Hot-dip galvanized steel strip for light steel with strength of 600MPa and preparation method thereof

Abstract

The invention discloses a hot-dip galvanized steel strip for light steel with the strength of 600MPa and a preparation method thereof. The hot-dip galvanized steel strip comprises the following chemical components of, by mass,0.05%-0.1% of C, 0.05%-0.25% of Si, 1.0%-1.3% of Mn, less than or equal to 0.03% of P, less than or equal to 0.02% of S, 0.015%-0.055% of Als, 0.01%-0.02% of Nb and the balance Fe and inevitable impurities. The preparation method comprises the procedures of steelmaking, hot rolling, acid rolling and annealing, wherein the annealing process adopts an improved Sendzimir method horizontal annealing furnace for online annealing treatment, a direct combustion section, a radiation section and a cooling section are involved, a semi-annealing process is used, the annealing temperature of a plate strip in the direct combustion section is 550-610 DEG C, the temperature of the plate strip in the radiation section is 510-570 DEG C, and the target temperature control range of the plate strip with the same thickness can reach + / -5 DEG C. The yield strength of a hot-dip galvanized steel product is larger than or equal to 600 MPa, the tensile strength is larger than or equal to 640 MPa, the elongation A80 is larger than or equal to 10%, and the hot-dip galvanized steel product is stable in process, stable in performance, high in elongation guarantee value, low in production cost and suitable for being used as a cold-roll forming thin-wall type light steel raw material such as light steel keels, container doors and anti-theft doors.

Description

technical field [0001] The invention belongs to the technical field of preparation of galvanized steel strips, and in particular relates to a hot-dip galvanized steel strip for light steel with a strength of 600MPa and a preparation method thereof. Background technique [0002] Light steel buildings have the advantages of earthquake resistance, wind resistance, durability, green and low-carbon environmental protection, etc., and have attracted more and more attention from the construction industry at home and abroad. , The market demand for low-carbon buildings conforms to the development trend of China's housing industrialization, and is more and more respected by the people. [0003] At present, some 600MPa light steel buildings on the market adopt the conventional semi-annealing process, and the performance of the strip fluctuates relatively greatly. When the strength is high, the elongation is close to zero, which makes it difficult for customers to process. At the same...

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Problems solved by technology

[0005] The Chinese patent with the publication number CN110541107A discloses a hot-dip galvalume steel sheet with a tensile strength of 600 MPa and its manufacturing method. The continuous annealing furnace is heated by a vertical full-radiant tube, and the production cost is relatively high; The special annealing process adopted by the steel plate, its metallographic structure is ferrite, the volume percentage content is 3-5% martensite, cementite and fine titanium carbonitride precipitates, the process is more complicated and the control is more difficult high

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