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Abstract
This paper presents the results of research on the influence of cold rolling and quenching temperature on microstructure and mechanical properties of low Mn steel. The microstructure of the samples after deformation at different levels: 20%; 50% and 80% shows that the sample after cold rolling at 50% has a grain size of level 10 (8.1µm) ensuring the subsequent heat treatment process. The quenching temperature was investigated at 740oC; 815oC and 890oC; the sample after quenching was tempered at 400 oC with a holding time of 11 minutes. Analysis of the microstructure of the steel after heat treatment shows that the structure includes ferrite phases; martensite and residual austenite. After heat treatment, the structure has plate-shaped grains and small spherical grains. The mechanical test results show that after heat treatment, the sample after quenching at 815oC; The tempering at 400oC with a holding time of 11 minutes gave a tensile strength value of 1148,8N/mm2 and a maximum elongation of 68.3%. The Rm*A value achieved was 78463,04Mpa*%.