陈振业, 张阔斌, 王云阁, et al. Analysis on Formation of Surface Longitudinal Crack of Steel Q235B and Q345B Medium-Heavy Plate and Process Optimization[J]. Special Steel, 2015, 36(6): 30-32.
陈振业, 张阔斌, 王云阁, et al. Analysis on Formation of Surface Longitudinal Crack of Steel Q235B and Q345B Medium-Heavy Plate and Process Optimization[J]. Special Steel, 2015, 36(6): 30-32.DOI:
0. 010 ~ 0. 040Als) is hot metal pretreatment-120 t converter-LF-220 mm slab casting- rolling process. By analysis it is obtained that the surface cracks of medium-heavy plate originate from cracks of casting slab. With using the process measures including increasing basicity of mold shielding slag from 1.16 to 1. 26
increasing its viscosity at 1 300 °C from 0. 80 Pa·s to 0. 97 Pa·s
soft stirring time no-less than 10 min
controlling casting speed about 1. 0 m/min; liquid surface up and down ≤5 mm; maintaining mold cone 9. 0 mm; liquid superheat extent 20 ~25 °C and secondary water rate 0. 662 L/kg
the ratio of longitudinal cracks of steel Q235B and Q345B medium-heavy plate decreases from original 2.17% to 1. 08%
and the comprehensive qualified ratio of plate products increases to 98. 16% from original 94. 78%.