钛微合金化X70管线钢的研制开发  

Research and Development of Titanium Microalloyed X70 Pipeline Steel

作　　者：李国宝 夏继年 LI Guobao;XIA Jinian(The Iron and Steel Research Institute of Shandong Iron and Steel Group Rizhao Co.,Ltd.,Rizhao 276800,China)

机构地区：[1]山东钢铁集团日照有限公司钢铁研究院,山东日照276800

出　　处：《山东冶金》2023年第4期10-13,共4页Shandong Metallurgy

摘　　要：通过钛-铌复合微合金化经济型成分设计、洁净钢冶炼技术及恰当的TMCP工艺,充分发挥钛、铌微合金元素的析出强化作用和细晶强化作用,获得均匀细小的针状铁素体组织,在晶粒内部弥散分布着纳米级含钛析出相,在成本显著降低的基础上,成功研发出综合性能优异的X70级管线钢热轧卷板。检验结果表明,产品的微观组织优良,力学性能稳定,低温冲击和落锤性能优异,具有高强韧性能匹配。Through the economic composition design of titanium and niobium composite microalloying,clean steel smelting technology,and appropriate TMCP process,the precipitation strengthening effect and fine grain strengthening effect of titanium and niobium microalloying elements are fully utilized to obtain uniform and fine acicular ferrite structure,and nanoscale titanium containing precipitates are dispersed within the grains.On the basis of significantly reducing costs,X70 grade pipeline steel hot-rolled coils with excellent comprehensive performance have been successfully developed.The test results indicate that the product has ideal microstructure,stable mechanical properties,excellent low-temperature charpy v-notch(CVN)impact properties and drop-weight tear test(DWTT)properties,and a matching of high strength and toughness.

关 键 词：钛微合金化 X70管线钢 针状铁素体 纳米级析出相 高强韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]