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————（heat） it to a certain temperature and then quickly cooling in water may harden high carbon steel.

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翻译下面术语（文中重点）1.carbon steel 2.alloy steel 3. high-speed steel 4. stainless steel 5.heat-resistant steel

翻译下面句子Heating it to a certain temperature and then quickly cooling in water may harden high carbon steel.

翻译The more carbon the steel contains and the quicker the cooling is, the harder it becomes.

翻译Because of its high strength and hardness this grade of steel may be used for tools and working parts of machines.