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C Si Mn Ni S P Cr Mo W V Co N Nb
1-1.1 ?? 0.5 ?? 0.5 ?? 0.4 ?? 0.03 ?? 0.03 3.8-4.4 8-9 1.5-2 1.7-2.1 4.7-5.2 0.05-0.1 0.1-0.3