【作者】 张博； 王福明； 李长荣；

【Author】 Zhang Bo~(1,2*),Wang Fuming~1,Li Changrong~3(1.School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;2.Key Lab.of Ecologic & Recycle Metallurgy,Ministry of Education; 3.School of Material Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

【机构】 北京科技大学冶金与生态工程学院； 北京科技大学生态与循环冶金教育部重点实验室； 北京科技大学材料科学与工程学院；

【摘要】 为了控制60Si2MnA弹簧钢中氧化物夹杂为低熔点和良好的变形能力,使其降低对拉拔性能与疲劳性能的有害影响,本文借助FactSage热力学软件,对60Si2MnA弹簧钢获得低熔点夹杂物时的钢液条件以及MgO对CaO-Al₂O₃-SiO₂-MgO系夹杂物低熔点区域的影响进行了计算分析。结果表明:60Si2MnA弹簧钢获得低熔点MnO-SiO₂-Al₂O₃系夹杂物,钢中[Al]和[O]含量应分别控制在1～5 ppm和60～70 ppm。获得低熔点CaO-SiO₂-Al₂O₃系夹杂物,钢中[Al]和[O]应分别控制在8～15 ppm和20～30 ppm。MgO的加入可显著提高CaO-Al₂O₃-SiO₂-MgO系低熔点区域,MgO含量为15%时低熔点区域最大,此时,60Si2MnA弹簧钢若获得CaO-SiO₂-Al₂O₃-15%MgO系低熔点夹杂物,钢中[Al]和[O]应分别控制在10～25 ppm和20～30ppm。更多还原

【Abstract】 In order to control oxide inclusions as low melting point and good deformability and improve drawing property and fatigue property of 60Si2MnA Spring steel,the molten steel conditions when low melting point inclusions is obtained,as well as the effect of MgO contents on low melting point area of CaO-Al₂O₃-SiO₂-MgO system was calculated and analyzed by thermodynamic software FactSage.The results show that when the low melting point MnO-SiO₂-Al₂O3 inclusions is obtained,Al and O contents in molten steel should be in the range of 1～5 ppm and 60～70 ppm,respectively.When the low melting point CaO-SiO₂-Al₂O₃ inclusions is obtained,Al and O contents should be in the range of 8～15 ppm and 20～30 ppm,respectively.Low melting point area of CaO-Al₂O₃-SiO₂-MgO system is remarkably increased with addition of MgO,maximum of low melting point area is achieved at 15%MgO content,when the low melting point CaO-Al₂O₃-SiO₂-15%MgO inclusions is obtained,Al and O contents should be in the range of 10～25 ppm and 20～30 ppm,respectively.更多还原