(1) Introduction to seamless steel pipe materials:
GB/T8162-2008 (seamless steel pipe for structural use). Mainly used for general structures and mechanical structures. Its representative materials (grades): carbon steel No. 20, No. 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
GB/T8163-1999 (seamless steel pipe for transporting fluids). Mainly used for conveying fluid pipelines in engineering and large-scale equipment. Representative materials (grades) are 20, Q345, etc.
GB3087-2008 (seamless steel pipe for low and medium pressure boilers). Mainly used in pipelines for conveying low and medium pressure fluids in industrial boilers and domestic boilers. The representative materials are No. 10 and No. 20 steel.
GB/T17396-2009 (hot-rolled seamless steel pipe for hydraulic props). It is mainly used to make hydraulic supports, cylinders and columns in coal mines, as well as other hydraulic cylinders and columns. Its representative materials are 20, 45, 27SiMn, etc.
(2) Uses of seamless steel pipes: 1. Construction-type pipes include: underground pipes for transportation, groundwater extraction when building buildings, boiler hot water transportation, etc. 2. Mechanical processing, bearing sleeves, processing machinery accessories, etc. 3. Electrical: gas transmission, water power generation fluid pipelines. 4. Anti-static pipes for wind power plants, etc.