论文部分内容阅读
由于铸坯表面与二冷辊列夹持辊发生的间断式接触传热,其表面温度存在一定程度的上下波动.基于J55微合金钢,考虑温度波动的影响,研究了钢在不同热状态下的热塑性.结果表明,高于850℃时温度波动制度下测得的断面收缩率低于常规恒温制度下的测量值,而等于或低于850℃时情况相反.分析了两种不同温度制度下测试结果的差异,认为对于微合金钢,存在着略高于所测钢种Ae3温度的某一分界温度,高于该温度时恒温制度下测得的塑性值相比波动制度下塑性值偏高,而低于该温度时则偏低.这一认识有助于更加合理地制定实际连铸过程的矫直温度.
Due to the discontinuous contact heat transfer between the slab surface and the nip rollers of the two cold rollers, the surface temperature fluctuates to some extent.Based on the effect of temperature fluctuation on the J55 microalloyed steel, The results show that the cross section shrinkage measured under the temperature fluctuation above 850 ℃ is lower than that under the conventional constant temperature system and opposite at 850 ℃ or lower.The effects of two different temperature regimes The difference between the test results shows that for the microalloyed steel there is a certain demarcation temperature slightly higher than the Ae3 temperature of the tested steel above which the plasticity value under the constant temperature regime is higher than the plasticity value under the fluctuating regime , While lower than the temperature is low.This understanding helps to more reasonable to set the actual straightening process straightening temperature.