加入镍和铜，钢的淬透性提高，硬度增加；
The addition of Nickel and Copper improves the hardenability and the baldness.
铬能进步钢的淬透性和耐磨性，能改进钢的抗腐蚀才能和抗氧化效果。
Chromium can improve the steel's quenching and wear resistance, can improve the corrosion resistance and oxidation resistance of steel.
介绍了硼元素的特点及其在钢中的作用，微量硼可以明显改善钢的淬透性和韧性。
The characteristics of boron element and its effect in cast steel are introduced. Microamount boron can improve the hardenability and toughness of carbon steel.
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