1. Submerged Arc Welding Process Difference.
Compared with spiral submerged arc welding process, longitudinal submerged arc welding process can inevitably have a lot of T-weld, so the existence of welding defects has great increased. The welding residual T-welds stress is large, and the weld metal are often in three-dimensional stress state which can increase the likelihood of cracks. Besides, according to the provisions of submerged arc welding process, each weld shall have the arc at the place and extinction. However, in each longitudinal submerged arc welding ring, it is unable to meet the conditions which causes more weld defects during longitudinal submerged arc welding process.
2. Production Range Difference
Under the same operating pressure to produce the same outside diameter longitudinal weld pipe and spiral weld pipe, spiral weld pipe can produce thinner wall thickness pipe than longitudinal weld pipe. Because when the pressure in the pipe to withstand, it typically produces two main stress on the pipe wall. These two main stress are radial stress and axial stress. On spiral weld pipe, these two main stress are divided by the helix angle of the weld, therefore synthetic spiral weld stresses are the main stress.
3. The Hydro Static Burst Strength
The yield stress and burst pressure on spiral weld pipe is lower than the longitudinal weld pipe, even though there are certain relevant comparison test has says the yield pressure and burst pressure measured and theoretical values are basic the same on spiral and longitudinal weld pipe. In the blasting test, it also proved that the hoop blasting mouth deformation rate for spiral weld pipe is significantly greater than the longitudinal weld pipe. It confirmed that spiral weld pipe has a greater plastic deformation than longitudinal weld pipe.
4. Toughness Difference
Compared with the same specification spiral weld pipe and longitudinal weld pipe, spiral weld pipe has a higher impact of toughness. With the increasing needs for large diameter pipe with high strength and with the development of new steel grades, It requires greater ductile fracture tip.
5. Fatigue Strength Difference
With the same test data in the same area, under the same pipe distribution and resistance, longitudinal submerged arc weld pipe has a higher level of fatigue strength. Because of the transfer pipeline output volume changes, in the actual operation, the pipe is subjected to random alternating loads of action. It is very significant to judge the life of pipeline by learning the cycle fatigue strength of steel.
2019年9月29日星期日
ERW steel tube vs UOE steel tube
ERW Steel Pipe is different from UOE Steel Pipe, the difference are as follows:
1. The Raw Materials and Production Capacity Difference
The material for producing ERW Steel Pipe is hot-rolled coil or strips, while for producing UOE Steel Pipe we use hot-rolled steel. Therefore, ERW Steel Pipe can achieve a continuous pipeline operations, high production efficiency, low production costs. For UOE Steel Pipe, it can not achieve a continuous pipeline operations, low productivity, high production cost. The maximum thickness for ERW Steel Pipe can reach 25mm, and the maximum outside diameter for ERW Steel Pipe can achieve 660mm. However, the maximum wall thickness for UOE Steel Pipe is 40mm, and the maximum production outside diameter is limited by the width of the steel sheet, in current day, the maximum production outside diameter for UOE Steel Pipe is 1422mm.
2. Welding Difference
Compared with UOE Steel Pipe, one of the advantages of ERW Steel Pipe is that there is no need to have additional wire during the welding process.
3. Appearance Difference
During the production process, ERW Steel Pipe requires inside and outside welds remove, so it has a anti-corrosive advantages compared with UOE Steel Pipe.
4. Application Difference
ERW Steel Pipe is mainly applied in natural gas, refined oil, crude oil, pulp and other terrestrial long-distance pipelines. UOE steel pipes are mainly used in high-voltage submarine long-distance pipelines, alpine area, land two/three/four types of areas.
1. The Raw Materials and Production Capacity Difference
The material for producing ERW Steel Pipe is hot-rolled coil or strips, while for producing UOE Steel Pipe we use hot-rolled steel. Therefore, ERW Steel Pipe can achieve a continuous pipeline operations, high production efficiency, low production costs. For UOE Steel Pipe, it can not achieve a continuous pipeline operations, low productivity, high production cost. The maximum thickness for ERW Steel Pipe can reach 25mm, and the maximum outside diameter for ERW Steel Pipe can achieve 660mm. However, the maximum wall thickness for UOE Steel Pipe is 40mm, and the maximum production outside diameter is limited by the width of the steel sheet, in current day, the maximum production outside diameter for UOE Steel Pipe is 1422mm.
