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.
Non-destructive testing of seamless steel pipe
Under the premise of not damaging the specimen, NDT refers to carry out inspection and testing to internal and surface structure, properties, status of specimen with physical or chemical methods, advanced technology and equipment. The development of non destructive testing technology has experienced three stages: Nondestructive detection, nondestructive testing and nondestructive evaluation.
Nondestructive detection is the name of the early stage, and the meaning is to detect and detect defects; Nondestructive testing is the name of the current stage, its meaning is not only to detect defects, but also to detect some other information, such as the structure, nature, status, etc.; And nondestructive evaluation (NDE) is one which is entered or is entering a new stage, it requires not only the defects are found, but also detection test pieces of the structure, properties, status, and access more comprehensive and more accurate, comprehensive information, such as defects associated with the shape, size, location, orientation, inclusions, tissue defect, residual stress force of information. It is necessary to combined with imaging technology, automation technology, and computer data analysis and processing technology, and mechanics of materials, and other fields of knowledge, and gives a comprehensive and accurate evaluation of the quality and performance of the test piece or product.
2018年10月25日星期四
Hot Rolling Treatment and Cold Stretching Treatment
After hot rolling or casting, the steel is no longer specialized for heat treatment and deliver directly after cooling, that is called hot rolling treatment. The terminal temperature of hot rolled is generally 800 to 900 degrees Celsius. After that, steel is generally cooling in the air, thus the state is equivalent to normalizing treatment. Due to the terminal temperature is high or low, different from normalizing heating temperature controlled strictly, The fluctuation of steel with hot rolling is greater than normalizing treatment on structure and properties.
The surface of steel with hot rolling is covered with a layer of iron oxide, which has a certain corrosion resistance. Therefore, requirements of storage and transportation is less strict than that of cold stretching and large and medium steel plate can be stored in the open yard.
Hot rolling treatment and cold stretching treatment
The steel, which is through cold stretching, without any heat treatment and direct delivery, is known as cold stretching. Compared with the state of hot rolled, cold stretching steel has high precision, good surface quality and higher mechanical properties. Due to the surface of steel with cold stretching is without oxide layer covered, and there are a lot of internal stress, it is extremely easy to suffer corrosion or rust. As a result, the packaging and storage of steel with cold stretching have strict requirements. It’s generally to be kept in the warehouse and the warehouse temperature and humidity should be pay attention.
The surface of steel with hot rolling is covered with a layer of iron oxide, which has a certain corrosion resistance. Therefore, requirements of storage and transportation is less strict than that of cold stretching and large and medium steel plate can be stored in the open yard.
Hot rolling treatment and cold stretching treatment
The steel, which is through cold stretching, without any heat treatment and direct delivery, is known as cold stretching. Compared with the state of hot rolled, cold stretching steel has high precision, good surface quality and higher mechanical properties. Due to the surface of steel with cold stretching is without oxide layer covered, and there are a lot of internal stress, it is extremely easy to suffer corrosion or rust. As a result, the packaging and storage of steel with cold stretching have strict requirements. It’s generally to be kept in the warehouse and the warehouse temperature and humidity should be pay attention.
The Application Range of LSAW Steel Pipe
LSAW (LSAW-Longitudinal Submerged Arc Welded) was invented in 1940, a new welding method, welding hand in front of it and the same place it is to protect the use of slag, but this residue is not a skin electrode medicine . Straight seam double submerged arc welding and manual welding the same place it is to protect the use of slag, but this residue is not a skin electrode medicine, is dedicated melting out of the welding flux. The welding system consists of a funnel drug loading of the welding flux through a pipeline to be welded to the front. The second difference is the use of welding, using wire, because the wire can be continuously sent; electrode, we gotta burn a welding electrode head and gave a throw, and the operation was stopped, for welding and then welded.
The application range :
LSAW steel pipe diameter in the range between 406 ~ 1600mm, in exceptional cases even more, the ratio of wall thickness and diameter of about 0.06 to 0.08. Modern foreign technology can produce pipe up to 100mm wall thickness of pipe.
