Table1 Chemical compositions(wt%) and mechanical properties of steels tested Steel C Si Mn P S Cr Mo Sn Sb J-factor FATT ℃ TS MPa Low J 0.14 0.08 0.55 0.005 0.0007 2.42 1.08 0.010 0.0011 95 -76 613 Mid J 0.15 0.25 0.55 0.015 0.0013 2.39 1.03 0.024 0.0009 312 6 623 Annealed 0.15 0.24 0.53 0.013 0.0013 2.45 1.02 0.022 0.0006 270 7 552 Enhanced 0.16 0.28 0.40 0.009 0.0150 2.16 1.01 0.004 0.001 88 4 668 J-factor=(Si+Mn)X(P+Sn)x104 0 10 20 30 40 0 100 200 300 400 500 KI Temp. Pressure KI, (10xMPam1/2), Temp.(℃) Elapsed time (hr.) 4 6 8 10 12 14 16 18 Pressure (MPa) MODEL SS Attachment Crack 145mm 6 mm SS Base Figure 1 Example of shutdown temeperature, pressure and calculated result of crack loading at a bottom shell section with a stainless attachment t (hr) CMOD t (hr) CMOD RL RL CD CD CD RL RL 0.00003mm/sec. Figure 2 Loading pattern for hydrogen embrittlment fracture mechanics test
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