AlMnCa合金脱氧和非金属夹杂物控制技术  

Steel Deoxidation and Non-metallic Inclusion Control Using AlMnCa Alloy

作　　者：战东平[1] 张慧书[1] 李术川[1] 姜周华[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2006年第10期1118-1121,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金与上海宝钢集团公司联合资助项目(50174012).

摘　　要：在1873K下,MoSi2电阻炉内用70mm×100mmMgO坩埚和AlMnCa合金开展了3炉低碳低硅钢脱氧实验.结果表明,用1#AlMnCa脱氧后,钢中溶解氧和全氧含量均较低,终点全氧质量分数为37×10-6.用AlMnCa脱氧后钢中夹杂物大部分为球形的含有CaO的复合夹杂物.用AlMnFe脱氧后,钢中主要是Al2O3或Al2O3-MnO等构成的复合夹杂物,其形状仅有少量为球形.实验终点钢中89.1%的夹杂物尺寸小于10μm,无大于50μm的夹杂物.用1#AlMnCa在25t转炉上进行了6炉TGD07钢脱氧工业试验,脱氧后钢中氧质量分数平均为23.8×10-6,最低达到8×10-6.与未用AlMnCa合金脱氧的钢相比,钢材的平均屈服强度提高19.2MPa,抗拉强度提高26.2MPa,延伸率增加0.55%.Experiments for deoxidation of low-carbon and low-silicon steel and control of non-metallic inclusion were done for 3 heats at 1 873 K in a Ф70 mm × 100 mm MgO crucible put into MoSi2 resistance furnace, with AlMnCa alloy used as deoxidant. The results showed that after deoxidized with 1^# AlMnCa alloy, the dissolved oxygen and total oxygen content in the steel are both the lowest and the endpoint total oxygen is 37 × 10^-6, and most inclusions in the steel are spherical CaO-containing compounds. However, after the steel was deoxidized by AlMnFe alloy, most inclusions are Al2O3 or Al2O3-MnO compounds among which only a small part is spherical. In the final steel 89.1% of inclusion size is less than 10 μm with none bigger than 50 μm. Then, 6 heats of industrial deoxidation tests for TGD07 steel were done in an 25 t LD converter with 1 ^# AlMnCa alloy, and the results showed that the mean oxygen content in molten steel is 23.8 × 10^-6 even down to 8 ×10^-6. The average yield strength, tensile strength and elongation percentage of the test steel are increased by 19.2 MPa, 26.2 MPa and 0.55%, respectively, compared with that of the not test steel.

关 键 词：炼钢 脱氧 AlMnCa合金 夹杂物 低碳钢 低硅钢 

分 类 号：TF704.1[冶金工程—钢铁冶金]