Is post-weld heat treatment required for 15CrMo pipes?
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Hi Hai, I encountered 15CrMo pipes in a project. According to standard 50235, no heat treatment is required for these pipes, but the quality control team believes that heat treatment is necessary. Has anyone else run into this issue? How should it be handled?
Chromomolybdenum steel requires preheating before welding, and heat treatment must be carried out after welding. If left untreated, cracks are likely to form at high temperatures.
According to the standards, there should be requirements regarding thickness; unless stress corrosion and delayed cracking are involved, thickness requirements do apply in other operating conditions
No standards were seen. Our company requires heat treatment for chromium-molybdenum steel welding, regardless of thickness.
GB150 specifies this; there are other requirements for pipes