Industrial production of steel plate or straight seam steel pipe only a few ways, the principle difference is the method of forming steel pipe, steel pipe after forming the follow-up process is basically the same. Methodological principles of forming the weld depends on the distribution of steel, according to the distribution of the pipes to weld two basic forms: straight seam and spiral seam steel pipe. Corresponding to this, straight seam welded pipe production into the production and the production of spiral seam pipe. Straight seam and spiral seam steel pipe the most widely used method is submerged arc welding (SAW), its good quality, high productivity, technology is mature and stable. Currently, straight seam steel pipe widely used abroad following range: air land and sea transport, water and oil trunk pipelines; transport chemicals and chemical products of stainless steel tube; marine industrial structure with a tube; boiler manufacturing and special purpose pipe structural tube.
The application range :
LSAW steel pipe diameter in the range between 406 ~ 1600mm, in exceptional cases even more, the ratio of wall thickness and diameter of about 0.06 to 0.08. Modern foreign technology can produce pipe up to 100mm wall thickness of pipe.
Industrial production of steel plate or straight seam steel pipe only a few ways, the principle difference is the method of forming steel pipe, steel pipe after forming the follow-up process is basically the same. Methodological principles of forming the weld depends on the distribution of steel, according to the distribution of the pipes to weld two basic forms: straight seam and spiral seam steel pipe. Corresponding to this, straight seam welded pipe production into the production and the production of spiral seam pipe. Straight seam and spiral seam steel pipe the most widely used method is submerged arc welding (SAW), its good quality, high productivity, technology is mature and stable. Currently, straight seam steel pipe widely used abroad following range: air land and sea transport, water and oil trunk pipelines; transport chemicals and chemical products of stainless steel tube; marine industrial structure with a tube; boiler manufacturing and special purpose pipe structural tube.
Quality control method of LSAW steel pipe
Large diameter LSAW steel pipe with its large wall thickness, good material, processing technology and stability, has become the first choice of steel large oil and gas transmission project at present at home and abroad. LSAW steel pipe in large diameter welded joints, the weld and heat affected zone is the most easy to produce all kinds of defects, and welding undercut, porosity, slag inclusion, incomplete fusion, lack of penetration, overip, burn, welding crack is the main form of welding defects, it is often the origin of the LSAW steel pipe the quality accident.
Quality control measures:
1. 1) before the welding quality control to quality first good raw materials, can be officially entered the construction site after passing inspection, and resolutely put an end to the use of substandard steel.
2) followed by the management of welding materials. Check whether the welding materials for qualified products, storage and baking system is executed, issued by the welding material surface is clean without rust, the electrode is intact, there is no mildew.
3) again is the welding area clean management. Check the welding area clean quality, no water, oil, rust and other dirt film, which plays an important role in avoiding weld external defects.
4) select the appropriate welding methods, welding principle should be applied, after the implementation of welding test.
2. 1) quality control in welding according to welding procedure review of welding wire and flux specifications are correct, to prevent misuse of wire and flux caused by welding quality accident.
2) to supervise the welding environment, welding environment is not good (when the temperature is below 0 DEG C, the relative humidity is greater than 90%) to take corresponding measures after welding at.
3) to test the pre groove size before welding, including clearance, edge, angle and the wrong port meets the technical requirements.
4) used in the welding process and automatic submerged arc welding current, welding voltage, welding speed and other parameters are correct.
5) supervision personnel in the submerged arc welding automatic welding and make full use of the pipe end arc plate length, and enhance the efficiency of the use of welding arc plate, which helps to improve the welding quality of tube end.
6) personnel in the supervision of welding repair welding is clean, whether the first slag has been completely processing joint, whether there is oil, rust, slag, water, paint and dirt groove.
Quality control measures:
1. 1) before the welding quality control to quality first good raw materials, can be officially entered the construction site after passing inspection, and resolutely put an end to the use of substandard steel.
2) followed by the management of welding materials. Check whether the welding materials for qualified products, storage and baking system is executed, issued by the welding material surface is clean without rust, the electrode is intact, there is no mildew.
3) again is the welding area clean management. Check the welding area clean quality, no water, oil, rust and other dirt film, which plays an important role in avoiding weld external defects.
4) select the appropriate welding methods, welding principle should be applied, after the implementation of welding test.
2. 1) quality control in welding according to welding procedure review of welding wire and flux specifications are correct, to prevent misuse of wire and flux caused by welding quality accident.
2) to supervise the welding environment, welding environment is not good (when the temperature is below 0 DEG C, the relative humidity is greater than 90%) to take corresponding measures after welding at.
