Pipeline Hot Rolled Cold Rolled Seamless Steel Pipes 13.7mm-609.6mm Outer Diameter

Hot-Rolled Cold-Rolled Seamless Steel Pipes

Seamless steel pipes are long, hollow cylindrical steel products without any longitudinal welds or seams. They are made from the piercing of solid billets and then hot or cold rolled into shape. Seamless steel pipes are known for their high-strength, good toughness, light weight, and narrow wall thickness, making them suitable for a variety of applications where high pressure and temperature tolerance are required.

Classification of Seamless Steel Pipes

1. Structural Seamless Steel Pipes: These pipes are used for general structural purposes and mechanical structures. They are typically made from carbon steel, alloy steel, or stainless steel and are specified in standards such as GB/T 8162-20189.

2. Fluid Transportation Seamless Pipes: Designed for the transportation of fluids such as water, oil, gas, and certain solid materials. They are covered by standards like GB/T 8163-20085.

3. Low and Medium Pressure Boiler Pipes: These pipes are made from high-quality carbon steel and are used for manufacturing boilers, steam pipes, and other equipment that operates under low and medium pressures, following standards like GB 3087-20085.

4. High-Pressure Boiler Pipes: Used for high-pressure and above boilers, these pipes are made from high-quality carbon steel, alloy steel, and stainless steel, as defined in GB5310-20085.

5. Seamless Pipes for High-Pressure Fertilizer Equipment: These are used in the manufacture of seamless steel pipes for high-pressure equipment in the fertilizer industry, conforming to standards like GB 6479-2000.

6. Seamless Pipes for Petroleum Cracking: Used in petroleum refineries for boilers, heat exchangers, and fluid transportation pipes, with representative materials such as 20, 12 CrMo, 1Cr5Mo, 1Cr19Ni11Nb, as per GB 9948-20065.

7. Seamless Pipes for Geological Drilling: These pipes are used for core drilling in the geological sector and can be categorized into drill rods, drill collars, core barrels, casing pipes, and sediment pipes.

8. API Seamless Pipes: Specifically designed for the petroleum industry, these pipes adhere to the standards set by the American Petroleum Institute (API) for high-quality pipes used in drilling, production, and transportation.

9. Stainless Steel Seamless Pipes: These pipes offer high corrosion resistance and are used in environments where chemicals, salts, and other corrosive agents are present.

10. Alloy Seamless Pipes: Containing various alloying elements, these pipes provide enhanced strength and resistance to high temperatures and pressures.

11. Carbon Steel Seamless Pipes: Made from carbon steel, these pipes are widely used for their cost-effectiveness and are suitable for lower pressure applications.

12. Thick-Walled Seamless Pipes: These pipes have a thicker wall and are used for applications requiring high-pressure tolerance.

​Standards and Applications