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Chemical composition, % C Cr Ni Mg Mo Fe ≤0.08 17.0~21.0 50~55 ≤0.01 2.8~3.30 Margin Nb B S Mn Si P 4.75~5.50 ≤0.006 ≤0.015 ≤0.35 ≤0.35 ≤0.015 Cu Ti: Al V Ca Co ≤0.30 0.65~1.15 0.30~0.7 - ≤0.01 ≤1.00 ...