In the process of hot rolled square steel making, for the control of the temperature must be strictly enforced, otherwise will lead to deformation, and is unable to control the deformation, the size of the products at the same time also can appear the phenomenon of instability, especially the influence of the dimensions of the cycle of very clear, so in order to be able to control all aspects of the finished product quality precision, in the production process must strictly control the good aspects of standard requirements.