Introduction of alloy steel pipe

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
Standard Brand Tensile strength (MPa) Yield strength (MPa) Elongation (%) Hardness
GB3087 10 335475 ≥195 ≥24 /
20 410550 ≥245 ≥20 /  
GB5310 20G 410550 ≥245 ≥24 /
20MnG ≥415 ≥240 ≥22 /  
25MnG ≥485 ≥275 ≥20 /  
15CrMoG 440640 ≥235 ≥21 /  
12Cr2MoG 450600 ≥280 ≥20 /  
12Cr1MoVG 470640 ≥255 ≥21 /  
12Cr2MoWVTiB 540735 ≥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/ 410530 ≥255 ≥21 /
  15Mo3 450600 ≥270 ≥22  
13CrMo44 440590 ≥290 ≥22 /  
10CrMo910 480630 ≥280 ≥20 /  

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