(1)研究目的 动力工业用奥氏体耐热钢管材,可能发生蒸汽腐蝕所导致的晶间破坏。配合发展不含镍的铬锰氮奥氏体耐热钢,对于这种新型耐热钢晶间腐蝕行为的研究是完全必要的。 各种晶间腐蚀的理论都承认品间腐蚀是由于晶间的析出物所引起的。对于铬镍奥氏体不锈耐热钢来看,这种晶间析出物是碳化铬。从控制碳化铬析出现像考虑,降低及避免铬镍奥氏体不銹耐热钢晶间腐蚀趋势的措施有下列七种: (1) Research purposes Austenitic heat-resistant steel pipe for power industry may cause intergranular damage caused by steam corrosion. With the development of non-nickel chromium-manganese nitrogen austenitic heat-resistant steel, for this new heat-resistant steel intergranular corrosion behavior is completely necessary. Various theories of intergranular corrosion have all admitted that the intergranular corrosion is caused by the intergranular precipitates. Chromium-nickel austenitic stainless heat-resistant steel point of view, this intergranular precipitation is chromium carbide. From the control of chromium carbide precipitation phenomenon considered, to reduce and avoid chrome-nickel austenitic stainless steel heat-resistant steel intergranular corrosion trend of the following seven measures: