Seamless steel pipes are widely used in various industrial applications due to their high strength, durability, and resistance to pressure. Depending on the manufacturing process, seamless steel pipes can be divided into two main types: hot-rolled (extruded) seamless steel pipes and cold-drawn (cold-rolled) seamless steel pipes. Cold-drawn pipes can further be categorized into round tubes and shaped tubes.
The production process of hot-rolled seamless steel pipes typically includes the following steps: raw billet is heated, then pierced, followed by three-roll rolling, continuous rolling, or extrusion. After that, the tube is stripped, sized or reduced, cooled, cut to length, straightened, and subjected to hydrostatic testing or flaw detection before being marked and stored.
For cold-drawn seamless steel pipes, the process starts with a round tube blank, which is heated, pierced, and then undergoes annealing, pickling, oil coating, and multiple passes of cold drawing or rolling. The final stages include heat treatment, straightening, hydrostatic testing, marking, and storage.
In terms of application, seamless steel pipes are classified according to different standards and purposes. For example:
- **GB/T 8162-1999** covers structural seamless steel pipes, mainly used for general mechanical and structural applications. Common materials include carbon steels like 20#, 45# and alloy steels such as Q345, 20Cr, 40Cr, etc.
- **GB/T 8163-1999** refers to fluid-carrying seamless steel pipes, often used in pipelines for engineering and large equipment. Materials like 20#, Q345 are commonly used.
- **GB 3087-1999** applies to low- and medium-pressure boiler tubes, typically made from 10#, 20# steel.
- **GB 5310-1995** is for high-pressure boiler tubes used in power plants and nuclear stations, with materials like 20G, 12Cr1MoVG, and 15CrMoG.
- **GB 5312-1999** is for ship-grade seamless tubes, used in boilers and superheaters, with materials such as 360, 410, 460.
- **GB 1479-2000** is for high-pressure fertilizer equipment, using materials like 20#, 16Mn, 12CrMo, etc.
- **GB 9948-1988** is for petroleum cracking tubes, used in refineries, with materials like 20#, 12CrMo, 1Cr5Mo, etc.
- **GB 18248-2000** is for gas cylinder tubes, commonly made from 37Mn, 34Mn2V, 35CrMo.
- **GB/T 17396-1998** is for hydraulic props in coal mines, using materials like 20#, 45#, 27SiMn.
- **GB 3093-1986** is for diesel engine high-pressure oil pipes, typically cold-drawn, with material 20A.
- **GB/T 3639-1983** is for precision cold-drawn seamless tubes, used in mechanical structures and pressure equipment, with materials like 20#, 45#.
- **GB/T 3094-1986** is for shaped cold-drawn tubes used in structural components, made from high-quality carbon and low-alloy steels.
- **GB/T 8713-1988** is for precision inner diameter tubes used in hydraulic and pneumatic cylinders, with materials like 20#, 45#.
- **GB 13296-1991** is for stainless steel tubes used in boilers and heat exchangers, with materials like 0Cr18Ni9, 1Cr18Ni9Ti, etc.
- **GB/T 14975-1994** is for stainless steel pipes used in structural applications, with materials like 0-3Cr13, 0Cr18Ni9, etc.
- **GB/T 14976-1994** is for stainless steel pipes used in fluid transport, especially in corrosive environments, with materials like 0Cr13, 0Cr18Ni9, etc.
- **YB/T 5035-1993** is for automotive axle sleeves, made from 45#, 45Mn2, 40Cr, etc.
Understanding the classification and application of seamless steel pipes helps in selecting the right type for specific industrial needs. For more detailed information, visit [51 Steel Pipe Network](http://?id=3).
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