制备了铬含量（质量分数）分别为0.01%，0.10%，0.13%，0.16%的高碳钢65Mn热轧钢带，利用金相显微镜检测了不同铬含量试样的显微组织及晶粒度，并测试了不同铬含量试样的力学性能。结果表明：铬元素能细化65Mn钢的珠光体片层间距，弱化网状铁素体；当铬含量从0.01%增加至0.16%时，65Mn钢的晶粒度级别从8.0级提高至8.8级，抗拉强度从822 MPa增加至999 MPa，而断后伸长率从29%下降至22%；并且当铬含量低于0.13%时，铬含量的增加对材料组织和力学性能的作用效果显著；铬元素通过晶粒细化和第二相Cr₃C析出共同影响高碳钢65Mn的综合力学性能。

Hot rolling strip of 65Mn high carbon steel was prepared with Cr contents (mass fraction) of 0.01%, 0.10%, 0.13% and 0.16%, respectively. The microstructure and grain size of the samples with different Cr contents were analyzed by metallographic microscope, and the mechanical properties of the samples were also tested. The results show that the spacing of the pearlitic laminates could be refined and the reticular ferrite could be weakened by adding Cr element in the 65Mn steel. When increasing Cr contents from 0.01% to 0.16% in 65Mn steel, the grade of grain size increased from 8.0 to 8.8, and the tensile strength increased from 822 MPa to 999 MPa, while the percentage elongation after fracture decreased from 29% to 22%. Moreover, when the Cr contents were less than 0.13%, microstructure and mechanical properties of the materials were influenced by the Cr contents significantly. The comprehensive mechanical properties of 65Mn high carbon steel were affected by the element of Cr with the effects of grain refining and secondary phase Cr₃C separating.