Questions regarding the post-heat treatment of low-alloy steel
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The national standards specify that for low-alloy steel, if post-weld heat treatment cannot be carried out promptly, pre-heating at 200–350°C is required first. I checked some ASME standards, but found no mention of post-heating; does this mean that low-alloy steel products manufactured according to ASME standards do not need to undergo post-heating? I hope the experienced folks here will be kind enough to share their insights!
The main purpose of post-heat treatment is to remove hydrogen, as detailed in ASME’s Welding Section.
Are you referring to the welding section in ASME IX \"Evaluation of Welding and Brazing\", or some other standard? I couldn’t find any information on post-weld heat treatment in ASME IX. Could you please specify which clause it is? Thank you very much :)
Your statement is reversed; it should be: in welding processes where post-heating is required, it must be carried out, while it isn’t necessary in those cases where it’s not required. For those that require post-heat treatment, if the post-heat treatment is carried out immediately after welding, it may not be necessary to perform post-heat treatment.
Please refer to Section C of ASME II, and Appendix A of SAF-5.1.