含镁合金的制备及在炼钢中的应用  

Preparation and application of magnesium alloy in steelmaking process

作　　者：王承[1] 龚伟[1] 姜周华[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819

出　　处：《材料与冶金学报》2015年第2期91-95,共5页Journal of Materials and Metallurgy

基　　金：国家自然科学基金(51174050);国家高技术研究发展计划(2012AA03A503);教育部基本科研业务费(N110402010)

摘　　要：利用镁处理生产超纯净钢及改善钢的显微组织和机械性能等越来越受到重视.但是目前镁加入钢液中,反应十分剧烈,收得率很低且不稳定,无法满足实验的要求.本文拟利用金属粉末针对超高强度钢300M,制备Ni-Mg-Fe系和Ni-Mg-Mo-Fe系中间合金,镁的质量分数在5%左右,并采用电阻炉小坩埚实验.结果表明,无论是Ni-Mg-Fe系还是Ni-Mg-Mo-Fe系的含镁合金压块,镁的收得率都远远超过了预设的5%,镁的溶解量已基本达到稳定.镁处理后,钢中硫含量和全氧含量都明显降低,镁的加入起到显著的脱硫和脱氧效果.同时,钢中的夹杂物成分也变化明显,单相的Al2O3和Mn S夹杂物基本消失,转变为Mg S或者Mg O为核心的夹杂物,有些外面包裹着Mn S;或者是以Mg O·Al2O3尖晶石为核心,外面包裹着低熔点Mn S的复合夹杂物.It has received more and more attention to produce super clean steel and improve the microstructure and mechanical properties of steel by using Mg treatment. But currently,adding Mg into steel melt usually causes violent reaction,the yield of Mg is very small and instable,so that the experimental requirements can not be satisfied. In this paper,aimed at super high strength steel 300 M,the intermediate alloys of Ni-Mg-Fe system and Ni-Mg-Mo-Fe system with Mg mass percentage about 5% were prepared by using metal pow der,and the crucible experiments were carried out with a resistance furnace. The results indicated that whether briquette of Ni-Mg-Fe system or Ni-Mg-Mo-Fe system,the yields of Mg far exceed presupposed 5%,and the amount of dissolved of Mg basically reached stable. Added Mg could realize prominent desulfurization and deoxidization effects,the mass percentage of S and total oxygen（T. O） in the steel reduced significantly. Meanwhile,composition of inclusions obviously changed in the steels. The monophasic Al2O3 and MnS inclusions practically vanished and transformed to complex inclusions mainly composed of a center of MgS or MgOand a periphery MnS or composed of a center of MgO·Al2O3and a periphery low melting point MnS.

关 键 词：炼钢 含镁合金 超高强度钢 镁收得率 

分 类 号：TF704.2[冶金工程—钢铁冶金]