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研究了新型预硬型贝氏体钢（Ｙ８２）的合金设计及性能，分析了合金元素Ｓｉ， Ｓ， Ｃａ 的作用。结果表明： 新型预硬型贝氏体钢（Ｙ８２）成分简单，价格低廉，空冷淬透性好； 合金元素Ｓｉ改变了奥氏体连续冷却转变曲线（ＣＣＴ）的位置，使ＣＣＴ曲线中贝氏体转变区向右下方移动。使贝氏体转变发生在较低的温度，可以形成细小的针状下贝氏体，从而提高了钢的机械性能； 合金元素Ｓ提高了钢的易切削性，元素Ｃａ 对夹杂物有变质作用，使钢中ＭｎＳ形成一种特殊的形态，因而使Ｙ８２ 在预硬状态时（硬度约为３５～４０ ＨＲＣ）仍具有良好的切削加工性能。
The design and properties of the new pre-hardened bainitic steel (Y82) were studied. The effects of alloying elements Si, S and Ca were analyzed. The results show that the composition of the new pre-hardened bainitic steel (Y82) is simple, the price is low, and the air-cooling hardenability is good. The alloying element Si changes the position of the austenite continuous cooling transformation curve (CCT) The body transition area moves to the lower right. So that the bainite transformation occurs at a lower temperature, can form a fine acicular bainite, thereby enhancing the mechanical properties of steel; alloying elements S improve the machinability of steel, elemental Ca metamorphism of inclusions , Make the steel MnS form a special form, so that the Y82 in the pre-hardened state (hardness of about 35 ~ 40 HRC) still has good machinability.