A Production Method for Controlling Cold Warpage of Thin and Wide Soft Galvanized Strip Steel

Abstract

The invention relates to a production method capable of controlling the buckling of a thin broad soft zinc-coated strip steel during the cooling process, and aims to solve the technical problem that a soft zinc-coated strip steel buckles during the cooling process after annealing in a horizontal furnace in the prior art. The production method comprises the following steps: preparing a thin broad soft zinc-coated strip steel, which is composed of the following chemical elements in percentage by weight: 0.0005 to 0.0025% of C, 0.05 to 0.20% of Mn, 0.030 to 0.080% of Ti, and the balance being Fe and inevitable impurity elements; controlling the compression ratio of the cold rolling product in a range of 60 to 85%, carrying out annealing on the rolled steel in a horizontal furnace after the cold rolling, controlling the heating temperature of strip steel in a range of 680 to 700 DEG C, carrying out annealing in a range of 810 to 850 DEG C, carrying out annealing for 36 to 60 seconds, controlling the tensile force of the strip steel in a range of 3 to 6 KN; cooling the annealed strip steel in different stages: cooling the strip steel to a temperature of 690 to 750 DEG C at a cooling speed of 9.8 to 18 DEG C / S, and then cooling the strip steel to a temperature of 480 to 560 DEG C at a cooling speed of 10 to 27 DEG C / S; then carrying out galvanization in a zinc boiler with a temperature of 460 DEG C, taking out the galvanized strip steel out of the zinc boiler, cooling the strip steel in the air to a room temperature, and then rolling the strip steel so as to obtain zinc-coated steel rolls. The provided method is suitable for cooling process after annealing in the production of soft zinc-coated strip steel.

Description

technical field [0001] The invention relates to a production method for controlling the cold bending of thin and wide soft galvanized strip steel. Through the research of material properties under high temperature conditions, combined with the test of the cooling process after annealing in the annealing furnace, a method suitable for controlling the soft galvanized strip is found. The method of steel cooling and bending is suitable for the annealing and cooling manufacturing process of soft galvanized products. Background technique [0002] With the continuous optimization of product structure design in domestic home appliances and hardware industries, more and more spare parts are characterized by complex structures and difficult molding. At the same time, the improvement of molding requirements also puts forward higher and higher requirements for raw materials. , hot-dip galvanized products are the most widely used, because of the good ductility of the zinc layer material,...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a production method for controlling the cold warpage of thin and wide soft galvanized steel strip, which mainly solves the technology of warping in the cooling process of soft galvanized strip steel after annealing in a horizontal furnace in the prior art question

[0007] The present invention has been researched and analyzed on the high-temperature properties of materials in the laboratory, combined with the existing cooling process after annealing in the existing horizontal annealing furnace to carry out tests, and solves the technical problem of buckling in the production process of soft galvanized steel sheets with a thin-width ratio in the range of 2400-3000

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