连铸电磁搅拌和轻压下对气瓶钢34CrMo4冶金质量的影响  

Effect of Casting Electromagnetic Stirring and Light Reduction on Metallurgical Quality of Gas Cylinder Steel 34CrMo4

作　　者：卢秉军 齐峰 沈万林 刘军 

机构地区：[1]本钢板材股份有限公司产品研究院,本溪117000 [2]焦作金鑫恒拓新材料股份有限公司,焦作454450 [3]本钢板材股份有限公司炼钢厂,本溪117000

出　　处：《特殊钢》2017年第5期40-43,共4页Special Steel

摘　　要：气瓶钢34CrMo4的生产工艺流程为铁水预处理-180 t BOF-LF-RH-350 mm×470 mm坯连铸。对4流连铸分别采用结晶器电磁搅拌(M-EMS,480 A,2 Hz);M-EMS+凝固末端电流搅拌(E-EMS,320 A,6 Hz);M-EMS+轻压下(LR,3 mm-4 mm-3 mm)以及M-EMS+E-EMS+LR进行工业试验,得出M-EMS(480 A,2 Hz)+E-EMS(320A,6 Hz)+3-4-3(mm)轻压下工艺,有效提升连铸坯内部冶金质量。9炉生产结果表明,该流程生产的气瓶钢34CrMo4的抗拉强度达1 070~1 159 MPa,钢中氧含量≤0.002 0%,采用M-EMS+E-EMS+LR连铸工艺时,该钢具有高致密度,铸坯中心疏松级别≤1.0。The production flowsheet for gas cylinder steel 34CrMo4 is hot-metal pretreatment- 180 t BOF- LF- RH- 350 mm × 470 mm blooms casting. The pilot production is carried out on 4-strands casting respectively by using mold electromagnetic stirring （ M-EMS, 480 A, 2 Hz） ; M-EMS ＋ solidification end electromagnetic stirring （ E-EMS, 320 A, 6 Hz） ; M-EMS ＋ light reduction （ LR, 3 ram-4 mm-3 ram） and M-EMS ＋ E-EMS ＋ LR process, it is obtained that the process with M-EMS （480 A, 2 Hz） ＋E-EMS （320 A, 6 Hz） ＋3-4-3（mm） light reduction is available to improve the internal metallurgical quality of casting bloom. 9 heats commercial production results show that the tensile strength of gas cylinder steel 34CrMo4 steelmaking by the flowsheet is up to 1 070 - 1 159 MPa and oxygen content in steel is ≤0.002 0% , and by using M-EMS ＋ E-EMS ＋ LR casting process the steel has high density and the rating of center porosity of bloom is ≤1.0.

关 键 词：气瓶钢34CrMo4 180 t BOF-LF-RH-CC流程 电磁搅拌 轻压下 中心疏松 

分 类 号：TF777[冶金工程—钢铁冶金]