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通过数值模拟和现场实测的方法研究了在连铸、保温输送、堆垛冷却、加热炉加热等工艺过程中325mm×280 mm GCr15轴承钢连铸坯温度的变化。结果表明,铸坯在出拉矫机后的单辊道输送过程不同部位的冷却速率差异较大(角部10℃/min、表面7.1℃/min、芯部4.6℃/min),而在保温车输送过程(角部4℃/min、表面2.9℃/min、芯部1.67℃/min)及堆垛冷却期间不同部位的冷却速率差异较小,因此缩短在连铸机尾部的停留时间有利于防止因冷却不均产生微小裂纹。热送热装较冷装工艺可使铸坯的加热时间减少20 min。
The temperature variation of 325mm × 280mm GCr15 bearing steel continuous casting billet in the processes of continuous casting, thermal insulation transportation, stack cooling and heating furnace heating was studied by means of numerical simulation and field measurement. The results show that the cooling rate varies greatly between different parts of the single roller conveyor after straightening and stretching (corner 10 ℃ / min, surface 7.1 ℃ / min, core 4.6 ℃ / min) The difference in cooling rates between the different parts of the car transport process (corner 4 ° C / min, surface 2.9 ° C / min, core 1.67 ° C / min) and stack cooling is small and thus shortening the residence time in the tail of the caster favors Prevent minor cracks due to uneven cooling. Hot delivery Hot cold loading process can reduce the slab heating time 20 min.