Q355GNH weathering steel plate is made of ordinary carbon steel by adding a small amount of copper, nickel, chromium and other corrosion-resistant elements during smelting, so as to improve the weathering resistance of Q355GNH weathering steel plate. Q355GNH weathering steel plate is not stainless steel, and it will also rust after contacting with the atmosphere. However, the corrosion of Q355GNH weathering steel plate is a dense amorphous rust layer structure, which will be firmly attached to the body surface to avoid further corrosion with the atmosphere.
Q355GNH weathering steel plate can be coated, bare or stabilized when it is used. The requirements for coating are the same as that for ordinary carbon steel. In particular, this material can be used without painting, which is the outstanding advantage of Q355GNH weathering steel plate. In areas without serious air pollution or special humidity, Q355GNH weathering steel plate can be exposed to the atmosphere directly without coating. Generally, after years, the rust layer is gradually stable, corrosion is no longer developed, and the appearance is beautiful chocolate color.
This kind of Q355GNH weathering steel plate has no paint aging and other problems, so it does not need painting maintenance, which greatly reduces the maintenance cost, and also avoids the loss caused by the influence of painting on the use.
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