnetic field around the coil rims surface generates an induction current, i.e. vortex. The vortex is also the feelings generated magnetic field acting on the coil, thereby changing the electrical parameters of the coil. The loss resistance of the vortex channel and the eddy-current generation of anti-flux, but also reflected to the probe coil, changing the size and phase of the current in the coil, which changes the impedance of the coil. The probe in the seamless steel surface is moved relative defects encountered, so that the reaction of the eddy current magnetic field of the coil, causing the change of coil impedance, thereby measuring the amount of change identified seamless steel pipe surface defects.
Seamless steel tube quality inspection
Seamless steel pipe quality testing is a very important step, and for its detection method is also very particular to now all three - ultrasonic testing, eddy current testing, magnetic flux leakage testing, here we will introduce you specific circumstances non-destructive testing.
Nondestructive Testing, shorted for NDT, is a widely-used method in pipeline inspection. It is a process of testing, inspecting and evaluating the quality and characteristics of the material without damaging the pipeline itself or affecting the later regular work of the pipe. In other words, after NDT testing, the part can still be put into practical use. NDT utilizes the changes in heat, sound and magnets caused by abnormal inner structure or flaws to inspect the internal and external defects of the material.
The common inspection methods of NDT are visual testing (VT), ultrasonic testing (UT), radiographic testing (RT), hydrostatic testing.
In order to verify the mechanical properties of seamless steel pipe to meet the requirements of the standard, the test sample of seamless steel pipe mechanical performance should be prepared carefully. Mechanical property test includes tensile strength, yield strength, elongation, impact energy and so on. Process performance test includes flattening test, flaring test, hydrostatic testing, curling trials, cold bend test, perforation test. These test items are based on different standards and different uses of seamless steel tubes.
Nondestructive Testing, shorted for NDT, is a widely-used method in pipeline inspection. It is a process of testing, inspecting and evaluating the quality and characteristics of the material without damaging the pipeline itself or affecting the later regular work of the pipe. In other words, after NDT testing, the part can still be put into practical use. NDT utilizes the changes in heat, sound and magnets caused by abnormal inner structure or flaws to inspect the internal and external defects of the material.
The common inspection methods of NDT are visual testing (VT), ultrasonic testing (UT), radiographic testing (RT), hydrostatic testing.
In order to verify the mechanical properties of seamless steel pipe to meet the requirements of the standard, the test sample of seamless steel pipe mechanical performance should be prepared carefully. Mechanical property test includes tensile strength, yield strength, elongation, impact energy and so on. Process performance test includes flattening test, flaring test, hydrostatic testing, curling trials, cold bend test, perforation test. These test items are based on different standards and different uses of seamless steel tubes.
2018年8月16日星期四
The Material Classification of Carbon Steel Elbow
Carbon steel can be divided into 10# 20# A3 Q235A 20g Q345B 20G 16Mn ASTM A234 ASTM A105 st37 ASTM A403 et. The elbows made of these materials as raw materials can be called carbon steel elbows.
According to the angle: 45°, 90°, 180°, these three commonly used elbows, and other engineering needs, can be specially customized such as 60 ° or other angles.
Connection with carbon steel pipe: welding, flange connection, screw connection, socket connection and other forms.
According to the process form can be divided: welding elbows, stamping elbows, casting elbows and so on.
Uses: Connect two tubes to change the direction of the tube, turning to 45° or 180° and 90° or other angles.
Manufacturing standards: national standard, American standard, Japanese standard, German standard, and Russian standard.
The basic process of a carbon steel elbow is to first weld a multi-prism ring shell with a polygonal cross-section or a polygonal prismatic shell with both ends closed. After the interior is filled with pressure medium, internal pressure is applied and the cross-section under internal pressure is applied. From a polygon to a circle, it eventually becomes a circular shell. According to need, a circular ring shell can be cut into 4 90° elbows or 6 60° elbows or other size elbows. The process is suitable for manufacturing any elbow diameter and elbow ID ratio greater than 1.5 times. Specifications Large elbows are an ideal way to make large carbon steel elbows.
The advantages of the carbon steel elbow production process are mainly manifested in the following aspects:
(1) Tube blanks are not needed as raw materials, which can save the cost of the tube equipment and molds, and can obtain carbon steel elbows with any large diameter and relatively thin wall thickness.
