GB/T 5310 is a kind of boiler tube.

Its representative material is 20g, 20mng, 25mng. It is a medium carbon steel with less manganese.

The delivery length of boiler tube is divided into two kinds: fixed size and double size. The unit price of each domestic tube is calculated according to the specified length, and the price of each tube is calculated according to the actual weight.

Double scale can be divided into three kinds:

Short ruler: used to fix the special seamless steel pipe on the support;

Equal wall thickness special-shaped seamless steel pipe (outer diameter less than 32mm) : used for mechanical structure, hydraulic equipment with high dimensional accuracy and good surface finish of precision seamless steel pipe; 

Non-standard seamless steel pipe (outer diameter greater than 32mm or inner diameter less than 40mm) : Used for various structural parts, tools and mechanical parts.