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The influences of Zr addition on the mechanical properties of reduced-activation ferritic–martensitic steel were investigated. 9Cr-based steels with Zr contents varying 0–0.01wt% were designed and produced by vacuum induction melting, and then formed into a plate by hot rolling, which was followed by normalizing and tempering. The addition of 0.005wt% Zr improves the impact resistance with a slight...
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