3) to test the pre groove size before welding, including clearance, edge, angle and the wrong port meets the technical requirements.
4) used in the welding process and automatic submerged arc welding current, welding voltage, welding speed and other parameters are correct.
5) supervision personnel in the submerged arc welding automatic welding and make full use of the pipe end arc plate length, and enhance the efficiency of the use of welding arc plate, which helps to improve the welding quality of tube end.
6) personnel in the supervision of welding repair welding is clean, whether the first slag has been completely processing joint, whether there is oil, rust, slag, water, paint and dirt groove.
The Difference Between Galvanized Pipe And Seamless Pipe
Hot-dip galvanized steel pipe: reacts a molten metal with an iron matrix to produce an alloy layer, thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is washed by ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then fed. Hot dip plating tank.
Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. The complex physical and chemical anti-galvanized steel pipe of the hot-dip galvanized steel pipe base and the molten plating solution shall form a corrosion-resistant structure of a zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe base. Therefore, its corrosion resistance is strong.
Hot-dip galvanized seamless steel pipe: the galvanizing amount is very small, only 10-50g/m2, and its corrosion resistance is much worse than that of hot-dip galvanized pipe. Regular galvanized pipe manufacturers use quenched galvanized pipes as water and gas pipes. The galvanized layer of the cold-galvanized steel pipe is an electroplated layer, and the zinc layer and the steel pipe matrix are independently layered. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe base and is easy to fall off. Therefore, its corrosion resistance is poor. In newly built houses, the use of cold-galvanized steel pipes as water supply pipes is prohibited.
The difference between galvanized pipe and seamless pipe:
1. Efficient and environmentally friendly, non-toxic, non-polluting, non-corrosive, not only has the function of pickling, corrosion and fog suppression, but also has the effect of derusting and high-efficiency degreasing. It does not produce toxic or harmful substances during use, which reduces air pollution, is beneficial to the health of operators and improves the working environment of the workshop.
The existing pickling process has large consumption of hydrochloric acid, large acid mist, and short waste acid discharge cycle, and the product can be recycled after being added in a small amount during use, and can be used in the acid during use. Most of the ferrous chloride is converted into iron oxide and precipitated, which greatly prolongs the discharge cycle of the waste liquid.
2. There is no “over-etching” and “rust embrittlement” in the process of derusting. There is no “weight loss” phenomenon when steel materials are immersed for a long time.
3. Strong derusting ability, good effect, fast speed (descaling speed can be adjusted according to needs) General floating rust can be removed in about 5 minutes, significantly better than the current pickling process.
4. The workpiece after descaling with this product has a strong rust-removing adhesion to the zinc layer during galvanizing. The finish is good, and it is obviously superior to the pure hydrochloric acid pickled workpiece.
5. The cost of descaling is lower than the cost of existing pickling (the product can be extended for more than four times after adding this product in the acid solution).
6. The derusting speed can be adjusted in the range of 1min-60min. Generally, the floating rust can be removed within 3 minutes, and the heavy rust can be removed within 30 minutes. Depending on the size of the steel surface, the degree of corrosion and the number of steel grades, the rust of 20-100 tons of material can be removed per ton of rust removal liquid.
http://www.xysteelpipe.com/info/The-Difference-Between-Galvanized-Pipe-And-Seamless-Pipe-1307-1.htm
Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. The complex physical and chemical anti-galvanized steel pipe of the hot-dip galvanized steel pipe base and the molten plating solution shall form a corrosion-resistant structure of a zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe base. Therefore, its corrosion resistance is strong.
Hot-dip galvanized seamless steel pipe: the galvanizing amount is very small, only 10-50g/m2, and its corrosion resistance is much worse than that of hot-dip galvanized pipe. Regular galvanized pipe manufacturers use quenched galvanized pipes as water and gas pipes. The galvanized layer of the cold-galvanized steel pipe is an electroplated layer, and the zinc layer and the steel pipe matrix are independently layered. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe base and is easy to fall off. Therefore, its corrosion resistance is poor. In newly built houses, the use of cold-galvanized steel pipes as water supply pipes is prohibited.
The difference between galvanized pipe and seamless pipe:
1. Efficient and environmentally friendly, non-toxic, non-polluting, non-corrosive, not only has the function of pickling, corrosion and fog suppression, but also has the effect of derusting and high-efficiency degreasing. It does not produce toxic or harmful substances during use, which reduces air pollution, is beneficial to the health of operators and improves the working environment of the workshop.
