Cold rolling galvanized steel sheet with yield strength being 280 MPa and manufacturing method thereof
A technology of hot-dip galvanized steel sheet and yield strength, which is applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of high manufacturing cost, achieve low manufacturing cost, reduce cold and brittle transition temperature, and improve product quality. The effect of intensity
Inactive Publication Date: 2019-12-31
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology
[0007] The purpose of the present invention is to provide a 280MPa grade cold-rolled hot-dip galvanized steel sheet and its manufacturing method, which mainly solves the technical problem of high manufacturing cost of 280MPa-grade cold-rolled hot-dip galvanized steel sheet in the prior art
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[0045] Below in conjunction with embodiment 1-4, the present invention is further described, as shown in table 1-4, table 1 is the chemical composition (by weight percentage) of the substrate of hot-dip galvanized steel sheet of the embodiment of the present invention, all the other are Fe and unavoidable Impurities.
[0046] Table 1 The chemical composition of the substrate of the hot-dip galvanized steel sheet according to the embodiment of the present invention, unit: weight percent.
[0047]
[0048] According to the requirements of the material composition design of the present invention, the molten steel meeting the required chemical composition is obtained by adopting converter melting, the molten steel is vacuum decarburized and degassed in the RH furnace, the pure degassing time of the molten steel in the RH furnace is greater than 8 minutes, and the molten steel is blown by Ar The continuous casting slab is obtained by the protective continuous casting, the thickn...
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Abstract
The invention discloses a cold rolling galvanized steel sheet with the yield strength being 280 MPa and a manufacturing method thereof. The technical problem that in the prior art, a cold rolling galvanized steel sheet with the yield strength being 280 MPa is high in manufacturing cost is mainly solved. According to the cold rolling galvanized steel sheet with the yield strength being 280 MPa, a substrate of the steel sheet is prepared from, by weight, 0.0045-0.0085% of C, not larger than 0.050% of Si, 0.25-0.50% of Mn, 0.025-0.045% of P, not larger than 0.018% of S, 0.050-0.090% of Ti, 0.0003-0.0010% of B, not larger than 0.005% of N, 0.015-0.060% of Al, the balance Fe and inevitable impurities. The percentage elongation after fracture A80 mm of the 0.35-0.80 mm thick galvanized steel sheet is 32-38%, and the galvanized steel sheet is mainly used for the household appliance industry.
Description
technical field [0001] The present invention relates to a cold-rolled hot-dip galvanized steel sheet, in particular to a cold-rolled hot-dip galvanized steel sheet with a yield strength of 280 MPa and a manufacturing method thereof, in particular to a hot-dip galvanized interstitial-free steel sheet with a yield strength of 280-320 MPa The invention and a manufacturing method thereof belong to the technical field of iron-based alloys. Background technique [0002] Interstitial atom-free steel (IF steel), because the interstitial atoms in the steel are fixed by titanium or niobium to form carbon and nitride, so this type of steel has no aging phenomenon. IF steel cold-rolled and annealed products do not show a yield plateau after color coating and baking. Therefore, compared with ordinary carbon steel, IF steel can better meet the requirements of curved surfaces without bending. However, the traditional IF steel has low strength, and the yield strength is generally below 200...
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IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06C22C38/14C23C2/06C23C2/40
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0273C21D2211/005C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14C23C2/06C23C2/40
Inventor 王进
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD