What are the main types of cold drawn seamless steel tube and hot rolled seamless steel tube

The seamless steel tube is made of steel ingot or solid tube blank by piercing, then hot rolling, cold rolling or cold drawing. The specification of seamless steel tube is expressed in mm of outer diameter * wall thickness. Seamless steel tube is divided into cold rolled (drawn) seamless steel tube and hot rolled seamless steel tube.

Hot rolled seamless steel tube:
Hot rolled seamless steel tube is divided into general steel tube, low and medium pressure boiler steel tube, high pressure boiler steel tube, alloy steel tube, stainless steel tube, petroleum cracking tube, geological steel tube and other steel tubes.

Cold rolled (drawn) seamless steel tube:
Other than general steel tube, low and medium pressure boiler steel tube, high pressure boiler steel tube, alloy steel tube, stainless steel tube, petroleum cracking tube and other steel tubes, the cold rolled (drawn) seamless steel tube also includes carbon thin-walled steel tube, alloy thin-walled steel tube, stainless steel tube and special-shaped steel tube.