During the solidification of high-alloy steel (0.4C–1.5Mn–2Cr–0.35Mo–1.5Ni), the high temperature gradient of solidified shell as well as the columnar crystal development would contribute to the centre segregation and cracking due to the high carbon and alloy contents. The effect of soft reduction process on the segregation of a 400 mm thick high-alloy steel slab was analysed. Industrial trials in a steel mill were performed combining with segregation analysis. The inner quality of the high-alloy steel slab produced through the optimised soft reduction procedures and had a significant improvement in centre segregation. The reduction amount is increased from 20% of solid phase fraction, to avoid the segregation due to the long liquid core, and the reduction rate is deceased from 1.35 to 0.88 mm/m as well. This operation would contribute to the symmetrical distribution of solute element and decrease the segregation to avoid the cracking. An obvious improvement in centre segregation to mainly 1.0 class of high-alloy slab after procedure optimization was achieved. The quality improvement of slab would ensure the quality of downstream forging.

在高合金钢（0.4C–1.5Mn–2Cr–0.35Mo–1.5Ni）的凝固过程中，凝固壳的高温梯度以及柱状晶体的发展将导致中心偏析和开裂。碳和合金含量。分析了轻压下工艺对400 mm厚高合金钢坯偏析的影响。结合偏析分析在钢厂进行了工业试验。通过优化的软压下程序生产的高合金板坯的内部质量，并显着改善了中心偏析。减少量从固相分数的20％增加，以避免由于长的液芯而引起的偏析，并且减少率也从1.35减小到0.88mm / m。该操作将有助于溶质元素的对称分布并减少偏析以避免开裂。经过程序优化后，中心偏析明显改善到主要为1.0级的高合金板坯。板坯的质量改进将确保下游锻件的质量。