Method for reducing head-tail temperature difference of directly-rolled square billet

The embodiment of the invention provides a method for reducing the temperature difference between the head and the tail of a square billet subjected to direct rolling, which comprises the following steps of: when the square billet is subjected to direct rolling, increasing the pulling speed of the square billet to 4 meters per second by adopting an eight-machine eight-flow mode, and shortening the cooling time of the head of the square billet by 45 seconds; high-temperature-resistant alloy ground rollers are used for forming an ejection roller way, two vertical heat preservation roller ways are symmetrically arranged along the two sides of the ejection roller way with the ejection roller way as the center, and when the square billet passes through the ejection roller way, heat preservation is conducted on the head of the square billet by moving the heat preservation roller ways, and heat dissipation is conducted on the tail of the square billet. 本发明实施例提供一种减少直轧方坯头尾温差的方法，包括：在方坯直轧时，采用8机8流模式，以将所述方坯的拉速提高到4米/秒，使所述方