The use of stainless steel pipes is now more and more widely used. Because of its good corrosion resistance, it plays a vital role in engineering construction. During the production process, we need to perform solid solution treatment on stainless steel pipes. The main purpose is to obtain certain Martensite increases the hardness of the product. Let's look at the solid solution treatment of stainless steel pipes below:
(1) Intermediate aging method heats to (760±15) degree after solution treatment, keeps holding for 90min, because Cr23C6 carbide precipitates from austenite, which reduces the content of carbon and alloying elements in the austenitic 904L stainless steel tube , The Ms point is raised to 70 degree and then cooled to room temperature to obtain martensite plus ferrite plus retained austenite structure, and the retained austenite is decomposed after aging at 510 degree .
(2) Po úprave vysokej teploty a kryogénnom spracovaní zahrejte na 950 stupňov a podržte 90 minút po tuhom roztoku. Pretože bod Ms je zvýšený, malé množstvo martenzitu možno získať ochladením na izbovú teplotu; potom sa môže získať spracovaním za studena pri -70 stupňoch a držaním počas 8 hodín. Množstvo martenzitu.
(3) After the cold deformation method and solution treatment, it is cold deformed at room temperature. The amount of martensite formed in the 904L seamless tube during cold deformation is related to the deformation and the composition of the 904L stainless steel tube.
The above three methods are commonly used methods of solid solution treatment of stainless steel pipes. Hope to help everyone.