关键词: 成材率, 模具钢, 钢锭优化设计, 数值模拟

Abstract: Yield rate is an important factor to be considered in the production of rolled ingot for die steel. The redesigns and optimizes of the original 3.0 t die steel ingot used in a steel plant are carried out by using Procast simulation software to simulate the temperature field， total setting time and internal defects during the solidification process， aiming to improve the yield rate under the premise of ensuring quality. The results showed that the total solidification time of new designed 3.1 t ingot is 1.78 h， and that of original 3.0 t ingot is 2.03 h， the total solidification time is reduced by 12.32%， and the ingot internal quality is good. On the premise of covering the existing rolling specifications and without increasing the rolling passes， the number of ingots is reduced from 5 to 4. The newly designed 3.1 t steel ingot is produced in small batch by using 40 t EAF-LF-VD die casting process. After initial rolling， it qualified the GB /T4162-2008 grade B flaw detection specification. The average yield rate of the optimized ingot is 83.76%， the average yield rate of the original ingot is 78.71%， and the average yield rate is 5.05% higher than the original.

Key words: Yield Rate, Die Steel, Ingot Optimization Design, Numerical Simulation