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采用低碳Mn-Mo-Nb-Cr-Ni系的成分设计,并通过炉卷轧机高密层流冷却装置直接淬火工艺,配以合适的回火制度,生产了屈服强度高于800MPa,-40℃冲击功达到100J以上的高强工程机械用Q800D/E钢板。回火温度升高过程中,Q800D/E钢板中的析出物呈现先长大而后重新形核析出随后再粗化的过程,是其强度随回火温度升高呈现先下降后上升而后再下降的原因所在。
Low-carbon Mn-Mo-Nb-Cr-Ni series of components are designed and directly quenched by high-density laminar flow cooling equipment of the furnace roll mill with a proper tempering system to produce steel with yield strength higher than 800MPa and -40 ℃ Impact power to reach more than 100J high strength construction machinery Q800D / E steel. In the process of tempering temperature increase, the precipitates in Q800D / E steel show the process of growing first and then nucleating and then re-roughening. The strength of the Q800D / E steel increases first and then decreases with the increase of tempering temperature The reason is.