The European standard S355J2 H-beam HEM120 (dimensions 140×126×12.5×21) is a heavy-duty wide-flange model in the HEM series of EN 10365 H-beams.
S355J2 specified under EN 10025 is a high-strength low-alloy structural steel that combines high strength with excellent low-temperature toughness, so the HEM120 S355J2 H Beam is a core choice for heavily loaded structures in confined spaces.
Chemical Composition of S355J2 Steel (EN 10025)
| Element | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Nb (%) | V (%) | Ti (%) |
|---|---|---|---|---|---|---|---|---|
| Content | ≤0.20 | ≤0.55 | 1.60 | ≤0.025 | ≤0.025 | ≤0.05 | ≤0.12 | ≤0.05 |
The table reflects typical limits for S355J2, suitable for structural applications including HEM beams.
Physical Properties of S355J2 Steel (EN 10025)
| Property | Value |
|---|---|
| Yield Strength (ReH) | ≥355 MPa |
| Tensile Strength (Rm) | 470–630 MPa |
| Elongation (A) | ≥20% |
| Impact Energy (J) | 27 J at –20°C |
| Density | 7.85 g/cm³ |
| Modulus of Elasticity | 210 GPa |
| Poisson's Ratio | 0.3 |
German industrial plant heavy equipment support project
In a renovation project of an industrial factory in Germany, S355J2 HEM120 H-section steel was used as the support framework for the base of large machinery, including machine tools and crushers.
The thick flange design of S355J2 HEM120 allows direct welding of anchor bolts without additional reinforcement, ensuring the long-term stability and safety of the equipment.
A total of 28 S355J2 HEM120 beams, weighing approximately 560 tons, were used in the project. During construction, precise beam layout and high-strength welding enabled rapid assembly of the support bases, ensuring stable installation of the heavy machinery while significantly enhancing the load-bearing capacity and construction efficiency of the factory structure.
S355J2 HEM120 H-Beam Fabrication and Procurement Guidelines
Welding Process: The thick flange of HEM120 (21 mm) is considered a thick-plate weld. It is recommended to use low-hydrogen electrodes and strictly control the interpass temperature ≤ 250°C. After welding, post-weld hydrogen removal should be performed to ensure weld quality and structural performance.
Quality Inspection and Material Certification: We can provide the S355J2 Material Test Certificate (MTC), which includes verification of key mechanical properties such as impact energy.
For thick-walled H-beams, it is recommended to perform ultrasonic testing (UT) to ensure the absence of internal defects, enhancing construction safety and structural reliability.
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What is structural steel S355J2?
S355J2 is a medium tensile, low carbon manganese steel which is readily weldable and possess good impact resistance (also in sub-zero temperatures). This material is commonly supplied in the untreated or normalized condition. Machinability of this material is similar to that of mild steel.
What is steel S355J2 equivalent to?
The ASTM equivalent of S355J2 is A572 Grade 50, with similar high strength and low-temperature toughness for structural use. Gangsteel's high-quality plates ensure compliance for your projects. For more, explore our BS EN 10025-2 material grade guide.
Is S355J2 mild steel?
Enhanced Strength: With a minimum yield strength of 355 MPa, S355-J2 MS Beams are among the strongest in the mild steel category, providing robust support and stability for heavy-load bearing structures.
What is the tensile strength of S355J2?
S355J2 has a tensile strength of 470 to 630 MPa and minimum yield strength of 355 N/mm2.