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用Ｈｏｌｌｏｍｏｎ方法研究了非调质钢３５ＭｎＶＮ的加工硬化指数的阶段性，有ｎ＿１，ｎ＿２，ｎ＿３３个硬化指数。沉淀相降低了钢的ｎ值。分析了ｎ＿１，ｎ＿２，ｎ＿３与显微组织的关系。ｎ＿１主要受沉淀相对先共析铁素体的影响控制；ｎ＿２主要受铁素体与珠光体协调变形性控制；ｎ＿３与珠光体晶团内各相协调变形及Ｆｅ＿３Ｃ片行为有关。ｎ＿２与ε＿ｕ近似相等。测定了钢的ｎ＿ｕ，ｎ＿（ｕｎ），ｎ＿ｔ供比较用。比较了正火４０钢与３５ＭｎＶＮ钢ｎ值和φＫ值，认为不同钢种、不同显微组织条件下，不宜用ｎ值的高低直接作为塑性高低的判据。
Hollomon method was used to study the stage hardening of non-quenched and tempered steel 35MnVN with n_1, n_2, n_33 hardening index. The precipitated phase reduces the n value of the steel. The relationship between n_1, n_2, n_3 and microstructure was analyzed. n_1 is mainly controlled by the influence of precipitation on pro-eutectoid ferrite; n_2 is mainly controlled by the coordination deformability of ferrite and pearlite; and n_3 is related to the coordination deformation and the behavior of Fe_3C in each phase of pearlite. n_2 is approximately equal to ε_u. Determination of the steel n_u, n_ (un), n_t for comparison purposes. Compare n value and φK value of normalized 40 steel and 35MnVN steel, it is considered that different steel grades and different microstructural conditions should not be directly used as the criterion of plasticity level.