高速铁路车轴用25CrMoVNi超低氧钢RH精炼过程非金属夹杂物的行为  

Behavior of Nonmetallic Inclusions in Ultra-Low Oxygen Steel 25CrMoVNi for High Speed Rail Axles during RH Refining Process

作　　者：魏鹏远[1] 姜敏[1] 杨叠[1] 王新华[1] 孙维[2] 汪开忠[2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]马鞍山钢铁股份有限公司技术中心,马鞍山243000

出　　处：《特殊钢》2015年第3期1-4,共4页Special Steel

摘　　要：25CrMoVNi钢由120 t EAF-LF-RH脱气-φ600 mm圆坯连铸工艺生产,EAF出钢时加Al预脱气使[Al]s≥0.030%,并加入石灰造渣预精炼,LF精炼时炉渣表面加Al粒扩散脱氧,LF精炼渣的组成为(/%):53~57CaO,10~13SiO_2,27~28Al_2O_3,6~9MgO,0.09~0.10MnO。RH脱气精炼结果表明,RH后T[O]由脱气前0.001 3%~0.001 5%降至0.000 5%;钢中TCa由0.001 9%降至0.000 9%~0.001 7%;夹杂物发生MgO·Al_2O_3→(MgO)z(CaO)x(Al_2O_3)y→(CaO)x(Al_2O_3)y的转变;最后以尖晶石类固相夹杂物数量迅速减少,以钙铝酸盐类的液相夹杂物数量呈现出先增加后减少,钢中夹杂物由6.7个/mm^2下降至2.7个/mm^2。The steel 25 CrMoVNi is produced by 120 t EAF-LF-RH degassing-φ600 mm round bloom casting process with adding Al to pre-deoxidize during EAF tapping,and get[Al]s≥0.030% and adding lime slagging for pre-refining,adding aluminium shot at surface of refining slag（/%：53 57 CaO,10 13SiO2,27 28Al2O3,6 9MgO,0.09 0.10MnO） for diffusion deoxidation during LF refining.The RH degassing refining results show that at end RH process the T[O]decreases from begining RH 0.001 3%- 0.001 5%to 0.000 5%;TCa in steel decreases From 0.001 9% to 0.000 9%0.0017%;the inclusions transform from MgO·Al2O3 to（MgO） z（CaO） x（Al2O3） y and into（CaO） x（Al2O3）y,finally the amount of spinel type solid phase inclusions decreases rapidly,the amount of calcium aluminate type liquid phase inclusions increases first and then decreases,and the number density of inclusions in steel decreases from6.7/mm2 to 2.7/mm2.

关 键 词：120 t EAF-LF-RH-CC流程 RH脱气 超低氧高铁车轴钢 夹杂物 尖晶石 

分 类 号：TF769.4[冶金工程—钢铁冶金]