Abstract
The aim of this investigation was to study the effect of tempering temperature and metal purity on limited impact endurance under tensile loads at room and subzero temperatures. The tests were carried out on quench-hardened specimens of two grades of 30CrMnSiNiN steel: electric-arc smelted, i.e., in the initial condition (0.29% C, 1.3% Mn, 1.09% Si, 1.58% Ni, 1.04% Cr, 0.2% Cu, 0.012% S, 0.015% P, 0.01% O2, 0.01% N2) and subjected to a vacuum-arc refining (VAR) treatment (1.08% Mn, 0.007% S, 0.004% O2, 0.003% N2; the remaining impurities as in steel in the initial condition). VAR produces a substantial reduction in the content of O2, N2, S, and nonmetallic inclusions in the steel which, after this treatment, had a higher impact strength but virtually the same static strength properties.
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