pressure vessel is a comprehensive product involving many industries and many disciplines, and its construction technology involves many industries, such as metallurgy, mechanical processing, corrosion and corrosion protection, nondestructive testing, safety protection and so on. widely used in chemical, petroleum, machinery, power, metallurgy, nuclear power, aviation, aerospace, marine and other departments. most of the pressure vessels are made of steel, all of which are used to have excellent properties, including mechanical properties, corrosion resistance, high temperature resistance and production processes, etc..