The invention discloses a free cutting steel containing higher tin content, which belongs to the technical field of metallurgy. The utility model is characterized in that the alloy of Mo, W and rare earth element La is alloyed by the free cutting steel, so as to solve the problem that the high brittleness of the free cutting steel is caused by the excessive tin content. The basic elements of free cutting steel and its mass percentage is C:0.02 ~ 0.77%, Si:0.01 ~ 0.10%, Mn:0.30 ~ 1.50%, S:0 ~ 0.035%, P:0 ~ 0.025%, Sn:0.05 ~ 0.35%C; the main alloying elements and their mass percentage is Mo:0.2 ~ 0.75%, W:0.4 ~ 2.25%, 0.002 ~ 0.020% La: of rare earth elements; the remaining component is iron impurity and the inevitable. The alloying process of Mo, W and rare earth elements La is mainly realized in the refining process. The steel has good cutting performance and high hot rolling properties and rolled surface quality. It is a low sulfur and lead-free environment-friendly material in line with the development trend of free cutting steel.
【技术实现步骤摘要】
一种含有较高锡含量的易切削钢及制备方法
本专利技术涉及一种含有较高锡含量的易切削钢,属于冶金
技术介绍
随着国民经济的发展,自动机床的数量迅速增加,其应用范围也日益扩大。同时,由于采用新型刀具和新工艺,使切削速度日趋提高,要求各种机加工件的表面粗糙度和精密度更加严格,因此,钢的可切削性受到普遍重视。各国竞相研制具有优良可切削性的钢种——易切削钢。目前,易切削钢主要消费国均为发达国家,我国的易切削钢消费量还很少,但在不断扩大。易切削钢在汽车、拖拉机、摩托车、航空、航天、卫星、战略导弹及常规武器零部件、办公及电子设备等领域中应用广泛。常用的硫系和铅系易切削钢,其冶炼时空气污染严重,且铅有毒,对人体有害。铅易切削钢的使用将逐渐受到限制,欧共同体已经限制回收含铅的汽车构件。因此,开发和生产环境友好的低硫、无铅易切削钢是重要的发展方向。含锡易切削钢正是顺应这种发展趋势而提出的,它主要利用锡在钢中引起的脆性,如晶界致脆、切削过程中在刀具和被切削材料之间的接触面上呈熔融状态的Sn而引起的熔融金属脆性,以及熔融金属Sn对刀具的润滑作用来提高切削性能。Sn的沸点高、蒸汽压 ...
【技术保护点】
一种含有较高锡含量的易切削钢,其特征在于:该钢的基本化学元素为C、Si、Mn、S、P、Sn,主要的合金化元素为Mo、W、稀土元素La;其中,碳含量范围在0.02~0.77%;硅含量范围在0.01~0.20%;锰含量范围在0.50~1.50%;硫含量范围在0.004~0.035%;磷含量范围在0.004~0.025%;锡含量范围在0.05~0.35%;钼含量范围在0.2~0.75%;钨含量范围在0.4~2.25%;稀土元素La含量范围在0.002~0.020%;其余成分为铁及不可避免的杂质。
【技术特征摘要】
1.一种含有较高锡含量的易切削钢,其特征在于:该钢的基本化学元素为C、Si、Mn、S、P、Sn,主要的合金化元素为Mo、W、稀土元素La;其中,碳含量范围在0.02~0.77%;硅含量范围在0.01~0.20%;锰含量范围在0.50~1.50%;硫含量范围在0.004~0.035%;磷含量范围在0.004~0.025%;锡含量范围在0.05~0.35%;钼含量范围在0.2~0.75%;钨含量范围在0.4~2.25%;稀土元素La含量范围在0.002~0.020%;其余成分为铁及不可避免的杂质。2.根据权利要求l所述的一种含有较高锡含量的易切削钢的制备方法...
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