Method for heating sporadic cold steel billets

Abstract

The invention provides a method for heating sporadic cold steel billets, wherein a heating mode of burning steel twice is adopted. The method comprises the following steps of: feeding the cold steel billets in the middle of a plate blank in the process of furnace charging, wherein the planned rolling thickness of the plate blank is more than or equal to 4.0mm; heating the plate blank fed with the cold steel billets and other normal steel billets together to 700 DEG C, then discharging and hoisting the steel billets out of a line by using a resmelting roller; and then carrying out normal furnace charging, heating and rolling on the steel billets which are hoisted out of the line and the other hot steel billets with same specification. According to the method disclosed by the invention, the purposes of shortening the time in furnace of the steel billets and stabilizing the steel burning quality are achieved without additionally increasing any equipment, changing the characteristic that in the continuous casting and rolling production line, the steel billets are directly conveyed for hot charging and influencing normal furnace charging and tapping of subsequent hot steel billets and by using a technological method for reasonably arranging a furnace charging sequence and carrying out secondary heating, therefore not only sporadic contracts can be fulfilled rapidly, but also the coal gas consumption is reduced, and accidents can be prevented from happening.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to a method for heating and burning small batches of cold steel slabs. Background technique [0002] At present, the hot-rolled steel strip production lines at home and abroad generally adopt continuous casting and rolling or billet hot-feeding and hot-charging production processes. Due to the short process flow of continuous casting slab hot delivery and direct loading, in the whole process, the slab heating area is strictly implemented according to the production plan, which plays a link between the preceding and the following. Therefore, the organization of raw materials and the selection of the way of loading and unloading steel have always been the focus of production. In particular, the loading, tapping and heating operation methods of different specifications of hot and cold materials directly affect the quality of the rolling production line and...

AI Technical Summary

Problems solved by technology

For sporadic contracts with small batches, because such contracts use cold steel slabs for heating and rolling, poor arrangements will directly affect the heating of hot-charged steel billets. Therefore, sporadic contracts with small batches are often specially arranged for firing steel and Rolling, so that the cashing time of sporadic contracts with small batches is late, and some even appear to be delayed backwards, which not only damages the reputation of the company, but also affects the use of users