What is the difference between weathering steel used in shipping container and ordinary steel?
What is the difference between weathering steel used in shipping containers and ordinary steel?
Weathering steel (also known as weathering steel) refers to a low-alloy high-strength steel that has good corrosion resistance in the atmosphere by adding a small amount of alloying elements. The atmospheric corrosion resistance of weathering steel is 2-8 times that of ordinary carbon steel, and the longer the service time, the more prominent the corrosion resistance. In addition to good weather resistance, weathering steel also has excellent mechanics and welding properties, and is widely used in railway vehicles, bridges and containers. Weathering steel is not stainless steel, it will rust like ordinary carbon steel in the early stage, but the situation is different in the later stage. After the weathering steel is corroded for a period of time, due to the enrichment of trace elements such as Cu and P on the steel surface, a dense amorphous rust layer structure is formed, which is very firmly combined with the matrix. This stabilized rust layer can resist the intrusion of moisture and harmful ions in the atmosphere to a certain extent, and prevent further corrosion of the base metal.