(2) The blank is a flat or developable surface, so the material is simple, the accuracy is easy to ensure, and the assembly and welding are convenient.
(3) Due to the above two reasons, the manufacturing cycle can be shortened and the production cost can be greatly reduced. Because it does not require any special equipment, it is especially suitable for on-site processing of large-scale carbon steel elbows.
(4) Carbon steel elbows are suitable for the pipeline series of petroleum, natural gas, chemical, hydropower, construction and boiler industries.
According to the angle: 45°, 90°, 180°, these three commonly used elbows, and other engineering needs, can be specially customized such as 60 ° or other angles.
Connection with carbon steel pipe: welding, flange connection, screw connection, socket connection and other forms.
According to the process form can be divided: welding elbows, stamping elbows, casting elbows and so on.
Uses: Connect two tubes to change the direction of the tube, turning to 45° or 180° and 90° or other angles.
Manufacturing standards: national standard, American standard, Japanese standard, German standard, and Russian standard.
The basic process of a carbon steel elbow is to first weld a multi-prism ring shell with a polygonal cross-section or a polygonal prismatic shell with both ends closed. After the interior is filled with pressure medium, internal pressure is applied and the cross-section under internal pressure is applied. From a polygon to a circle, it eventually becomes a circular shell. According to need, a circular ring shell can be cut into 4 90° elbows or 6 60° elbows or other size elbows. The process is suitable for manufacturing any elbow diameter and elbow ID ratio greater than 1.5 times. Specifications Large elbows are an ideal way to make large carbon steel elbows.
The advantages of the carbon steel elbow production process are mainly manifested in the following aspects:
(1) Tube blanks are not needed as raw materials, which can save the cost of the tube equipment and molds, and can obtain carbon steel elbows with any large diameter and relatively thin wall thickness.
(2) The blank is a flat or developable surface, so the material is simple, the accuracy is easy to ensure, and the assembly and welding are convenient.
(3) Due to the above two reasons, the manufacturing cycle can be shortened and the production cost can be greatly reduced. Because it does not require any special equipment, it is especially suitable for on-site processing of large-scale carbon steel elbows.
(4) Carbon steel elbows are suitable for the pipeline series of petroleum, natural gas, chemical, hydropower, construction and boiler industries.
Standard and application of square steel pipe
The square steel pipe is a term for square pipes which have the equal side length and rectangular pipes which have the unequal side length. The square steel pipe is made by the strip steel with the rolling process. Generally, the strip steel will be unpacked, flattened, curled and welded to be a round pipe, be rolled into a square pipe, and will be cut into the needed length. Square steel pipes are mainly used in fields including the mechanical industry, the chemical industry, shipbuilding, oil casings and pipelines for transporting water, gas, sewage, etc.
Standards and applications of square steel pipes
1. The standard number of the galvanized welded square steel pipes for transporting low pressure fluid is GB/T3091-2008. The typical materials of galvanized welded square steel pipes are Q235A, Q235B, Q345B, etc. Galvanized welded square steel pipes are mainly used for transporting water, coal gas, air, oil, hot water or steam, and they are limited to the transportation of low-pressure fluid.
2. The standard number of the mining welded square steel pipe is GB/T14291-2000.
3. The standard number of the large-diameter welded square steel pipes for transporting low pressure fluid is GB/T14980-1994, and the typical materials of these pipes are Q235 Grade A and Grade B. The large-diameter welded square steel pipes are mainly used to transport the low pressure fluid such as water, sewage, coal gas and air.
4. The standard number of the stainless welded square pipes for transporting fluid is GB/T12771-1991, and the typical materials of these pipes are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo, etc. The stainless welded square pipes are mainly used for transporting low pressure corrosive media.
5. The standard number of the spiral welded square pipe for transporting low pressure fluid is SY/T5037-2008, and the typical materials of these pipes are Q235B, Q345B, etc. The spiral welded square steel pipe are mainly applied to low pressure pipelines for transporting water, oil, natural gas, etc.
6. The standard number of the square pipe for transporting flammable fluid and non-flammable fluid is B/T9711.1(GB/T9711.2)-1997, and the typical materials of these pipes are from L245 to L415. The requirements on these pipes are usually high.
