If I hadn't put you back in that oven for the second time, you wouldn't be kept for very long because the hardness would not have held.
如果我没有再次把你放进烤箱，你也不会被保存很长时间，因为硬度会消失。
The hardening case depth and hardness curve can be changed by adjusting heating time, heating power and cooling speed during induction hardening.
在感应淬火中，通过改变加热时间、加热功率和冷却速度可以改变淬硬层深度和硬度梯度。
At the same time, some of the same or higher hardness material, such as diamond, corundum, metal oxide, quartz crystals are likely to damage the material.
同时一些硬度相同或更高的物质，例如钻石、刚玉、氧化金属、石英水晶都有可能损坏这些材料。
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