P22 alloy steel pipe

The primary advantage of P22 alloy steel pipes is their 100% recyclability, aligning with national environmental protection and resource conservation strategies. This makes them a sustainable choice that supports energy efficiency and long-term ecological goals. As a result, government policies actively encourage the expansion of high-pressure alloy pipe applications in various industries. Seamless steel pipes are categorized based on their manufacturing processes into hot-rolled (extruded) and cold-drawn (rolled) types. Cold-drawn tubes can further be divided into round and special-shaped sections, depending on their intended use. **Process Flow Overview** - **Hot Rolling (Extruded Seamless Steel Pipe):** Round tube billet → Heating → Piercing → Three-roll skew rolling, continuous rolling, or extrusion → Tube removal → Sizing (or diameter reduction) → Cooling → Billet tube → Straightening → Hydrostatic test (or flaw detection) → Marking → Storage. - **Cold Drawing (Rolled) Seamless Steel Pipe:** Round tube billet → Heating → Piercing → Heading → Annealing → Pickling → Oiling (copper plating) → Multi-pass cold drawing (cold rolling) → Billet → Heat treatment → Straightening → Hydraulic test (flaw detection) → Marking → Warehousing. Seamless steel pipes are available in various types based on their application: - **GB/T8162-1999 (Structural Seamless Steel Pipe):** Used for general mechanical and structural purposes. Common materials include carbon steels like 20 and 45, as well as alloy steels such as Q345, 20Cr, 40Cr, and 42CrMo. - **GB/T8163-1999 (Fluid Conveying Seamless Steel Pipe):** Ideal for fluid transport in engineering and large-scale equipment. Materials commonly used are 20 and Q345. - **GB3087-1999 (Low and Medium Pressure Boiler Seamless Pipes):** Designed for low and medium pressure fluid pipelines in industrial and domestic boilers. Typical materials are 10 and 20 steel. - **GB5310-1995 (High Pressure Boiler Seamless Pipes):** Used in power plants and nuclear facilities for high-temperature and high-pressure fluid transport. Representative materials include 20G, 12Cr1MoVG, and 15CrMoG. - **GB5312-1999 (Ship Boiler Seamless Pipes):** For pressure-resistant piping in marine boilers and superheaters. Common grades are 360, 410, and 460. - **GB9948-1988 (Petroleum Cracking Seamless Pipes):** Applied in oil refining equipment such as boilers and heat exchangers. Materials include 20, 12CrMo, and 1Cr19Ni11Nb. - **GB18248-2000 (Gas Cylinder Seamless Pipes):** Used to manufacture gas and hydraulic cylinders. Common materials are 37Mn, 34Mn2V, and 35CrMo. - **GB/T17396-1998 (Hydraulic Prop Seamless Pipes):** Mainly used in coal mines for hydraulic supports and columns. Materials include 20, 45, and 27SiMn. - **GB3093-1986 (Diesel Engine High Pressure Pipes):** Used in diesel engine injection systems. These are typically cold-drawn pipes made from 20A steel. - **GB/T3639-1983 (Precision Cold Drawn Seamless Pipes):** Ideal for mechanical structures requiring high dimensional accuracy and smooth surfaces. Common materials are 20 and 45 steel. - **GB/T3094-1986 (Special-Shaped Cold Drawn Seamless Pipes):** Used for structural parts and components, made from high-quality carbon and low-alloy steels. - **GB/T8713-1988 (Precision Inner Diameter Seamless Pipes):** Designed for hydraulic and pneumatic cylinders with precise inner diameters. Common materials are 20 and 45 steel. - **GB13296-1991 (Boiler and Heat Exchanger Stainless Steel Pipes):** Used in chemical plants for high-temperature and high-pressure environments. Materials include 0Cr18Ni9, 1Cr18Ni9Ti, and 0Cr18Ni12Mo2Ti. - **GB/T14975-2002 (Stainless Structural Steel Pipes):** Used in general structures and mechanical parts that require corrosion resistance and moderate strength. Materials include 0Cr13, 0Cr18Ni9, and 1Cr18Ni9Ti. - **GB/T14976-2002 (Corrosive Fluid Transport Stainless Pipes):** Used for transporting corrosive media. Materials include 0Cr13, 0Cr18Ni9, and 0Cr17Ni12Mo2. - **YB/T5035-1993 (Automotive Axle Casing Pipes):** Used for making high-quality seamless pipes for automotive half-shafts and drive axles. Common materials are 45, 45Mn2, and 40Cr. - **API SPEC5CT-1999 (Casing and Tubing):** A widely used standard by the American Petroleum Institute for casing and tubing in oil and gas wells. Common grades include J55, N80, P110, and C90, suitable for both conventional and hydrogen sulfide-resistant applications. - **Line Pipe:** Used for transporting oil, gas, and water across the energy industry. Includes both seamless and welded pipes, with materials like B, X42, X56, and X70. **Welded Steel Pipes** Welded steel pipes are produced from steel sheets or strips and are categorized into furnace-welded, electric welded, and automatic arc-welded types. They are also classified as straight-seam or spiral-welded based on their welding method. These pipes are mainly used for conveying low-pressure fluids such as water, gas, air, and steam. The most common material is Q235A steel. - **GB/T3092-1993 (Galvanized Welded Steel Pipe):** Used for low-pressure fluid transportation, including water, gas, and steam. The representative material is Q235A. - **GB/T14291-1992 (Mine Fluid Transport Welded Pipes):** Used for mine ventilation, drainage, and gas discharge. Materials include Q235A and B grades. - **GB/T14980-1994 (Large Diameter Electric Welded Pipes):** Suitable for low-pressure fluid transport such as water, sewage, and gas. Materials are usually Q235A. - **GB/T12770-1991 (Stainless Steel Welded Pipes for Mechanical Structures):** Used in machinery, automobiles, and furniture. Common materials are 0Cr13, 1Cr17, and 0Cr18Ni9. - **GB/T12771-1991 (Stainless Steel Welded Pipes for Fluid Transport):** Used for low-pressure corrosive media. Materials include 0Cr13, 0Cr19Ni9, and 00Cr17.

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