Galvanizing refers to a rust-proof method of laying metallic zinc on the surface of iron or steel. Zinc is a metal with high corrosion resistance. It can insulate iron from oxygen and water, so that iron cannot undergo the chemical reactions required for rusting. Because zinc is more mobile than iron, even if the zinc plated appears Even if damaged, zinc can still prevent rust by electrochemical means of sacrificial protection. The main galvanizing methods include hot dip galvanizing (HDG), electro galvanizing (EG) and cold galvanizing.
Galvanizing methods include hot-dip galvanizing, hot-spray galvanizing, electro-galvanizing, cold galvanizing, powder hot-dip galvanizing, mechanical galvanizing and vacuum evaporation galvanizing, etc.
Product tags
| Product Name | Galvanized Steel Coil | |
|---|---|---|
| Standard: | AISI, ASTM, BS, DIN, GB, JIS | |
| Zinc coated: | 30g/m2-275g/m2 | |
| Spangle | Zero spangles, Small spangles, Regular spangles, Big spangles | |
| Surface treatment | Chromated, oiled/non-oiled and anti-finger printing | |
| Thickness | 0.12-2.0mm | |
| Coil Weight | 3 – 5 tons (can be customized) | |
| Certificates | SGS, BV, ISO 9001 |
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1. Stainless steel crude steel smelting process
At present, the smelting processes for producing stainless steel in the world are mainly divided into one-step, two-step and three-step methods, as well as new integrated production methods. The one-step smelting method is: molten iron + AOD (argon oxygen refining furnace); the two-step method is: EAF (electric arc furnace) + AOD (argon oxygen refining furnace). The three-step method is: EAF (electric arc furnace) + AOD (argon oxygen refining furnace) + VOD (vacuum refining furnace). In addition to several traditional production processes, the current integrated production process, that is, the production process from molten iron directly to stainless steel, is also adopted by many companies. The production process is: RKEF (rotary kiln electric furnace) + AOD (argon oxygen refining furnace).
2. Stainless steel hot rolling process
The stainless steel hot rolling process uses slabs (mainly continuous casting billets) as raw materials, and after heating, the rough rolling unit and the finishing rolling unit make strip steel. The hot steel strip coming out of the last rolling mill of finishing rolling is cooled to the set temperature by laminar flow, and is rolled into steel coils by the coiler. The surface of the cooled steel coils has oxide scale and appears black, commonly known as “stainless steel black coils” . After annealing and pickling, the oxidized surface is removed, which is called “stainless steel white roll”. Most of the hot-rolled products circulating in the stainless steel market are stainless steel white rolls.
3. Stainless steel cold rolling process
After hot rolling of stainless steel, some hot-rolled stainless steel products are directly used downstream, and some hot-rolled products need to be processed into cold rolling before use.
For stainless steel cold rolling, stainless steel hot-rolled products with a thickness of 3.0-5.5mm are mostly used. After rolling processing by cold rolling equipment, stainless steel cold-rolled products are produced. Currently, there are two main production processes for stainless steel cold rolling: stainless steel single-stand cold rolling and stainless steel multi-stand cold rolling.
4.Annealing and pickling unit
After stainless steel is cold rolled, it needs to go through annealing and pickling units. The annealing of stainless steel after cold rolling is to eliminate work hardening through the recrystallization process to achieve the purpose of softening; the purpose of pickling is to remove the oxide layer formed on the surface of the steel strip during the annealing process, and to passivate the surface of the stainless steel. , improve the corrosion resistance of steel plates.