2. Welding Difference
Compared with UOE Steel Pipe, one of the advantages of ERW Steel Pipe is that there is no need to have additional wire during the welding process.
3. Appearance Difference
During the production process, ERW Steel Pipe requires inside and outside welds remove, so it has a anti-corrosive advantages compared with UOE Steel Pipe.
4. Application Difference
ERW Steel Pipe is mainly applied in natural gas, refined oil, crude oil, pulp and other terrestrial long-distance pipelines. UOE steel pipes are mainly used in high-voltage submarine long-distance pipelines, alpine area, land two/three/four types of areas.
Manufacturers and suppliers of welded steel tubes
Tianjin Xinyue Steel Group as a welded steel pipe supplier in China, offering the best price of cold drawn welded pipe is our competitive advantages. we can offer all kinds of cold drawn welded pipe in stock.
The cold drawn welded steel pipe term is often used to describe special products from a processing technology of welded steel pipe. Cold drawn welded pipe has accurate specification, good concentration, uniform wall thickness, diameter and mechanical properties, good degree of hardness, resistance to bending and tensile properties, high standard of surface polishing and ensure the integrity of the welding. This kind of steel pipe still need further fine processing before using. Cold drawn welded steel pipe need to plaquette, then Individuation to shaft for drawing again. We can produce a variety of specifications of the finished tube by this way and may use several kinds of metal stamping and shaft during period.
Cold drawn welded(DOM) technology is mainly used for mass production of the pipe of mechanical equipment (such as the hydraulic system) and solid core rod with the diameter close to the ideal inner diameter. If you need cold drawn welded steel pipe, you can contact us at any time, we will provide you the best price of cold drawn welded pipe.
The cold drawn welded steel pipe term is often used to describe special products from a processing technology of welded steel pipe. Cold drawn welded pipe has accurate specification, good concentration, uniform wall thickness, diameter and mechanical properties, good degree of hardness, resistance to bending and tensile properties, high standard of surface polishing and ensure the integrity of the welding. This kind of steel pipe still need further fine processing before using. Cold drawn welded steel pipe need to plaquette, then Individuation to shaft for drawing again. We can produce a variety of specifications of the finished tube by this way and may use several kinds of metal stamping and shaft during period.
Cold drawn welded(DOM) technology is mainly used for mass production of the pipe of mechanical equipment (such as the hydraulic system) and solid core rod with the diameter close to the ideal inner diameter. If you need cold drawn welded steel pipe, you can contact us at any time, we will provide you the best price of cold drawn welded pipe.
2019年9月18日星期三
Fire protection measures of seamless steel tube
Seamless steel pipes usually lose their load carrying capacity at temperatures of 450 to 650 ° C, causing large deformations, resulting in bending of steel columns and steel beams. As a result, they cannot be used due to excessive deformation.The unfired seamless steel pipe has a fire resistance limit of about 15 minutes. The length of this time is also related to the speed at which the component absorbs heat. The fire protection measures for several different seamless steel pipes are described below.
1. The outer layer. It is to add an outer layer on the surface of the seamless steel pipe, which can be cast in place or sprayed. The cast-in-place solid concrete cladding is usually reinforced with steel mesh or steel to limit shrinkage cracks and to ensure the strength of the casing.
2. Fill the water. Filling the hollow seamless steel pipe is the most effective protection against fire. This method enables the seamless steel pipe to maintain a lower temperature in the fire, and the water circulates in the seamless steel pipe to absorb the heat of the material itself. The heated water can be recirculated after cooling, or cold water can be introduced from the pipeline to replace the heated water.
3. Shielding. The seamless steel pipe is placed in a wall or ceiling made of refractory material, or the component is hidden in the space between the two walls, and the fireproofing purpose can be achieved by adding a little refractory material or increasing it. This is the most economical way to fire.
At present, high-rise seamless steel pipe construction is increasing, especially for some super high-rise buildings, which use a wider range of seamless steel pipe materials. In the event of a fire accident in a high-rise building, the fire will not be extinguished in a short period of time. This requires us to increase the fire protection of the building materials during the design of the building to enhance its fire resistance and to develop the necessary emergency within the building. Program to reduce casualties and property damage.
http://www.xysteelpipe.com/info/Fire-protection-measures-of-seamless-steel-tube-1510-1.htm
1. The outer layer. It is to add an outer layer on the surface of the seamless steel pipe, which can be cast in place or sprayed. The cast-in-place solid concrete cladding is usually reinforced with steel mesh or steel to limit shrinkage cracks and to ensure the strength of the casing.