Standards and applications of square steel pipes
1. The standard number of the galvanized welded square steel pipes for transporting low pressure fluid is GB/T3091-2008. The typical materials of galvanized welded square steel pipes are Q235A, Q235B, Q345B, etc. Galvanized welded square steel pipes are mainly used for transporting water, coal gas, air, oil, hot water or steam, and they are limited to the transportation of low-pressure fluid.
2. The standard number of the mining welded square steel pipe is GB/T14291-2000.
3. The standard number of the large-diameter welded square steel pipes for transporting low pressure fluid is GB/T14980-1994, and the typical materials of these pipes are Q235 Grade A and Grade B. The large-diameter welded square steel pipes are mainly used to transport the low pressure fluid such as water, sewage, coal gas and air.
4. The standard number of the stainless welded square pipes for transporting fluid is GB/T12771-1991, and the typical materials of these pipes are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo, etc. The stainless welded square pipes are mainly used for transporting low pressure corrosive media.
5. The standard number of the spiral welded square pipe for transporting low pressure fluid is SY/T5037-2008, and the typical materials of these pipes are Q235B, Q345B, etc. The spiral welded square steel pipe are mainly applied to low pressure pipelines for transporting water, oil, natural gas, etc.
6. The standard number of the square pipe for transporting flammable fluid and non-flammable fluid is B/T9711.1(GB/T9711.2)-1997, and the typical materials of these pipes are from L245 to L415. The requirements on these pipes are usually high.
What's the difference between API 5L PSL1 and API 5L PSL2?
As we all know that,API 5L steel pipe mainly use for conveying the oil, water, and natural gas industries.but less people know what is the differences between API 5L PSL1 and API 5L PSL2?Here,Tianjin Xinyue Steel will show you the differences between them.
PSL refers to product specification level made for API 5L standard. Pipe specification level is divided into PSL1 and PSL2 for line pipe standard, line pipes of PSL1 and PSL2 have different levels of quality requirement.
API 5L PSL1 production does not require for impact performance, for API 5L PSL2, all pipes requires for satisfy the following data except x80 grade, full size 0 ℃ average Akv: longitudinal p j, 41 lateral acuity 27 j. Average grade X80 steel, full size 0 ℃ Akv: longitudinal 101 j, or lateral acuity 68 j.
API 5L PSL2 shows higher performance than PSL1 as it has stricter inspection requirements, chemical composition and mechanical performance requirements.
Line pipe production should include the hydraulic pressure test, and standards are not allowed to nondestructive generation of hydraulic pressure, nondestructive inspection is not required for PSL1, while each API 5L PSL2 pipe shall go through nondestructive examination one by one.
http://www.xysteelpipe.com/info/What's-the-difference-between-API-5L-PSL1-and-API-5L-PSL2-1258-1.htm
PSL refers to product specification level made for API 5L standard. Pipe specification level is divided into PSL1 and PSL2 for line pipe standard, line pipes of PSL1 and PSL2 have different levels of quality requirement.
API 5L PSL1 production does not require for impact performance, for API 5L PSL2, all pipes requires for satisfy the following data except x80 grade, full size 0 ℃ average Akv: longitudinal p j, 41 lateral acuity 27 j. Average grade X80 steel, full size 0 ℃ Akv: longitudinal 101 j, or lateral acuity 68 j.
API 5L PSL2 shows higher performance than PSL1 as it has stricter inspection requirements, chemical composition and mechanical performance requirements.
Line pipe production should include the hydraulic pressure test, and standards are not allowed to nondestructive generation of hydraulic pressure, nondestructive inspection is not required for PSL1, while each API 5L PSL2 pipe shall go through nondestructive examination one by one.
http://www.xysteelpipe.com/info/What's-the-difference-between-API-5L-PSL1-and-API-5L-PSL2-1258-1.htm
Machining error of seamless steel tube machine
The main factors that affect the machining quality of seamless steel pipe are machine tool, cutter, jig, workpiece blank, process method and processing environment.To improve the quality of seamless steel pipe cutting, we must take appropriate measures in these areas, such as reducing machine work error, the correct selection of cutting tools to improve the quality of blanks, reasonable arrangements for the process to improve environmental conditions.
