重载齿轮用20CrNi2Mo 和20Cr2Ni4 钢热处理工艺性能对比研究
중재치륜용20CrNi2Mo 화20Cr2Ni4 강열처리공예성능대비연구
Study on comparing of heat treatment processing properties of 20CrNi2Mo and 20Cr2Ni4 used in heavy-duty gears
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