2. Fill the water. Filling the hollow seamless steel pipe is the most effective protection against fire. This method enables the seamless steel pipe to maintain a lower temperature in the fire, and the water circulates in the seamless steel pipe to absorb the heat of the material itself. The heated water can be recirculated after cooling, or cold water can be introduced from the pipeline to replace the heated water.
3. Shielding. The seamless steel pipe is placed in a wall or ceiling made of refractory material, or the component is hidden in the space between the two walls, and the fireproofing purpose can be achieved by adding a little refractory material or increasing it. This is the most economical way to fire.
At present, high-rise seamless steel pipe construction is increasing, especially for some super high-rise buildings, which use a wider range of seamless steel pipe materials. In the event of a fire accident in a high-rise building, the fire will not be extinguished in a short period of time. This requires us to increase the fire protection of the building materials during the design of the building to enhance its fire resistance and to develop the necessary emergency within the building. Program to reduce casualties and property damage.
http://www.xysteelpipe.com/info/Fire-protection-measures-of-seamless-steel-tube-1510-1.htm
2019年9月17日星期二
Hot Rolled Tube Seamless Steel Tube
Hot rolled seamless steel tube: hot rolling is related to the cold drawn, hot rolling is performed above the recrystallization temperature of the rolling.
Hot-rolled seamless steel tube advantages:
Ingot casting can destroy tissue, grain refinement of steel and eliminate defects microstructure, so that the steel dense tissue mechanical properties are improved. This improvement is mainly reflected in the direction along the rolling direction to a certain extent, the steel is no longer isotropic; pouring formed bubbles, cracks and loose, can be welded at a high temperature and pressure.
Hot-rolled seamless stee tube disadvantages:
1. After hot rolling, the steel inside the non-metallic inclusions (mainly sulphide and oxide, and silicates) is pressed into the sheet, delamination (interlayer) phenomenon. Layered in the thickness direction of the steel tension performance deteriorated significantly, and there may be an interlayer tear weld shrinkage. Weld local strain-induced contraction of the yield point strain often reach several times larger than the load caused by the strain;
2. Residual stresses caused by uneven cooling. Residual stresses in the absence of external force from the internal equilibrium of stress, both hot-rolled steel section such various residual stress, the greater the cross-sectional size generally of steel, the residual stress is larger. Although the residual stress from equilibrium, but still has some influence on the performance of the steel members under loads. Terms such as deformation, stability, anti-fatigue effects may adversely.
3. Hot-rolled steel products, poor control of the thickness and width of the edge in this respect. We are familiar with thermal expansion and contraction, since the beginning of the hot rolling out even the length, thickness are standard, and finally cooled or there will be some negative difference, this negative difference edge width wider, thicker the more obvious manifestations. So for large steel for steel edge width, thickness, length, angle, and no law requires very precise edges.
Hot-rolled seamless steel tube process:
Round tube perforation → heating → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage
Hot-rolled seamless steel tube advantages:
Ingot casting can destroy tissue, grain refinement of steel and eliminate defects microstructure, so that the steel dense tissue mechanical properties are improved. This improvement is mainly reflected in the direction along the rolling direction to a certain extent, the steel is no longer isotropic; pouring formed bubbles, cracks and loose, can be welded at a high temperature and pressure.
Hot-rolled seamless stee tube disadvantages:
1. After hot rolling, the steel inside the non-metallic inclusions (mainly sulphide and oxide, and silicates) is pressed into the sheet, delamination (interlayer) phenomenon. Layered in the thickness direction of the steel tension performance deteriorated significantly, and there may be an interlayer tear weld shrinkage. Weld local strain-induced contraction of the yield point strain often reach several times larger than the load caused by the strain;
2. Residual stresses caused by uneven cooling. Residual stresses in the absence of external force from the internal equilibrium of stress, both hot-rolled steel section such various residual stress, the greater the cross-sectional size generally of steel, the residual stress is larger. Although the residual stress from equilibrium, but still has some influence on the performance of the steel members under loads. Terms such as deformation, stability, anti-fatigue effects may adversely.
