Preparation method of hot-dip-galvanizing steel coil
A technology of hot-dip galvanizing and steel coils, which is applied in heat treatment equipment, hot-dip coating process, heat treatment furnaces, etc., can solve the problems of hot-dip galvanized steel coils such as plasticity and toughness defects in mechanical properties, achieve good gloss and reduce environmental pollution. Pollution and treatment cost reduction effects
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Embodiment 1
[0039] Embodiment 1: a kind of preparation method of hot-dip galvanized steel coil, comprises the steps:
[0040] S1, the cold-rolled hard steel coil (the thickness of the cold-rolled hard steel coil is 0.8mm, and its chemical composition and physical properties are shown in Table 1) is fed, removed, uncoiled, head-cut and tail-cut, welded, The welding speed is 5-12m / min, and the welding time is 30-50s;
[0041] S2, degreasing the cold-rolled hard steel coil after S1 treatment, and drying it with hot air for the first time. The degreasing treatment includes chemical degreasing, brush roller scrubbing, subsequent degreasing, electrolytic cleaning, and hot water rinsing. The degreasing temperature in chemical degreasing is 55-60°C, the concentration of degreasing solution is 10-15%; the temperature in subsequent degreasing is 50-54°C, and the concentration of degreasing solution is 8-12%; the temperature of electrolytic cleaning is 55-60°C, and the concentration of electrolyte i...
Embodiment 2
[0050] Example 2: A method for preparing hot-dip galvanized steel coils. The difference from Example 1 is that the thickness of the cold-rolled hard steel coils is 0.6mm, the temperature in the first annealing zone is 720°C, and the temperature in the second annealing zone is The temperature in the third annealing area is 790 °C, and the temperature in the fourth annealing area is 780 °C. The degreased cold-rolled hard steel coil passes through the first annealing area, the second annealing area, the third annealing area and the fourth annealing area The time is 1:1:2:2; the zinc liquid used in the galvanizing treatment includes 1.1wt% aluminum, and the balance is pure zinc; the temperature of the curing treatment is 180°C. The chemical composition and physical properties of cold-rolled hard steel coils are shown in Table 2.
[0051] Table 2 Chemical composition and physical properties of cold-rolled hard steel coils
[0052]
Embodiment 3
[0053] Embodiment 3: A method for preparing a hot-dip galvanized steel coil. The difference from Embodiment 1 is that the temperature in the first annealing zone is 730°C, the temperature in the second annealing zone is 810°C, and the temperature in the third annealing zone is 800°C, the temperature in the fourth annealing zone is 800°C, the time for the degreased cold-rolled hard steel coil to pass through the first annealing zone, the second annealing zone, the third annealing zone and the fourth annealing zone is 1:2:3:2; The zinc liquid used in the galvanizing treatment includes 1.0wt% aluminum, and the balance is pure zinc; the curing treatment temperature is 220°C. The chemical composition and physical properties of cold-rolled hard steel coils are shown in Table 3.
[0054] Table 3 Chemical composition and physical properties of cold-rolled hard steel coils
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