改善低碳高硫易切削钢切削性能的工艺实践

在分析影响易切削钢AISI 1215切削性能因素的基础上,通过将钢中的碳含量从0.094%降至0.072%, LF精炼用硅锰脱氧,控制LF终点游离o]60×10^-6~80×10^-6,140 mm×140 mm坯结晶器水流量从1 900~2 050 L/min降至1700~1 850 L/min,二冷区比水量由1.15 L/kg降至0.90 L/kg,优化轧制工艺使硫化物平均直径由原来的2.09μm增加至3.11μm等工艺措施,使低碳高硫(0.072%C,0.365%S)易切削钢盘条的切削性能明显提高,零件表面粗糙度为2μm左右,满足用户要求。

Process Practice of Improvement on Cutting Quality of Low-Carbon High-Sulphur Free-Cutting Steel

Based on analysis of factors on cutting quality of free-cutting steel AISI 1215, with using the process measures including decreasing carbon content in steel from 0. 094% to 0. 072%, during LF refining using silicon-manganese deoxidizing addition and controlling LF refining end active oxygen content 60 x 10^-6 - 80 X 10^-6, decreasing 140 mm x 140 mm billet mold water rate from 1 900 ~ 2 050 L/min to 1 700 ?1 850 L/min, decreasing secondary cooling water ratio from 1.15 L/kg to 0. 90 L/kg and optimizing rolling process to increase the average diameter of sulphide in steel from original 2.09 μm to 3. 11 μm, the cutting quality of coil of low-carbon high-sulphur (0. 072% C, 0. 365% S) free-cutting steel increases markedly and the surface roughness of parts is about 2 μm to meet the requirement of user.