The cold rolling of seamless tube and steel tube transforms martensite into seamless tube and steel tube before the rolled piece enters the finishing rolling extruder. Rough rolling is still carried out under full martensite conditions.

The application range of seamless steel pipes is getting wider and wider. In the whole process of applying seamless steel pipes, how should people keep the level of seamless steel pipes unchanged?

The production process of hot-rolled high-pressure seamless pipe is to pierce and roll a solid pipe billet or steel ingot into a seamless pipe that meets the product standard.

Polyurethane insulation steel pipe is currently the most widely used insulation steel pipe product under low pressure. It is mainly suitable for transporting hot and cold water, etc.

People treat this two-phase structure composed of a specific ratio as a kind of organization and named it pearlite. This kind of steel is called eutectoid steel. That is, steel with a carbon content of exactly 0.77% is called eutectoid steel, and its structure is pearlite.　

The precision steel pipe has high dimensional accuracy and high finish, the inner and outer surfaces of the pipe have no oxide film after heat treatment.