提高18Mn—18Cr—N扩环钢中氮含量及收得率的研究

护环作为发电机一个最关键的零件，由于其所起的作用及受力状态决定了要求超高的强度、良好的塑韧性、无磁性及优秀的抗应力腐蚀的能力，为了提高制造18Mn-18Cr-n护环的强度等级，经分析认为提高护环钢中的氮含量是一个关键的因素，在对影响18Mn-18Cr-N钢中氮含量的因素进行分析研究及实验室小感应炉的模拟实验的基础上，编制出冶炼工艺，并在电炉上进行了6炉次的实践，钢中的氮含量达到了0.69%，氮的收得率最高达到71%，大大高于常规工艺方法的水平，达到了日本制钢所室兰工厂该钢种的氮含量水平。

Research on improving N content and recovery factor of 18Mn18CrN steel for Retaining Ring

Retaining ring is a most critical part of electric generator, it shall have super - high strength, good ductility and toughness, antiraagnetic and excellent resistance to stress corrosion because of its function and stressed state. Analysis result shows that the increase of N content is a key factor of im-proving the strength Ievel of 18Mn18CrN retaining ring manufactured. On the basis of analyzing and re-searching on the factor influencing N content in 18Mn18CrN steel, the melting process has been prepared, the simulation test has been taken. the test result shows that N content in steel is up to 0. 69% . N recovery ratio is up to 71% , it is vastly higher than the level of conventional melting process method.