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S355JR UB 406x178x74 Hot Rolled Structural H Beam
Material characteristics of S355JR steel h beam
Chemical composition
Carbon (C) ≤ 0.22%, Silicon (Si) ≤ 0.55%, Manganese (Mn) ≤ 1.60%, Phosphorus (P) ≤ 0.025%, Sulfur (S) ≤ 0.025%.
The toughness and welding performance of the steel are ensured by strictly controlling the content of harmful elements (such as P, S).
Mechanical properties
Yield strength: ≥ 355MPa (when thickness ≤ 16mm).
Tensile strength: 470-630MPa.
Elongation: ≥ 22% (thickness 3-40mm).
Impact toughness: Longitudinal impact energy ≥ 27J at +20℃.
Equivalent standard: equivalent to national standard Q355B, delivery status is normalized (+N)
UB 406x178x74 H-section steel specifications (UB 406x178x74)
Cross-sectional dimensions
Height: 412.8mm, width: 179.5mm, web thickness: 9.5mm, flange thickness: 16mm.
Weight per meter: 74.2kg.
Implementation standard: European standard EN10034:1993, strict tolerance, suitable for high-precision engineering needs.
Production process and quality control of S355JR UB 406x178x74 h section steel
Smelting and rolling: smelting by electric furnace or converter, hot rolling forming, some need normalizing treatment to refine grains and improve performance; the surface is polished and rust-removed to enhance corrosion resistance.
Precision processing: advanced equipment is used to ensure that the dimensional tolerance meets the EN10034 standard and meets the high-precision requirements of bridges, buildings and other projects.
Application scenarios of S355JR UB 406x178x74 h shaped steel
Road and bridge engineering: widely used in bridge main beams, bridge piers, and highway support structures. Its high strength and toughness can withstand dynamic loads.
Typical cases: main structures of large bridges, highway overpasses.
Construction field: high-rise frames, industrial plants.
Shipbuilding: hull structures, decks.
Machinery manufacturing: used for load-bearing parts such as mechanical equipment housings and brackets.
