Abstract: The hot rolled and annealed nitrogen bearing martensitic stainless steel 420U6 (/% ：0. 16C, 13. 63Cr, 0. 083N) was cold rolled by a 4-high reversable cold rolling mill with the cold rolling reductions 10% ~ 90% , and the effect of cold rolling reduction on microstructure and mechanical properties of the steel was studied. The results show that the number of the caibides considerably increases from 0. 1 X 10⁶/mm2 at the initial annealed state to 2, 35 X 10⁶/mm2 at the 90% cold rolled state, while the average diameter of the carbides decreases from 1.11 μm to 0. 22μm  and the distribution of the cariaides become more evenly. Additionally, hardness and yield strength hugely increases from 170 HV and 335 MPa in the initial annealed state to 325 HV and 1 108 MPa at the 90% cold rolled state respectively, while the elongation reduces sharply when cold rolling reduction increases from 0% to 40% , after which the elongation gradually stabilizes at about 6%.

摘要： 采用四辊可逆冷轧机组对热轧退火态含氮马氏体不锈钢420U6（/%:0.16C,13.63Cr,0.083N）进行了压下率10%～90%的冷轧,研究了冷轧压下率对该钢组织和力学性能的影响。试验结果表明:当冷轧压下率达到90%时,碳化物的数量由原始退火态的0.1×10⁶个/mm2大幅提高至2.35×10⁶个/mm2,而碳化物的平均直径则由1.11μm降低到0.22μm,同时碳化物的分布更加均匀。此外,材料的硬度和屈服强度分别由原始退火态的170 HV和335 MPa分别大幅提高到冷轧压下率为90%的325 HV和1 108 MPa,而延伸率在冷轧压下率为0%～40%时出现大幅下降,之后则逐渐稳定在6%左右。