3. Hot-rolled steel products, poor control of the thickness and width of the edge in this respect. We are familiar with thermal expansion and contraction, since the beginning of the hot rolling out even the length, thickness are standard, and finally cooled or there will be some negative difference, this negative difference edge width wider, thicker the more obvious manifestations. So for large steel for steel edge width, thickness, length, angle, and no law requires very precise edges.
Hot-rolled seamless steel tube process:
Round tube perforation → heating → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage
Limitations of SSAW steel tube
SSAW steel pipe also has its own shortcomings, spiral steel hollow section is used as a large number of pipeline fluids, such as transportation of oil, natural gas, gas, water and some solid materials, pipes and so on. Compared to other steel and solid steel bar, the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle rack and construction using steel scaffolding.
Steel pipe manufacturing annular parts, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets, has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel would have to make steel. Pipe according to different cross-sectional shapes can be divided into tube and shaped tubes. Because in the perimeter of equal conditions, the largest area of a circle with a circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of pipe is pipe.
However, the tube also has some limitations, such as under the conditions by plane bending, tube as good as square, rectangular tube large flexural strength, the skeleton of some farm machinery, steel and wood furniture on the popular square, rectangular tube. According to different uses should also have other special-shaped pipe cross-sectional shape.
Steel pipe manufacturing annular parts, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets, has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel would have to make steel. Pipe according to different cross-sectional shapes can be divided into tube and shaped tubes. Because in the perimeter of equal conditions, the largest area of a circle with a circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of pipe is pipe.
However, the tube also has some limitations, such as under the conditions by plane bending, tube as good as square, rectangular tube large flexural strength, the skeleton of some farm machinery, steel and wood furniture on the popular square, rectangular tube. According to different uses should also have other special-shaped pipe cross-sectional shape.
Quality problem of LSAW steel tube
In the LSAW steel pipe production process, because the primary process is in a hot state, so the heating operation is resolution product quality is very important process.
The heat with the furnace, according to their results, and reheating furnace is divided into two kinds; the former is used to billet heated from room temperature to the processing temperature; the latter is used in the process in the blank reheated to the required processing temperature.
Heating will be wrong in the outer surface of the tube surface may exhibit cracks, folds and migraine pain and other waste reason.
Furnace There are many ways, but the primary use is a ring furnace. This furnace has an annular hearth, it can slowly change the direction of the diameter of the blank along the bottom of the load from the entrance, a reversal can be used at the outlet of the heating and soaking temperature to the rule kind of stove. This operation is the key blank is heated uniformly heated to a temperature suitable for processing. Because a great impact on the quality of the perforation, that is, when the temperature of the process piercing is an important condition affecting the quality, it is generally the temperature of the billet piercing working is to manipulate.
The heat with the furnace, according to their results, and reheating furnace is divided into two kinds; the former is used to billet heated from room temperature to the processing temperature; the latter is used in the process in the blank reheated to the required processing temperature.
Heating will be wrong in the outer surface of the tube surface may exhibit cracks, folds and migraine pain and other waste reason.
Furnace There are many ways, but the primary use is a ring furnace. This furnace has an annular hearth, it can slowly change the direction of the diameter of the blank along the bottom of the load from the entrance, a reversal can be used at the outlet of the heating and soaking temperature to the rule kind of stove. This operation is the key blank is heated uniformly heated to a temperature suitable for processing. Because a great impact on the quality of the perforation, that is, when the temperature of the process piercing is an important condition affecting the quality, it is generally the temperature of the billet piercing working is to manipulate.
Pipe Stud End VS Pipe Cap
The stud end and pipe cap look similar sometimes. Both of them are two common fittings used at the end of industrial steel pipes. In some cases, they are regarded as one thing, and most of the time they can replace each other, that has the same function with them is the blind flange. If there are no special operation on the pipeline, then pipe cap or plug directly welded to the pipeline, if considering the future pipeline transformation or disassembly convenience requirements, then the blind flange will play a role.
Steel Pipe Cap, a pipe fitting welded to a pipe end or mounted on the external thread to seal a pipe, acting as a pipe plug. Ranges from connection types, the steel cap can be divided: butt weld cap, socket weld cap, threaded cap. The stud head is used for blocking the internal thread of the pipe end or the external thread of the flange. There are square tube plug, hexagonal tube plug, round plug.
