Method for reducing heating decarburization of steel billet

Abstract

The invention discloses a method for reducing heating decarburization of a steel billet, which is implemented according to the following steps of: 1) designing and arranging a set of nitrogen pipeline, introducing nitrogen into a gas burner of a soaking section of a heating furnace, uniformly arranging the nitrogen in the soaking section, and additionally arranging two sets of exhaust flue gas analyzers in the soaking section; (2) a pipeline main valve, a pressure reducing valve and a pneumatic control valve are arranged on the newly added nitrogen pipeline; (3) a nitrogen pipe nozzle is additionally arranged on the gas burner side of the soaking section, so that nitrogen uniformly enters a hearth of the soaking section; according to the method, the atmosphere in the heating furnace can be forcibly adjusted, reasonable heating parameter control is combined, the surface decarburization thickness during billet heating is effectively reduced, and the overall performance of steel is improved.

Description

technical field [0001] The invention relates to a method for reducing the heating decarburization of steel slabs. Background technique [0002] Background technology 1: When rolling steel in a steel plant, the billet needs to be heated in a heating furnace. When heated to a certain temperature, the carbon on the surface of the billet reacts with the media such as oxygen, hydrogen, carbon monoxide and water vapor in the furnace, reducing the carbon on the surface of the billet. concentration, a phenomenon we call decarburization. When the thickness of the decarburized layer on the steel surface is large, the quenching hardness, fatigue strength and wear resistance of the steel will decrease, which will have a significant impact on the properties of the steel. [0003] Background technology 2: Decarburization will occur in the steel billet during the heating process, especially for medium and high carbon steel, which is mainly affected by three aspects: heating temperature, h...

AI Technical Summary

Problems solved by technology

In order to ensure sufficient combustion, the air-fuel ratio is basically controlled at a fixed value, and it is impossible to control the atmosphere in the heating furnace by adjusting the air volume

[0005] Literature search: (1) Simulation study on decarburization during billet heating, Zhang Jingkui, Song Xiaona, Li Mingjie, Chen Haigeng; (2) An experimental method to obtain surface decarburization during steel rolling heating furnace billet heating, Tang Jiarui, Chen Hongxu, Cao Xinchuanzhou; (3) Oxidation and decarburization research and prediction in the heating process of M2 steel, Song Enhancement; From the above literature search, we can see that the current control methods for the decarburization layer thickness are mainly focused on controlling the steelmaking composition and improving the heating temperature, and have not passed the mandatory Relevant literature on adjusting the atmosphere in the soaking section of the heating furnace to reduce the thickness of the decarburized layer