S355J0 HEA beams and S355J2 HEA beams are low-temperature structural steel beams manufactured according to EN 10025-2. Both types are widely used in marine, offshore, and cold-environment constructions, offering excellent toughness and mechanical performance.
Key Difference: Impact Test Temperature
| Grade | Minimum Impact Test Temperature |
|---|---|
| S355J0 | 0°C |
| S355J2 | –20°C |
S355J0 HEA beams: Tested at 0°C, suitable for moderately low-temperature environments
S355J2 HEA beams: Tested at –20°C, suitable for harsh, cold environments such as deep ocean platforms
Available Sizes and Stock
Gnee maintains a large inventory of S355J0 and S355J2 HEA beams, including:
HEA 100, HEA 120, HEA 140, HEA 160, HEA 180, HEA 200, HEA 240, HEA 260, HEA 280, HEA 300, HEA 320, HEA 340, HEA 360, HEA 400, HEA 450, HEA 500, HEA 600, HEA 650, HEA 700
Certificates: EN 10204 3.1 or 3.2 TYPE mill test certificate
Export Markets: Malaysia, Indonesia, Thailand, Singapore
Chemical Composition Comparison (Max %)
| Standard | Grade | C | Mn | P | S | Si | Cu | N |
|---|---|---|---|---|---|---|---|---|
| EN 10025-2 | S355J0 | 0.20 | 1.60 | 0.030 | 0.030 | 0.55 | 0.55 | 0.012 |
| EN 10025-2 | S355J2 | 0.20 | 1.60 | 0.025 | 0.025 | 0.55 | 0.55 | – |
Note: S355J2 has slightly lower P and S content, enhancing low-temperature toughness.
Mechanical Properties Comparison
| Standard | Grade | Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) |
|---|---|---|---|---|
| EN 10025-2 | S355J0 | t ≤ 16 | 355 | 470–630 |
| EN 10025-2 | S355J2 | t ≤ 16 | 355 | 470–630 |
Both grades share identical yield and tensile strength, ensuring structural reliability. The main difference lies in service temperature suitability.
Applications of S355J0 / S355J2 HEA Beams
1. Offshore Platforms
Use Case: Structural beams for deep-sea platforms, oil rigs, and offshore wind turbine foundations.
Typical Beam Sizes: HEA 240 – HEA 700
Mechanical Requirements:
Designed to withstand dynamic wave and wind loads up to 50–80 kN/m²
Impact toughness: 27 J at 0°C (S355J0) / –20°C (S355J2)
Applications Detail:
Main girders and cross beams supporting heavy equipment and deck loads
Crane and hoist support beams for offshore operations
Structural frames designed for corrosion-resistant coatings in saltwater environments
2. Marine Structures
Use Case: Pier decks, docks, jetties, and other maritime constructions exposed to low-temperature conditions.
Typical Beam Sizes: HEA 160 – HEA 500
Mechanical Requirements:
Resistant to thermal contraction and expansion in cold-water climates
Able to carry uniform live loads of 4–10 kN/m², plus concentrated equipment loads
Applications Detail:
Pier deck beams supporting pedestrian and light vehicle traffic
Dockside crane rails and gantries requiring high toughness and fatigue resistance
Marine storage and operational platforms subjected to saltwater corrosion
3. Industrial Facilities
Use Case: Cold-storage warehouses, chemical plants, and industrial facilities operating at sub-zero temperatures.
Typical Beam Sizes: HEA 120 – HEA 500
Mechanical Requirements:
Beams maintain structural integrity at –20°C (S355J2)
Supports heavy equipment, racking systems, and mezzanine floors
Applications Detail:
Mezzanine and intermediate floors in refrigerated warehouses
Frameworks for conveyor systems, chemical reactors, or HVAC equipment
Structural beams for industrial sheds and processing plants in cold regions
4. General Construction
Use Case: Heavy-duty frameworks in buildings, bridges, and industrial structures where low-temperature impact resistance is critical.
Typical Beam Sizes: HEA 100 – HEA 700
Mechanical Requirements:
Yield strength: 355 MPa, tensile strength: 470–630 MPa
Suitable for axial loads up to 400–500 kN per beam depending on cross-section
Applications Detail:
Multi-storey building beams and columns in cold climates
Bridge girders and support structures for vehicular loads
Crane runway beams and structural supports requiring high ductility and toughness
S355J0 / S355J2 HEA beams are ideal for projects where low-temperature toughness, high load-bearing capacity, and structural reliability are critical.
The difference in impact test temperature (+0°C vs –20°C) ensures proper material selection according to environmental conditions, making these beams suitable for offshore, marine, industrial, and cold-region construction.
What is S355J0 steel and where is it used?
S355J0 is a widely used structural steel grade conforming to EN 10025-2. It offers a minimum yield strength of 355 MPa and combines good strength with excellent weldability. Its balanced mechanical properties make it suitable for construction frameworks, bridges, heavy machinery, and other structural applications where both strength and toughness are important.
What are the mechanical properties of S355J0?
S355J0 steel provides a minimum yield strength of 355 MPa and a tensile strength typically between 470–630 MPa, depending on thickness. It has good ductility, allowing structures to absorb energy under load without sudden failure. The "J0" designation indicates that the steel is tested for impact toughness at 0°C, ensuring safe performance in moderate temperature conditions.
How does S355J0 perform under welding?
Thanks to its low carbon content, S355J0 has excellent weldability. It can be welded using conventional processes such as SMAW, GMAW, or FCAW with minimal preheating in most applications. Proper control of welding heat input and sequence is recommended to prevent localized softening or residual stresses, especially for thicker plates or highly restrained joints.
Why is impact toughness important for S355J0?
Impact toughness is critical in preventing brittle fracture under sudden loads or low-temperature conditions. S355J0 meets EN 10025 requirements for 0°C impact testing, making it suitable for structural applications where moderate cold-temperature performance is required. For colder environments, other grades like S355J2 or S355K2 may be preferred.
How does S355J0 compare with other structural steels?
Compared with S275JR, S355J0 has a higher yield strength, allowing for slimmer, lighter sections without compromising structural integrity. It is also more suitable for welded and fabricated structures due to its combination of strength, toughness, and weldability. Compared to high-strength quenched-and-tempered steels like S690, S355J0 is easier to fabricate and weld but offers lower strength, making it more economical for general construction.
What fabrication considerations are recommended for S355J0?
While S355J0 is easier to work with than higher-strength steels, careful attention should still be given to plate thickness, welding procedure, and inspection of critical joints. For heavy welded structures, controlling interpass temperature, avoiding excessive heat input, and ensuring proper post-weld inspection will maintain the material's strength and toughness.