多次回火后，高钒高速钢硬度降低，耐磨粒磨损性能下降。

The hardness and the wear resistance decrease after multiple tempering.

youdao

多次回火后，高钒高速钢硬度降低，耐磨粒磨损性能下降。

The hardness and the wear resistance decrease after multiple tempering.

youdao