Reduce the seamless machine tool cutting error usually used methods are:
1. Use with sufficient precision and stiffness of the machine.
2. If necessary, you can take the compensation correction method, such as in the thread grinder or hobbing machine, according to the previously measured machine tool chain error error correction device to correct the machine drive system error.
3. Use of machine tool fixture to ensure the accuracy of processing, such as the use of boring die processing box on the hole system, so that the accuracy of the hole from the boring die without the impact of machine positioning error.
4. To prevent the thermal deformation of the machine on the processing accuracy of the impact.
5. Eliminate the vibration source inside the machine and take vibration isolation measures to reduce the vibration on the seamless steel tube machining accuracy and roughness.
6. Improve the degree of automation of the machine, such as the use of active measurement or automatic control system to reduce the seamless machining process of human error.
Reduce the seamless machine tool cutting error usually used methods are:
1. Use with sufficient precision and stiffness of the machine.
2. If necessary, you can take the compensation correction method, such as in the thread grinder or hobbing machine, according to the previously measured machine tool chain error error correction device to correct the machine drive system error.
3. Use of machine tool fixture to ensure the accuracy of processing, such as the use of boring die processing box on the hole system, so that the accuracy of the hole from the boring die without the impact of machine positioning error.
4. To prevent the thermal deformation of the machine on the processing accuracy of the impact.
5. Eliminate the vibration source inside the machine and take vibration isolation measures to reduce the vibration on the seamless steel tube machining accuracy and roughness.
6. Improve the degree of automation of the machine, such as the use of active measurement or automatic control system to reduce the seamless machining process of human error.
The key process of precision steel pipe production
Precision pipe is the carbon, alloy or stainless steel pipe with high precision sizes. Usually it has been made through hot rolling or cold drawn (cold rolling) processes. So precision pipe is a kind of seamless pipe.
Key processes in manufacturing the precision steel pipe
During manufacturing processes, the key point is to do the annealing for raw materials.
Precision steel pipe manufacturing flow chart:
Raw Material Inspection – Remove Oxide Layer – Visual Inspection – Heating – Hot Rolling – Pickling and Passivation (Phosphating) – Grinding – Lubrication and Drying – Cold Rolling (Internal and external extraction) – Remove Oil – Ends Cutting – Inspection – Marking – Packing and Storage
As we know, most of precision steel pipe has cold drawn and hot rolled process. On the contrast, cold rolling will be more complicated. Not only the pipe need to be continuous rolled by three roller, but also the test have to be done after extrusion, so to guarantee the quality of the precision pipe materials.
Manufacturing methods of seamless precision pipe includes hot rolling and cold drawn. More over it could be manufactured in welding processes.
Key processes in manufacturing the precision steel pipe
During manufacturing processes, the key point is to do the annealing for raw materials.
Precision steel pipe manufacturing flow chart:
Raw Material Inspection – Remove Oxide Layer – Visual Inspection – Heating – Hot Rolling – Pickling and Passivation (Phosphating) – Grinding – Lubrication and Drying – Cold Rolling (Internal and external extraction) – Remove Oil – Ends Cutting – Inspection – Marking – Packing and Storage
As we know, most of precision steel pipe has cold drawn and hot rolled process. On the contrast, cold rolling will be more complicated. Not only the pipe need to be continuous rolled by three roller, but also the test have to be done after extrusion, so to guarantee the quality of the precision pipe materials.
Manufacturing methods of seamless precision pipe includes hot rolling and cold drawn. More over it could be manufactured in welding processes.
2018年8月6日星期一
Choosing scaffolding system-provide safety protection for workers
As an important component used in almost each kind of engineering project, scaffolding system would support the workers and provide demanded access to construction project. Nowadays, we know the essential role of it in globally. Whether which kind of project you've joined in, please make sure the existence of scaffolding accessories.
Safety for workers: Using high level standard scaffolding system during the construction project would ensure the great safety. It would reduce the risks of falls and injuries of workers and passerby. With the firm-flat platform offered, scaffolding would make workers move, stand and sit easily during the work.
