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The variation in microstructure and mechanical properties during heat treatment was examined in a series of 0.27% C-1.0% Si-1.5% Mn steels with chromium contents in the range of 0 to 1.0 wt%. It was found that chromium decreased the martensite packet size through the austenite grain refinement and increased tensile strength in the as-quenched steel, about 70 MPa per 1.0 wt%. The 0.27% C-1.0% Si-1.5% Mn-1.0% Cr steel showed tensile strength of 1700 MPa in the as-quenched steel. The 0.27% C-1.0% Si-1.5% Mn-1.0% Cr steel revealed a full martensitic structure after air cooling from 900oC to room temperature, showing air hardening characteristics. Tempering at 150oC slightly decreased the tensile strength and increased elongation, which is in a good agreement with impact toughness result. (Received June 9, 2016; Revised July 13, 2016; Accepted July 22, 2016)

Effect of Cr on Mechanical Properties and Microstructure in 0.27% C-1.0% Si-1.5% Mn Steel