High-strength low-alloy (HSLA) steels, or microalloyed steels, are designed to provide better mechanical properties and/or greater resistance to atmospheric corrosion than conventional carbon steels in the normal sense because they are designed to meet specific mechanical properties rather than a chemical composition.
The HSLA steels have low carbon contents (0.05-0.25% C) in order to produce adequate formability and weldability, and they have manganese contents up to 2.0%. Small quantities of chromium, nickel, molybdenum, copper, nitrogen, vanadium, niobium, titanium and zirconium are used in various combinations.
HSLA Classification:
Weathering steels, designated to exhibit superior atmospheric corrosion resistance.
Control-rolled steels, hot rolled according to a predetermined rolling schedule, designed to develop a highly deformed austenite structure that will transform to a very fine equiaxed ferrite structure on cooling.
Pearlite-reduced steels, strengthened by very fine-grain ferrite and precipitation hardening but with low carbon content and therefore little or no pearlite in the microstructure.
Microalloyed steels, with very small additions of such elements as niobium, vanadium, and/or titanium for refinement of grain size and/or precipitation hardening.
Acicular ferrite steel, very low carbon steels with sufficient hardenability to transform on cooling to a very fine high-strength acicular ferrite structure rather than the usual polygonal ferrite structure.
Dual-phase steels, processed to a micro-structure of ferrite containing small uniformly distributed regions of high-carbon martensite, resulting in a product with low yield strength and a high rate of work hardening, thus providing a high-strength steel of superior formability.
The various types of HSLA steels may also have small additions of calcium, rare earth elements, or zirconium for sulfide inclusion shape control.
2019年11月19日星期二
Specification and requirements for marking of seamless steel tubes
In the relevant regulations, there are a series of regulations and requirements for seamless steel pipe marking. The specific requirements for the logo are as follows:
1. The seamless steel pipe manufacturer's logo should be eye-catching, firm, clear, standardized, and not easy to fade.
2. The mark shall include at least the following contents: the name and trademark of the seamless steel pipe manufacturer, the product standard number, the grade of the steel pipe, the product specification and the traceability identification number or telephone number. For precision seamless steel tubes, you can increase the main performance indicators and dimensional precision levels.
Seamless steel pipe marking
3. The standard can be printed, stamped, scrolled, printed, pasted imprint or hang tags, tag and other methods, the supplier can hang one or more signs method.
4. Steel pipes with an outer diameter of not less than 36 mm shall be started at a distance of not less than 200 mm from the end of the seamless steel pipe, and each of the marking methods shall be carried out.
5. For low-pressure fluid seamless steel pipe and thin-walled seamless steel pipe, seamless steel pipe and other general-purpose seamless steel pipe, cross-section seamless steel pipe, complex cross-section seamless steel pipe can not be every mark.
6. Pipe joints of seamless steel pipes for petroleum, gas, 3PE anticorrosion, etc., shall have the grade mark of seamless steel pipe.
7. In the case of a container package, a bracket welding package or a thin-walled seamless steel pipe set. A label or tag should be attached to the seamless steel pipe on the outer layer of the container, bracket, and thin-walled seamless steel pipe.
http://www.xysteelpipe.com/info/Specification-and-requirements-for-marking-of-seamless-steel-tubes-1556-1.htm
1. The seamless steel pipe manufacturer's logo should be eye-catching, firm, clear, standardized, and not easy to fade.
2. The mark shall include at least the following contents: the name and trademark of the seamless steel pipe manufacturer, the product standard number, the grade of the steel pipe, the product specification and the traceability identification number or telephone number. For precision seamless steel tubes, you can increase the main performance indicators and dimensional precision levels.
Seamless steel pipe marking
3. The standard can be printed, stamped, scrolled, printed, pasted imprint or hang tags, tag and other methods, the supplier can hang one or more signs method.
4. Steel pipes with an outer diameter of not less than 36 mm shall be started at a distance of not less than 200 mm from the end of the seamless steel pipe, and each of the marking methods shall be carried out.
