利用Zr-Ti复合脱氧技术生产低温压力容器钢  

Development of low temperature pressure vessel steel by Zr-Ti combined deoxidization technology

作　　者：王博 李铸铁 伊萨耶夫·欧列格 吴开明[3] 战东平[4] 

机构地区：[1]烟台南山学院工学院,山东龙口265713 [2]山东南山铝业股份有限公司技术中心,山东龙口265701 [3]武汉科技大学国际钢铁研究院,湖北武汉430081 [4]东北大学冶金学院,辽宁沈阳110004

出　　处：《钢铁》2018年第2期67-72,共6页Iron and Steel

基　　金：国家自然科学基金资助项目(50734004);山东省技术创新资助项目(200910612004)

摘　　要：为了考察Zr-Ti氧化物质点对钢力学性能的影响,在转炉→LF/RH精炼→板坯连铸→控轧控冷→调质热处理工序,以Zr-Ti复合脱氧代替铝脱氧技术生产了一种低温压力容器钢。对该钢进行了金相显微镜、扫描电镜观察、能谱分析和各项力学性能检测,试验结果表明,钢中生成了尺寸细小的Zr-Ti复合氧硫化物夹杂;钢的内部显微组织主要为贝氏体和少量的针状铁素体,组织均匀,晶粒尺寸小,晶粒度达到9级以上;该钢力学性能优异,横向、纵向力学性能趋同,尤其是低温冲击韧性突出,-60℃冲击功高达100 J以上,韧脆转变温度低于-55℃。因此,Zr-Ti复合脱氧技术对钢起到了细化晶粒、均匀组织的作用。In order to investigate the effect of Zr-Ti oxides on the mechanical properties of steel,the low temperature pressure vessel steel was manufactured by Zr-Ti combined deoxidization technology replacing Al deoxidization in the process of LD-LF/RH-CC-TMCP-QT. Metallographic microscope,SEM,EDS and mechanical property tests were carried out. The results showed that the fine Zr-Ti compound oxide-sulfide inclusions were formed. The microstructure consisted of predominantly bainite and lots of acicular ferrite,which was homogeneous and fine,with the grain size being more than grade 9. The investigated steel had superior mechanical properties especially the low temperature impact toughness. Its mechanical properties were almost isotropic in transverse and longitudinal directions. The impact absorbed energy reached above 100 J at the temperature of -60 ℃and the DBTT（ductile brittle transition temperature）was lower than -55 ℃. Thus the Zr-Ti combined deoxidization technology had the effect of grain refinement and microstructure homogenization on the steel.

关 键 词：Zr-Ti复合脱氧 压力容器钢 低温韧性 MnS夹杂物 

分 类 号：TF76[冶金工程—钢铁冶金] TG335[金属学及工艺—金属压力加工]