The existing pickling process has large consumption of hydrochloric acid, large acid mist, and short waste acid discharge cycle, and the product can be recycled after being added in a small amount during use, and can be used in the acid during use. Most of the ferrous chloride is converted into iron oxide and precipitated, which greatly prolongs the discharge cycle of the waste liquid.
2. There is no “over-etching” and “rust embrittlement” in the process of derusting. There is no “weight loss” phenomenon when steel materials are immersed for a long time.
3. Strong derusting ability, good effect, fast speed (descaling speed can be adjusted according to needs) General floating rust can be removed in about 5 minutes, significantly better than the current pickling process.
4. The workpiece after descaling with this product has a strong rust-removing adhesion to the zinc layer during galvanizing. The finish is good, and it is obviously superior to the pure hydrochloric acid pickled workpiece.
5. The cost of descaling is lower than the cost of existing pickling (the product can be extended for more than four times after adding this product in the acid solution).
6. The derusting speed can be adjusted in the range of 1min-60min. Generally, the floating rust can be removed within 3 minutes, and the heavy rust can be removed within 30 minutes. Depending on the size of the steel surface, the degree of corrosion and the number of steel grades, the rust of 20-100 tons of material can be removed per ton of rust removal liquid.
http://www.xysteelpipe.com/info/The-Difference-Between-Galvanized-Pipe-And-Seamless-Pipe-1307-1.htm
2018年10月16日星期二
How Is The Crack On The Surface Of The Seamless Steel Pipe?
The cleanliness and smoothness of the surface of the seamless steel pipe is a requirement for the selection of a seamless steel pipe. The cleanliness of the surface of the seamless steel pipe has become a key point for the customer to choose. In recent years, it has been valued by many companies. Cracks on the surface of seamless steel pipes are a common phenomenon and a direct cause of low sales. So what are the factors?
First, the raw material factors: the poor quality of the tube blank will appear inside and outside the skin, crusting, cracks, etc.
Second, the temperature factor: the first important process of seamless steel pipe production is heating, poor heating (uneven, insufficient temperature, etc.) will cause internal skin, etc.
Third, the equipment factor: from the beginning of the furnace, each equipment component will affect the final quality of the pipe. For example, if the equipment parts are scratched, it will cause the outer skin and pits; if the punching machine is not smooth, the head of the tube blank will be bitten by water and bite into the head or the inside of the head.
Fourth, the process problem: the process problem is also quite complicated, there are adjustment problems, problems with equipment failure, and the quality of the pipe produced after the wear of the process components (head, guide, rolls, etc.). The problems caused are all-encompassing.
Therefore, there are dozens of possible reasons for the occurrence of a defect. If you do not see the physical object or are not at the production site, it is often difficult to say the specific reasons.
http://www.xysteelpipe.com/info/How-Is-The-Crack-On-The-Surface-Of-The-Seamless-Steel-Pipe-1300-1.htm
First, the raw material factors: the poor quality of the tube blank will appear inside and outside the skin, crusting, cracks, etc.
Second, the temperature factor: the first important process of seamless steel pipe production is heating, poor heating (uneven, insufficient temperature, etc.) will cause internal skin, etc.
Third, the equipment factor: from the beginning of the furnace, each equipment component will affect the final quality of the pipe. For example, if the equipment parts are scratched, it will cause the outer skin and pits; if the punching machine is not smooth, the head of the tube blank will be bitten by water and bite into the head or the inside of the head.
Fourth, the process problem: the process problem is also quite complicated, there are adjustment problems, problems with equipment failure, and the quality of the pipe produced after the wear of the process components (head, guide, rolls, etc.). The problems caused are all-encompassing.
Therefore, there are dozens of possible reasons for the occurrence of a defect. If you do not see the physical object or are not at the production site, it is often difficult to say the specific reasons.
http://www.xysteelpipe.com/info/How-Is-The-Crack-On-The-Surface-Of-The-Seamless-Steel-Pipe-1300-1.htm
2018年10月15日星期一
Advantages of precision seamless steel pipe
1. Precision seamless steel pipe is light weight, high strength, easy for transportation and installation. It is only 1/4 of steel, but the circumferential tensile strength is 180 - 300MPa and the axial tensile strength is 60 - 15OMPa, which is similar to alloy steel. Therefore, the strength is 2 to 3 times of gold steel. So that it can meet different requirements of users, designed to various types of pipeline to withstand internal and external pressure. Precision seamless steel pipe is 12 meters per section, it is easy to install which reduce the cost of lifting and improve the installation speed.
