热轧带钢发射率软测量及影响因素分析

根据现场实测带钢温度值，采用温度场反算方法计算了热轧带钢层流冷却之后卷取之前的发射率.主要分析了材料碳当量、带钢厚度、带钢所处的温度区间对发射率的影响.结果表明:带钢所处的温度区间不同，影响带钢发射率的因素不同.在高于550℃的温度区间，不同材质的带钢，其发射率在08±01之间，随材料碳当量的增加，带钢发射率稍微增大，与带钢厚度没有明显的关系；在低于550℃的温度区间，不同材质的带钢，其发射率与碳当量没有明显的关系，但随带钢厚度的增大显著降低.

Emissivity Indirect-Measurement and Analysis for Hot Rolled Strip

Emissivity of hot rolled strip after laminar cooling and before coiling was calculated by temperature field technology which uses Crank Nicolson implicit difference method based on measured temperature data. The effects of carbon equivalent， strip thickness and strip temperature on the emissivity were analyzed. The results showed that the prime influencing factors are different under different strip temperature range. When the temperature is beyond 550℃， the strip emissivity varies between 07 and 09， and with the increasing in carbon equivalent， the accordingly strip emissivity increases smoothly. However， when the temperature is below 550℃， the strip emissivity decreases rapidly with the increasing of strip thickness， and there is no obvious relationship between strip emissivity and carbon equivalent.