摘要
在实验室采用Al_2O_3坩埚硅钼管式炉研究了(/%)38.5～45.8CaO-38.2～42.0SiO_2-8～15Al_2O_3-8MgO精炼渣系的成分和碱度(1.0～1.2)对55SiCrA弹簧钢(/%:0.53C、1.50Si、0.70Mn、0.69Cr、0.008P、0.003S、0.005Als)中夹杂物形态的影响,并用Factsage热力学软件对夹杂物成分进行热力学计算和分析在三元相图中的分布。结果表明,夹杂物中Al_2O_3含量随精炼渣中Al_2O_3含量的增加而增加,当渣碱度为1.2,Al_2O_3为8%时钢中夹杂物分布在Al_2O_3-SiO_2-MnO相图低熔点区域,夹杂物中Al_2O_3含量为30%～40%。热力学计算表明,渣碱度1.0～1.2时,对应的钢中Als为0.008%与试验结果吻合。因此用1.0～1.2低碱度和≤8%Al_2O_3精炼渣可控制弹簧钢中的夹杂物形态。
The effect of ingredient and basicity （1.0 - 1.2） of （/% ：） 38.5 -45.8CAO-38.2 - 42.0SiO2-8 - 15Al2O3-8MgO refining slag series on morphology of inclusions in spring steel 55SiCrA （/% ： 0. 53C, 1.50Si, 0. 70Mn, 0. 69Cr, 0. 008P, 0. 0035, 0. 005Als） has been studied by silicon-molybdenum tube furnace with Al2O3 crucible in laboratory, and the thermodynamic calculation on ingredient of inclusions and the analysis on distribution of inclusions in ternary phase diagram are carried out by using thermodynamic software Factsage. Results show that with increasing Al2O3 content in refining slag the Al2O3 content in inclusions increases, as the basicity of slag is 1.2 with 8% Al2O3 , the inclusions in steel are distributed at low melting point area in Al2O3-SiO2-MnO ternary phase diagram and the Al2O3 content in inclusion is 30% - 40%. Thermodynamic calculation results show that as basicity of slag is 1.0 - 1.2 the corresponding Als in steel is 0. 008% that meets the examination results. Therefore it is available to control the morphology of inclusions in spring steel by using low basicity 1.0 - 1.2 and ≤8% Al2O3 refining slag.
出处
《特殊钢》
北大核心
2013年第3期14-17,共4页
Special Steel
