冷却工艺对高强度管线钢组织和性能的影响  

Effect of Cooling Process on Microstructure and Properties of High-strength Pipeline Steel

作　　者：肖彦忠[1] 孔德南[2] 王军[2] Xiao Yanzhong;Kong Denan;Wang Jun(Anyang Iron&Steel Stock Co.,Ltd)

机构地区：[1]安阳钢铁股份有限公司第二炼轧厂 [2]安阳钢铁股份有限公司

出　　处：《特钢技术》2020年第2期6-9,共4页Special Steel Technology

摘　　要：高强度管线钢为了保证优良的低温韧性和焊接性,一般设计组织为针状铁素体组织。本文基于炉卷机组层流冷却,试验了采用分段冷却工艺的21mm规格X70管线钢,探讨了冷却工艺对高强度管线钢组织和性能的影响。试验结果显示,利用层流冷却分段冷却的方式可在针状铁素体组织中,增加细小的等轴铁素体比例,低温韧性得到改善。In order to ensure excellent low temperature toughness and weldability,high-strength pipeline steel is generally designed as a kind of steel with microstructure of acicular ferrite.Based on the laminar cooling of the furnace coil unit,the X70 pipeline steel of 21mm size with the sectional cooling process was tested,and the effect of the cooling process on the structure and properties of the high-strength pipeline steel was disccussed.The test results show that the laminar stage cooling can increase the proportion of fine equiaxed ferrite in the acicular ferrite structure,and the low temperature toughness is improved.

关 键 词：管线钢 层流冷却 针状铁素体 驰豫 组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG335.1[金属学及工艺—金属材料]