Weatherability of S355M weathering steel

S355M weathering steel has excellent weather resistance, mainly in the following aspects:

1. Forming an oxide layer: When S355M weathering steel is exposed to the atmospheric environment, its surface will gradually form a dense oxide layer, called weather-resistant skin or oxide skin. This oxide layer is formed on the surface of steel rich in alloying elements such as copper, chromium, nickel and phosphorus, which prevents further corrosion.

2. Self-healing: The oxide layer of S355M weathering steel has self-healing properties, that is, when the oxide layer is damaged, it can repair and regenerate by itself. This self-healing property enables the steel to maintain good weather resistance when exposed to harsh environments for a long time.

3. Corrosion resistance: The oxide layer of S355M weathering steel has good corrosion resistance and can effectively resist the erosion of corrosive media such as humidity, salt spray and acid in the atmosphere. This gives the steel excellent durability in harsh conditions such as Marine environments, industrial pollution areas and high humidity areas.

4. Wear resistance: The oxide layer of S355M weathering steel can provide a certain degree of wear resistance, so that it can maintain good surface quality and performance when subjected to mechanical effects such as friction, abrasion and slight impact.

In summary, S355M weathering steel shows excellent weather resistance by forming a dense oxide layer and having self-healing properties. This characteristic makes it ideal for resisting corrosion and oxidation in atmospheric environments, and is widely used in various structural engineering projects that require long-term exposure to harsh environments.