Method for producing color-coated plate for structure with yield strength of more than or equal to 550 MPa
A technology of yield strength and production method, applied in the direction of coating, metal material coating process, hot-dip galvanizing process, etc., can solve the problem of reducing the adhesion of galvanized layer, improving the production cost of color-coated plates for structural use, and the yield strength cannot be reached Waiting for the question
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Embodiment 1
[0020] The production method of the structural color-coated plate with yield strength ≥ 550MPa, the thickness of the steel plate is 0.6mm, the steps:
[0021] 1) Smelting: hot metal desulfurization, converter smelting, continuous casting to form components and weight percentages: C: 0.05%, Si: 0.013%, Mn: 0.25%, P: 0.015%, S: 0.012%, Als: 0.05% , N: 0.0021%, Ti: 0.002%, Nb: 0.001%, the rest is continuous casting of Fe and unavoidable impurities and hot rolling;
[0022] 2) pickling;
[0023] 3) Carry out cold rolling, and control the cumulative reduction rate at 65%;
[0024] 4) Carry out continuous annealing, the annealing temperature is controlled at 600 ° C ~ 605 ° C, and the annealing time is 60 seconds; after annealing, the metallographic structure is ferrite + deformed band crystal;
[0025] 5) Perform hot-dip galvanizing, and control the weight of the double-sided hot-dip galvanized metal layer to 150g / m 2 , the composition and weight percentage of the coating are: A...
Embodiment 2
[0029] The production method of the structural color-coated plate with yield strength ≥ 550MPa, the thickness of the steel plate is 0.8 mm, the steps:
[0030] 1) Smelting: Desulfurization of molten iron, converter smelting, and continuous casting to form components and weight percentages: C: 0.04%, Si: 0.011%, Mn: 0.20%, P: 0.02%, S: 0.011%, Als: 0.06% , N: 0.0015%, Ti: 0.003%, Nb: 0.002%, the rest is continuous casting slab of Fe and unavoidable impurities and hot rolling;
[0031] 2) pickling;
[0032] 3) Carry out cold rolling, and control the cumulative reduction rate at 61%;
[0033] 4) Carry out continuous annealing, the annealing temperature is controlled at 615 ° C ~ 620 ° C, and the annealing time is 50 seconds; after annealing, the metallographic structure is ferrite + deformed band crystal;
[0034] 5) Perform hot-dip galvanizing, and control the weight of the double-sided hot-dip galvanized metal layer to 120g / m 2 , the composition and weight percentage of the ...
Embodiment 3
[0038] The production method of the structural color-coated plate with yield strength ≥ 550MPa, the thickness of the steel plate is 1.0 mm, the steps:
[0039]1) Smelting: hot metal desulfurization, converter smelting, continuous casting to form components and weight percentages: C: 0.03%, Si: 0.020%, Mn: 0.18%, P: 0.01%, S: 0.009%, Als: 0.02% , N: 0.0025%, Ti: 0.001%, Nb: <0.001%, and the rest are continuous casting slabs of Fe and unavoidable impurities and hot rolling;
[0040] 2) pickling;
[0041] 3) Carry out cold rolling, and control the cumulative reduction rate at 58%;
[0042] 4) Carry out continuous annealing, the annealing temperature is controlled at 645 ° C ~ 650 ° C, and the annealing time is 20 seconds; after annealing, the metallographic structure is ferrite + deformed band crystal;
[0043] 5) Perform hot-dip galvanizing, and control the weight of the double-sided hot-dip galvanized metal layer to 60g / m 2 , the composition and weight percentage of the coat...
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