Then, pneumatic valve spring made from this spring steel wire have been treated by this investigation of liquid tufftriding process.

然后，用以对此规格的钢丝制造的气阀弹簧进行了低温液体软氮化处理。

youdao

Then, pneumatic valve spring made from this spring steel wire have been treated by this investigation of liquid tufftriding process.

然后，用以对此规格的钢丝制造的气阀弹簧进行了低温液体软氮化处理。

youdao