400mm特厚板坯3D喷淋技术开发与应用

Technical development and application of 3D spray technology for 400mm ultra-thick slabs

分析了板坯厚度和3D喷淋技术对400 mm特厚板坯角横裂纹的影响。研究表明,对于400 mm特厚板坯,钢的第Ⅲ脆性区的力学性能,是产生角横裂纹的内因;矫直段铸坯角部冷却强度过大是形成角横裂纹的外因。在此基础上,提出了改善400 mm特厚板坯角横裂纹的有效措施,经实施应用后,明显减轻了400 mm特厚板坯角横裂纹缺陷,钢坯切角率降低到0.35%,有效改善了钢坯的表面质量。

Influences of slab thickness and 3D spray technology on the transverse corner cracks are analyzed. Results show that for the 400 mm ultrathick slab the mechanical properties in the low ductility region III are the internal cause and the over high cooling intensity at the corner of the slab in the leveling section is the external one for the transverse corner cracks. Thereupon a few effective measures for improvement in the transverse cracks of the 400 mm ultrathick slab are put forward. The transverse corner cracks of the slab are obviously reduced and the notching rate of the slabs is down to 0.35 % and the surface quality of slabs effectively improved.