In chemical tempering, sodium ions in the surface are replaced with potassium ions, which are about 30 percent larger.
还有化学退火的方法，即用尺寸大30%的钾离子取代表面的钠离子。
Combining the tempering behavior with the grinding thermal model, the change in surface hardness due to grinding heat could be predicted.
通过合并磨削热模型和回火效应可以预测工件磨削后的表面硬度变化。
It is made of rustproof tempering steel with a satin-finish surface.
它由防锈的回火钢制成，具有缎光表面。
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