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 categorized into two main types: hot-rolled (extruded) seamless steel pipes and cold-drawn (cold-rolled) seamless steel pipes. Cold-drawn tubes are further divided into round tubes and shaped tubes, each designed for specific purposes.
The production process of hot-rolled seamless steel pipes typically involves the following steps: a round billet is heated, pierced, then rolled using three-roll or continuous rolling methods, followed by sizing, cooling, cutting, straightening, hydrostatic testing, marking, and storage. On the other hand, cold-drawn seamless steel pipes go through a more intricate process that includes heating, piercing, annealing, pickling, oil coating, multiple passes of cold drawing or rolling, heat treatment, and final inspection before being marked and stored.
In terms of application, seamless steel pipes are classified under different standards based on their intended use. For example:
- **GB/T 8162-1999** refers to structural seamless steel pipes, commonly used in general structures and mechanical systems. Materials include carbon steels like 20#, 45# and alloy steels such as Q345, 20Cr, 40Cr, etc.
- **GB/T 8163-1999** covers fluid transport seamless steel pipes, often used in pipelines for engineering and large equipment. Common materials are 20# and Q345.
- **GB 3087-1999** is for low and medium pressure boiler tubes, mainly used in industrial and domestic boilers. Typical materials include 10#, 20#.
- **GB 5310-1995** is for high-pressure boiler tubes, used in power plants and nuclear facilities. Materials like 20G, 12Cr1MoVG, and 15CrMoG are common.
- **GB 5312-1999** applies to ship-grade seamless tubes, used in ship boilers and superheaters. Materials such as 360, 410, and 460 are typical.
- **GB 1479-2000** is for high-pressure fertilizer equipment, used in chemical plants. Common materials include 20#, 16Mn, and 12CrMo.
- **GB 9948-1988** is for petroleum cracking tubes, used in refineries. Materials like 20#, 12CrMo, and 1Cr5Mo are frequently used.
- **GB 18248-2000** is for gas cylinder tubes, used in gas and hydraulic cylinders. Materials such as 37Mn, 34Mn2V, and 35CrMo are common.
- **GB/T 17396-1998** is for hydraulic props, used in coal mines. Materials like 20#, 45#, and 27SiMn are standard.
- **GB 3093-1986** is for diesel engine high-pressure oil pipes, typically cold-drawn. Material like 20A is commonly used.
- **GB/T 3639-1983** is for precision cold-drawn seamless tubes, used in machinery and pressure equipment. Materials like 20#, 45# are typical.
- **GB/T 3094-1986** is for shaped cold-drawn tubes, used in structural components. High-quality carbon and low-alloy steels are used.
- **GB/T 8713-1988** is for precision inner diameter tubes used in hydraulic and pneumatic cylinders. Materials like 20#, 45# are common.
- **GB 13296-1991** is for stainless steel tubes used in boilers and heat exchangers. Materials like 0Cr18Ni9, 1Cr18Ni9Ti, and 0Cr18Ni12Mo2Ti are used.
- **GB/T 14975-1994** is for stainless steel tubes used in general structures. Materials like 0-3Cr13, 0Cr18Ni9, and 1Cr18Ni9Ti are common.
- **GB/T 14976-1994** is for stainless steel tubes used in corrosive environments. Materials like 0Cr13, 0Cr18Ni9, and 0Cr17Ni12Mo2 are typical.
- **YB/T 5035-1993** is for automotive axle sleeves, made from high-quality carbon and alloy steels. Materials like 45#, 45Mn2, and 40Cr are used.
For more information about seamless steel pipes, visit the 51 Steel Pipe Network. Learn more: http://?id=3
Elevator Switch Or Sensor,Host To Host,Host Brake Switch,Elevator Microswitch
Suzhou FUJI Precision Elevator Co.,Ltd , https://www.profuji.com