本文介绍了提高镇静钢成坯率的新途径——“SJB”(宽向缩小绝热板保温帽)法的理论依据和设计方法。通过结晶模拟实验证实了采用此法可在保证钢坯质量的条件下,大幅度提高钢锭成材率(扁锭3～5%、方锭2～3%)。通过铅锭模拟实验,掌握了新锭型的变形特点和最佳锭型尺寸。该方法目前已在我国太钢、长城钢厂和大连钢厂等许多企业实施,效果显著。 This paper introduces a new way to improve the billet percentage of killed steel - the theoretical basis and design method of SJB method. Crystallization simulation experiments confirmed that this method can greatly improve the ingot ingot yield (3 to 5% of ingot and 2 to 3% of ingot) under the condition of ensuring the quality of billet. Through the lead ingot simulation experiment, mastered the deformation characteristics of the new ingot and the best ingot size. This method has been implemented in many enterprises such as Taiyuan Iron and Steel Co., Ltd., Great Wall Steel Plant and Dalian Steel Plant with remarkable results.