A high-strength, high-toughness martensitic stainless steel sheet has a chemicalpositionprising, in mass percent, more than 0.03 to 0.15% of C,.0% of Si, not more than 1.0% of Mn, not more than 0.06% of P, not more than 0.006% of S,.0% of Ni,.0% of Cr, more than 0.03 to 0.10% of N,.0070% of B, and the balance of Fe and unavoidable …
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