Method for producing light oxidation annealed plate on continuous annealing production line

Abstract

A method for producing a light oxidation annealed plate on a continuous annealing production line belongs to the technical field of metallurgical plate production and is used for solving the problem of producing the light oxidation annealed plate with even oxidation layer and stable product quality on the continuous annealing production line. The technical scheme in the invention comprises the steps of preheating, heating, soaking, spray air-cooled oxidation and the like, wherein the spray air-cooled oxidation step is finished at the cooling section of an annealing furnace, the plate temperature of a band steel entering into the cooling section is 700+ / -20 DEG C, a spray air-cooled blower at the head part of the cooling section blows nitrogen gas, a spray air-cooled blower at the middle part of the cooling section blows mixed gases of nitrogen gas and compressed air, a spray air-cooled blower at the tail part of the cooling section blows nitrogen gas, and the plate temperature of the band steel entering into the spray air-cooled blower in the middle is 600-650 DEG C. The invention broadens the existing product structure of the continuous annealing production line, is favor of improving enterprise market competitiveness, and creates considerable economic benefit for enterprises while satisfying various requirements of users.

Description

technical field [0001] The invention relates to a steel plate production process, in particular to a method for producing weakly oxidized annealed plates in a continuous annealing production line, belonging to the technical field of metallurgical plate production. Background technique [0002] Weak oxidation annealed plate is different from general annealed plate. In addition to certain mechanical properties, its products also require surface oxidation reaction to produce a dense oxide layer with a thickness of about 10 microns, thereby improving the surface corrosion resistance of the annealed plate. This product is mainly used in construction, steel structure, household appliances, automobile and other industries. The weakly oxidized annealed plates commonly used at present are produced by discontinuous annealing (i.e. coal annealing process). , The heating furnace uses coal as the heating material, and the atmosphere in the furnace is normal air environment. The steel pl...

AI Technical Summary

Problems solved by technology

It is a bold attempt to use continuous annealing production lines (including galvanizing and annealing dual-purpose production lines) to produce weakly oxidized annealed coils. It requires major adjustments to the current annealing process according to the characteristics of the production line equipment, especially the atmosphere in the furnace. The state and the oxidation process in the furnace are not well controlled, and it is difficult to form a dense oxide layer on the surface of the substrate that meets the thickness requirements.