Both Stub and cap are made by the same material and used for same applications. They are widely used in the petroleum, chemical, power, gas, metallurgy, shipbuilding and construction industries and they are made from high quality raw materials like carbon steel, alloy steel, stainless steel and available in a variety of sizes and designs according to ASME/ANSI B16.9. Any needs, call for us today!
Steel Pipe Cap, a pipe fitting welded to a pipe end or mounted on the external thread to seal a pipe, acting as a pipe plug. Ranges from connection types, the steel cap can be divided: butt weld cap, socket weld cap, threaded cap. The stud head is used for blocking the internal thread of the pipe end or the external thread of the flange. There are square tube plug, hexagonal tube plug, round plug.
Both Stub and cap are made by the same material and used for same applications. They are widely used in the petroleum, chemical, power, gas, metallurgy, shipbuilding and construction industries and they are made from high quality raw materials like carbon steel, alloy steel, stainless steel and available in a variety of sizes and designs according to ASME/ANSI B16.9. Any needs, call for us today!
2019年9月8日星期日
Characteristics of Outer Thickened Oil Casing
The outer thickened oil casing adopts the round pipe thread of the taper pipe, and is thickened through the joint to complete the joint and seal. It is one of the basic thread buckle types issued by the Petroleum Association. Its tooth shape is triangular, dome round bottom, the tooth angle is 60°, the thread taper is 1:16, and the tooth angle bisector is perpendicular to the axis. When the thread is tightened, the inner and outer snails.The side of the tooth has an interference fit and seal, which has simple processing, sealing with thread grease, some connection strength, and easy care and application on site. So what are the characteristics of the outer thickened oil casing? Here we briefly understand:
1. The joint strength is strengthened by the joint upsetting.
Without changing the thread form, the joint is subjected to the upsetting process to increase the joint size, which increases the joint strength and meets the requirements of the lower depth.
2. After the cooperation with the threaded grease, there is a gap of 0.076mm between the top of the sealed outer thickened oil sleeve and the bottom of the tooth. When the thread is tightened, the gap between the top of the head is full of thread grease, and the thread leakage is blocked after the thread grease is solidified. Thereby completing the sealing effect.
Externally thickened oil casings have an indelible contribution to the history of the petroleum industry. Following the development of the petroleum industry, the geological conditions are getting sour, and the outer thickened oil casing threads are constantly upgraded, gradually adapting to the requirements of unique formations.
http://www.xysteelpipe.com/info/Characteristics-of-Outer-Thickened-Oil-Casing-1503-1.htm
1. The joint strength is strengthened by the joint upsetting.
Without changing the thread form, the joint is subjected to the upsetting process to increase the joint size, which increases the joint strength and meets the requirements of the lower depth.
2. After the cooperation with the threaded grease, there is a gap of 0.076mm between the top of the sealed outer thickened oil sleeve and the bottom of the tooth. When the thread is tightened, the gap between the top of the head is full of thread grease, and the thread leakage is blocked after the thread grease is solidified. Thereby completing the sealing effect.
Externally thickened oil casings have an indelible contribution to the history of the petroleum industry. Following the development of the petroleum industry, the geological conditions are getting sour, and the outer thickened oil casing threads are constantly upgraded, gradually adapting to the requirements of unique formations.
http://www.xysteelpipe.com/info/Characteristics-of-Outer-Thickened-Oil-Casing-1503-1.htm
How to carry on the high precision inspection to the tube end wall thickness
After the steel tube is finished, there will be defects such as uneven wall thickness at both ends of the tube. Therefore, each steel tube must be cut off at both ends. Since the length of the tube end where each tube has defects is not equal, it is difficult to determine the specific cut length at the time of excision. Therefore, it is necessary to measure the wall thickness of the device.
