Hot Rolling Method: After heating the steel billet to a certain temperature, it is rolled on a rolling mill to gradually deform the steel billet into a tube shape. This method is suitable for the production of large-diameter and thick-walled steel pipes, with a rough surface, coarse internal grains, relatively low strength, but good toughness.
Cold Drawing Method: The annealed steel billet is placed in a cold drawing machine for drawing, and the steel pipe diameter is gradually refined and the wall thickness is reduced. The surface is smooth, and the strength and toughness are correspondingly improved. It is suitable for the production of precision steel pipes and high-precision mechanical parts.
Cold Extrusion Method: The steel billet is placed in a cold extruder for extrusion, and it is deformed into a steel pipe. This method has high processing accuracy, smooth surface, and good linearity, but the steel pipe wall is thin and cannot withstand large external loads.
Welding Method: The cut and formed steel plates are connected into a tube shape through welding technology. It is suitable for the production of steel pipes of various specifications, with advantages such as high strength and good surface flatness.
Seamless steel pipe production method: Use round steel as raw material, perform multiple perforations and heat forming on a rolling mill. Seamless steel pipes have smooth inner and outer surfaces, high processing precision, high strength, and uniform and stable internal quality. They are suitable for the production of high-pressure, large-diameter steel pipes, such as oil and natural gas pipelines.