5. For low-pressure fluid seamless steel pipe and thin-walled seamless steel pipe, seamless steel pipe and other general-purpose seamless steel pipe, cross-section seamless steel pipe, complex cross-section seamless steel pipe can not be every mark.
6. Pipe joints of seamless steel pipes for petroleum, gas, 3PE anticorrosion, etc., shall have the grade mark of seamless steel pipe.
7. In the case of a container package, a bracket welding package or a thin-walled seamless steel pipe set. A label or tag should be attached to the seamless steel pipe on the outer layer of the container, bracket, and thin-walled seamless steel pipe.
http://www.xysteelpipe.com/info/Specification-and-requirements-for-marking-of-seamless-steel-tubes-1556-1.htm
2019年11月7日星期四
Resistance welding tube process principle
The electric resistance welded pipe (ERW steel pipe) is a method in which a weld is combined and pressure is applied through an electrode, and the electric current is welded by the electric resistance generated by the contact surface of the joint and the adjacent region. When high-frequency currents pass through metal conductors, two strange effects occur: skin effect and proximity effect, high-frequency welding is to use these two effects to weld the steel pipe, these two effects are the basis for achieving high-frequency welding of metal. High-frequency welding uses the skin effect to concentrate the energy of the high-frequency current on the surface of the workpiece; the proximity effect is used to control the position and range of the high-frequency current flow path. The speed of the current is very fast, it can heat, melt and join the adjacent steel plate edges in a short time.
Geometric seamlessness is to remove the internal and external burrs of the ERW steel pipe. Due to the continuous improvement and improvement of the structure and cutter of the inner burr removal system, the removal of the inner burr of the large and medium diameter steel pipe has been well treated. The inner burr can be controlled at about -0.2mm to about 0.5mm.
Physical seamlessness means that there is a difference between the metallographic structure inside the weld and the base metal, which leads to a decrease in the mechanical properties of the weld zone, and measures need to be taken to make it uniform and uniform.
http://www.xysteelpipe.com/info/Resistance-welding-tube-process-principle-1544-1.htm
Geometric seamlessness is to remove the internal and external burrs of the ERW steel pipe. Due to the continuous improvement and improvement of the structure and cutter of the inner burr removal system, the removal of the inner burr of the large and medium diameter steel pipe has been well treated. The inner burr can be controlled at about -0.2mm to about 0.5mm.
Physical seamlessness means that there is a difference between the metallographic structure inside the weld and the base metal, which leads to a decrease in the mechanical properties of the weld zone, and measures need to be taken to make it uniform and uniform.
http://www.xysteelpipe.com/info/Resistance-welding-tube-process-principle-1544-1.htm
The importance of seamless steel tubes in the industrial sector
Seamless steel pipe is a special pipe material, including a wide range of applications. The most common materials are carbon steel and stainless steel. The specifications of replacement products are relatively easy. At present, many seamless steel pipe production , still use the small batch production method, this manufacturing method should be said to be the most common one, the mechanized production mode, to some extent, improve the production efficiency of seamless steel pipe, using the operation mode of the entire production line operation, greatly increase production.
The heating furnace used in the production of seamless steel tubes is a ring-shaped heating furnace. In addition to this type of heating furnace, there are other types of heating furnaces. Depending on the production of seamless steel tubes, there are also differences in specific heating methods.
After the heat treatment is completed, further processing, including straightening, finishing and inspection, is required to ensure that the quality of the seamless steel pipe is maintained at the highest level when it is on the scene, so the inspection steps are essential.
At the same time, the demand for various accessory materials is also increasing, especially for the demand for various pipe materials. Judging from the current market environment, various types of pipe materials are widely used, different types of pipes, and different fields of application. Among them, the most worth mentioning is the seamless steel pipe, which has a very significant advantage. Therefore, the scale of production will continue to expand.
