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Synopsis : Step cooling and isothermal aging tests at 425, 450 and 475•Ž, for 54 000, 20 000 and 5 000 h, respectively, were performed on 21/4 Cr-1Mo steels with various amount (in mass pct.) of Si, Mn, Cu, Ni and impurities. The relationship between the step cooling-and the isothermal temper-embrittlement and chemical compositions was discussed. The results are summarized as follows. 1) The shift in 50% fracture appearance transition temperature and 40ft-lb transition temperature by the step cooling treatment (ƒ¢FATTsc, ƒ¢40TTsc) have good correlation to a embrittling factor K2 = (2Si+ Mn + Cu + Ni)•EX, where X = (10P + 5Sb + 4Sn + As) •~ 102. Therefore, the reduction of amount of Si, Mn, Cu, Ni and impurities is effective to reduce the susceptibility to temper embrittlement. 2) The equations, which can accurately estimate the shift in 50% fracture appearance transition temperature and 40ft-lb transition temperature by isothermal temper embrittling at T•Ž for th (ƒ¢FATTiT, ƒ¢ 40 TT iT) from K2 and X, were derived. 3) Assuming that the life of peterochemical plants is 20 years at 425•Ž and the required toughness for forgings is 40 TT 10 or 38•Ž, chemical compositions of a 300 mm thich 234 Cr-1Mo steel forging shall be controlled as follows. 40 TT•... 10•Ž•c•c X•... 13.0, K2•... 14.3 40 TT•... 38•Ž•c•c X•... 17.5, K2•... 19.3

Estimation of Long Term Isothermal Temper Embrittlement in 21/4Cr-1Mo Steel from Chemical Compositions