Seamless pipe is divided into hot rolled pipe, cold rolled pipe, cold drawn pipe, kneading pipe, jacking pipe, etc., according to different production methods, all have their own process provisions.Materials are general and high quality carbon structural steel (Q215-A ~ Q275-A and no. 10 ~ 50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, rust resistant acid steel, etc.According to the use is divided into general use (for water, gas pipelines and structural parts, mechanical parts) and special (for boiler, geological exploration, bearing, acid resistance, etc.) two categories.

Seamless works in a wide range of ways.The general use of seamless pipe by general carbon structural steel, low alloy structural steel or alloy structural steel rolling, production is the most, mainly used for transporting fluid pipeline or structural parts.2, according to the use of different types of supply: a, according to the chemical composition and mechanical properties of supply;B. Supply according to mechanical properties;C. Supply according to water pressure test.The steel pipes supplied according to class A and B, if used to withstand liquid pressure, shall also be subjected to hydrostatic test.3, specialized seamless tube with boiler seamless pipe, chemical power, geological seamless pipe and oil seamless pipe and so on.

Seamless pipe has a hollow section, many used for transporting fluid pipelines, such as transporting oil, natural gas, gas, water and some solid material pipelines.Compared with solid steel such as round steel, steel tube has the same bending and torsional strength and lighter weight, so it is a kind of economic section steel.

It is widely used in the production of structural parts and mechanical parts, such as oil drill pipe, car drive shaft, bicycle frame and steel scaffolding used in construction and other circular parts made of steel pipe, which can improve the utilization rate of data, simplify the production process, save data and processing time, and has been widely used in the production of steel pipe.

The mechanical properties of steel, which depend on the chemical composition of steel and the heat treatment criteria, are important objectives to ensure the ultimate performance of steel.In the steel pipe specification, according to different application requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, tolerance targets, as well as high and low temperature properties required by users.