Low Δr value micro-carbon steel hot-dip galvanized steel sheet and preparation method thereof
A hot-dip galvanized steel sheet and hot-dip galvanizing technology, applied in the field of metallurgy, can solve the problems of high cost, large △r value of hot-dip galvanized steel sheet, complex production process, etc., and achieve low energy consumption production, low cost, and simple preparation process Effect
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[0016] The invention provides a method for preparing a low-Δr value micro-carbon steel hot-dip galvanized steel sheet, comprising the following steps:
[0017] (1) Smelting process: according to the chemical composition of the micro-carbon steel, it is smelted into a slab; the thickness of the slab is 200mm;
[0018] (2) Hot rolling process: heat the cast slab to 1110°C-1150°C, and carry out rough rolling after 200-260 minutes of furnace time. The rough rolling adopts 5-pass rolling, the entire length of the phosphorus is removed, and the rolling process is put into heat preservation Cover, the thickness of the middle slab after rough rolling is 39mm~43mm; after rough rolling, finish rolling, the start rolling temperature of finish rolling is 900°C~930°C, the temperature of finish rolling is 740°C~760°C, and naturally cool to 560~600°C after finish rolling Carry out coiling to obtain hot-rolled coils, and the thickness of the steel plate is 3.5mm at this time;
[0019] (3) Pi...
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[0037]The present invention will be further explained and illustrated by the following examples and comparative examples.
[0038] The following examples and comparative examples are all smelted into billets by the chemical composition of Table 1; billet thickness is 200mm;
[0039] The billet is heated and rough rolled after 240 minutes of furnace time. The rough rolling adopts 5-pass rolling, and the phosphorus is completely removed in the whole length. The rolling process uses a heat preservation cover, and the thickness of the middle slab after rough rolling is 42.0mm;
[0040] After the rough rolling, the slab is subjected to finish rolling, and after the finish rolling, it is cooled naturally to obtain a hot-rolled coil, and the thickness of the obtained steel plate is 3.5mm;
[0041] After pickling the hot-rolled coils, they are cold-rolled into thin steel strips, and the cold-rolling reduction ratio is 80.0%;
[0042] Finally, the micro-carbon steel hot-dip galvanized...
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Abstract
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