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精炼渣成分对高强度低合金钢中非金属夹杂物影响
引用本文:张静, 于会香, 王新华, 王万军, 王茂. 精炼渣成分对高强度低合金钢中非金属夹杂物影响[J]. 工程科学学报, 2011, 33(7): 828-833. DOI: 10.13374/j.issn1001-053x.2011.07.018
作者姓名:张静  于会香  王新华  王万军  王茂
摘    要:采用渣钢平衡的实验方法研究了1600℃下不同碱度和不同Al2O3含量的强还原性精炼渣对高强度低合金钢中非金属夹杂物的影响.结果表明:渣钢反应平衡后,炉渣中CaO和SiO2的质量比为1.9~4.5、Al2O3质量分数为21%~33%,钢中夹杂物主要为球状的CaO-MgO-Al2O3-SiO2系,尺寸在5μm以下,炉渣成分对夹杂物的成分影响很大.夹杂物主要分布在SiO2含量一定的CaO-MgO-Al2O3-SiO2伪三元相图中1 400~1 500℃的低熔点区,随着炉渣碱度的提高和Al2O3含量的降低,部分夹杂物逐渐偏离低熔点区域,夹杂物的总数量逐渐减小.当渣中Al2O3质量分数为21.22%、碱度为3.27时,有大量夹杂物分布在高熔点区域,夹杂物的总数量最小.

关 键 词:高强钢  低合金钢  精炼渣  夹杂物  氧化铝
收稿时间:2010-07-13

Effect of refining slag composition on non-metallic inclusions in high-strength low-alloy steel
ZHANG Jing, YU Hui-xiang, WANG Xin-hua, WANG Wan-jun, WANG Mao. Effect of refining slag composition on non-metallic inclusions in high-strength low-alloy steel[J]. Chinese Journal of Engineering, 2011, 33(7): 828-833. DOI: 10.13374/j.issn1001-053x.2011.07.018
Authors:ZHANG Jing  YU Hui-xiang  WANG Xin-hua  WANG Wan-jun  WANG Mao
Abstract:The effect of strongly reduced refining slag with different basicities and Al2O3 contents on non-metallic inclusions in molten steel was investigated through the slag-metal equilibrium at 1 600℃.When the slag-metal equilibrium is reached,the mass ratio of CaO to SiO2 in refining slag is from 1.9 to 4.5,and the mass fraction of Al2O3 is from 21% to 33%.Non-metallic inclusions in steel are mainly the spherical CaO-MgO-Al2O3-SiO2 system with size smaller than 5 μm.The composition of refining slag has a great effect on inclusions.Inclusions mainly distribute in the low melting point region of the CaO-MgO-Al2O3-SiO2 quasi-ternary phase diagram with stable content of SiO2 between 1 400℃ and 1 500℃.With the basicity of refining slag increasing and the Al2O3 content decreasing,part of inclusions gradually deviate from the low melting point region and the total number of inclusions decreases.When the mass fraction of Al2O3 is 21.22% and the basicity of refining slag is 3.27,lots of inclusions distribute in the high melting point region and the total number of inclusions is the smallest.
Keywords:high strength steel  low alloy steel  refining slag  inclusions  alumina
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