2. Anti-fouling and anti-boring. Precision seamless steel pipe will not be affected by sewage, fungi and other microbial station fester, reduce maintenance costs. Without these pollution, precision seamless steel pipe can be used for a long time. Due to its smooth wall and excellent corrosion resistance, it will not produce scale and microbial, effectively ensure water quality.
3. Good heat resistance, good frost resistance. Below -30 degrees, precision seamless steel pipe still has good toughness and high strength, can be used at the range of 50 ℃ - 80 ℃.
4. Good corrosion resistance. Precision seamless steel pipes can resist acid, alkali, salt, sea water, untreated sewage, corrosive soil or groundwater and erosion of many chemical fluids. Compared to traditional pipes, it generally lasts more than 50 years, which is used in municipal, urban transmission and distribution network. Because precision seamless steel pipe is non-toxic, no rust, tasteless, no secondary pollution to water, no corrosion, they are widely used for drainage industry.
2. Anti-fouling and anti-boring. Precision seamless steel pipe will not be affected by sewage, fungi and other microbial station fester, reduce maintenance costs. Without these pollution, precision seamless steel pipe can be used for a long time. Due to its smooth wall and excellent corrosion resistance, it will not produce scale and microbial, effectively ensure water quality.
3. Good heat resistance, good frost resistance. Below -30 degrees, precision seamless steel pipe still has good toughness and high strength, can be used at the range of 50 ℃ - 80 ℃.
4. Good corrosion resistance. Precision seamless steel pipes can resist acid, alkali, salt, sea water, untreated sewage, corrosive soil or groundwater and erosion of many chemical fluids. Compared to traditional pipes, it generally lasts more than 50 years, which is used in municipal, urban transmission and distribution network. Because precision seamless steel pipe is non-toxic, no rust, tasteless, no secondary pollution to water, no corrosion, they are widely used for drainage industry.
Treatment Technology of Stainless Seamless Steel Pipe
Stainless seamless steel pipes treatment technology refers to the processing of achieving uniform silver, and has a metallic luster. This is generally referred to the production of large stainless seamless steel pipes. Because large stainless seamless steel pipe is manufactured through stamping, folding and welding process, the surface of workpiece has oil, rust, macular, which is neither beautiful, and easy to rust, reducing its stainless steel quality and value.
To make stainless seamless steel pipes achieve the standard, the surface must be finished. After forming matte treatment, that can achieve beautiful appearance, but also improve its anti-corrosion and anti-discoloration performance. After the above method, the corrosion resistance of stainless seamless steel pipes can be increased by 2 to 3 times.
Stainless seamless steel pipes does not rust due to the existence of chromium, nickel components, and then through the matt treatment, not only can eliminate the matrix impurities and iron-rich layer, but also can make chromium on the surface, forming a complete purification film, play a better anti-corrosion effect. According to the complexity of stainless seamless steel pipes and user requirements, we can choose different processing technology, such as mechanical polishing, chemical polishing, electro chemical polishing and other methods to achieve specular gloss.
To make stainless seamless steel pipes achieve the standard, the surface must be finished. After forming matte treatment, that can achieve beautiful appearance, but also improve its anti-corrosion and anti-discoloration performance. After the above method, the corrosion resistance of stainless seamless steel pipes can be increased by 2 to 3 times.
Stainless seamless steel pipes does not rust due to the existence of chromium, nickel components, and then through the matt treatment, not only can eliminate the matrix impurities and iron-rich layer, but also can make chromium on the surface, forming a complete purification film, play a better anti-corrosion effect. According to the complexity of stainless seamless steel pipes and user requirements, we can choose different processing technology, such as mechanical polishing, chemical polishing, electro chemical polishing and other methods to achieve specular gloss.
Welded Steel Pipe for Low Pressure Fluid
Welded steel pipe for low pressure fluid (GB/T3092-1993), also known as general welded pipe, commonly known as the clarined,which used for conveying water, gas, air, oil and steam heating and other general low pressure fluid. steel pipe can be divided into ordinary steel pipe and thicken steel pipe according to the wall thickness. Specifications of steel pipe with nominal diameter (mm) that the nominal diameter is the diameter of the approximation. Customarily used in inches. Welded steel pipe for low pressure fluid directly is used for conveying fluids, but also a lot for low-pressure fluid the original tube of galvanized steel pipes.