The specific requirements for testing are as follows:
1. Continuous detection, while detecting the edge feed. Each steel pipe takes no more than 30 seconds;
2. The length of the test steel pipe is not less than 500mm;
3. After detecting the qualified position, the test stops, and the obvious mark is made on the outer surface of the steel pipe;
4. The quality of the cut steel pipe is within the tolerance of the national standard of the steel pipe, and the precision is 0.02mm;
5. Separate marking for the presence of local high points;
6. For the alarm of the steel pipe that exceeds the set range, the on-site personnel decide whether to release it.
http://www.xysteelpipe.com/info/How-to-carry-on-the-high-precision-inspection-to-the-tube-end-wall-thickness-1502-1.htm
The specific requirements for testing are as follows:
1. Continuous detection, while detecting the edge feed. Each steel pipe takes no more than 30 seconds;
2. The length of the test steel pipe is not less than 500mm;
3. After detecting the qualified position, the test stops, and the obvious mark is made on the outer surface of the steel pipe;
4. The quality of the cut steel pipe is within the tolerance of the national standard of the steel pipe, and the precision is 0.02mm;
5. Separate marking for the presence of local high points;
6. For the alarm of the steel pipe that exceeds the set range, the on-site personnel decide whether to release it.
http://www.xysteelpipe.com/info/How-to-carry-on-the-high-precision-inspection-to-the-tube-end-wall-thickness-1502-1.htm
2019年9月6日星期五
Difference between Seamless and ERW Stainless steel pipe
Today, Prime Steel will discuss about the key difference between Seamless and ERW Stainless Steel Pipe
What is the Raw material required for manufacturing Seamless & ERW Stainless steel Pipes?
Seamless Steel Pipe is made from a solid round steel ‘billet’ which is heated and pushed or pulled over a form until the steel is shaped into a hollow tube.
What is the Difference Between Seamless and ERW Stainless Steel Pipes?
Electric Resistance Welding (ERW) pipe is manufactured by rolling metal and then welding it longitudinally across its length. Seamless pipe is manufactured by extruding the metal to the desired length; therefore ERW pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length.
In Seamless pipe, there are no welding or joints and is manufactured from solid round billets. The seamless pipe is finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 26 inch OD. Applicable in for High-pressure applications such as Hydrocarbon Industries & Refineries, Oil & Gas Exploration & Drilling, Oil & Gas Transportation and Air and Hydraulic cylinders, Bearings, Boilers, Automobiles etc.
ERW (Electric Resistance Welded) pipes are welded longitudinally, manufactured from Strip / Coil and can be manufactured upto 24” OD. ERW pipe cold formed from a ribbon of steel pulled through a series of rollers and formed into a tube which is fused through a electric charge. It is mainly used for low/ medium pressure applications such as transportation of water / oil.
What Technologies are used to manufacture Seamless & ERW Pipes?
Technologies for Production of Seamless & ERW Pipes “CPE” Technology” used for Seamless Pipes & Tubes Production up to 7-inches OD is the world renowned Technology. “Plug Mill” Technology used for Higher Dia. Seamless Pipes & Tubes Production from 7-inches to 14-inches,is the most reliable technology,in higher dia. Segment. High frequency Induction Welding Technology is used for ERW Pipes &Tubes upto 21-inchesOD.
How to Identify Seamless or ERW Stainless Steel pipes?
To identify that a pipe supplied is seamless or ERW, Simply read the stencil on the side of the pipe
If it is ASTM A53, Type S means seamless.
Type F is furnace but welded,
Type E is Electrical resist welded.
Thats how. It is the easiest way to identify wether pipe is seamless or ERW.
What is the Raw material required for manufacturing Seamless & ERW Stainless steel Pipes?
Seamless Steel Pipe is made from a solid round steel ‘billet’ which is heated and pushed or pulled over a form until the steel is shaped into a hollow tube.
What is the Difference Between Seamless and ERW Stainless Steel Pipes?
Electric Resistance Welding (ERW) pipe is manufactured by rolling metal and then welding it longitudinally across its length. Seamless pipe is manufactured by extruding the metal to the desired length; therefore ERW pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length.
In Seamless pipe, there are no welding or joints and is manufactured from solid round billets. The seamless pipe is finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 26 inch OD. Applicable in for High-pressure applications such as Hydrocarbon Industries & Refineries, Oil & Gas Exploration & Drilling, Oil & Gas Transportation and Air and Hydraulic cylinders, Bearings, Boilers, Automobiles etc.
ERW (Electric Resistance Welded) pipes are welded longitudinally, manufactured from Strip / Coil and can be manufactured upto 24” OD. ERW pipe cold formed from a ribbon of steel pulled through a series of rollers and formed into a tube which is fused through a electric charge. It is mainly used for low/ medium pressure applications such as transportation of water / oil.
