Thick wall welded pipe manufacturing process

　　The manufacturing process of thick-walled welded pipe production can be divided into three basic methods: cold drawing, cold rolling and hot rolling. The material of steel pipe is 10#, 20#, 35#, 45# is called ordinary steel pipe, 16Mn is called low alloy steel pipes, and the steel pipes are made of 27SiMn, 12Cr1MoV, 10CrMo910, 15CrMo, 35CrMo and stainless steel pipes, which are collectively referred to as alloy steel pipes. According to the use, it is divided into structural seamless steel pipe, seamless steel pipe for transportation, seamless steel pipe for boiler, high-pressure seamless steel pipe for boiler; high-pressure seamless steel pipe for fertilizer equipment, seamless steel pipe for geological brick exploration, Seam steel pipe, seamless steel pipe for petroleum cracking, seamless steel pipe for ships, cold drawn cold-rolled precision seamless steel pipe, various alloy pipes.

　　The API seamless steel pipe is expressed by the method of outer diameter, wall thickness and thick-walled seamless steel pipe, which are mainly used for machining, coal mine, hydraulic steel, and the like. Thick-walled seamless steel pipe classification - hot-rolled thick-walled seamless steel pipe, cold-rolled thick-walled seamless steel pipe, cold-drawn thick-walled seamless steel pipe, extruded thick-walled seamless steel pipe, stainless steel seamless pipe for pipe jacking structure (GB /T14975-1994) is a hot-rolled (extruded, expanded) and cold drawn (rolled) stainless steel made of corrosion-resistant pipes and structural parts and parts widely used in the chemical, petroleum, textile, medical, food, machinery and other industries. Seamless steel pipe. The stainless steel seamless pipe for fluid transportation (GB/T14976-1994) is a hot-rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipe made of stainless steel for conveying fluid.

　　Shaped seamless steel pipe is a general term for API seamless steel pipes of other cross-section shapes other than round pipes. According to the shape and size of the cross-section of the steel pipe, it can be divided into the same wall thickness profiled seamless steel pipe (code D), the unequal wall thickness profiled seamless steel pipe (code BD), and the variable diameter profiled seamless steel pipe (code BJ). Shaped seamless steel tubes are widely used in a variety of structural parts, tools and mechanical parts. Compared with the round pipe, the special-shaped pipe generally has a large moment of inertia and a section modulus, and has a large bending and torsion resistance, which can greatly reduce the structural weight and save steel.

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