The invention discloses a method for preparing a graphite quick cutting steel high speed wire rod, belonging to the metallurgical technology field. The preparation methods include smelting, continuous casting, heating, rough rolling, medium rolling, pre finishing rolling, finish rolling, water cooling, spinning, air cooling, coil coiling, etc. the production process of the wire rod and its graphitization annealing treatment. Which is according to the finishing temperature by water cooling device to control the spinning temperature, the Ac3 above 50 to 70 DEG C; by controlling the cooling speed, rapid cooling to ensure volume temperature at 550 ~ Ms bainite transformation temperature interval; graphitizing annealing mainly by isothermal treatment temperature of 620 DEG Ac1. The high speed wire rod prepared by this method is mainly composed of graphite and ferrite grain. Graphite is nearly spherical, uniform distribution, the average diameter is about 5 m; the average diameter of ferrite grain is about 20 mu m. The characteristics of the steel has good cutting performance, the relative cutting factor was less than 2.
【技术实现步骤摘要】
一种石墨化易切削钢高速线材的制备方法
本专利技术涉及一种石墨化易切削钢高速线材的制备方法,属于冶金
技术介绍
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。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。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。石墨化易切削钢正是顺应这种发展趋势而提出的,它主要利用钢中弥散分布起起润滑作用和断屑作用的石墨粒子来提高切削性能。利用石墨化技术来开发易切削钢,打破了利用脆性易切削元素来改善钢的切削性能的传统观点,易切削元素在给材料带来脆性的同时,降低了材料的工艺性能和使用性能。石墨易切削钢被业界认为是一种“绿色环保”的新钢材。目前,已公开发表的有关石墨化易切削钢的专利、文献中,主要是对基于促进石墨化过程设计其化学成分和制备方法,例如专利“Medium-carbonsteelhavingdispersedfinegraphitestructureandmethodforthemanufacturethereof,US6,174,384B1,2001”基于ZrC作为石墨的异质核心来促进石墨化过程,其主要的化学成分为0.1~1.5%Si,<1.0%C,0.01~0.5%Zr;该材料经热轧,或热轧后在750~1300℃进行0.5~10h热处理,或热轧后水淬以在基体中析出细小的Zr ...
【技术保护点】
一种石墨化易切削钢高速线材的制备方法,其特征在于:石墨化易切削钢化学成分质量百分比含量控制为:C:0.25~0.77%;Si:0.20~2.00%;Mn:0.50~1.60%;P≤0.010%;S:≤0.010%;Al:0.02~0.25%;B:0.0002~0.0060,N:0.002~0.010;其余含量为Fe;制备方法材料采用冶炼、连铸、加热、粗轧、中轧、预精轧、精轧、水冷、吐丝、风冷、集卷高速线材生产工艺过程及其石墨化退火处理;其中高速线材生产工艺过程中的精轧温度通过调整设置在精轧后的水冷装置控制吐丝温度,使其在Ac3以上50~70℃;通过控制风冷速度,使吐丝后的盘条在风冷线上快速冷却以保证集卷温度在550℃~Ms的贝氏体转变温度区。
【技术特征摘要】
1.一种石墨化易切削钢高速线材的制备方法,其特征在于:石墨化易切削钢化学成分质量百分比含量控制为:C:0.25~0.77%;Si:0.20~2.00%;Mn:0.50~1.60%;P≤0.010%;S:≤0.010%;Al:0.02~0.25%;B:0.0002~0.0060,N:0.002~0.010;其余含量为Fe;制备方法材料采用冶炼、连铸、加热、粗轧、中轧、预精轧、精轧、水冷、吐丝、风冷、集卷高速线材生产工艺过程及其石墨化退火处理;其中高速线材生产工艺过程中的精轧温度通过调整设置在精轧后的水冷装置控制吐丝温度,使其在Ac3以上50~70℃...
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