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分析了50钢铸坯异常组织以及在不同温度下的力学性能。分析结果表明,快速和不均匀的冷却将产生尖锐、突出的铁素体组织,弱化晶界,并产生较强的组织应力和热应力;在700、300℃附近分别存在高温脆性区和低温脆性区,在此区间移动铸坯会助长裂纹的产生。采用合适的堆冷工艺,提高热送热装率,可以有效减少铸坯断裂风险。
The abnormal structure of 50 steel slab and the mechanical properties at different temperatures were analyzed. The results show that rapid and inhomogeneous cooling will produce sharp and prominent ferrite microstructure, weaken the grain boundary and produce strong tissue stress and thermal stress. High temperature brittle zone and low temperature brittleness exist near 700 and 300 ℃, respectively District, in this interval will promote the growth of the slab cracks. The use of suitable heap cooling technology to improve the hot delivery rate can effectively reduce the risk of slab fracture.