Surface iron scale control method for middle sheet billet continuous casting and rolling steel plate

Abstract

The invention discloses a controlling method of iron oxide sheet of rolled band steel surface of middle-thin board blank, which is characterized by the following: controlling component; proceeding heat load directly; heating to remove phosphor; rolling under high temperature; forcing to cool; controlling Si content in the steel; eliminating red ferric oxide on the surface of heat roll steel; fitting for the steel with not more than 0.18%C, not more than 0.20% Si, not more than 1.50% Mn, not more than 0.015% P, not more than 0.01% S and Nb, V and Ti.

Description

technical field [0001] The invention belongs to a steel plate surface treatment technology, in particular to a method for removing surface oxide scales during continuous casting slab heating and rolling. Background technique [0002] During the process of heating, conveying and rolling, due to the reaction with oxygen, a certain amount of iron oxide scale will inevitably be produced on the surface of the casting slab or steel slab. If it cannot be removed well, it will greatly affect the surface quality of the rolled steel plate. Therefore, all manufacturers have given full attention and in-depth research to eliminating the oxide scale on the surface of the billet, and have taken various measures to solve it. [0003] So far, although there are many measures to remove the iron scale on the surface of the billet, almost all solutions adopt a single physical method, that is, mechanical descaling, high-pressure water descaling, shot peening or bending deformation to remove the ...

AI Technical Summary

Problems solved by technology

The disadvantage is that it is necessary to add several special equipment such as pressing rollers and supporting rollers, which increases the investment; the process of leveling and tensioning is added, which increases the production cost; this method is only suitable for the production of cold-rolled strip steel. It is difficult to meet the needs of thicker casting slabs and continuous casting and rolling processes

Its defects: one is to increase facilities and investment; the other is to reduce billet temperature and increase energy consumption;

Once this kind of iron sheet is formed, it is difficult to remove it only by pure physical (mechanical) methods.