What Technologies are used to manufacture Seamless & ERW Pipes?
Technologies for Production of Seamless & ERW Pipes “CPE” Technology” used for Seamless Pipes & Tubes Production up to 7-inches OD is the world renowned Technology. “Plug Mill” Technology used for Higher Dia. Seamless Pipes & Tubes Production from 7-inches to 14-inches,is the most reliable technology,in higher dia. Segment. High frequency Induction Welding Technology is used for ERW Pipes &Tubes upto 21-inchesOD.
How to Identify Seamless or ERW Stainless Steel pipes?
To identify that a pipe supplied is seamless or ERW, Simply read the stencil on the side of the pipe
If it is ASTM A53, Type S means seamless.
Type F is furnace but welded,
Type E is Electrical resist welded.
Thats how. It is the easiest way to identify wether pipe is seamless or ERW.
2019年9月5日星期四
Low,Medium and High Carbon Steel
The world of carbon steels can be challenging to wrap your head around. There are many different options to choose from, and each type of steel has different benefits. The main differentiating factor is the amount of carbon that is mixed with iron during production. Other materials, mainly metals, can be added to change the physical properties. Notably, chromium is added to form stainless steel, while other big picture, there are three distinctions between carbon steels: low, medium, and high.
Low carbon steel
Low carbon steels such as 302, 304 or 316 grades of stainless are typically used in applications which require high degrees of corrosion resistance but do not require a hardened surface. The carbon content of these steels typically range between 0.03-0.08%, and consumers typically use these grades of stainless (often without thinking about it) in kitchen equipment, silverware or almost any grade of un-plated steel used in food preparation. It’s great because it can survive the dishwasher without rusting, but it cannot be case hardened due to the very low carbon content.
While it can be used to make linear shafting, it isn’t suitable for loaded ball contact. So if a linear ball bushing were to be used on a soft 304 stainless steel shaft, for example, the balls in the bearing would quickly impact the shaft surface, resulting in visible ball tracking on its surface and a drastic reduction in both bearing and shaft life. It can, however, be used in conjunction with polymer, plain-style bearings which provide great options for both corrosion resistance and self-lubrication. For the right applications, a 300 series stainless steel linear shaft presents a great option for withstanding tough environmental conditions!
Medium carbon steel
Medium carbon steels include grades with carbon contents ranging from 0.25% to 0.60% of the steel mass. Medium carbon grades are typically employed in conjunction with alloys such as chromium, nickel and molybdenum to produce high strength, wear resistance and toughness. Products using medium grades of carbon steel include gears, axles, studs and other machine components that require optimal combinations of strength and toughness.
Medium carbon steels have good machining characteristics, and one of the more popular grades used in machined steel product is AISI 1045. AISI 1045 can also be hardened by heating the material too approximately 820-850C (1508 -1562 F) and held until the material reaches a uniform temperature. It should be soaked for one hour per 25 mm section of material and subsequently cooled in still air.
High carbon steel
High carbon steels are those with carbon contents between 0.60% and 1.4% of the overall weight. The alloys in this particular category constitute the strongest and hardest within the three groups, but they are also the least ductile. These steels are used in a range of different mechanical, cutting and bearing applications as it can be hardened through heat treating and tempering. Additional alloys can be added to this steel category in order to generate different characteristics. Chromium and Manganese, for example, are used in the composition of 52100 steel and aid in the hardening process while enhancing the steel’s resistance to corrosion. Since 52100 is one of the steel grades frequently used to manufacture linear shafting, precise control of the case depth can be critical to generate a shaft with both a hardened surface (for loaded ball contact) and an un-hardened inner core which prevents the shaft from becoming brittle.
Steel alloys are given designators by organizations such as the American Iron and Steel Institute (AISI) and the American Society for Testing and Materials (ASTM) for easier classification and identification. AISI typically follows a four digit system, where the first two digits indicate the alloy, and the second two digits denote the carbon content. ASTM uses an “A” to denote ferrous materials, followed by an arbitrarily assigned number for each alloy.
Regardless of the system used, this standardization allows cross talk between designers, engineers, and builders to ensure the proper material is being selected and used in engineering projects. It also makes looking up physical properties of alloys very easy, as a simple search with the identification number produces the correct information.
