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在核级奥氏体不锈钢无缝钢管晶间腐蚀试验的基础上,结合该不锈钢无缝钢管的生产制造工艺和敏化热处理过程,分析得出该无缝钢管在敏化热处理后的微观组织为γ奥氏体+δ铁素体+M23C6碳化物,M23C6碳化物大量析出而造成的晶界贫Cr是晶间腐蚀试验不合格的主要原因,且δ铁素体的存在对该核级奥氏体不锈钢无缝钢管的耐晶间腐蚀性存在不利影响。为保证该类型核级奥氏体不锈钢无缝钢管的晶间腐蚀性能,建议在满足化学成分设计要求的前提下优化元素含量配置和采取更为优异的固溶热处理制度。
Based on the intergranular corrosion test of austenitic stainless steel seamless tube and the production process and sensitization heat treatment process of the seamless steel tube, the microstructure of the seamless steel tube after sensitized heat treatment is γ austenite + δ ferrite + M23C6 carbide, M23C6 carbide precipitation caused by a large number of grain boundary Cr-poor intergranular corrosion test is the main reason for failure, and the presence of δ ferrite on the nuclear grade austenitic Body stainless steel seamless pipe resistance to intergranular corrosion is adversely affected. In order to ensure the intergranular corrosion performance of this type of austenitic stainless steel seamless pipe, it is suggested that the elemental content should be optimized and the solution heat treatment system should be optimized to meet the design requirements of chemical composition.