What are the differences between S355J2W steel plate and S355J2WP steel plate?

The composition and properties of S355J2W steel plate are different from that of S355J2WP steel plate. Meaning of S355J2W steel plate: s is structural steel, 355 is yield strength 355MPa, and J2 is required to be - 20℃. The letter W indicates that the steel is resistant to atmospheric corrosion.

Meaning of S355J2WP steel plat: S355J2WP steel platis a high phosphorus corrosion resistant structural steel. S is structural steel, 355 is yield strength 355MPa, J2 is required - 20℃. The letter W indicates that the steel is resistant to atmospheric corrosion, and P is the chemical element phosphorus.

S355J2W steel plate is widely used in high-speed railway bogie, welding, bolting and riveting parts. S355J2W steel plate enhances the ability of atmospheric corrosion resistance applied at ambient temperature. In order to achieve corrosion resistance, some specific alloy elements, such as P, Cu, Cr, Ni and Mo, are added to form a protective oxide layer on the metal surface under various climatic conditions.