Generally, according to the different uses and working conditions of the steel pipe, different technical conditions should be proposed for the allowable deviation of the steel pipe size, surface quality, chemical composition, mechanical properties, process performance and other special properties.

The data of Brinell hardness measurement is accurate and stable, and it is suitable for detecting unquenched seamless steel pipes, cast iron steel pipes, non-ferrous metals or light and soft bearing alloy steel pipes.

Cold rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, as well as carbon thin-walled steel pipes and alloy thin-walled steel pipes.

The strength of thick-walled spiral steel pipes is generally higher than that of large-diameter straight seam steel pipes.

Seamless steel pipe penetration testing has simple principles, flexible methods, and strong adaptability. It can detect surface opening defects in any direction at one time.

The characteristics of plastic-coated composite steel pipe: It not only has the strength of steel pipe, but also has the advantages of plastic pipe corrosion resistance, wear resistance, and low fluid resistance. It is a new type of water supply and anticorrosion pipeline.