Easy to access: another advantage of using scaffolding accessories is the the simplicity in accessing hard to reach areas. It would supply our workers with necessary height, such as small platform, sturdy base for workers. In fact, high-quality scaffolding offers better durability with great bearing capacity for a long time.
Okay, there are still factors we should keep in mind before purchase, such as flexibility, safety and unmatched quality for the workers on the construction site.
http://www.xysteelpipe.com/info/Choosing-scaffolding-system-provide-safety-protection-for-workers-1247-1.htm
Safety for workers: Using high level standard scaffolding system during the construction project would ensure the great safety. It would reduce the risks of falls and injuries of workers and passerby. With the firm-flat platform offered, scaffolding would make workers move, stand and sit easily during the work.
Easy to access: another advantage of using scaffolding accessories is the the simplicity in accessing hard to reach areas. It would supply our workers with necessary height, such as small platform, sturdy base for workers. In fact, high-quality scaffolding offers better durability with great bearing capacity for a long time.
Okay, there are still factors we should keep in mind before purchase, such as flexibility, safety and unmatched quality for the workers on the construction site.
http://www.xysteelpipe.com/info/Choosing-scaffolding-system-provide-safety-protection-for-workers-1247-1.htm
Use and standard of carbon seamless steel tube
Seamless steel pipe is widely used in our daily life, it can be used as line pipe for oil, natural gas, water and fluid transmission purpose, API 5CT Casing, API 5CT Tubing, drill pipe, boiler tube, mechanical pipe, cylinder pipe, etc. Here we will introduce the standard and usage of cabon seamless steel pipe:
API 5L Gr.B: Specifiaction for line pipe.
ASTM A 106 Gr. B: Seamless carbon steel pipes?for high-temperature service.
ASTM A 53: Specification for black steel seamless pipes.
ASTM A 161: Seamless low-carbon and carbon molybdenum steel still tubes for refinery service.
ASTM A179: Specification for seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes.
ASTM A192: Specification for seamless carbon steel boiler tubes for high-pressure service.
ASTM A 210: Specification for seamless medium-carbon steel boiler and superheater pipes.
ASTM A213: Specification for seamless ferrite alloy steel boiler, superheater and heat-exchanger pipes.
ASTM A 519: Seamless carbon and alloy steel for mechanical tubing.
ASTM A 556: Seamless cold-drawn carbon steel feedwater heater tubes.
Xinyue Steel can provide production range of seamless carbon steel pipe from 10.3mm to 914.1mm.
http://www.xysteelpipe.com/info/Use-and-standard-of-carbon-seamless-steel-tube-1248-1.htm
API 5L Gr.B: Specifiaction for line pipe.
ASTM A 106 Gr. B: Seamless carbon steel pipes?for high-temperature service.
ASTM A 53: Specification for black steel seamless pipes.
ASTM A 161: Seamless low-carbon and carbon molybdenum steel still tubes for refinery service.
ASTM A179: Specification for seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes.
ASTM A192: Specification for seamless carbon steel boiler tubes for high-pressure service.
ASTM A 210: Specification for seamless medium-carbon steel boiler and superheater pipes.
ASTM A213: Specification for seamless ferrite alloy steel boiler, superheater and heat-exchanger pipes.
ASTM A 519: Seamless carbon and alloy steel for mechanical tubing.
ASTM A 556: Seamless cold-drawn carbon steel feedwater heater tubes.
Xinyue Steel can provide production range of seamless carbon steel pipe from 10.3mm to 914.1mm.
http://www.xysteelpipe.com/info/Use-and-standard-of-carbon-seamless-steel-tube-1248-1.htm
2018年8月3日星期五
Classification of Square Steel Pipes
The square steel pipe is a term for square pipes which have the equal side length and rectangular pipes which have the unequal side length. The square steel pipe is made by the strip steel with the rolling process. Generally, the strip steel will be unpacked, flattened, curled and welded to be a round pipe, be rolled into a square pipe, and will be cut into the needed length. Square steel pipes are mainly used in fields including the mechanical industry, the chemical industry, shipbuilding, oil casings and pipelines for transporting water, gas, sewage, etc.
The classification of square steel pipes according to materials
According to materials, the square steel pipe can be divided into the common carbon steel square pipe and the low alloy square steel pipe.
