In modern engineering, construction, and manufacturing, the selection of structural steel directly affects project safety and cost control.
S355J0 H Beam is widely used across various fields due to its excellent performance. The S355J0H structural steel provided by Gnee is known for its stable quality and reliable performance, making it a popular choice in engineering applications.
Chemical Composition of S355J0 H Structural Steel
| Element | Content |
|---|---|
| Carbon (C) | ≤ 0.22% |
| Silicon (Si) | ≤ 0.55% |
| Manganese (Mn) | ≤ 1.60% |
| Phosphorus (P) | ≤ 0.030% |
| Sulfur (S) | ≤ 0.030% |
| Nitrogen (N) | ≤ 0.012% |
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Mechanical & Physical Properties of S355J0H Structural Steel
| Property | Value |
|---|---|
| Standard | EN 10210-1 |
| Steel Type | Hot finished hollow structural steel |
| Yield Strength | ≥ 355 MPa (depends on thickness) |
| Tensile Strength | 470–630 MPa |
| Impact Toughness | 27 J at 0°C |
| Elongation | ≥ 20–22% (depends on section) |
| Modulus of Elasticity | 210 GPa |
| Density | 7.85 g/cm³ |
S355J0 H structural steel is a European standard high-strength low-alloy structural steel with a specified yield strength of 355 MPa, approximately 30% higher than that of ordinary carbon structural steel, making it suitable for high-load applications.
It is also required to meet strict low-temperature impact toughness performance, with an impact energy of at least 27 J at 0°C, ensuring stable performance in cold regions and low-temperature working conditions.
Gnee's S355J0H structural steel demonstrates significant advantages in quality control. It is produced using advanced hot continuous rolling technology, ensuring high dimensional accuracy, with flange width tolerance controlled within ±0.5 mm and a smooth, consistent surface finish.
During the smelting process, chemical composition is strictly controlled, with reduced levels of harmful elements such as phosphorus and sulfur, ensuring consistency in mechanical properties from the source.
In terms of quality inspection, the product follows a high proportion of factory testing and sampling inspection procedures. Dimensional inspection coverage reaches 100%, while key batches are tested by heat number for chemical composition and mechanical properties.
The sampling rate is typically no less than 10%–20%, and third-party re-inspection (such as SGS or BV) can be conducted when required. The overall factory pass rate remains above 99%, ensuring that each batch complies with European structural steel standards (EN 10210 / EN 10025) and meets stringent requirements for safety and structural reliability.
Application case of S355J0 H structural steel
Gnee has been steadily supplying S355J0 H structural steel for use in internal reinforcement structures and key load-bearing components of wind turbine towers, with applications mainly in offshore wind power projects across Europe and Southeast Asia.
One representative project is located in a coastal wind farm in Southeast Asia, featuring 3MW–5MW wind turbine units. The site is exposed to long-term high humidity, high salinity, and strong wind conditions, which impose strict requirements on steel strength, toughness, and corrosion resistance.
The average steel consumption per turbine tower is approximately 90–130 tons per unit, of which S355J0 H structural steel accounts for about 15–25 tons per unit. It is primarily used in internal support components, stiffening ribs, and connecting structural parts.
With a specified yield strength of 355 MPa and impact toughness at 0°C, S355J0H maintains stable mechanical performance under low-temperature and complex marine climatic conditions. In addition, it offers excellent weldability and dimensional stability, meeting the requirements of segmented tower fabrication and on-site assembly.
During the subsequent expansion phase of the project, the client placed repeat orders based on previous supply performance and extended the application of Gnee products to multiple wind turbine tower sub-projects.
This case demonstrates that S355J0 H structural steel has strong adaptability in overseas wind turbine tower structures, particularly for renewable energy steel applications in medium-to-high wind speed, coastal, and low-temperature environments.
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If you require S355J0 H-beams, we can provide various specifications, customized lengths according to project requirements, as well as complete technical documentation support to help you quickly match your engineering application needs.
What grade of steel is S355J0?
S355J0 is a non-alloy structural steel grade defined by the EN 10025-2 standard. The "S" denotes "structural," indicating its use in constructing buildings, machinery, or infrastructure.
Is S355 mild steel or stainless steel?
What S235, S275 & S355 Really Mean Under BS EN 10025. S235, S275 and S355 are structural mild steel grades defined under BS EN 10025-2, which sets the technical delivery conditions for hot rolled non-alloy structural steels.
What is the difference between S355JR and S355J0?
While both S355JR and S355J0 are structural steels with similar chemical compositions, the key difference lies in their impact requirements and usage scenarios. S355J0 possesses slightly stronger mechanical properties, making it suitable for applications requiring higher strength.
Is S355 equivalent to A36?
S355JR and A36 are not directly equivalent, as S355JR has higher strength (yield 355 MPa vs. A36's 250 MPa) and guaranteed impact toughness, making it closer to ASTM A572 Grade 50 than A36. A36 is often equivalent to S235JR (yield 235 MPa), a lower EN grade.