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为了提高发电机的发电效率,进一步使发电机轻量化和小型化,要求开发发电机保持环用的高强度无磁材料,以便减小保持环的尺寸和质量。为此,日本制钢公司开发成功一种含氮很高的高强度无磁不锈钢,其成分为(％):C<0.2,Si<1.0,Mn 15～25,Ni<1,Cr 15～25,N 0.4～1.0,并进一步添加V 0.02～0.15,Nb 0.02～0.15中的至少一种元素,其余为铁和难免杂质。 该新钢种是在耐应力腐蚀破裂性优良的传统无磁不锈钢18Mn-18Cr-N基础上,通过单独或复合添加适量的固溶强化元素钒和铌,而达到高强度化的目的,并且保持了传统钢优良的无磁特性。氮是本发明钢中特别重要的元素、固溶于奥氏体相中,有效地提高钢的强度和耐应力腐蚀破裂性,氮少于0.4％则
In order to increase the power generation efficiency of the generator and further reduce the weight and size of the generator, it is required to develop a high strength non-magnetic material for a generator retaining ring in order to reduce the size and the quality of the retaining ring. To this end, the Japanese steel company successfully developed a nitrogen-containing high strength non-magnetic stainless steel, and its composition (%): C <0.2, Si <1.0, Mn 15 ~ 25, Ni <1, Cr 15 ~ 25 , N 0.4 to 1.0, and further adding at least one element of V 0.02 to 0.15 and Nb 0.02 to 0.15, with the balance of iron and unavoidable impurities. The new steel is based on the conventional non-magnetic stainless steel 18Mn-18Cr-N which is excellent in stress corrosion cracking resistance and achieves the purpose of high strength by adding appropriate amount of solid solution strengthening elements vanadium and niobium alone or in combination The excellent non-magnetic properties of traditional steel. Nitrogen is a particularly important element in the steel of the present invention and is solid-solubilized in the austenite phase, effectively increasing the strength and stress corrosion cracking resistance of the steel. When the nitrogen content is less than 0.4%