The classification of square steel pipes according to production processes
According to production processes, square steel pipes can be classified into the hot rolled seamless square pipe, the cold drawn seamless square pipe, the extruded seamless square pipe and the welded square pipe.
Welded square steel pipes can be further divided into the arc welding square pipe, the ERW square pipe (high frequency, low frequency), the gas welding square pipe and the furnace welding square pipe according to the process; the longitudinal welded square pipe and the spiral welding square pipe according to the welding seam.
The classification of square steel pipes according to surface treatments
According to production processes, square steel pipes can be classified into the hot galvanized square steel pipe, the electrogalvanizing square steel pipe, the oiled square steel pipe and the acid pickling square steel pipe.
The classification of square steel pipes according to materials
According to materials, the square steel pipe can be divided into the common carbon steel square pipe and the low alloy square steel pipe.
The classification of square steel pipes according to production processes
According to production processes, square steel pipes can be classified into the hot rolled seamless square pipe, the cold drawn seamless square pipe, the extruded seamless square pipe and the welded square pipe.
Welded square steel pipes can be further divided into the arc welding square pipe, the ERW square pipe (high frequency, low frequency), the gas welding square pipe and the furnace welding square pipe according to the process; the longitudinal welded square pipe and the spiral welding square pipe according to the welding seam.
The classification of square steel pipes according to surface treatments
According to production processes, square steel pipes can be classified into the hot galvanized square steel pipe, the electrogalvanizing square steel pipe, the oiled square steel pipe and the acid pickling square steel pipe.
The Purpose Guidance Of Welded Steel Pipe
Generally speaking, the welded steel pipes are divided into general welded pipe, galvanized welded pipe, oxygen welding tube, metric system welded tube, transformer tube, welding thin wall pipe and spiral welded pipe etc.
General welded pipe: General welded pipe adopts Q195A, Q215A and Q235A or mild steel as raw materials. It is used to transfer the low pressure fluid. In addition, the pipes need water pressure, bending and flattening test etc. Usually, it has some certain requirements on the surface quality. The length of delivery is often from 4 to 10mm. The specifications of welded pipe in nominal diameter are different from actual size. Depending on the wall thickness, welded pipe are also divided into common steel pipe and thicken steel pipe.
Galvanized welded pipe: In order to enhance the corrosion resistance, the general welded pipe is galvanized zinc as protective layer. Galvanized steel pipe has two types: hot dip galvanized pipe with thicken zinc layer and electrical-galvanized pipe with low cost.
Metric system welded tube: The metric system welded tube is made from the common carbon steel, quality carbon steel or low alloy steel with the hot and cold welding or after hot welded by the cold again. The specification adopts the seamless steel pipe form with outside diameter*wall thickness (mm). The common metric system welded tube is usually used as structural elements like axis of rotation or transporting the fluid etc. The thin-walled tube is utilized for processing furniture, lamps and lanterns. But the manufacturers need to guarantee the strength and bending of steel pipe in the processing.
Spiral welded pipe: The spiral welded tube uses low carbon structural steel or low alloy structural steel strip according to certain helix angle (forming angle) rolled into a tube billet, then welded the pipe joints to be made. The spiral welded tube can use narrow strip steel to produce large diameter steel pipe. It is broadly applied as oil or natural gas pipeline. Moreover, spiral welded pipe has one side welding and double sided welding.
General welded pipe: General welded pipe adopts Q195A, Q215A and Q235A or mild steel as raw materials. It is used to transfer the low pressure fluid. In addition, the pipes need water pressure, bending and flattening test etc. Usually, it has some certain requirements on the surface quality. The length of delivery is often from 4 to 10mm. The specifications of welded pipe in nominal diameter are different from actual size. Depending on the wall thickness, welded pipe are also divided into common steel pipe and thicken steel pipe.
Galvanized welded pipe: In order to enhance the corrosion resistance, the general welded pipe is galvanized zinc as protective layer. Galvanized steel pipe has two types: hot dip galvanized pipe with thicken zinc layer and electrical-galvanized pipe with low cost.
