EN 10219 S355JRH Structural Steel Pipe

EN 10219 S355JRH refers to cold-formed welded hollow structural steel profiles manufactured according to the European standard EN 10219, with a material grade of S355JRH. S355JRH is an upgraded version of S235JRH, offering higher strength while maintaining good weldability, making it suitable for engineering scenarios with higher requirements for load-bearing capacity and safety.

Standard and Material Explanation:

EN 10219: This is the EU technical specification for welded cold-formed hollow profiles (such as square and rectangular tubes) of non-alloy and fine-grained structural steel. It strictly stipulates the requirements for pipe manufacturing processes, dimensional tolerances, mechanical properties, chemical composition, and surface quality, ensuring high consistency and reliability of the product, making it particularly suitable for projects with high structural safety requirements.

S355JRH: This is the steel grade, with the following meanings:

S: Represents Structural Steel. 355: Represents the minimum yield strength of this steel as 355 MPa (applicable to wall thickness ≤ 16 mm). This value ensures the material can withstand medium to high strength loads and is one of the most widely used structural steel grades in European and international engineering.
JR: Indicates that the steel has an impact energy ≥ 27 J when subjected to impact testing at room temperature (+20°C). This demonstrates its good toughness and ability to resist impact loads.
H: Represents hollow section steel.

Advantages of S355JRH Structural Steel Pipe:

1. High strength and reliable room temperature toughness
Strength grade: According to EN 10219 standard, S355JRH has a minimum yield strength of 355 MPa (applicable to wall thickness ≤ 16 mm), a tensile strength range of 510 – 680 MPa, and an elongation (A) ≥ 20%.

Impact Toughness: Guaranteed Charpy V-type impact energy (kV) ≥ 27 J at room temperature (+20°C), meeting the structural resistance to brittle fracture requirements under normal conditions.

Note: S355JRH does not guarantee impact performance at -20°C. If the project requires low-temperature toughness, it is recommended to use S355J2H (guaranteed impact at -20°C).

2. Excellent Welding and Cold Working Performance
Low Carbon Design: Carbon content is strictly controlled at ≤0.22%, combined with reasonable manganese and silicon content, ensuring excellent weldability. Suitable for conventional processes such as manual arc welding, gas shielded welding, and submerged arc welding, requiring no preheating or complex post-weld heat treatment, effectively preventing heat-affected zone cracking in welds.

Processing Adaptability: As a cold-formed product, the material retains good plasticity, easily undergoing secondary processing such as cutting, drilling, stamping, and cold bending, flexibly adapting to various complex design requirements.

3. High Dimensional Accuracy and Surface Quality

Precision Forming: Utilizing high-precision cold bending forming technology, ensuring regular cross-sectional shapes, sharp edges, and uniform wall thickness for square and rectangular tubes.

Strict Tolerances: Outer diameter, side length, and straightness all adhere to the strict tolerance standards of EN 10219-2, guaranteeing high interchangeability and assembly efficiency of components on-site, reducing on-site adjustments and rework.

Common Specification Range: 

S355JRH steel pipes can be manufactured in circular (CHS), square (SHS), and rectangular (RHS) cross-sections.

a. Round Tubes
Common outer diameter range: φ21.3mm - φ2500mm and above. Common specifications include: φ219mm, φ273mm, φ323.9mm, φ355.6mm, φ406.4mm, φ508mm, etc.
Wall Thickness Range: 2mm - 50mm.

b. Square and Rectangular Tubes
Common side lengths for square tubes: 20×20mm - 400×400mm;
Common side lengths for rectangular tubes: 50×30mm - 500×300mm;
Wall thickness range: 1.5mm - 40mm.

Applications:

S355JRH, due to its higher strength, is widely used in engineering scenarios with higher requirements for load-bearing capacity and safety.

1. Building Structures: Such as bridges, supporting frames for high-rise buildings, steel structural frames, and large-span truss structures.
2. Machinery Manufacturing: Used for manufacturing heavy equipment for engineering machinery, load-bearing structural components, and crane booms.
3. Energy and Chemical Industries: Used for pipelines, pressure vessels (requires EN 1090 certification), wind turbine towers, and solar photovoltaic supports.
4. Shipbuilding and Marine Engineering: Used for ship hull structures, offshore platform components, steel pile structures, dock supports, and foundation engineering.
5. Infrastructure: Temporary supports and heavy structural frames.

Why is S355JRH widely used in these fields?

Excellent flexural strength: Its yield strength of 355 MPa allows it to withstand higher loads;
Good weldability: Facilitates on-site construction and joint connections;
Reliable overall performance: A balance of strength, toughness, and workability.

Purchasing and Application Recommendations:

1. Clarify impact temperature requirements: If your project is located in a cold region or involves winter construction, be sure to confirm whether -20°C impact toughness is required and choose S355J2H instead of S355JRH accordingly.
2. Verify material certificates: Request the supplier to provide an EN 10204 Type 3.1 material certificate during procurement, verify the chemical composition and mechanical property data, and ensure that the material meets the standard requirements.
3. On-site inspection points: Randomly sample upon arrival, measure the wall thickness and side length with calipers, and check whether they are within the standard tolerance range. For important structures, a third party can be commissioned to conduct a re-inspection.
4. Corrosion protection: As a carbon steel, S355JRH is not inherently corrosion-resistant. For use outdoors or in humid environments, hot-dip galvanizing or coating protection is required.