How to distinguish and choose weathering steel?

Selection and differentiation of weathering board

The characteristics of weather-resistant board: uniform rust red, good color fastness, no peeling, no slag, no rust water flowing in the later stage, and strong corrosion resistance.
Rusty steel plate: The color is black, that is, ordinary weathering board or ordinary steel, poor mechanical properties of steel, severe early corrosion, peeling, slagging, rusty molten iron overflowing the environment, ultra-short service life, and serious corrosion.

Selection and differentiation of weathering board
1. At the stage when the weathering board is not rusty, the naked eye cannot distinguish between the normal weathering board and the ordinary hot-rolled weathered board. It is necessary to refer to the quality assurance letter of the steel plant. The quality assurance letter requires the supplier to provide the original red seal of the steel plant as far as possible.

2. In the initial stage of long rust of weathering board (1-3 months outdoors), the weathered steel began to grow small rust spots. The rust spots of ordinary weathered boards are relatively loose, and weathering boards have poor rust prevention effects and even appear rust. skin.

3. The second stage of weathering board (outdoor 4-8 months) has less long rust, thicker rust spots of weathering steel, thinner rust water and rust spots of ordinary weathering board, and more serious rust pillars and tear marks of ordinary weathering board. There are black marks on the bottom of the workpiece.

4. The third stage of long-rust weathering board (more than 8 months outdoors), normal weathered steel has a clear and dense rust core layer, the rust points are tightly adhered in the protective layer, and the hands are almost not rusted; ordinary weathered boards are more rusty, even The entire rust peeled off and the rust passed by. Ordinary weathering steel tends to be reddish brown, and ordinary weathering board tends to black.

To ensure the effect of weathering board, it is necessary to make a reasonable selection and distinguish the authenticity reasonably, so that the use is more at ease. Because weathering board is different from other steel plates, please choose and distinguish carefully.