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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。
Ring as a generator of the most critical parts, due to its role and the state of stress determines the requirements of ultra-high strength, good plasticity and toughness, non-magnetic and excellent resistance to stress corrosion. In order to increase the strength rating of the 18Mn-18Cr-N grommet, it was analyzed that increasing the nitrogen content in the grommet is a key factor. Based on the analysis of the factors influencing the nitrogen content in 18Mn-18Cr-N steel and the simulation experiment of the laboratory small induction furnace, a smelting process was prepared and carried out 6 times of practice on the electric furnace. Nitrogen content reached 0.69%, nitrogen yield up to 71%, much higher than the conventional process methods to achieve the level of nitrogen content of the steel plant in Japan Sulan factory.