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工程科学学报,第38卷,增刊1:1-7,2016年6月 Chinese Journal of Engineering,Vol.38,Suppl.1:1-7,June 2016 DOI:10.13374/j.issn2095-9389.2016.s1.001:http://journals.ustb.edu.cn TP347H精炼渣二次氧化控制及夹杂物变性处理 张乐辰12》,包燕平12四,王敏12》,张超杰12) 1)北京科技大学钢铁治金新技术国家重点实验室,北京1000832)北京科技大学治金与生态工程学院,北京100083 ☒通信作者,E-mail:baoyp@usth.edu.cm 摘要研究了采用E℉+VOD+IC工艺流程生产TP347H不锈钢时由于精炼渣成分产生的二次氧化及其氧化夹杂物的变 性处理过程.试验中VOD精炼过程中采用Al进行终脱氧,降低精炼渣中F0、SiO2含量,精炼渣四元碱度控制在1.3以上,保 证钢中全氧质量分数小于0.003%.脱氧后使用喂CaSi线及钢包软吹的精炼手段,可将硬质Al20,及MgAL0,转变为C0- A1,0,夹杂,减少硬质MgAL,0,夹杂总量并使夹杂物熔点低于1500℃.此类夹杂在炼钢温度下呈液态且更易于聚集与上浮, 而在后续轧制、锻造过程中低熔点夹杂随基体发生形变,减少钢材裂纹的产生, 关键词TP347H;精炼渣:二次氧化:钙处理 分类号TF769.2 Reoxidation control of refining slag and inclusion modification in TP347H stainless steel ZHANG Le-chen,BAO Yan-ping,WANG Min',ZHANG Chaojie) 1)State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China 2)School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:baoyp@ustb.edu.cn ABSTRACT The secondary oxidation caused by compositions of refining slag and Ca treatment on oxide inclusion was studied in TP347H stainless steel by EF VOD IC process.In industrial trials,the aluminum is used as the final deoxidation during VOD process.The Fe0 and SiO,contents in refining are decreased and the quaternary basicity is higher than 1.3.Then the total oxygen content is below 0.003%.With Ca-Si wire feeding and soft blowing the hard Al,O,and MgAl,O,inclusions are transformed to CaO- -Al,O,inclusion.The amount of MgAl,O,inclusion is reduced and the melting point of inclusion is below 1500 C.This kind of inclu- sion is liquid during steelmaking process and it is easy to coalescence and flotation.And in the following rolling and forging process the inclusions have a little deforming ability with the matrix deformed and prevent the ingot crack. KEY WORDS TP347H:refining slag:secondary oxidation:Ca treatment 随着对高品质不锈洁净钢质量要求的不断提高, 较低还应控制夹杂物的塑性-) 不锈钢洁净度的控制技术及工艺日益受到学者的关 目前,国内外对于不锈钢铝脱氧造渣精炼工艺研 注.不锈钢治炼过程中经常存在铸锭轧制、锻造后开 究较少,且研究方法多采用现场生产试验.研究过 裂,轧材表面存在缺陷而最终产品全氧含量处于较高 程中主要对象多集中于渣钢间反应平衡及钢材全氧含 水平等问题.特别是TP347H主要用于生产锅炉的过 量5-),其对脱氧后不锈钢钢液二次氧化的控制及夹 热管,因此对其产品质量的要求十分苛刻四.为避免 杂物变性没有详细系统的解释.本文通过对现场试验 轧材力学性能的降低,其不仅应保证钢材的全氧含量 结果进行全流程取样分析,特别是对精炼渣成分产生 收稿日期:201601-16 基金项目:中国博士后科学基金资助项目(2014M560890,2015T80039)工程科学学报,第 38 卷,增刊 1: 1--7,2016 年 6 月 Chinese Journal of Engineering,Vol. 38,Suppl. 1: 1--7,June 2016 DOI: 10. 13374 /j. issn2095--9389. 2016. s1. 001; http: / /journals. ustb. edu. cn TP347H 精炼渣二次氧化控制及夹杂物变性处理 张乐辰1,2) ,包燕平1,2) ,王 敏1,2) ,张超杰1,2) 1) 北京科技大学钢铁冶金新技术国家重点实验室,北京 100083 2) 北京科技大学冶金与生态工程学院,北京 100083  通信作者,E-mail: baoyp@ ustb. edu. cn 摘 要 研究了采用 EF + VOD + IC 工艺流程生产 TP347H 不锈钢时由于精炼渣成分产生的二次氧化及其氧化夹杂物的变 性处理过程. 试验中 VOD 精炼过程中采用 Al 进行终脱氧,降低精炼渣中 FeO、SiO2含量,精炼渣四元碱度控制在 1. 3 以上,保 证钢中全氧质量分数小于 0. 003% . 脱氧后使用喂 Ca --Si 线及钢包软吹的精炼手段,可将硬质 Al2O3及 MgAl2O4转变为 CaO-- Al2O3夹杂,减少硬质 MgAl2O4夹杂总量并使夹杂物熔点低于 1500 ℃ . 此类夹杂在炼钢温度下呈液态且更易于聚集与上浮, 而在后续轧制、锻造过程中低熔点夹杂随基体发生形变,减少钢材裂纹的产生. 关键词 TP347H; 精炼渣; 二次氧化; 钙处理 分类号 TF769. 2 Reoxidation control of refining slag and inclusion modification in TP347H stainless steel ZHANG Le-chen1,2) ,BAO Yan-ping1,2)  ,WANG Min1,2) ,ZHANG Chao-jie1,2) 1) State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China 2) School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China  Corresponding author,E-mail: baoyp@ ustb. edu. cn ABSTRACT The secondary oxidation caused by compositions of refining slag and Ca treatment on oxide inclusion was studied in TP347H stainless steel by EF + VOD + IC process. In industrial trials,the aluminum is used as the final deoxidation during VOD process. The FeO and SiO2 contents in refining are decreased and the quaternary basicity is higher than 1. 3. Then the total oxygen content is below 0. 003% . With Ca--Si wire feeding and soft blowing the hard Al2O3 and MgAl2O4 inclusions are transformed to CaO- -Al2O3 inclusion. The amount of MgAl2O4 inclusion is reduced and the melting point of inclusion is below 1500 ℃ . This kind of inclu￾sion is liquid during steelmaking process and it is easy to coalescence and flotation. And in the following rolling and forging process the inclusions have a little deforming ability with the matrix deformed and prevent the ingot crack. KEY WORDS TP347H; refining slag; secondary oxidation; Ca treatment 收稿日期: 2016--01--16 基金项目: 中国博士后科学基金资助项目( 2014M560890,2015T80039) 随着对高品质不锈洁净钢质量要求的不断提高, 不锈钢洁净度的控制技术及工艺日益受到学者的关 注. 不锈钢冶炼过程中经常存在铸锭轧制、锻造后开 裂,轧材表面存在缺陷而最终产品全氧含量处于较高 水平等问题. 特别是 TP347H 主要用于生产锅炉的过 热管,因此对其产品质量的要求十分苛刻[1]. 为避免 轧材力学性能的降低,其不仅应保证钢材的全氧含量 较低还应控制夹杂物的塑性[2--3]. 目前,国内外对于不锈钢铝脱氧造渣精炼工艺研 究较少,且研究方法多采用现场生产试验[4]. 研究过 程中主要对象多集中于渣钢间反应平衡及钢材全氧含 量[5--7],其对脱氧后不锈钢钢液二次氧化的控制及夹 杂物变性没有详细系统的解释. 本文通过对现场试验 结果进行全流程取样分析,特别是对精炼渣成分产生
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