A kind of low-yield ratio high-strength cold-rolled hot-dip galvanized steel sheet and its manufacturing method
A technology of hot-dip galvanized steel sheet and low yield ratio, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of low yield ratio, high yield ratio, high manufacturing cost, etc., to achieve High production efficiency, simple composition design, simple and reliable production effect
Active Publication Date: 2022-04-15
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology
[0010] The purpose of the present invention is to provide a low yield ratio high-strength cold-rolled hot-dip galvanized steel sheet and its manufacturing method, which mainly solves the high yield ratio and high manufacturing cost of the 350MPa grade cold-rolled hot-dip galvanized steel sheet in the prior art The technical problems meet the needs of the construction and box industry for complex forming and plastic processing of high-strength hot-dip galvanized steel sheets
The cold-rolled hot-dip galvanized steel sheet of the present invention is mainly used for box forming structural parts
Method used
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Embodiment 4
[0056] Example 4 has a yield strength of 346MPa, a tensile strength of 524MPa, an elongation of 36.4%, and a yield strength ratio of 0.66. Through low-cost component design, hot rolling is used to control low-temperature rolling and low-temperature coiling processes, combined with horizontal continuous annealing Furnace rapid heating and annealing technology, rapid cooling after annealing and isothermal technology have realized low-cost and low-yield ratio cold-rolled hot-dip galvanized steel sheet manufacturing.
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Abstract
The invention discloses a low-yield-ratio high-strength cold-rolled hot-dip galvanized steel sheet and a manufacturing method thereof, which mainly solve the problems of high yield ratio and high manufacturing cost of cold-rolled hot-dip galvanized steel sheets with a yield strength of 350 MPa in the prior art question. The present invention provides a low-yield-ratio high-strength cold-rolled hot-dip galvanized steel sheet, the weight percentage of the chemical composition of the substrate is: C: 0.21-0.23%, Si: 0-0.03%, Mn: 1.15-1.25%, P : 0 to 0.015%, S: 0 to 0.015%, and the balance is Fe and unavoidable inclusion elements. The yield strength R of the cold-rolled hot-dip galvanized steel sheet of the present invention P0.2 345 ~ 385MPa, elongation after breaking A 50mm is 35% to 40%, and the yield ratio is 0.6 to 0.7; the cold-rolled hot-dip galvanized steel sheet of the present invention is mainly used for building steel structure components.
Description
technical field [0001] The invention relates to a cold-rolled hot-dip galvanized steel sheet, in particular to a low yield ratio high-strength cold-rolled hot-dip galvanized steel sheet and a manufacturing method thereof, belonging to the technical field of iron-based alloys. Background technique [0002] Cold-rolled hot-dip galvanized steel sheet, direct hot-dip galvanizing after continuous annealing has the advantages of continuous production, high production efficiency, uniform mechanical properties in the length and width directions of the strip, and good shape. Surface galvanizing can well protect the surface of the steel plate and has good corrosion resistance. [0003] In recent years, the demand for global construction and container industries has been increasing, and the competition has become increasingly fierce. The requirements for mechanical properties and formability of high-strength hot-dip galvanized products have been significantly improved, and the requirem...
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IPC IPC(8): C22C38/04C22C38/02C21D8/02C23C2/06C23C2/40
CPCC22C38/04C22C38/02C21D8/0205C21D8/0226C21D8/0236C21D8/0273C23C2/06C23C2/40C21D2211/005C21D2211/009C21D2211/003
Inventor 丁志龙魏宝民闫秉昊
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD