Seamless steel pipe has a hollow section, a large number of fluid pipeline, such as the transportation of oil, natural gas, gas, water and some solid materials pipeline.
Seamless steel pipe is mostly medium and high carbon alloy steels. After quenching, some of the supercooled austenite has not been converted into martensite, and remains in use as residual austenite, affecting the service performance. If it is cooled below zero, it can promote martensite transformation of the residual austenite.
Therefore, the essence of cold treatment is to continue quenching. Quenching stress at room temperature and quenching stress at zero degree superposition, when the stack response force exceeds the strength limit of the material, the cold treatment crack will be formed.
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