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。
Then, pneumatic valve spring made from this spring steel wire have been treated by this investigation of liquid tufftriding process.
本文介绍用三种不同成分的硫酸渣，通过物理、化学和低温氧化处理，制成性能优良的永磁铁氧体。
The excellent hard ferrite is prepared by the three kinds of the Dregs of sulfuric acid through physical and chemical treatment as well as oxidizing treatment in lower temperature.
开发了一种高质量发黑工艺，它是在低温化学镀镍的基础上进行氧化处理的方法。
Based on the electroless plating process at low temperature, a new blackening method with high quality surface was developed.
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