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Definition and composition of S355J0WP steel

S355J0WP steel is a kind of structural steel with special weatherability and high corrosion resistance. Its definition and components are as follows:

1. Definition: S355J0WP steel is a kind of weathering steel specified in the European standard EN 10025-5, which belongs to a kind of non-alloy structural steel.

2. Composition: The chemical composition of S355J0WP steel includes the following elements:
- Carbon (C) : not more than 0.12%
Silicon (Si) : not more than 0.75%
- Manganese (Mn) : not more than 1.0%
- Phosphorus (P) : not more than 0.06%
- Sulfur (S) : not more than 0.035%
- Copper (Cu) : 0.25-0.55% (can improve atmospheric corrosion resistance)
Nickel (Ni) : ≤0.65% (can improve strength and weather resistance)
- Chromium (Cr) : 0.30-1.25% (can improve atmospheric corrosion resistance)
Molybdenum (Mo) : ≤0.15% (can improve strength and weather resistance)

The special composition of S355J0WP steel contains elements such as copper, nickel, chromium, which help to form a dense oxide layer that provides additional weather resistance and corrosion resistance. This steel is often used in outdoor buildings, Bridges and other structures that require weather resistance.