Seamless steel pipe is expressed by outer diameter, wall thickness and thick wall seamless steel pipe, which is mainly used for mechanical processing, coal mine, hydraulic steel, and other purposes. According to its use, it can be divided into structural seamless steel pipe, boiler seamless high-pressure steel pipe, fertilizer equipment seamless high-pressure steel pipe, transportation seamless steel pipe, boiler seamless steel pipe, geological brick seamless steel pipe, oil brick seamless steel pipe, cold-drawn cold-rolled precision seamless steel pipe, oil cracking seamless steel pipe, marine seamless steel. Pipe; all kinds of alloy pipes.
The production process can be divided into four basic modes: cold drawing, cold rolling, hot rolling and hot expansion. The material of steel pipe is 10, 20, 35, 45, 16Mn is called low alloy steel pipe between ordinary steel pipe and alloy steel pipe. The material of steel pipe is 27SiMn, 12Cr1MoV, 10CrMo910, 15CrMo, 35CrMo and stainless steel. Tubes are collectively referred to as alloy steel tubes.