ISSN：1003-8620

CN：42-1243/TF

主管：中信泰富特钢集团股份有限公司

主办：大冶特殊钢有限公司

特殊钢 ›› 2015, Vol. 36 ›› Issue (3): 1-4.

• 试验研究 •    下一篇

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

魏鹏远1，姜敏1，杨叠1，王新华1，孙维2，汪开忠2   

  1. 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；
  • 收稿日期:2014-12-01 出版日期:2015-06-01 发布日期:2022-08-17
  • 作者简介:魏鹏远(1990-)，男，硕士研究生(北京科技大学),2012年 西安建筑科技大学(本科)毕业,精炼连铸工艺研究。

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

Wei Pengyuan1, Jiang Min1, Yang Die1, Wang Xinhua1 , Sun Wei2 ， Wang Kaizhong2   

  1. 1 School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083;
    2 Technology Center, Ma'anshan Iron and Steel Co Ltd, Ma'ansha 243000
  • Received:2014-12-01 Published:2015-06-01 Online:2022-08-17

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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,10~13SiO2,27~28Al2O3,6~9MgO,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·Al2O3→（MgO）z（CaO）x（Al2O3）y→（CaO）x（Al2O3）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/mm2下降至2.7个/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

Abstract: The steel 25 CrMpVNi 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 - 57CaO, 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. 0013% - 0. 001 5% to 0.0005% ; TCa in steel decreases From 0.001 9% to 0.000 9% - 0. 001 7% ； 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 from 6. 7/mm2 to 2. 7/mm2.

Key words: 120 t EAF-LF-RH-CC Flowsheet, RH Degassing, Ultra-Low Oxygen Steel for High Speed Rail Axles, Inclusions, Spinel

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