本申请涉及金属热处理技术领域,具体公开了一种齿轮钢及其热处理工艺,齿轮钢按照重量百分比由以下组分组成:0.47~0.55%C、0.17~0.37%Si、0.9~1.1%Mn、0.04~0.08%Mo、1.8~2.2%Cr、0.07~0.15%Ni、0.1~0.3%V、0.4~0.5%W、0.09~0.15%Ti、0.08~0.12%Nb、0.27~0.45%Cu、0.08~0.22%Ce、P≤0.015%、S≤0.015%,余量为Fe和不可避免的杂质;热处理工艺包括预热、渗碳处理、高温回火处理、淬火处理、低温回火处理。本申请具有降低齿轮产生裂纹可能的同时减少变形可能的优点。
The invention relates to the technical field of metal heat treatment, and particularly discloses gear steel and a heat treatment process thereof. The gear steel is prepared from the following components of, in percentage by weight, 0.47%-0.55% of C, 0.17%-0.37% of Si, 0.9%-1.1% of Mn, 0.04%-0.08% of Mo, 1.8%-2.2% of Cr, 0.07%-0.15% of Ni, 0.1%-0.3% of V, 0.4%-0.5% of W, 0.09%-0.15% of Ti, 0.08%-0.12% of Nb, 0.27%-0.45% of Cu, 0.08%-0.22% of Ce, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S and the balance Fe and inevitable impurities. The heat treatment process comprises the steps of preheating, carburizing treatment, high-temperature tempering treatment, quenching treatment and low-temperature tempering treatment. The gear steel and the heat treatment processhave the advantages that the possibility of gear cracks is reduced, and meanwhile the possibility of deformation is reduced.