S355N: European standard structural steel S355N: European standard structural steel Executive Standard: EN10025 Delivery status: normalizing chemical composition: C: 0.20; Si: 0.50; Mn: 1.65; P: 0.030; S:. 0.025 Uses: mainly used large ships, bridges, power station equipment, medium and high pressure boilers, pressure vessels, locomotives, cranes, mining machinery and other large welded structures Sales Tel:. S355N: European standard structural steel Executive Standard: EN10025 Delivery Status: Positive Fire chemical composition: C: ≤0.20; Si: ≤0.50; Mn: ≤1.65; P: ≤0.030; S:. ≤0.025 Uses: mainly used for large ships, bridges, power station equipment, medium and high pressure boilers, pressure vessels, rolling stock, lifting machinery, mining machinery and other large welded structures.