ボイラー用鋼の諸特性におよぼす各種細粒化元素の影響

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The effects of various grain refining elements on creep rupture strength, strength at room temperature, and impact properties have been investigated for some boiler plate steels. The results obtained are as follows. 1) The impact properties and yield strength at room temperature depend only upon the grain size. The transition temperature in Charpy impact test (2 mm V notch) drops and the yield strength increases in proportion to the reciprocal of the square root of the ferrite grain diameter, but the creep rupture strength decreases with the decrement of the content of active nitrogen caused by the combination with such nitride forming elements as Al, Ti, and Nb. 2) Test temperatures at which the creep rupture strength are influenced by active nitrogen change with the chemical composition of steels. The effect of active nitrogen on the creep rupture strength is significant at 450℃ but is inconspicuous at 550℃ for Si-Mn steels. For steels containing Cr and /or Mo, the effect of active nitrogen is remarkable even at 550℃. This seems to be caused by the I. S. effect between Cr and /or Mo and nitrogen. 3) Even the addition of a small amount of Al as a deoxydizer loweres remarkably the creep rupture strength because Al is a very strong nitride former. But in steels containing Mo or both Mo and Cr, a still more addition of Al turns to increase the creep rupture strength. This is due to the increment of the amount of bainite with increasing Al content.
社団法人日本鉄鋼協会の論文
1973-08-01

ボイラー用鋼の諸特性におよぼす各種細粒化元素の影響

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