Metric system welded tube: The metric system welded tube is made from the common carbon steel, quality carbon steel or low alloy steel with the hot and cold welding or after hot welded by the cold again. The specification adopts the seamless steel pipe form with outside diameter*wall thickness (mm). The common metric system welded tube is usually used as structural elements like axis of rotation or transporting the fluid etc. The thin-walled tube is utilized for processing furniture, lamps and lanterns. But the manufacturers need to guarantee the strength and bending of steel pipe in the processing.
Spiral welded pipe: The spiral welded tube uses low carbon structural steel or low alloy structural steel strip according to certain helix angle (forming angle) rolled into a tube billet, then welded the pipe joints to be made. The spiral welded tube can use narrow strip steel to produce large diameter steel pipe. It is broadly applied as oil or natural gas pipeline. Moreover, spiral welded pipe has one side welding and double sided welding.
Seamless stainless steel tube for high temperature applications
Seamless stainless steel pipes are the preferred choice for high-temperature applications across industries due to their several superior properties. They possess greater strength under loading, exhibit exceptional corrosion resistance, can withstand shocks and vibrations, and offer reliable performance even under the toughest and harsh conditions. Due to these benefits, seamless stainless steel tubes and pipes are used in heating-pipelines, containers, coal-saving devices, super-heaters and repeaters, high press boiler, heat exchanger and condenser tubes, mechanical and structural tubing, among several others. This post discusses the various material grades of stainless steel used for producing these seamless pipes and tubes.
Grades of Stainless Steel Used in Producing Seamless Tubes and Pipes
Steel tubes and pipes used for the high-temperature applications must be of superior quality to resist high temperatures ranging from 400 degree Celsius to 1100 degree Celsius. For this reason, manufacturers use the following grades of stainless steel to fabricate seamless tubes and pipes.
304/304L: Oxidation resistance up to 1650°F, non- hardenable, and non-magnetic.
316/316L: Excellent tensile strength at elevated temperatures, exceptional creep and stress-rupture strength, and improved corrosion resistance.
310S: Exceptional resistance to oxidation under constant temperatures to 2000°F, better creep strength at elevated temperatures, impeccable strength, and toughness at cryogenic temperatures.
317L: Good resistance to chemical attack, higher creep resistance, excellent tensile strength at elevated temperatures, resistance to pitting and crevice corrosion.
321/321H: Excellent resistance to intergranular corrosion, can withstand continuous exposure to the temperature between 800-1500 degree F, and higher creep and stress rupture properties.
410: Good strength and hardness, excellent toughness in the hardened and tempered condition, resists oxidation up to 1292°F (700°C) continuously, and up to 1500°F (816°C) on an intermittent basis.
Due to all these advantages, the seamless stainless steel tubes and pipes manufactured from the aforementioned grades find immense applications in aerospace, oil and gas, manufacturing, marine, food processing, nuclear, chemical, military, paper and pulp, and pharmaceutical industries.
Grades of Stainless Steel Used in Producing Seamless Tubes and Pipes
Steel tubes and pipes used for the high-temperature applications must be of superior quality to resist high temperatures ranging from 400 degree Celsius to 1100 degree Celsius. For this reason, manufacturers use the following grades of stainless steel to fabricate seamless tubes and pipes.
304/304L: Oxidation resistance up to 1650°F, non- hardenable, and non-magnetic.
316/316L: Excellent tensile strength at elevated temperatures, exceptional creep and stress-rupture strength, and improved corrosion resistance.
310S: Exceptional resistance to oxidation under constant temperatures to 2000°F, better creep strength at elevated temperatures, impeccable strength, and toughness at cryogenic temperatures.
317L: Good resistance to chemical attack, higher creep resistance, excellent tensile strength at elevated temperatures, resistance to pitting and crevice corrosion.
321/321H: Excellent resistance to intergranular corrosion, can withstand continuous exposure to the temperature between 800-1500 degree F, and higher creep and stress rupture properties.
410: Good strength and hardness, excellent toughness in the hardened and tempered condition, resists oxidation up to 1292°F (700°C) continuously, and up to 1500°F (816°C) on an intermittent basis.
Due to all these advantages, the seamless stainless steel tubes and pipes manufactured from the aforementioned grades find immense applications in aerospace, oil and gas, manufacturing, marine, food processing, nuclear, chemical, military, paper and pulp, and pharmaceutical industries.
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