保护渣添加剂组成对M2高速钢模铸锭表面质量的影响  

Influence of Additive Composition of Protective Slag on Surface Quality of M2 High Speed Steel Mold Ingot

作　　者：忽金钊 Hu Jinzhao(Steelmaking branch plant,Heye Science and Technology Co.,Ltd.,Shijiazhuang 052165)

机构地区：[1]河冶科技股份有限公司炼钢分厂,石家庄052165

出　　处：《特殊钢》2023年第3期59-63,共5页Special Steel

摘　　要：介绍了模铸对保护渣的要求及常用添加剂的作用,并根据M2高速钢的成分、熔点等特性,通过向通用型模铸保护渣中添加萤石粉、碱粉和可膨胀石墨,对保护渣的熔点、黏度、铺展性进行调整,在生产中进行了大量试验。当单独添加萤石粉7%以上或同时添加萤石粉、碱粉各4%以上时,M2高速钢模铸锭表面粘渣面积比例降低至2%,但锭身恶化严重,出现超5%的凹坑;当萤石粉、碱粉及可膨胀石墨均添加4%时,铸锭表面粘渣面积比例降低至0%,锭身表面良好,满足了M2模铸高速钢的使用要求。适合M2系列高速钢模铸保护渣的化学成分为(18~21)%TC,(29~34)%SiO_(2),(14~17)%Al2O3,(12~15)%CaO,(4~7)%Na_(2)O,(2~4)%Fe_(2)O_(3),(1~3)%MgO,(2~4)%F,(0.5~2)%K2O。This paper introduces the requirement of mold casting on protection slag and the function of commonly used additives,and according to the character such as composition,melting point of M2 high speed steel,fluorite powder,alkali powder and expandable graphite are added to the universal mold casting protective slag,and the melting point,viscosity and spread of the protective slag are adjusted,and a lot of tests have been carried out in the production.When fluorite powder is added more than 7%alone,or fluorite powder and alkali powder are added more than 4%at the same time,the proportion of slag area on the surface of M2 high speed steel mold ingot is reduced to 2%,but the ingot body deteriorates seriously,more than 5%of the pits appear.When fluorite powder,alkali powder and expandable graphite are added 4%,the proportion of slag area on the ingot surface is reduced to 0%,and the surface of the ingot body is good,which meets the requirements of M2 Die casting high-speed steel.Suitable for M2 series of die casting high-speed steel protective slag,its chemical composition is(18-21)%TC,(29-34)%SiO_(2),(14-17)%Al_(2)O_(3),(12-15)%CaO,(4-7)%Na_(2)O,(2-4)%Fe2O3,(1-3)%MgO,(2-4)%F,(0.5-2)%K2O.

关 键 词：保护渣 添加剂 模铸 M2高速工具钢 表面质量 

分 类 号：TF777[冶金工程—钢铁冶金]