Microstructure and Properties of Grade 700MPa Pressure Vessel Steel with Large Heat Input Welding
The microstructure and properties of grade 700MPa steel with large heat input welding and its heat affected zone (HAZ) were investigated by use of the metallography,scanning electron microscopy,mechanical testing and welding thermal simulation.The results showed that the mechanical properties of the steel meet the technical requirements,namely the yield strength PeL≥570 MPa,the tensile strength 685MPa≤Rm≤830MPa,the elongation A≥17%,the-20℃ impact energy KV2≥54J and the-20℃ impact energy of HAZ≥47J.The steel also had good match between strength,toughness and anti-high heat input welding,the microstructure was tempered sorbite with small dispersed composite inclusions,which promoted the formation of acicular ferrite and were beneficial to the improvement of HAZ toughness.
Large Heat Input Microstructure Property Acicular Ferrite
Ding Qingfeng Wang Tiansheng Liu Wenyan Wang Xianjun Liu Wenbin Li Ming
School of Materials Science and Engineering,Yanshan University,China;Research and Development Center School of Materials Science and Engineering,Yanshan University,China Research and Development Center of Wuhan Iron and Steel (Group) Corp.,China Wuhan Iron and Steel (Group) Corp.,China
国际会议
沈阳
英文
1537-1540
2012-09-07（万方平台首次上网日期，不代表论文的发表时间）