What Are The Applications Of Seamless Pipes?

1. Structural seamless pipes (GB/T8162-2008) are seamless pipes used for general structures and mechanical structures.

2. Seamless pipes for fluid transportation (GB/T8163-2008) are general seamless pipes used to transport fluids such as water, oil, and gas.

3. Seamless pipes for low and medium-pressure boilers (GB3087-2008) are used to manufacture superheated steam pipes, boiling water pipes for low and medium-pressure boilers of various structures, and superheated steam pipes, large smoke pipes, small smoke pipes, and arch bricks for locomotive boilers. High-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless pipes for pipes.

4. Seamless pipes for high-pressure boilers (GB5310-2008) are high-quality carbon steel, alloy steel, and stainless heat-resistant steel seamless pipes used for the heating surfaces of water tube boilers with high pressures and above.

5. High-pressure seamless pipes for fertilizer equipment (GB6479-2000) are high-quality carbon structural steel and alloy steel seamless pipes suitable for chemical equipment and pipelines with working temperatures of -40~400℃ and working pressures of 10~30Ma.

6. Seamless pipes for petroleum cracking (GB9948-2006) are seamless pipes suitable for furnace tubes, heat exchangers, and pipelines in petroleum refineries.

7. Steel pipes for geological drilling (YB235-70) are steel pipes used by geological departments for core drilling. They can be divided into drill pipes, drill collars, core pipes, casings, and sedimentation pipes according to their uses.

8. Seamless pipes for diamond core drilling (GB3423-82) are seamless pipes used for drill pipes, core rods, and casings for diamond core drilling.

9. Oil drilling pipe (YB528-65) is a seamless pipe with internal or external thickening at both ends for oil drilling.

10. Carbon steel seamless pipes for ships (GB5312-85) are carbon steel seamless pipes used in manufacturing ships' Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers, and superheaters. The working temperature of the carbon steel seamless pipe wall does not exceed 450°C, and the working temperature of the alloy steel seamless pipe wall exceeds 450°C.

11. Seamless pipes for automobile axle casings (GB3088-82) are high-quality carbon structural steel and alloy structural steel hot-rolled seamless pipes used for manufacturing automobile axle casings and drive axle housing axle tubes.

12. High-pressure oil pipe for diesel engines (GB3093-86) is a cold-drawn seamless pipe used to manufacture high-pressure pipes for diesel engine injection systems.

13. Precision inner diameter seamless pipes for hydraulic and pneumatic cylinders (GB8713-88) are cold-drawn or cold-rolled precision seamless pipes with precise inner diameters for manufacturing hydraulic and pneumatic cylinders.

14. Cold-drawn or cold-rolled precision seamless pipes (GB3639-83) are cold-drawn or cold-rolled precision seamless pipes with high dimensional accuracy and good surface finish used in mechanical structures and hydraulic equipment. Precision seamless pipes are used to manufacture mechanical structures hydraulic equipment, etc.

15. Stainless steel seamless pipes for structural use (GB/T14975-2002) are hot-rolled ( Extruded, expanded) and cold-drawn (rolled) seamless tubes.

16. Stainless steel seamless pipes for fluid transportation (GB/T14976-2002) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless pipes made of stainless steel used to transport fluids.

17. Special-shaped seamless pipes are the general term for seamless pipes with other cross-sectional shapes except round pipes. According to the different cross-sectional shapes and sizes of steel pipes, they can be divided into special-shaped seamless pipes with equal wall thickness (code-named D), special-shaped seamless pipes with unequal wall thickness (code-named BD), and variable-diameter special-shaped seamless pipes (code-named BJ). Special-shaped seamless pipes are widely used in various structural parts, tools, and mechanical parts.

18. Seamless steel pipes for low-temperature pipelines (GB/T18984-2003) are used for -45℃~-195℃ low-temperature pressure vessel pipes and low-temperature heat exchanger pipes.

Generally used seamless pipes are hot-rolled or cold-rolled from high-quality carbon structural steels such as 10, 20, 30, 35, 45, 16Mn, 5MnV and other low-alloy structural steels, or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloyed steels. Seamless pipes made of 10 and 20-grade low-carbon steel are mainly used for fluid transportation pipelines. Seamless tubes made of medium carbon steel such as 45 and 40Cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors. Generally, seamless pipes must ensure strength and flattening tests. Hot-rolled steel pipes are delivered in a hot-rolled or heat-treated state; cold-rolled steel pipes are delivered in a hot or heat-treated state. Seamless pipes for low and medium-pressure boilers: used to manufacture various low and medium-pressure boilers, superheated steam pipes, boiling water pipes, water-cooled wall pipes, and superheated steam pipes, large smoke pipes, small smoke pipes, and arch brick pipes for locomotive boilers, etc.