2.25Cr-1Mo 鋼の水素侵食による気泡形成におよぼす P, Sn, As, Sb, Si, Cu の影響

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Effects of impurities P, S, As, and Sb and those of alloying elements Si and Cu on the density and growth of methane bubbles formed on grain boundaries in 2.25Cr-1Mo steel by hydrogen attack were investigated. The results are summarized as follows : (1) The addition of 0.016wt%Sn to the high-purity steel increased the bubble density and diameter by factors of 2.7 and 1.15 respectively. (2) The addition of 0.016wt%Sb increased the bubble density by a factor of 2 to 3, but reduced the bubble diameter to 0.8. (3) The addition of either 0.016wt%P or 0.017wt%As decreased the bubble density by a factor of 0.75∿0.5, while the growth rate was unchanged. (4) Phosphorus and arsenic, however, could not relieve the above effects of tin and antimony. (5) The bubble density and diameter of 0.26wt%Si steel were 1.3 and 1.4 times those of 0.016wt%Si steel respectively, where both the steels contained all of the impurities by 0.01wt% each. (6) The addition of 0.2wt%Cu decreased the bubble density but could not relieve the effects of tin and antimony when added together, while it increased the growth rate. (7) Temper-embrittlement treatment further reduced the bubble density in 0.016wt%P steel magnifying the effect of phosphorus, while the effect of tin was not magnified by the treatment in 0.016wt%Sn steel.
社団法人日本鉄鋼協会の論文
1980-07-01