Low carbon steel
Low carbon steels such as 302, 304 or 316 grades of stainless are typically used in applications which require high degrees of corrosion resistance but do not require a hardened surface. The carbon content of these steels typically range between 0.03-0.08%, and consumers typically use these grades of stainless (often without thinking about it) in kitchen equipment, silverware or almost any grade of un-plated steel used in food preparation. It’s great because it can survive the dishwasher without rusting, but it cannot be case hardened due to the very low carbon content.
While it can be used to make linear shafting, it isn’t suitable for loaded ball contact. So if a linear ball bushing were to be used on a soft 304 stainless steel shaft, for example, the balls in the bearing would quickly impact the shaft surface, resulting in visible ball tracking on its surface and a drastic reduction in both bearing and shaft life. It can, however, be used in conjunction with polymer, plain-style bearings which provide great options for both corrosion resistance and self-lubrication. For the right applications, a 300 series stainless steel linear shaft presents a great option for withstanding tough environmental conditions!
Medium carbon steel
Medium carbon steels include grades with carbon contents ranging from 0.25% to 0.60% of the steel mass. Medium carbon grades are typically employed in conjunction with alloys such as chromium, nickel and molybdenum to produce high strength, wear resistance and toughness. Products using medium grades of carbon steel include gears, axles, studs and other machine components that require optimal combinations of strength and toughness.
Medium carbon steels have good machining characteristics, and one of the more popular grades used in machined steel product is AISI 1045. AISI 1045 can also be hardened by heating the material too approximately 820-850C (1508 -1562 F) and held until the material reaches a uniform temperature. It should be soaked for one hour per 25 mm section of material and subsequently cooled in still air.
High carbon steel
High carbon steels are those with carbon contents between 0.60% and 1.4% of the overall weight. The alloys in this particular category constitute the strongest and hardest within the three groups, but they are also the least ductile. These steels are used in a range of different mechanical, cutting and bearing applications as it can be hardened through heat treating and tempering. Additional alloys can be added to this steel category in order to generate different characteristics. Chromium and Manganese, for example, are used in the composition of 52100 steel and aid in the hardening process while enhancing the steel’s resistance to corrosion. Since 52100 is one of the steel grades frequently used to manufacture linear shafting, precise control of the case depth can be critical to generate a shaft with both a hardened surface (for loaded ball contact) and an un-hardened inner core which prevents the shaft from becoming brittle.
Steel alloys are given designators by organizations such as the American Iron and Steel Institute (AISI) and the American Society for Testing and Materials (ASTM) for easier classification and identification. AISI typically follows a four digit system, where the first two digits indicate the alloy, and the second two digits denote the carbon content. ASTM uses an “A” to denote ferrous materials, followed by an arbitrarily assigned number for each alloy.
Regardless of the system used, this standardization allows cross talk between designers, engineers, and builders to ensure the proper material is being selected and used in engineering projects. It also makes looking up physical properties of alloys very easy, as a simple search with the identification number produces the correct information.
Three welding processes
Three types of welding processes:
Electric Resistance Welding: During ERW, a high frequency electrical current is transmitted to the material by means of copper sliding contacts so that the abutting edges initiate fusion as they come into contact.
Longitudinal Submerged Arc Welding: In LSAW, the butt joint of the pipe is welded in at least two phases, one of which is on the inside of the pipe. The welds are made by heating with an electrode arc between the bare metal electrodes. Pressure is not used. Filler metal for the welds is obtained from the electrodes.
Spiral Submerged Arc Welding: Spiral SAW allows large diameter pipes to be produced from narrower plates or skelps. During this process, the weld pool is protected against oxidation by a flux produced from the electrode fed separately onto the weld.
Electric Resistance Welding: During ERW, a high frequency electrical current is transmitted to the material by means of copper sliding contacts so that the abutting edges initiate fusion as they come into contact.
Longitudinal Submerged Arc Welding: In LSAW, the butt joint of the pipe is welded in at least two phases, one of which is on the inside of the pipe. The welds are made by heating with an electrode arc between the bare metal electrodes. Pressure is not used. Filler metal for the welds is obtained from the electrodes.
Spiral Submerged Arc Welding: Spiral SAW allows large diameter pipes to be produced from narrower plates or skelps. During this process, the weld pool is protected against oxidation by a flux produced from the electrode fed separately onto the weld.
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