Industrial development of steel plate suitable for high heat input welding
- 作者：ZHANG YuPAN XinLI Xiaobao
- 会议时间：2013-06-01
- 关键词：thermo-mechanically controlled processing ; intra-granular ferrite ; high heat input welding ; heat affected zone ; impact toughness
- 作者单位：Institute of Research of Iron and Steel ( IRIS ),Jiangsu Shagang Group Co.,Ltd.,Zhangjiagang 215625,Jiangsu,China
- 母体文献：第五届宝钢学术年会论文集
- 会议名称：第五届宝钢学术年会
- 会议地点：上海
- 主办单位：中国金属学会
- 语种：chi
摘要
Steel plate suitable for high heat input welding were industrially produced by employing advanced steel-making technology and thermo-mechanically controlled processing and accelerated cooling technology.A homogenously distributed acicular ferrite microstructure across the thickness direction of the rolled plates was observed,and densely distributed inclusions with a size range from 0.I ~ 3 μm which trigged intra-granular ferrite were revealed.Mechanical properties were measured at quarter and center thickness of the hot rolled steel plate in both transverse and longitudinal direction,which exhibits a yield strength;390 MPa,tensile strength≥510 MPa,elongation≥25%and impact toughness at -60℃≥100 J.Electro-gas welding with a heat input 380 kj/cm was employed to butt weld the 40 mm thick plate,and microstructure and mechanical property of the welded joint were investigated.A narrow coarse grain heat affected zone having a microstructure of 900-/o intra-granular ferrite ( 5 - 15 μm) and 10% grain boundary ferrite (≤5μm in thickness) is found,and its impact toughness at - 20℃≥100 J.The weld joint failed in base metal during tensile test.Satisfactory strength and toughness property of the weld joint implies the good weldability of the plate.