微合金化在正火态管线用无缝钢管中的应用  

Application of Micro-alloying to Manufacture of As-normalized Seamless Steel Linepipes

作　　者：徐永康 刘耀恒[2] 

机构地区：[1]中国石油塔里木油田分公司物资采办事业部,新疆库尔勒841000 [2]宝山钢铁股份有限公司,上海201900

出　　处：《钢管》2015年第4期11-15,共5页Steel Pipe

摘　　要：研究了微合金元素Nb、V、Ti在正火态管线用无缝钢管成分体系中的不同作用及其机理,并分析了C、N等元素对微合金化效果的影响。结果表明:Nb、V、Ti在正火态管线用无缝钢管成分体系中,可有效细化晶粒,并产生析出强化效果,从而提高钢的强韧性;提高氮元素含量可有效提高V的析出强化和细晶强化效果;降低碳含量可有效提高冲击韧性,但在碳当量同等的情况下,会降低强度。Studied here in the essay are the different roles and mechanisms of the micro-alloy elements （i.e., Nb, V and Ti） in the chemical composition system of the as-normalized seamless steel linepipe. Also analyzed is how chemical elements like C and N, etc. affect the micro-alloying result. Accordingly, the facts as following are revealed. In the chemical composition system of the said linepipe, elements Nb, V and Ti can get the grains well refined, and bring about the segregation strengthening effect so as to enhance strength and toughness of the steel. Increasing N content can remarkably enhance the segregation-strengthening and grain refining-strengthening effects by Element V. And reducing C content can obviously enhance impact toughness of the steel, whereas with the same carbon equivalent, the strength might be decreased.

关 键 词：管线用无缝钢管 微合金化 正火态 细化晶粒 析出强化 强韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]