在Gleeble1500热模拟机上测定了Q460C连铸坯的热塑性，深入分析了钢Q460C的高温脆化机理，确定了连铸坯的最佳矫直温度。结果表明，钢Q460C高温脆化受变形速率的影响较大，在第Ⅲ脆性区变形速率越低脆化越严重，实验用钢Q460C的低塑性区确定在660~985 ℃，连铸坯顶弯、矫直温度应高于985 ℃，有利于提高塑性，避免连铸坯表面裂纹的产生。
Hot ductility of Q460C continuously cast slabs was tested by Gleeble1500 thermal strain simulation machine. The results indicated that the strain rate had a great effect on hot ductility of Q460C slab. The plasticity of Q460C steel was reduced with the increase of the strain rate in the third brittle zone. Temperature ranging from 660 ℃ to 985 ℃ was defined to be the low ductility temperature domain of the Q460C slab. Enhancing the temperature over 985 ℃ during bending and strengthening was helpful in improving ductility of Q460C steel and avoiding surface cracks of slab.
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