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。
Using high density laminar cooling device of steckel mill,low carbon Mn-Mo-Nb-Cr-Ni series Q800D/E grade construction machinery steel was produced by direct quenching and off-line tempering technique.The yield strength of the plate was more than 800 MPa and the CVN impact energy at-40 ℃ was more than 100 J after appropriate tempering.During tempering temperature rising,the precipitates in Q800D/E exhibited growing,re-nucleating and coarsing process,which would lead to the fluctuation of the plate strength.
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