Q355NH weathering steel plate is characterized by uniform rust red color, good color fastness and adhesion, no peeling, no slag falling, no rust water flowing in the later stage, and super corrosion resistance.
The false Q355NH weathering steel plate is black, that is, ordinary weathering steel or ordinary steel. The mechanical properties of the steel are poor, the early corrosion is serious, peeling, slag falling, rust, hot metal flowing all over the ground, polluting the environment, short service life and serious corrosion.
Q355NH weathering steel plate generally needs 1-2 years to naturally rust, 2-3 months only slight yellow rust, easy to rust.
When welding Q355NH weathering steel plate with high phosphorus content, special preventive measures should be taken to make the rust prevention process of Q355NH weathering steel plate quickly form stable oxide film of Q355NH weathering steel plate, with uniform color and thickness and not easy to wear off.
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