P22 alloy steel pipe

The key advantage of P22 alloy steel pipe is its 100% recyclability, which aligns with national environmental protection and resource-saving strategies. As a result, government policies actively promote the broader application of high-pressure alloy pipes in various industries. These pipes are widely used in sectors that require durable and reliable materials for high-temperature and high-pressure environments. Seamless steel pipes are categorized based on their manufacturing processes, primarily 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):** The process begins with a round tube billet, followed by heating, perforation, three-roll skew rolling, continuous rolling, or extrusion. After tube removal, sizing, cooling, straightening, water pressure testing, marking, and storage, the final product is ready for distribution. - **Cold Drawing (Rolled Seamless Steel Pipe):** This method involves heating, perforation, heading, annealing, pickling, oiling (or copper plating), multi-pass cold drawing or rolling, heat treatment, straightening, hydraulic testing, marking, and finally warehousing. Seamless steel pipes come in various types based on their applications: - **GB/T 8162-1999:** Used for general structural and mechanical purposes. Materials include carbon steels like 20 and 45, as well as alloy steels such as Q345, 20Cr, 40Cr, and 42CrMo. - **GB/T 8163-1999:** Designed for fluid transportation in engineering and large equipment. Common materials include 20 and Q345. - **GB 3087-1999:** For low and medium pressure boiler pipelines. Materials like 10 and 20 steel are typically used. - **GB 5310-1995:** Used in high-pressure boilers in power plants and nuclear facilities. Representative materials include 20G, 12Cr1MoVG, and 15CrMoG. - **GB 5312-1999:** For marine boilers and superheaters. Materials such as 360, 410, and 460 steel grades are common. - **GB 9948-1988:** For petroleum cracking applications. Materials like 20, 12CrMo, and 1Cr5Mo are frequently used. - **GB 18248-2000:** For gas and hydraulic cylinders. Materials include 37Mn, 34Mn2V, and 35CrMo. - **GB/T 17396-1998:** For hydraulic supports in coal mines. Common materials are 20, 45, and 27SiMn. - **GB 3093-1986:** For diesel engine injection systems. Cold-drawn pipes made from 20A are typical. - **GB/T 3639-1983:** For precision mechanical structures requiring high accuracy and smooth surfaces. Materials like 20 and 45 steel are used. - **GB/T 3094-1986:** For special-shaped steel pipes used in structural parts. High-quality carbon and low-alloy steels are commonly applied. - **GB/T 8713-1988:** For hydraulic and pneumatic cylinders requiring precise inner diameters. Materials such as 20 and 45 steel are often selected. - **GB 13296-1991:** For chemical industry applications involving high temperature, high pressure, and corrosion resistance. Materials like 0Cr18Ni9 and 1Cr18Ni9Ti are standard. - **GB/T 14975-2002:** For general structural uses in chemical and architectural settings. Materials include 0Cr18Ni9 and 1Cr18Ni9Ti. - **GB/T 14976-2002:** For transporting corrosive media. Common materials are 0Cr13, 0Cr18Ni9, and 0Cr17Ni12Mo2. - **YB/T 5035-1993:** For automobile half-shaft casings. Materials like 45, 40Cr, and 20CrNi3A are used. - **API SPEC 5CT-1999:** A globally recognized standard for casing and tubing in the oil and gas industry. Casing pipes are used to line well walls, while tubing pipes transport oil from the reservoir to the surface. Materials include J55, N80, P110, and C90. - **Line Pipe:** Used to transport oil, gas, or water over long distances. Available in both seamless and welded forms, with materials such as B, X42, X56, X65, and X70. **Welded Steel Pipes:** Welded steel pipes are manufactured from steel sheets or strips and are classified based on welding methods—furnace-welded, electric-welded, and automatic arc-welded. They can also be either straight-seam or spiral-welded. These pipes are ideal for conveying low-pressure fluids such as water, gas, air, and steam. A common material is Q235A grade steel. - **GB/T 3092-1993:** For low-pressure fluid transportation, including water, gas, and steam. Q235A is a typical material. - **GB/T 14291-1992:** For mine ventilation and drainage. Q235A and B grade steels are commonly used. - **GB/T 14980-1994:** For large diameter pipes used in low-pressure fluid systems. Q235A is the main material. - **GB/T 12770-1991:** For mechanical structures in automotive, furniture, and decorative applications. Materials include 0Cr13, 1Cr17, and 0Cr18Ni9. - **GB/T 12771-1991:** For low-pressure corrosive media transportation. Materials like 0Cr13, 0Cr19Ni9, and 00Cr17 are often used. These pipes play a critical role in modern infrastructure, industrial systems, and energy production, offering durability, reliability, and versatility across a wide range of applications.

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