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The chemical composition of S355J2WP steel mainly includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr), nickel (Ni) and copper (Cu). The specific ingredient content is as follows:

Carbon (C): The maximum content is usually 0.20%. Carbon is one of the main alloying elements of steel, affecting the strength and hardness of steel.
Silicon (Si): The content is usually between 0.17~0.37%. Silicon can improve the strength and hardness of steel and help deoxidize.
Manganese (Mn): The content is usually between 1.00~1.60%. Manganese is an important alloying element in steel, which helps to improve the strength and toughness of steel.
Phosphorus (P): The maximum content is usually controlled below 0.035%. Phosphorus has a positive impact on the strength and toughness of steel, but excessive phosphorus content may reduce the weldability of steel.
Sulfur (S): The maximum content is usually controlled below 0.035%. Sulfur has an adverse effect on the weldability of steel, so its content needs to be controlled.
Chromium (Cr): The content is usually between 0.40~0.80%. Chromium is an important element of weathering steel and helps to improve the corrosion resistance of steel.
Nickel (Ni): The content may vary according to specific production standards. Nickel can improve the corrosion resistance and toughness of steel.
Copper (Cu): The content is usually between 0.25~0.55%. Copper has a positive impact on the corrosion resistance of steel, especially in terms of resistance to atmospheric corrosion.

The characteristics of S355J2WP steel are mainly reflected in the following aspects:

Excellent weather resistance: S355J2WP steel has the ability to resist the erosion of the natural environment, including wet, cold, dry and other conditions, which allows it to remain stable for a long time in outdoor environments, bridges, buildings and other fields, reducing the cost of maintenance and repair.
Good corrosion resistance: This alloy steel can effectively resist corrosion in the atmosphere and chemical substances, thereby extending its service life. S355J2WP can show good corrosion resistance in various corrosive environments, such as acids, alkalis, salts and other chemical substances as well as corrosive media in the atmosphere and soil.
Higher fire resistance: S355J2WP steel is able to withstand extreme conditions such as high temperatures and fires, which gives it an advantage in specific engineering environments.
High strength and toughness: S355J2WP steel has high strength and can withstand large forces and pressures. At the same time, its good toughness can maintain the integrity of the structure when it is impacted and extruded, ensuring the stability of the structure.
Good processing performance: S355J2WP steel is easy to process and weld, and can be adjusted in shape and size as needed to meet various processing and production needs.
In general, S355J2WP steel is widely used in construction, bridges, ships and other fields due to its excellent weather resistance, corrosion resistance, fire resistance, as well as high strength and toughness. These characteristics enable the structure to withstand the erosion of the external environment and the challenges of external forces, improving the quality and reliability of the product.

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