Abstract：A low carbon micro-alloyed MnCuNiCrMo heavy plate steel was proposed to develop 60mm thick plate with yield strength (YS) of 500 MPa and secured low temperature toughness. The effects of pancaking of austenite and cooling rate on continuous cooling transformation (CCT) behavior of the subject steel were investigated. Integrated industrial production trial consisted of continuous casting of thick slab and thermomechanical control processing (TMCP) of heavy plate employing a 5m width rolling mill was conducted to produce the advanced product. The microstructure of the plate consists of granular bainite (GB)+acicular ferrite (AF) + polygonal ferrite (PF). The room temperature tensile properties in transverse direction are featured by YS greater than 560 MPa, ultimate tensile strength (UTS) greater than 660 MPa and total elongation greater than 20 pct, meanwhile, the area reduction rate in Z direction greater than 76%. The Charpy V notch (CVN) impact toughness in longitudinal direction is greater than 170J at -40℃, while the nil-ductility transition temperature (NDTT) is at -85℃.
陈焕德，刘东升. TMCP型Q500qENH特厚耐候桥梁钢板的工业试制[J]. 钢铁, 2014, 49(4): 69-75.
CHEN Huan-de，LIU Dong-sheng. Industrial Run to Produce TMCP Processed Q500qENH Weathering Heavy Plate for Bridge. Iron and Steel, 2014, 49(4): 69-75.
2014, Vol. 49 
