Abstract: Taking a certain new built medium breadth hot rolled strip mill as the objection， the principal influencing factors of strip center crown were analyzed. It was presented the predictive model of strip crown， the calculating model of thermal crown and wear and the model of the feedback control for center crown and flatness. In the rolling process of the typical products， the SIN curves of 7-standed work rolls barrel were designed. According to the measured data of strip rolled in site， it was plotted the relative crown profile under the condition of even force distribution and the distribution curve of relative crown of strip in finishing mill. Measured data obtained by multi-functional profile and shape meter showed that 100 percent of the finishing crown of strip was located in the range of (40±20)μm and the flatness of 0I with the tolerance of ±10I was more than 98 percent along strip length.

Key words: hot rolled strip, crown, mathematic model, work roll curve, application in site