Low-cost high-strength prepainted steel sheet and manufacture method thereof
A manufacturing method and technology of color-coated boards, which are applied in the field of steel manufacturing, can solve problems affecting color-coating operations and the service life of color-coated boards, reduce the adhesion of color-coated pretreatment conversion layers, and complex chemical components of substrates, etc. The effect of increasing the speed of galvanizing line, reducing the annealing temperature of hot-dip galvanizing and improving market competitiveness
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Embodiment 1
[0029] Example 1: The chemical composition (wt%) of low carbon aluminum killed steel is C: 0.095, Si: 0.011, Mn: 0.52, P: 0.019, S: 0.009, solAl: 0.046, N: 0.0014, Cr: 0.013, Cu : 0.038, Ni: 0.009, and the rest are Fe and unavoidable impurities. Hot metal steelmaking→continuous casting→hot rolling→pickling→cold rolling→hot galvanizing→alloying→finishing→color coating, among which, the cumulative reduction rate of cold rolling is 68%, and five passes are carried out with five stands The cold rolling, hot-dip galvanizing annealing temperature is controlled at 730°C, the speed of the hot-dip galvanizing unit is 110m / min, and the weight of the zinc-iron alloy coating is 175g / m 2(Double-sided), the alloying temperature of the galvanized coating is 535°C, the iron content of the alloy layer is 9.5%, and the roughness Ra after skin pass is controlled at 0.60 μm, producing a low-cost high-strength color-coated plate with a thickness of 0.8mm. The yield strength R P0.2 (or R eH ) is...
Embodiment 2
[0030] Example 2: The chemical composition (wt%) of low carbon aluminum killed steel is C: 0.079, Si: 0.017, Mn: 0.52, P: 0.021, S: 0.007, solAl: 0.041, N: 0.0015, Cr: 0.012, Cu : 0.037, Ni: 0.008, and the rest are Fe and unavoidable impurities. Hot metal steelmaking→continuous casting→hot rolling→pickling→cold rolling→hot galvanizing→alloying→skin finishing→color coating, among which, the cumulative reduction rate of cold rolling is 70%, and five passes are carried out with five stands The cold rolling, hot-dip galvanizing annealing temperature is controlled at 720°C, the speed of the hot-dip galvanizing unit is 100m / min, and the weight of the zinc-iron alloy coating is 150g / m 2 (Double-sided), the alloying temperature of the hot-dip galvanized coating is 545°C, the iron content of the alloy layer: 11%, and the roughness Ra after skin finishing is controlled at 0.35 μm, producing a low-cost high-strength color-coated plate with a thickness of 1.0mm. The yield strength R P0....
Embodiment 3
[0031] Example 3: The chemical composition (wt%) of low carbon aluminum killed steel is C: 0.083, Si: 0.015, Mn: 0.50, P: 0.017, S: 0.009, solAl: 0.034, N: 0.0016, Cr: 0.014, Cu : 0.038, Ni: 0.009, and the rest are Fe and unavoidable impurities. Hot metal steelmaking→continuous casting→hot rolling→pickling→cold rolling→hot galvanizing→alloying→finishing→color coating, among which, the cumulative reduction rate of cold rolling is 72%, and five passes are carried out with five stands The cold rolling, hot-dip galvanizing annealing temperature is controlled at 750°C, the speed of the hot-dip galvanizing unit is 115m / min, and the weight of the zinc-iron alloy coating is 110g / m 2 (Double-sided), the alloying temperature of the hot-dip galvanized coating is 525°C, the iron content of the alloy layer: 8.5%, and the roughness Ra after skin finishing is controlled at 0.45 μm, and a low-cost high-strength color-coated plate with a thickness of 0.6mm is produced. The 0.6mm thick low-cos...
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