低合金特厚钢板轧制复合试验

为满足低合金钢板大单重、特厚规格的市场需求，依托轧制复合工艺开展采用复合连铸板坯生产特厚钢板的试验研究，通过对连铸板坯进行复合组坯及轧制获得特厚钢板。综合试验和分析结果表明，采用轧制复合工艺生产的特厚钢板结合界面复合良好，结合界面区域晶粒发生了充分的再结晶，实现了原子层级的冶金结合；z向(厚度方向)拉伸性能满足Z35要求，局部断面收缩率因结合界面微区存在的带状分布氧化物而偏低。

Experimental study of roll composite for low-alloy ultra-heavy steel plate

In order to meet the market demand of low-alloy steel plate with large single weight and ultra-heavy specifications, the experimental study of ultra-heavy steel plate produced by composite continuous casting slab was carried out by the rolling composite process. Ultra-heavy steel plates were obtained through rolling from composite slab. The comprehensive test and analysis show that the interface bonding of ultra-heavy steel plate produced by rolling composite process is good, and metallurgical bonding at atomic level is achieved with the sufficient recrystallization of grain at the bonding interface. The z-direction tensile properties meet the requirements of Z35, but the local reduction of area is low due to the existence of band-distributed oxides at the bonding interface microregion.