圧力容器用 1/2Mo 鋼の靱性におよぼす Mo および C の影響

概要

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Effects of Mo and C contents on the impact properties of 1/2Mo steels utilized in the pressure vessel of the petroleum refining equipments, were investigated to improve the toughness. (1) Molibdenum addition suppresses the formation of ferrite in the steel resulting in the improvement in the toughness. On the other hand, if the microstructure of the specimens is constituted by the same volume fraction of ferrite, pearlite, and bainite, increasing Mo content decreases the upper shelf energy and increases the v_T_<rs>. (2) Increasing C content from 0.15 to 0.30% in 1/2Mo steels lowers the toughness. (3) On the basis of the experimental results on the relation between v_T_<rs> and microstructure of steels with 0.15∿0.75%Mo, it is found that good toughness is obtained and the variation of which was very small if steel plates had more than 40% bainite in volume. The above condition was realized by the appropriate cooling rate according to the plate thickness.
社団法人日本鉄鋼協会の論文
1986-10-01