EN10025-5 S355J2WP weathering steel plate is designed with low carbon composition. The high carbon content is unfavorable to the impact toughness of steel, especially the impact energy of EN10025-5 S355J2WP weathering steel plate, and obviously damages the welding performance. Considering the difficulty of control of EN10025-5 S355J2WP weathering steel plate, the carbon content should not be too low, so the content is limited to 0.04-0.10%.
Silicon is a deoxidizing element in the process of making EN10025-5 S355J2WP weathering steel plate, and a proper amount of silicon can inhibit the segregation of manganese and phosphorus, and improve the strength of EN10025-5 S355J2WP weathering steel plate through solid solution strengthening. However, too high silicon content will deteriorate the weldability and low temperature toughness of EN10025-5 S355J2WP weathering steel plate, so its content is limited to 0.18-0.35%.
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