When it comes to quality, the production process and inspection level of seamless steel tubes are also constantly improving. With the introduction of new technologies, both in terms of production efficiency and product quality, there are significant improvements and developments. The development is also a testimony to the success of the industrial sector. Especially in the fields of construction, machinery manufacturing, etc., the role played by seamless steel pipes is also not to be underestimated. In addition, in the field of pipeline transportation, seamless steel pipes also have significant advantages, which can greatly improve transportation safety.
The seamless steel pipe needs to be inspected for its mechanical properties before leaving the factory, especially the tensile strength, yield point, elongation after break and hardness index of the seamless steel pipe, so as to ensure that the seamless steel pipe can be Quality is guaranteed. According to the differences in specific fields of use, there are certain differences in the production process of seamless steel tubes. The more common ones are alloy structure and carbon structure. In the field of pipeline transportation, the utilization rate of seamless steel pipes is very high, because compared with other types of transportation methods, pipeline transportation is not only safe, but also relatively low in cost, so the demand for seamless steel pipe production will be relatively large.
The manufacturer also supplies some seamless steel pipes with special use, such as seamless steel tubes for boilers, seamless steel tubes for geological use, etc. This professionally produced pipe material can be of higher value in the industrial manufacturing field. Depending on the material, the price difference between seamless steel pipes is also great.
http://www.xysteelpipe.com/info/The-importance-of-seamless-steel-tubes-in-the-industrial-sector-1543-1.htm
The heating furnace used in the production of seamless steel tubes is a ring-shaped heating furnace. In addition to this type of heating furnace, there are other types of heating furnaces. Depending on the production of seamless steel tubes, there are also differences in specific heating methods.
After the heat treatment is completed, further processing, including straightening, finishing and inspection, is required to ensure that the quality of the seamless steel pipe is maintained at the highest level when it is on the scene, so the inspection steps are essential.
At the same time, the demand for various accessory materials is also increasing, especially for the demand for various pipe materials. Judging from the current market environment, various types of pipe materials are widely used, different types of pipes, and different fields of application. Among them, the most worth mentioning is the seamless steel pipe, which has a very significant advantage. Therefore, the scale of production will continue to expand.
When it comes to quality, the production process and inspection level of seamless steel tubes are also constantly improving. With the introduction of new technologies, both in terms of production efficiency and product quality, there are significant improvements and developments. The development is also a testimony to the success of the industrial sector. Especially in the fields of construction, machinery manufacturing, etc., the role played by seamless steel pipes is also not to be underestimated. In addition, in the field of pipeline transportation, seamless steel pipes also have significant advantages, which can greatly improve transportation safety.
The seamless steel pipe needs to be inspected for its mechanical properties before leaving the factory, especially the tensile strength, yield point, elongation after break and hardness index of the seamless steel pipe, so as to ensure that the seamless steel pipe can be Quality is guaranteed. According to the differences in specific fields of use, there are certain differences in the production process of seamless steel tubes. The more common ones are alloy structure and carbon structure. In the field of pipeline transportation, the utilization rate of seamless steel pipes is very high, because compared with other types of transportation methods, pipeline transportation is not only safe, but also relatively low in cost, so the demand for seamless steel pipe production will be relatively large.
The manufacturer also supplies some seamless steel pipes with special use, such as seamless steel tubes for boilers, seamless steel tubes for geological use, etc. This professionally produced pipe material can be of higher value in the industrial manufacturing field. Depending on the material, the price difference between seamless steel pipes is also great.
http://www.xysteelpipe.com/info/The-importance-of-seamless-steel-tubes-in-the-industrial-sector-1543-1.htm
2019年10月28日星期一
In which case, the steel pipe needs anti-corrosion treatment
There are three cases of steel pipe anti-corrosion treatment:
1) If it is used in a general warehouse or canopy or workshop, it is not required to be treated with antiseptic treatment;
2) If used in chemical workshops or in workshops or other structures with corrosive contact, anti-corrosion treatment is required;
3) There are special requirements for steel pipes;
The steel pipe anti-corrosion quota can be installed as follows
1, Enhance the adhesion of the topcoat to the substrate to prevent the coating from penetrating too much into the substrate.