Galvanized welded steel pipe for low pressure fluid (GB/T3091-1993), also known as galvanized welded steel pipe, commonly known as white tube, which is used for conveying water, gas, air, oil and steam heating, warm water and other fluids, or other general purpose low-pressure hot-dip galvanized welding (soldering or welding furnace) steel pipe. steel pipe can be divided into ordinary galvanized steel pipe and thicken galvanized steel pipe according to the wall thickness,and according to the pipe form,it be divided into without threaded galvanized steel pipe and threaded galvanized steel pipe. Specifications of steel pipe with nominal diameter (mm) that the nominal diameter is the diameter of the approximation. Customarily used in inches.
General low-frequency fluid transport with spiral seam welded steel pipe (SY5039-83) is a hot-rolled steel strip for the tube volume, temperature often spiral shape, high frequency welding lap welding method for general low pressure liquid delivery Spiral high-frequency welded steel pipe.
General low pressure liquid delivery spiral submerged arc welded pipe (SY5037-83) is a hot-rolled steel strip for the tube volume, temperature often spiral shape, using single-sided or double-sided automatic submerged arc welding method as for water , gas, air and steam is generally low pressure liquid delivery such as submerged arc welding steel pipes.
Galvanized welded steel pipe for low pressure fluid (GB/T3091-1993), also known as galvanized welded steel pipe, commonly known as white tube, which is used for conveying water, gas, air, oil and steam heating, warm water and other fluids, or other general purpose low-pressure hot-dip galvanized welding (soldering or welding furnace) steel pipe. steel pipe can be divided into ordinary galvanized steel pipe and thicken galvanized steel pipe according to the wall thickness,and according to the pipe form,it be divided into without threaded galvanized steel pipe and threaded galvanized steel pipe. Specifications of steel pipe with nominal diameter (mm) that the nominal diameter is the diameter of the approximation. Customarily used in inches.
General low-frequency fluid transport with spiral seam welded steel pipe (SY5039-83) is a hot-rolled steel strip for the tube volume, temperature often spiral shape, high frequency welding lap welding method for general low pressure liquid delivery Spiral high-frequency welded steel pipe.
General low pressure liquid delivery spiral submerged arc welded pipe (SY5037-83) is a hot-rolled steel strip for the tube volume, temperature often spiral shape, using single-sided or double-sided automatic submerged arc welding method as for water , gas, air and steam is generally low pressure liquid delivery such as submerged arc welding steel pipes.
Hot rolled seamless tube of what kind of billet
The birth of the seamless steel pipe is very important for the transportation of gas and oils between the two locations. However, not all pipes can be used for the hot-rolled seamless tube. Then, how could we choose from them?
Concerned about the steel pipe’s categories, functions and piercing methods, we will have strict demands on pipe billet for hot-rolled seamless tube.
First of all, stress conditions would be an important factor for us. Better or lesser amount of deformation perforation method, without affecting pipe performance conditions, the tube surface and internal quality requirements may be slightly lower.
Then, the stress disadvantaged two-roll rotary piercing, if a large amount of deformation perforation, then the tube surface and internal quality have strict requirements.
Of course, we should make sure the high quality of the technical condition. As it would guarantee the production process as the basis for steel pipe’s production.
http://www.xysteelpipe.com/info/Hot-rolled-seamless-tube-of-what-kind-of-billet-1299-1.htm
Concerned about the steel pipe’s categories, functions and piercing methods, we will have strict demands on pipe billet for hot-rolled seamless tube.
First of all, stress conditions would be an important factor for us. Better or lesser amount of deformation perforation method, without affecting pipe performance conditions, the tube surface and internal quality requirements may be slightly lower.
Then, the stress disadvantaged two-roll rotary piercing, if a large amount of deformation perforation, then the tube surface and internal quality have strict requirements.
Of course, we should make sure the high quality of the technical condition. As it would guarantee the production process as the basis for steel pipe’s production.
http://www.xysteelpipe.com/info/Hot-rolled-seamless-tube-of-what-kind-of-billet-1299-1.htm
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