在4 300 mm宽厚板轧机上进行了低碳海洋平台用钢E40-Z35工业试制,针对钢板心部铁素体晶粒粗大且出现混晶导致低温冲击功和裂纹尖端张开位移(CTOD)值不合的问题,采取增大层流冷却能力、降低终冷温度的措施,抑制心部晶粒长大,消除厚度方向组织差异,最终得到具有良好的低温韧性、抗层状撕裂性能和焊接性能的海洋平台用钢。 Low-carbon marine platform steel E40-Z35 was trial-produced on a 4 300 mm heavy plate mill. In view of the coarse ferrite grains at the core of the steel plate and the mixed crystal, low-temperature impact energy and crack tip open displacement (CTOD) values In order to increase the laminar flow cooling capacity and reduce the final cooling temperature, the core grain growth is inhibited and the difference in the thickness direction is eliminated. Finally, the composite material has good low-temperature toughness, anti-laminar tear property and weldability Marine platform steel.