在常用的碳素结构钢中,除碳元素外,微量合金元素的波动也对钢的机械性能有较大的影响,当碳及其他多种微量元素共存时,分清它们作用的主次顺序;确立它们与机械性能之间的关系对实际生产是有意义的。本文根据生产条件下积累的450炉45钢的化学成份(C、Mn、Si、S、P、Cr、Ni、Cn)及其正火态常规机械性能(σ_b,σ_s、δ、ψ)的数据,用多重秩和显著性检验方法确定了对常规机械性能起显著作用的因素,如表1所示。表1中 H 值的大小反应了碳及微量元素对机披性能影响的显著程度。由 x~2分布上侧分位表确定置信度为95%的用“*”标注;置信度为99%的,即特别显著的因素用“**”标注。对影响显著的诸元素的百分含量与其相应的性能数据进行了回归分 In the commonly used carbon structural steel, in addition to carbon, the fluctuations of trace alloying elements also have a greater impact on the mechanical properties of steel, carbon and other trace elements co-exist, the distinction between the order of their role; Establishing their relationship with the mechanical properties makes sense for actual production. According to the chemical composition (C, Mn, Si, S, P, Cr, Ni, Cn) and the normal mechanical properties (σ_b, σ_s, δ, ψ) , With multiple rank sum significance test to determine the factors that play a significant role on the conventional mechanical properties, as shown in Table 1. The magnitude of the H value in Table 1 reflects the significant degree of carbon and trace element effects on machine performance. From the x ~ 2 distribution of the upper sub-bit table to determine the confidence of 95% of the “*” label; confidence of 99%, that is particularly significant factor with “** ” label. The regression analysis of the percentages of the most influential elements and their corresponding performance data