17Cr-7Ni 鋼の粒界腐食特性および機械的性質におよぼす C, N, Ni および調質圧延の影響

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A study has been made of the influence of C, N and Ni contents and temper rolling on intergranular corrosion and mechanical properties of a 17Cr-7Ni steel, in order to develop a high strength stainless steel with high corrosion resistance. The results obtained are as follows : (1) Intergranular corrosion sensitivity increases with increasing C content or temper rolling reduction. (2) 0.2% proof stress of annealed materials increases with increasing (C+2N) content. Tensile stress decreases with increasing stability of austenite phase, and increases with increasing C or N content in the case of the same austenite stability. Elongation increases with increasing austenite stability. (3) The influence of C, N and Ni contents on the tensile properties of 25% temper rolled materials is similar to that on annealed materials and 0.2% proof stress increases with (2C+N) content. (4) The strengths of austenite and martensite phase increase with increasing C or N content. The effect of C content is smaller in austenite phase and is larger in martensite phase compared with the effect of N content. (5) Tensile stress and elongation of steel with 0.2% proof stress of 780 MPa increase with increasing C and N contents and decreasing Ni content. The optimum composition of 0.02C-17Cr-6.7Ni-0.12N has been determined by the consideration of corrosion resistance and high strength.
社団法人日本鉄鋼協会の論文
1984-04-01