17-4PH不锈钢管件热切割和焊接加工裂纹分析

    Analysis of Cracking Occurring in Hot Cutting and Welding Processing of 17-4PH Stainless Steel Pipe Fitting

    • 摘要: 17-4PH马氏体沉淀硬化不锈钢因具有较低碳含量、中等Ni含量和热处理后韧性较好的细板条状时效马氏体组织,本应在热加工状态下表现出较好的热切割和焊接性。但在实际热加工过程中,该材料在高能率热切割和施焊时却极易出现裂纹缺陷。通过分析17-4PH不锈钢等离子热切割和焊接生产过程裂纹产生原理,跟踪追溯分析工件热加工过程,找到了17-4PH钢在热切割和焊接过程中产生裂纹的原因,并采取相应措施避免了17-4PH不锈钢热切割和焊接裂纹的产生。

       

      Abstract: Due to having low C content,medium Ni content and fine lath ageing martensite with proper post-heat treatment toughness,the 17-4PH martensite precipitation-hardened stainless steel should have presented fine hot-cutting ability and weldibility in the hot-working state. However during the actual hot-working process,this steel is prone to develop crack defects when being subjected to hi-energy rate hot-cutting and welding. Thanks to analyzing the principle of occurrence of cracks with the said 17-4PH stainless steel during the plasma hot-cutting process and the welding operation,the hot-process of the work piece is traced and analyzed,and then causes for occurrence of cracks with the said stainless steel during the above mentioned hot-cutting and welding processes are identified. Accordingly relevant measures have been taken to get the said cracks avoided.

       

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