Shaped seamless steel pipe plays a vital role in urban construction. Its quality directly affects the solidity and quality of living buildings. In order to choose a high-quality square tube in the square tube market of fish-eye mixing, first Learn to identify inferior square tubes seamless steel pipe supplier.

Seamless steel tubes are divided into hot-rolled (extruded) seamless steel tubes and cold drawn (rolled) seamless steel tubes due to their different manufacturing processes. Cold drawn (rolled) tubes are divided into two types: round tubes and shaped tubes. Seamless steel pipes are also divided into the following varieties due to their different uses:

1.Structural seamless steel pipe (GBT8162-2008). Mainly used for general structural and mechanical structures. Its representative material (brand): carbon steel, 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo and so on.

2.Carbon steel and carbon-manganese steel seamless steel tubes for ships (GB/T 5312-2009) are applicable to the manufacture of Class I pressure piping systems for ships, Class II pressure piping systems, carbon steel and carbon for boilers and superheaters. Manganese steel seamless steel pipe. The seamless pipe for pressure piping is divided into three levels according to design pressure and design temperature. The working temperature of the seamless steel pipe wall for boilers and superheaters shall not exceed 450 °C.

3.High-pressure oil pipe for diesel engine (GB3093-86) is a cold drawn seamless steel pipe for the manufacture of high-pressure pipes for diesel injection systems.

4.Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders (GB8713-88) is a cold drawn or cold rolled precision seamless steel pipe with precision inner diameter for the manufacture of hydraulic and pneumatic cylinders.

5.Cold drawn or cold rolled precision seamless steel pipe (GB3639-83) is a cold drawn or cold rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. The use of precision seamless steel tubes to manufacture mechanical structures or hydraulic equipment can greatly reduce machining time, improve material utilization, and improve product quality.

6.Seamless steel pipe for conveying fluid (GBT8163-2008). Mainly used for conveying fluid pipelines on engineering and large equipment. The representative material (brand) is 20, Q345, etc.

7.Seamless steel pipe for low and medium pressure boilers (GB3087-2008) is used for the manufacture of superheated steam pipes, boiling water pipes and locomotive boiler superheated steam pipes, large smoke pipes, small smoke pipes and arch bricks for various structural low and medium pressure boilers. Hot-rolled and cold-drawn (rolled) seamless steel tubes of high-quality carbon structural steel for pipe use. The representative material is steel No. 10 and No. 20.

8.Seamless steel pipe for high-pressure boiler (GB5310-2008) is a high-quality carbon steel, alloy steel and stainless steel heat-resistant steel seamless pipe for the heating surface of water tube boilers for high pressure and above. Representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.

9.Seamless steel pipe for high-pressure fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with working temperature of -40~400 °C and working pressure of 10~30Ma. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo and the like.

10.Seamless steel pipe for petroleum cracking (GB9948-2006). Mainly used in boilers, heat exchangers and pipelines for transporting fluids in petroleum smelters. The representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb and the like.

11.Steel pipe for geological drilling (YB235-70) is a steel pipe used for geological drilling by the geological department. It can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe according to the application.steel pipes manufacturer

12.Seamless core steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe for drill pipe, core rod and casing used for diamond core drilling.

13.Oil Drilling Pipe (YB528-65) is a seamless steel pipe used for thickening or external thickening at both ends of oil drilling. There are two kinds of steel pipe and no wire, the wire pipe is connected by a joint, and the non-wire pipe is welded by a butt welding method and a tool joint.

14.Seamless steel pipe for automobile semi-axle casing (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe for automobile semi-axle casing and axle axle of drive axle.