Manufacturing method of secondary-cold-rolling shadow mask strip steel in thin specification

Abstract

The invention discloses a manufacturing method of secondary-cold-rolling shadow mask strip steel in a thin specification. The manufacturing method comprises the following steps of: carrying out converter steelmaking; carrying out continuous billet casting; carrying out acid washing and cold rolling; preparing a machine set; carrying out continuous annealing; carrying out secondary cold-rolling; degreasing; and finishing and oiling. The mass percentage of each element is controlled in a corresponding range, wherein the mass percentage of C element is controlled to be less than or equal to 0.002%; the plate temperature is 685-705 DEG C and the soaking time lasts for 30-50 seconds in a heating section and a soaking section of the continuous annealing step; and the rolling reduction of secondary cold rolling is 20%-50%. By using the manufacturing method, a shadow mask strip steel product having ultra-low carbon, an thickness of less than or equal to 0.15 mm and better surface quality and use property can be obtained; as a secondary cold rolling process is adopted, the strength and the rigidity of an annealed product can be improved, decarburization and annealing steps can be omitted, the production flow can be shortened, the production cost can be reduced and the energy consumption and the waste discharge can be reduced.

Description

technical field [0001] The invention relates to a method for manufacturing thin-gauge shadow mask strip steel, in particular to a manufacturing method for ultra-low carbon thin-gauge shadow mask strip steel. Background technique [0002] At present, the production method of cold-rolled thin steel sheets for shadow mask materials is: final hot-rolling of ultra-low carbon steel manufactured by steel factories, the final rolling temperature can be higher or lower than the Ar3 transformation point, and then pickled 1. After cold rolling to the specified thickness and degreasing treatment, decarburization annealing is carried out to reduce the carbon content to below 0.0008%, and the secondary cold rolling is carried out at a reduction of 50% or higher to the required thickness of the final product. Due to the traditional process method, high-temperature decarburization annealing process is required between the secondary cold rolling, and most of them use small-scale Sendzimir ro...

AI Technical Summary

Problems solved by technology

Since this patent adopts the production method of Nb and Ti composite carbon fixation, in order to ensure complete decarburization to obtain good anti-aging performance, it requires a higher continuous annealing temperature, which is easy to increase the production of strip steel materials in the furnace. Occurrence of curvature and various surface defects

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