Why can nickel-based welding materials be used for chromium-molybdenum steel without heat treatment?
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SH/T 3520-2015, \"Welding Specifications for Chromium-Molybdenum Steels in the Petrochemical Industry,\" stipulates that when on-site construction conditions prevent the performance of post-weld heat treatment, welding with austenitic or nickel-based materials may be used, with the approval of the designer or the project owner. Nickel-based materials can be selected when the design temperature is above 315°C. ” I wonder why that’s possible. Are there many situations where this can be applied?
The welds of austenitic welding materials and nickel-based welding materials consist mainly of austenite, and post-weld heat treatment is generally not required.
Nickel-based welding materials are characterized by good flexibility, low weld stress, and reduced tendency to crack; they can also be used for welding cast iron.