2, anti-alkali. The enclosed base alkali penetrates into the coating to reduce erosion of the topcoat.
3, Anti-rust, to prevent the corrosion of the top paint after the iron products in the base layer are rusted. In addition, the use of a primer can also enhance the texture of the system, save the amount of topcoat and shorten the construction time. Direct construction without primer will affect the appearance and texture of the paint film, and may also cause problems such as chalking. Metal coating without primer can not achieve effective rust prevention.
1) If it is used in a general warehouse or canopy or workshop, it is not required to be treated with antiseptic treatment;
2) If used in chemical workshops or in workshops or other structures with corrosive contact, anti-corrosion treatment is required;
3) There are special requirements for steel pipes;
The steel pipe anti-corrosion quota can be installed as follows
1, Enhance the adhesion of the topcoat to the substrate to prevent the coating from penetrating too much into the substrate.
2, anti-alkali. The enclosed base alkali penetrates into the coating to reduce erosion of the topcoat.
3, Anti-rust, to prevent the corrosion of the top paint after the iron products in the base layer are rusted. In addition, the use of a primer can also enhance the texture of the system, save the amount of topcoat and shorten the construction time. Direct construction without primer will affect the appearance and texture of the paint film, and may also cause problems such as chalking. Metal coating without primer can not achieve effective rust prevention.
2019年10月27日星期日
Introduction of alloy steel tube
The alloy steel tube is mainly used for the heating surface tube of low and medium pressure boilers (the working pressure is generally not more than 5.88Mpa and the working temperature is below 450°C); it is used for high pressure boilers (the working pressure is generally above 9.8Mpa, and the working temperature is 450°C～650 °C), heating surface pipe, economizer, superheater, reheater, petrochemical industrial pipe, etc.
High-pressure alloy pipe grade: 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, SA210A1, SA210C, SA213 T11, SA213 T12, SA213 T22, SA213 T23, SA213 T91, SA213 T92, ST45.8/III, 15Mo3, 13CrMo44, 10CrMo910, etc.
1, Application
The main purpose of alloy steel pipe is used in high-pressure high-temperature pipelines and equipment such as power plants, nuclear power, high-pressure boilers, high-temperature superheaters and reheaters. It is made of high-quality carbon steel, alloy structural steel and stainless steel. It is formed by hot rolling (extrusion, expansion) or cold rolling (drawing).
2, Advantages
It can be 100% recycled, in line with the national strategy of environmental protection, energy saving and resource conservation. The national policy encourages the expansion of the application field of high-pressure alloy tubes. At present, China's alloy tube consumption accounts for half of the total amount of steel in developed countries, and the expansion of alloy tube use provides a broader space for industry development. According to the research of the expert group of the alloy pipe branch of China Special Steel Association, the demand for long-term high-pressure alloy pipe in China will increase by 10-12% annually.
3, Contact and difference with seamless pipes
The alloy pipe is defined by the production material (that is, the material). As the name suggests, it is the pipe made of alloy; and the seamless pipe is defined by the production process (seam seamless), which is different from the seamless pipe. There are seam pipes, including straight seam welded pipes and spiral welded pipes.
4, Standard
The alloy tube has a hollow section and is used as a conduit for transporting fluids, such as pipes for transporting petroleum, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, alloy steel pipe has light weight when the bending and torsional strength are the same. Alloy steel pipe is an economical section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe and automobile transmission. Shafts, bicycle frames, and steel scaffolding used in construction. The use of alloy steel pipe to manufacture ring parts can improve the material utilization rate, simplify the manufacturing process, save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., and have been widely used in steel pipes. Alloy steel pipes are also indispensable materials for various conventional weapons, and barrels, barrels, etc. are all made of steel pipes. Alloy steel pipes can be divided into round pipes and shaped pipes according to the shape of the cross-sectional area. Since the area of the circle is the largest under the condition of equal circumference, more fluid can be transported by the circular tube. In addition, the circular section is subjected to a relatively uniform force when subjected to internal or external radial pressure, and therefore, most of the steel pipes are round pipes.
