Solid solution treatment of stainless steel pipes

Release time:

2022-09-16

The intermediate aging method is heated to (760±15)℃ after solid solution treatment and kept for 90 minutes. Because Cr23C6 carbide precipitates from the austenite, the carbon and alloy element content in the austenitic 904L stainless steel pipe is reduced. , raise the Ms point to 70°C and then cool to room temperature to obtain the martensite + α ferrite + retained austenite structure. The residual austenite will be decomposed after subsequent aging at 510°C.

The use of stainless steel pipes is becoming more and more widespread. Due to 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 a certain degree of corrosion resistance. Martensite increases the hardness of the product. Let’s look at the solid solution treatment of stainless steel pipes:
(1) The intermediate aging method is heated to (760±15)℃ after solid solution treatment and kept for 90 minutes. Because Cr23C6 carbide precipitates from the austenite, the carbon and alloy element content in the austenitic 904L stainless steel pipe is reduced. , raise the Ms point to 70°C and then cool to room temperature to obtain the martensite + α ferrite + retained austenite structure. The residual austenite will be decomposed after subsequent aging at 510°C.
(2) High temperature adjustment and cryogenic treatment method: After solid solution, it is first heated to 950°C and kept for 90 minutes. Due to the increase in the Ms point, a small amount of martensite can be obtained by cooling to room temperature; then, a certain amount of martensite can be obtained by cold treatment at -70°C and kept for 8 hours. Amount of martensite.
(3) After solution treatment by cold deformation method, cold deformation is performed at room temperature. The amount of martensite formed in the 904L seamless pipe during cold deformation is related to the amount of deformation and the composition of the 904L stainless steel pipe.

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Solid solution treatment of stainless steel pipes

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