Abstract:The major mechanical property failures of high strength super- thick steel plate are summarized, and the factors caused the unqualified performance in the production process are analyzed. To solve the low- temperature impact failure of heavy plates, experiments of different slab model have been applied, and the influence of slab model and rolling schedule for low- temperature impact is discussed. The results show that when applying different cross- section in the production, the low- temperature impact toughness of wide- section slab is better than that of narrow- section. And under the condition of the same production process, adjusting the slab model and increasing the rate of longitudinal rolling reduction can improve the steel plate impact toughness at low temperature.