The main purpose of alloy steel pipes is to use in power plants, nuclear power, high-pressure boilers, high-temperature superheaters and reheaters and other high-pressure and high-temperature pipelines and equipment. It is made of high-quality carbon steel, alloy structural steel and stainless heat-resistant steel. , After hot rolling (extruding, expanding) or cold rolling (drawing).
Alloy pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, coal gas, water and certain solid materials. Compared with solid steel such as round steel, alloy steel pipe is lighter when the bending and torsion strength is the same. Alloy steel pipe is a kind of economical cross-section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes and automobile transmission. Axes, bicycle frames and steel scaffolding used in building construction, etc. The use of alloy steel pipes to manufacture ring-shaped parts can increase the utilization rate of materials, simplify the manufacturing process, and save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., which have been widely used for manufacturing at present. Alloy steel pipes are also an indispensable material for various conventional weapons. Gun barrels and barrels are all made of steel pipes. Alloy steel pipes can be divided into round pipes and special-shaped pipes according to different cross-sectional area shapes. Since the circle area is the largest under the condition of the same circumference, more fluid can be transported with a circular tube. In addition, when the ring section bears internal or external radial pressure, the force is relatively uniform. Therefore, most steel pipes are round pipes.
The biggest advantage of alloy steel pipes is that they can be 100% recycled, which is in line with the national strategy of environmental protection, energy saving and resource saving. The national policy encourages the expansion of the application fields of high-pressure alloy pipes. At present, the consumption of alloy tubes in my country accounts for only half of the total steel products in developed countries. The expansion of the use of alloy tubes provides a broader space for the development of the industry. According to the research conducted by the Expert Group of the Alloy Pipe Branch of the China Special Steel Association, the demand for high-pressure alloy pipe long products in my country will increase by 10-12% annually in the future. Alloy pipe is defined by steel pipe according to the production materials (that is, material), as the name suggests, is pipe made of alloy; while seamless pipe is defined by steel pipe according to the production process (seamless and seamless), the difference from seamless pipe is Seam pipes, including straight seam welded pipes and spiral pipes.
Mechanical properties
Alloy pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, coal gas, water and certain solid materials. Compared with solid steel such as round steel, alloy steel pipe is lighter when the bending and torsion strength is the same. Alloy steel pipe is a kind of economical cross-section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes and automobile transmission. Axes, bicycle frames and steel scaffolding used in building construction, etc. The use of alloy steel pipes to manufacture ring-shaped parts can increase the utilization rate of materials, simplify the manufacturing process, and save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., which have been widely used for manufacturing at present. Alloy steel pipes are also an indispensable material for various conventional weapons. Gun barrels and barrels are all made of steel pipes. Alloy steel pipes can be divided into round pipes and special-shaped pipes according to different cross-sectional area shapes. Since the circle area is the largest under the condition of the same circumference, more fluid can be transported with a circular tube. In addition, when the ring section bears internal or external radial pressure, the force is relatively uniform. Therefore, most steel pipes are round pipes.
The biggest advantage of alloy steel pipes is that they can be 100% recycled, which is in line with the national strategy of environmental protection, energy saving and resource saving. The national policy encourages the expansion of the application fields of high-pressure alloy pipes. At present, the consumption of alloy tubes in my country accounts for only half of the total steel products in developed countries. The expansion of the use of alloy tubes provides a broader space for the development of the industry. According to the research conducted by the Expert Group of the Alloy Pipe Branch of the China Special Steel Association, the demand for high-pressure alloy pipe long products in my country will increase by 10-12% annually in the future. Alloy pipe is defined by steel pipe according to the production materials (that is, material), as the name suggests, is pipe made of alloy; while seamless pipe is defined by steel pipe according to the production process (seamless and seamless), the difference from seamless pipe is Seam pipes, including straight seam welded pipes and spiral pipes.
Mechanical properties
| Standard | Brand | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Hardness |
| GB3087 | 10 | 335～475 | ≥195 | ≥24 | / |
| 20 | 410～550 | ≥245 | ≥20 | / | |
| GB5310 | 20G | 410～550 | ≥245 | ≥24 | / |
| 20MnG | ≥415 | ≥240 | ≥22 | / | |
| 25MnG | ≥485 | ≥275 | ≥20 | / | |
| 15CrMoG | 440～640 | ≥235 | ≥21 | / | |
| 12Cr2MoG | 450～600 | ≥280 | ≥20 | / | |
| 12Cr1MoVG | 470～640 | ≥255 | ≥21 | / | |
| 12Cr2MoWVTiB | 540～735 | ≥345 | ≥18 | / | |
| 10Cr9Mo1VNb | ≥585 | ≥415 | ≥20 | / | |
| ASME SA210 | SA210A-1 | ≥415 | ≥255 | ≥30 | ≤143HB |
| SA210C | ≥485 | ≥275 | ≥30 | ≤179HB | |
| ASME SA213 | SA213 T11 | ≥415 | ≥205 | ≥30 | ≤163HB |
| SA213 T12 | ≥415 | ≥220 | ≥30 | ≤163HB | |
| SA213 T22 | ≥415 | ≥205 | ≥30 | ≤163HB | |
| SA213 T23 | ≥510 | ≥400 | ≥20 | ≤220HB | |
| SA213 T91 | ≥585 | ≥415 | ≥20 | ≤250HB | |
| SA213 T92 | ≥620 | ≥440 | ≥20 | ≤250HB | |
| DIN17175 | ST45.8/Ⅲ | 410～530 | ≥255 | ≥21 | / |
| 15Mo3 | 450～600 | ≥270 | ≥22 | ||
| 13CrMo44 | 440～590 | ≥290 | ≥22 | / | |
| 10CrMo910 | 480～630 | ≥280 | ≥20 | / |
