Cold-rolled seamless steel pipes are cold-drawn or cold rolled precision seamless steel pipes, with high accuracy of the dimension and good finish of the surface. They are often used for machinery and hydraulic equipment.

The cold-rolled process refers to the method adopted to process the steel plates or strips into various types of steel products by cold working processes. Such as the cold bend and cold drawn processes. Cold-rolled seamless steel pipes include general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking steel pipes. The cold-rolled pipes generally have a high dimensional accuracy than the hot-rolled pipes.

Advantages

1. The speed of molding and productivity is high. The coating will not be damaged. The sections can be made in various shapes so as to adapt to different conditions. Cold rolled processes can make steel have great plastic deformation so as to increase the yield point of steel.

2. Cold rolled processes can destroy the casting structure of steel ingots, refine the grain of steel products and eliminate the defects of microstructure so as to make the structure of steel products compact and improve the mechanical property of steel products. This kind of improvement reflects mainly along the rolling direction, which makes steel products not isotropic bodies any longer to some extent. Bubbles, cracks, and shrinkage formed in casting can be repaired under the effects of high temperatures and pressure.

Disadvantages

1. The section of cold-rolled steel in the open section generally, which has relatively low free torsion stiffness. The steel is twisted easily when it is bent; flexural-torsional buckling showed up easily when steel is pressed. The torsion resistance is relatively poor.

2. The wall of the cold-rolled steel pipe is relatively thin. The corners connecting plates are not thickened. The bearing ability of the partial concentrated load is weak.