Why are there bubbles on the surface of weathering steel?

1. The temperature of the extrusion cylinder and the extrusion ingot is too high.

2. The temperature and size of the steel ingot exceed the allowable negative deviation range.

3. The ingot is too long, the filling is too fast, and the temperature of the ingot is uneven, resulting in no drum filling, incomplete cylinder exhaust, or improper operation, and the exhaust is not performed.

4. Under normal circumstances, the appearance of the steel plate with good weather resistance does not need to be oiled after cleaning. The internal and external appearance quality of Q345NH high-quality steel, alloy thin steel plate, thin-walled pipe, alloy steel pipe, etc. is better. After storage, it should be coated with anti-rust oil.

5. Steel bars with corrosion data such as acid, alkali, salt and cement shall not be stacked in the warehouse. Various steel grades should be stacked separately to prevent mixing and contact with corrosion.

6. Severe corrosion-resistant steel plates should not be temporarily stored after rust removal, but should be used as soon as possible.