Does stainless steel undergo post-weld heat treatment?
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I would like to ask friends whether post-weld heat treatment is required for pressure vessels made of austenitic stainless steel?
Brother, ferrite will appear in this way, causing embrittlement.
Stainless steel generally does not undergo post-weld heat treatment~
Article 74 of the "Capacity Regulations" generally does not require heat treatment for austenitic stainless steel or non-ferrous metal pressure vessels after welding. If there are special requirements for heat treatment, it should be noted on the drawing. GB15010.4.2.2 Unless otherwise specified in the drawing, cold-formed austenitic stainless steel heads are not heat treated.
Stainless steel does not need post-weld heat treatment, but if there are special requirements for heat treatment, it should be indicated on the drawing. (Article 74 of the Specifications)
Generally it is not done. If it is done, solution treatment is required, and attention should be paid to preventing deformation of the equipment during heat treatment.
It’s better to look at what may be contained in the container in the future. If there are hydrogen atoms, it’s best to deal with them.
Generally not required, if so, solution treatment is required.
Under normal circumstances, no heat treatment is required, which is stipulated in Article 74 of the "Conformance Regulations": Austenitic stainless steel or non-ferrous metal pressure vessels are generally not required to undergo heat treatment after welding. If there are special requirements for heat treatment, this should be noted on the drawing. GB15010.4.2.2 stipulates the head: Unless otherwise specified in the drawing, cold formed austenitic stainless steel heads are not heat treated.
Thanks for everyone's help, I learned a lot!
Why do we need to do it if there are hydrogen atoms?
How to raise this question? Stainless steel is generally not heat treated. Unless the raw material has not been solid solution treated and needs to be remade, or the original solid solution state has been changed by hot forming and needs to be re-solubilized. Stainless steel itself has good hydrogen resistance. And it is not a property that can be acquired after heat treatment.
Is it possible to quickly cool the welds of austenitic stainless steel pressure vessels with water after welding? Will it cause defects?
We have never come into contact with stainless steel equipment that requires heat treatment~~ Haha
Generally this is not done. If it is done, solution treatment is required. Welding stainless steel can be quenched with water.
Generally, heat treatment is not required. As you mentioned above in the standard, if the drawing requires it, then it must be done. Most of them are solid solution treatment, and stabilization treatment, solid solution treatment.: Austenitic stainless steel is heated to about 1100 and kept warm to allow the carbides to fully penetrate into the austenite, and then cooled quickly to avoid coarse grains and stabilize them.: For austenitic stainless steel containing stabilizing elements (Ti/V, etc.), heat it to 850-900, keep it warm, and air-cool or water-cool. A friend upstairs asked whether water-cooling can be used when welding stainless steel. Yes, it will generally not cause defects.