316L不锈钢LF精炼过程夹杂行为热力学分析和工艺优化  

Analysis on Thermodynamics of Behavior of Inclusions in Stainless Steel 316L during LF Refining and Process Optimization

作　　者：李吉东[1,2] 韩培德[1] 王烽[2] 任永秀 贾元伟 

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]山西太钢不锈钢股份有限公司技术中心,太原030003

出　　处：《特殊钢》2017年第1期23-26,共4页Special Steel

摘　　要：采用热力学计算方法得出316L不锈钢(/%:0.02C,0.51Si,1.15Mn,0.030P,0.001S,16.77Cr,10.12Ni,2.07Mo,0.040N,0.006Ti,0.004A1)精炼过程中脱氧平衡后形成MgO·Al_2O_3、2MgO·SiO_2、3Al_2O_3·2SiO_2、2NgO·2Al_2O_3·5SiO_2优势区图,研究和分析了各类夹杂物生成与转变的热力学条件。结果表明,在1 873 K时,当钢液中的溶解Al含量低于0.001%和溶解Mg含量低于2×10^(-7)%时才能形成低熔点变形能力较好的2MgO·2Al_2O_3·5SiO_2类夹杂物;当钢液中溶解Al含量在1.7×10^(-4)%以下,钢液中不形成MgO·Al_2O_3尖晶石夹杂;2MgO·SiO_2与3Al_2O_3·2SiO_2类高熔点夹杂物形成区域最大。实践表明,加Ca对高熔点夹杂物2MgO·SiO_2与3Al_2O_3·2SiO_2变性处理的热力学条件充足,当316L不锈钢180 t LF钢液溶解氧为0.002 0%,进行喂硅钙线2 m/t,精炼终点[O]为0.001 5%,2 mm冷轧板夹杂物为C类0.5~1.0级,主要成分为CaO·Al_2O_3·SiO_2。The diagrams of forming MgO·Al2O3 , 2MgO·SiO2, 3Al2O3·2SiO2 and 2MgO· 2Al2O3· 5SiO2 phase predominance area during refining process of stainless steel 316L （/% ： O. 02C, O. 51Si, 1.15Mn, 0. 030P, . 001S, 16. 77Cr, 10. 12Ni, 2. 07Mo, 0. 040N, 0. 006Ti, 0. 004A1） in equilibrium condition after deoxidation are obtained by using thermodynamic calculation method, and the thermodynamic conditions for formation and transformation of various inclu- sions have been studied and analyzed. Results show that at 1 873 K as the solution A1 content in liquid is less than 0. 001% and the solution Mg content is less than 2× 10-7% , it is available to form the better deformable 2MgO ×2Al2O3 × 5SiO2 low-melting-point inclusions; as solution A1 content in liquid is less than 1.7× 10-4%, there is no spinel inclusions MgO ~ Al2O3 formed in liquid; and the formation area of high-melting-point inclusions 2MgO· SiO2 and 3Al2O3 ~ 2SIO2 is lar- gest. Practice results show that the thermodynamic condition for modification treatment on high-melting-point inclusions 2MgO ·SiO2 and 3Al2O3·2SiO2 by adding Ca is sufficient, as solution oxygen content in 180 t LF liquid of stainless steel 316L is 0. 002 0% , the refining end [ O] is 0.001 5% by feeding silicon-calcium wire 2 m/t, and the rating of C-type in- clusions in 2mm cold rolled sheet is 0. 5- 1.0, the main composition of inclusions is CaO · Al2O3·SiO2.

关 键 词：316L不锈钢 热力学计算 夹杂物生成与变性 180 t LF 钙处理 

分 类 号：TF764.1[冶金工程—钢铁冶金]