Welding of chromium-molybdenum alloy steel
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Under what circumstances is preheating required when welding chromium-molybdenum alloy steel, and are there any requirements for post-weld heat treatment?
For different steel grades and thicknesses, the construction acceptance specifications can be referred to, such as GB50235 SH3501
Chromomolybdenum alloy steel requires preheating during welding to ensure weld quality； When it is necessary to ensure welding quality, post-weld heat treatment is required
If there are corresponding chemical industry standards, you can refer to those for comparison.
Consider the steel grade and wall thickness: the higher the alloy content, the thinner the preheating wall thickness, and the higher the preheating temperature