3 common Quality Issues Of Hot-Dip Galvanized Steel Coils
Apr 19, 2024
3 common quality problems of hot-dip galvanized steel coils
1, Hot-Dip Galvanized Steel Coils rust.
There are two types of Hot-Dip Galvanized Steel Coilsrust, one is white rust.and another kind is Hot-Dip Galvanized Steel Coils red rust.
·White rust occurs when water vapor or water vapor caused by other reasons enters the inside of the steel coil or the gaps in the steel plate when the zinc layer on the surface of the galvanized steel plate is not damaged, causing white rust.
·Red rust means that the zinc layer on the surface of the steel plate has been destroyed, and then the rust directly enters the base plate of the galvanized steel plate, that is, the cold-rolled plate has rusted.
2, Hot-Dip Galvanized Steel Coils rub the dark spots.
Hot-Dip Galvanized Steel Coils rub the dark spots
Friction black spots usually occur after the steel coil is flattened, that is, after being transported for a long time after being turned into a galvanized steel sheet. Generally, strip-like black spots on the surface are caused by truck transportation. If there are friction black spots that are taken for inspection, there is a high probability that the surface passivation film no longer exists, that is, the surface passivation film was rubbed off during transportation.
In order to avoid rubbing the dark spots, one is when packing
The steel belts must be tightened horizontally and vertically, and the steel belts must be tightened, and the driver must start slowly and brake slowly.
3.Hot-Dip Galvanized Steel Coils Missing coating of zinc layer.
This is a problem with the original roll of the steel mill. If it appears at even intervals, it may be a problem with the rollers. There are also some common problems with other steel coils, such as internal stress in the wave edge, difference in the same plate, diagonal lines, sickle bends, etc.
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