大热输入焊接用钢的组织与力学性能  

Microstructure and Mechanical Properties of High Heat Input Welding Steel

作　　者：张朋彦[1] 高彩茹[1] 朱伏先[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2012年第1期81-85,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金重点资助项目(50834010);国家高技术研究发展计划项目(2009AA032530);教育部科学技术研究重点项目(108036)

摘　　要：为研究大热输入焊接用钢的工业化生产工艺,采用实验室研究的氮化钛和氧化钛微细分散新工艺技术,对冶炼过程中合金的添加顺序和添加时机进行控制,在国内某钢厂进行了大热输入焊接原油储罐用钢的工业生产.通过对传统钢和工业试制钢焊接热模拟和气电立焊实验的冲击韧性对比,分析夹杂物数量、类型及尺寸对焊接热影响区组织的影响.结果表明:钢板的力学性能符合国标要求,屈强比小于0.9,在400 kJ/cm的焊接热输入条件下,熔合线组织为多边形先共析铁素体和晶内大量针状铁素体,具有良好的低温冲击韧性.尺寸为1~3μm的含TiOx-Al2O3-MnS类夹杂物最有利于晶内针状铁素体(IAF)形核.In order to study high heat input welding steels for industrial production processes, a high heat input welding steel for crude oil storage tank was developed in domestic steelworks by titanium nitride and oxide refinement dispersion technology. The process and condition of alloying addition were controlled. The impact toughness of a traditional steel and the trial steel was compared after welding thermal simulation and vertical position gas-electric welding. The effects of density, type and size of inclusion on heat affected zone were analyzed. The results showed that the mechanical properties of this steel meet the demand of national standard, and the yield ratio is below 0.9. The microstructure of fusion line with a heat input of 400 kJ/cm consists of pro- eutectoid polygonal ferrites and numerous acicular ferrites, therefore the welded joints have excellent low temperature toughness. TiO^--A1203-MnS complex inclusions with the size of 1- 3 /~m are the most favorable sites for the nucleation of IAF（intragranular acicular ferrites）.

关 键 词：原油储罐 大热输入焊接 熔合线 夹杂物 针状铁素体 

分 类 号：TG402[金属学及工艺—焊接]