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Stainless steel pipe now more and more widely used, due to its good corrosion resistance has played a vital role in engineering construction, in the process of production we need a solid solution for stainless steel tube processing, the main purpose is to obtain certain martensite increase the hardness of products, let's look at the solution of the stainless steel tube processing:
(1) after solution treatment and then heated to (760±15) ℃ for 90min, the carbon and alloying element content in the austenitic 904L stainless steel tube was reduced due to the precipitation of Cr23C6 carbides from the austenite. The Ms point was raised to 70℃ and then cooled to room temperature to obtain martensite +α ferrite + residual austenite structure. The residual austenite was decomposed after aging at 510℃.
(2) after solution by high temperature adjustment and cryogenic treatment, the solution is heated to 950℃ for 90min. Due to the increase of Ms point, a small amount of martensite can be obtained by cooling to room temperature. A certain amount of martensite can be obtained after cold treatment at -70℃ for 8h.
(3) After solution treatment by cold deformation method, the amount of martensite formed by 904L seamless tube during cold deformation is related to deformation and composition of 904L stainless steel tube.
The above three methods are commonly used for solution treatment of stainless steel tubes. I hope to help you.