Seamless steel pipes are divided into two categories: hot rolled seamless steel pipes and cold rolled (dial) seamless steel pipes.

Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes. In addition to the general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, also includes carbon thin-wall steel pipe, alloy thin-wall steel pipe, stainless thin-wall steel pipe, special-shaped steel pipe. The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness is 2.5-75mm, the diameter of the cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be up to 0.25mm, the outer diameter of the thin-walled pipe can be up to 5mm, the wall thickness is less than 0.25mm, and the size accuracy is higher than that of the hot-rolled seamless pipe.

Generally used seamless steel pipe: is made of 10, 20, 30, 35, 45 carbon junction steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolled or cold rolled. Seamless steel pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transportation pipelines. 45, 40Cr and other seamless steel pipes made of medium carbon steel are used to manufacture mechanical parts, such as the stressed parts of automobiles and tractors. Generally use seamless steel pipe to ensure the strength and flattening test. Hot-rolled seamless steel pipes are delivered in hot-rolled or heat-treated state; Cold-rolled seamless steel pipes are delivered in heat-treated condition.

Seamless steel pipe weight calculation formula :[(outer diameter - wall thickness)* wall thickness]*0.02466=kg/ m (per meter weight if you want to obtain a small size and quality seamless pipe,