渣 钢反应对高强度合金结构钢中生成较低熔点 非金属夹杂物的影响

 钢中非金属夹杂物绝大多数为较低熔点夹杂物，可以显著改善钢材的抗疲劳破坏性能。对炉渣 钢液 夹杂物间相互作用进行了实验室研究，发现钢中MgO Al2O3系高熔点夹杂物的比率随渣 钢反应时间增加而减少，与Al2O3的质量分数为20％和CaO/SiO2约为5的炉渣相比，采用Al2O3的质量分数为41％和CaO/SiO2约为65的炉渣，CaO MgO Al2O3 SiO2系夹杂物的比率由24.3%增加至81.7％，大多数夹杂物位于较低熔点成分区域（≤1500 ℃）。

Effect of Slag-Metal Reaction on Formation of Non-metallic Inclusions of Lower Melting Temperature in High Strength Alloyed Structural Steel

If the non metallic inclusions in alloying steels are of low melting temperature, the fatigue life of steels can be significantly improved. A laboratory study was carried out to investigate the inter reaction between slag, metal and inclusions. It was found that the amount of the high melting temperature inclusions of MgO Al2O3 type decreased with increasing the slag metal reaction time. Compared with using the slag containing about 20% Al2O3 and with a basicity of about 5, by using higher Al2O3 and higher basicity slag (Al2O3:41%, CaO/SiO2:6.5), the portion of CaO MgO Al2O3 SiO2 inclusions could be increased from 24.4% to 81.7% and most of them were of low melting temperature (≤1500 ℃).