High-pressure alloy pipe grade: 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, SA210A1, SA210C, SA213 T11, SA213 T12, SA213 T22, SA213 T23, SA213 T91, SA213 T92, ST45.8/III, 15Mo3, 13CrMo44, 10CrMo910, etc.
1, Application
The main purpose of alloy steel pipe is used in high-pressure high-temperature pipelines and equipment such as power plants, nuclear power, high-pressure boilers, high-temperature superheaters and reheaters. It is made of high-quality carbon steel, alloy structural steel and stainless steel. It is formed by hot rolling (extrusion, expansion) or cold rolling (drawing).
2, Advantages
It can be 100% recycled, in line with the national strategy of environmental protection, energy saving and resource conservation. The national policy encourages the expansion of the application field of high-pressure alloy tubes. At present, China's alloy tube consumption accounts for half of the total amount of steel in developed countries, and the expansion of alloy tube use provides a broader space for industry development. According to the research of the expert group of the alloy pipe branch of China Special Steel Association, the demand for long-term high-pressure alloy pipe in China will increase by 10-12% annually.
3, Contact and difference with seamless pipes
The alloy pipe is defined by the production material (that is, the material). As the name suggests, it is the pipe made of alloy; and the seamless pipe is defined by the production process (seam seamless), which is different from the seamless pipe. There are seam pipes, including straight seam welded pipes and spiral welded pipes.
4, Standard
The alloy tube has a hollow section and is used as a conduit for transporting fluids, such as pipes for transporting petroleum, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, alloy steel pipe has light weight when the bending and torsional strength are the same. Alloy steel pipe is an economical section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe and automobile transmission. Shafts, bicycle frames, and steel scaffolding used in construction. The use of alloy steel pipe to manufacture ring parts can improve the material utilization rate, simplify the manufacturing process, save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., and have been widely used in steel pipes. Alloy steel pipes are also indispensable materials for various conventional weapons, and barrels, barrels, etc. are all made of steel pipes. Alloy steel pipes can be divided into round pipes and shaped pipes according to the shape of the cross-sectional area. Since the area of the circle is the largest under the condition of equal circumference, more fluid can be transported by the circular tube. In addition, the circular section is subjected to a relatively uniform force when subjected to internal or external radial pressure, and therefore, most of the steel pipes are round pipes.
What is a neck flange?Where is it used?
The neck flange, also known as the WN flange, has the primary function of joining two components into a given pipe system. Mounted in pairs, the contact between the two parts is guaranteed by the compression performed.
The neck flange was developed with the mission of transferring tension to the pipe. This transfer is intended to reduce the pressure at the base of the flange.
It can be used for any combination of pressure and temperature and furthermore, the neck flange attached to the pipe by a single butt weld gives lower residual stresses than the overlap type, for example. Assembly requires that the pipe be cut to the exact size and bevelled for the butt weld.
Other features of neck flange:
Tapered neck, above average strength, which prevents part deformation, beveled end, structure designed to withstand varying and high pressure and temperature, and weldability to the top of the flange.
And Prime Steel Pipe has the mission to offer the highest quality products at a fair price, able to meet the needs of its customers, achieving consistently better results, as its competence and talent are added to the technical capacity, experience and knowledge of the company. company to form a set of values that position it as a market leader.
The neck flange was developed with the mission of transferring tension to the pipe. This transfer is intended to reduce the pressure at the base of the flange.
It can be used for any combination of pressure and temperature and furthermore, the neck flange attached to the pipe by a single butt weld gives lower residual stresses than the overlap type, for example. Assembly requires that the pipe be cut to the exact size and bevelled for the butt weld.
Other features of neck flange:
Tapered neck, above average strength, which prevents part deformation, beveled end, structure designed to withstand varying and high pressure and temperature, and weldability to the top of the flange.
And Prime Steel Pipe has the mission to offer the highest quality products at a fair price, able to meet the needs of its customers, achieving consistently better results, as its competence and talent are added to the technical capacity, experience and knowledge of the company. company to form a set of values that position it as a market leader.
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