大直径厚壁X70QS钢级管线用无缝钢管的在线热处理工艺研究  

Study on On-line Heat Treatment Process for Large-sized Heavy-wall X70QS Seamless Linepipe

作　　者：黄电源[1] 张业圣[1] 

机构地区：[1]衡阳华菱钢管有限公司技术中心,湖南衡阳421001

出　　处：《钢管》2015年第6期21-25,共5页Steel Pipe

摘　　要：介绍了大直径厚壁X70QS钢级管线用无缝钢管的化学成分及在线淬火热处理工艺,对比分析了在线淬火和离线淬火对X70QS钢级管线用无缝钢管组织与性能的影响。分析认为:采用轧制后的再加热+定径在线淬火热处理工艺,使得X70QS钢级管线用无缝钢管的表层和心部均获得针状铁素体组织,其强度、韧性和耐蚀性能优良。Briefly described here in the paper are the chemical composition of and on-line heat treatment process for the large-sized, heavy-wall X70QS seamless linepipe. Also comparatively analyzed are the effects on the said pipe＇s structures and properties by the on-line quench process and the off-line quench process separately. The analysis leads to such a conclusion that thanks to employment of the on-line quench treatment process following postrolling reheating＋sizing, the said pipe possesses acieular ferrite structures both in its outer layer and core area, which brings about excellent strength, toughness and corrosion resistance.

关 键 词：管线用无缝钢管 X70QS钢级 大直径 厚壁 在线热处理 定径 针状铁素体 

分 类 号：TG161[金属学及工艺—热处理]