40tT型6流中间包结构优化对高碳钢中夹杂物的影响

Influence of Structure Optimization of a 40 t T-Baffled Six-Strand Tundish on Inclusions in High Carbon Steel

通过几何相似1:3的水模型对原中间包和优化的增设挡墙中间包进行去除夹杂物的模拟试验,根据水模拟试验结果,优化了40 t钢包结构并进行高碳钢82A和72A的生产试验。结果表明,增设挡墙优化结构后,中间包内滞止时间和实际停留时间延长,活塞区比例提高,而死区比例减小;中间包结构优化后去除夹杂物的效果明显提高,采用优化的增设挡墙中间包生产的高碳钢Φ5.5 mm盘条中夹杂物数量由原来的2.06~2.52个/mm^2降至0.20~1.06个/mm^2,最大夹杂物尺寸由原来的(9.87~13.37)μm×(6.29~9.44)μm降至(4.01~8.33)μm×(3.41~7.62)μm;铸坯中大型夹杂物数量和尺寸也相应降低。

The simulation test on removing inclusions in original tundish and optimum tundish established an addition- al retaining wall has been carried out by using a geometric similarity 1：3 water model, and based on water-simulated test re- sults, the structure of 40 t tundish is optimuized and the pilot production of high carbon steel 82A and 72A is carried out. Results show that with optimum tundish established an additional retaining wall, the stagnation time and actual retained time are prolonged, the piston area ratio increases and the dead zone ratio reduces; with optimum tundish structure the effect of inclusion removal improves significantly, the inclusion number in Ф5.5 mm coil of high carbon steel produced with optimum tundish established an additional retaining wall decreases from original 2. 06 - 2. 52 inclusion/mm2 to 0. 20 - 1.06 inelusion/mm2, the size of maximum inclusion decreases from original （9. 87 - 13.37 ） μm× （6. 29 -9.44 ） μm to （4.01- 8.33 ） μm× （3.41 - 7. 62 ）μm; the number and size of large inclusions in casting billet also decrease correspondingly.