改善45结构钢切削性能的研究

来源期刊：钢铁2009年第8期

论文作者：秦哲 孙彦辉 蔡开科

文章页码：24 - 28

关键词：切削性能； 45结构钢； 夹杂物； 高温塑性

Key words：machinability； 45 steel； inclusion； hot ductility

摘    要：开展了向中碳45结构钢中加入S、Ca元素来改善切削性的研究。研究结果表明:钢中w([S])=0.06%,总钙w(T[Ca])=40×10^-6,w([Al]_s)=0.01%左右时,夹杂物的纺锤率为57%;小于2.5μm的夹杂物数量占夹杂物总数82%,夹杂物呈细小、弥散状态分布于钢中。由热模拟试验得出钢的塑性转变温度在1 100~1 000℃,通过配水软件计算出二冷各区的冷却水流量并应用于生产,铸坯表面和内部无裂纹,力学性能与未加S、Ca元素的45钢相当,但切削性能有明显的改善,切削刀具寿命提高了25%以上。

Abstract: Based on BOF→LF→CC production process of Shijiazhuang steel plant,the research on addition of sulfur and calcium to 45 steel in order to improve machinability was carried out.The results show that the ratio of the fusiform inclusion is 57% when [S],T,s in steel is 0.06%,40×10^-6,0.01% respectively;the inclusions less than 2.5 μm in size account for 82% and the tiny inclusions dispersed in steel.Thermal simulation tests show that the ductility transition temperature of this steel is 1 100-1 000 ℃,the cooling water flow in every secondary cooling segment were calculated by the solidification thermal transmission model.The comparison experiments on mechanical property and machinability between calcium-sulfur free-cutting steel and 45 steel show that the two kinds of steel have the same mechanical property;the machinability of calcium-sulfur free-cutting steel is superior to 45 steel.The tool life machining calcium-sulfur free-cutting steel is 25% longer than 45 steel.