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what is EN 10219 S355 series Hollow section ?
EN 10219 S355 series steel grade pipes, such as S355J0H, S355J2H, and S355NH, are designed for structural applications and offer a range of mechanical properties and chemical compositions that make them suitable for various industries. These pipes are known for their high strength, with a minimum yield strength of 355 MPa, and good weldability, which allows for easy fabrication without the risk of brittle fracture. They also exhibit good impact resistance, making them suitable for use in cold conditions. The S355 series is manufactured through cold forming, resulting in a finer grain structure and better surface finish. Applications include agricultural equipment, architectural structures, construction frameworks for bridges and buildings, mechanical equipment, and transportation construction. The pipes are available in various sizes and can be coated with black paint, varnish, or anti-rust oil as required.
basic information
EN 10219 S355 Series HOLLOW SECTION
GRADE: S355J0H,S355J2H,S355NH,S355NLH,S355MH,S355MLH
Outside Diameter:
1/2 INCH - 24 INCH(CHS)
20MM × 20MM - 1200MM × 1200MM(SHS)
20MM × 30MM - 1000MM × 1500MM(RHS)
Wall Thickness:
1.3MM - 22MM(CHS)
1.3MM - 50MM(SHS,RHS)
LENGTH:Commonly used 5.8M, 6M, 12M, but we can also produces depends on client's requirement.
Pipe End: Flat end, Chamfer end, Groove, Thread
Coating: Black paint, Varnish, Anti-rust oil
Applications: agricultural equipment, architectural structures, construction frameworks for bridges and buildings, mechanical equipment, and transportation construction.
Chemical Composition
| Chemical Composition,max,% | ||||||
| S355J0H | S355J2H | S355NH | S355NLH | S355MH | S355MLH | |
| Carbon (C) | 0.24% | 0.22% | 0.20% | 0.20% | 0.20% | 0.20% |
| Silicon(Si) | 0.55% | 0.55% | 0.55% | 0.55% | 0.55% | 0.55% |
| Manganese (Mn) | 1.60% | 1.60% | 1.60% | 1.60% | 1.60% | 1.60% |
| Phosphorus (P) | 0.035% | 0.035% | 0.035% | 0.035% | 0.035% | 0.035% |
| Sulfur (S) | 0.035% | 0.035% | 0.035% | 0.035% | 0.035% | 0.035% |
| Nitrogen (N) | 0.012% | - | - | - | - | - |
| Copper (Cu) | 0.55% | - | - | - | - | - |
- S355J0H, The low carbon content ensures good weldability and formability. The manganese content provides strength and toughness.
- S355J2H, Similar to S355J0H, but with a slightly lower carbon content, which further enhances weldability and impact resistance.
- S355NH, The lower carbon content and the addition of microalloying elements like niobium (Nb) and vanadium (V) provide improved strength and toughness, especially at lower temperatures.
- S355NLH, Similar to S355NH, but with a focus on improved low-temperature impact resistance, making it suitable for cold environments.
- S355MH, The "M" indicates that the steel is normalized, which provides a fine-grained structure and improved mechanical properties, especially in terms of strength and toughness.
- S355MLH, Similar to S355MH, but with a focus on low-temperature impact resistance, making it suitable for applications in cold climates.
Mechanical properties
| Mechanical properties | ||||||
| S355J0H | S355J2H | S355NH | S355NLH | S355MH | S355MLH | |
| Tensle strength, psi [MPa] |
470 - 630 MPa | 470 - 630 MPa | 470 - 630 MPa | 470 - 630 MPa | 450 - 610 MPa | 450 - 610 MPa |
| Yield strength, min,psi[MPa] |
355 (for wall thickness ≤ 16 mm) |
355 | 355 | 355 | 355 | 355 |
| Elongation | ≥ 20% | ≥ 20% | ≥ 20% | ≥ 20% | ≥ 22% | ≥ 22% |
| Impact Energy | ≥ 27 J at 0°C | ≥ 27 J at -20°C | ≥ 40 J at -20°C | ≥ 40 J at -50°C | ≥ 40 J at -20°C | ≥ 40 J at -50°C |
- S355J0H, Provides good strength and impact resistance, suitable for general structural applications.
- S355J2H, Higher impact resistance and better weldability, suitable for applications requiring higher dynamic load resistance.
- S355NH, Improved low-temperature impact resistance, suitable for cold environments and applications requiring high strength and toughness.
- S355NLH, Excellent low-temperature impact resistance, suitable for cold environments and applications requiring high strength and toughness.
- S355MH, Normalized structure provides improved strength and toughness, suitable for heavy-duty applications.
- S355MLH, Excellent low-temperature impact resistance and normalized structure, suitable for heavy-duty applications in cold climates.
the Differences between J0H, J2H, NH, NLH, MH, MLH
J0H, J2H, NH, NLH, MH, and MLH are designations used in European steel standards to indicate the impact resistance of steel at different temperatures.
- J0H requires an impact energy of at least 27 Joules at 0°C, suitable for general applications.
- J2H demands 27 Joules at -20°C, making it appropriate for colder climates.
- NH also requires 40 Joules at -20°C, offering higher impact resistance in cold conditions.
- NLH needs 27 Joules at -50°C, suitable for extremely cold environments.
- MH is similar to NH but with a higher impact energy requirement of 40 Joules at -20°C, providing enhanced safety in cold settings. MLH, like NLH, requires 27 Joules at -50°C, but has broader applications in extreme cold conditions.
The key differences lie in the temperature at which the impact tests are conducted and the required impact energy, which determine their suitability for various environmental and safety-critical applications.
Manufacturing Process
Cold Formed Welded Hollow Sections: All grades are typically manufactured using cold forming and welding processes, ensuring consistent quality and dimensional accuracy.
- Raw Material Selection: High-quality steel plates or strips that meet the EN 10219 standard are selected as raw materials.
- Cold Forming: The steel is cold-formed into the desired shape, resulting in a finer grain structure and better surface finish.
- Welding: Electric resistance welding (ERW) is commonly used to join the edges of the steel to form the pipe. This process ensures a strong and consistent weld.
- Quality Control: The pipes undergo various tests such as tensile testing, flattening tests, and impact tests to ensure they meet the required mechanical properties.
- Coating: The pipes can be coated with black paint, varnish, or anti-rust oil to protect against corrosion, as required by the customer.
Advantages
High Strength:
The S355 grades have the highest yield and tensile strengths, making them ideal for heavy-load-bearing structures.
Good Weldability:
These grades are designed to be easily welded, which is crucial in construction and manufacturing.
Versatility:
Available in various grades to meet different temperature and strength requirements, ensuring flexibility in application.
Regulatory Compliance:
Adherence to EN 10219 ensures that products meet high-quality standards, which is essential for CE marking and international trade.
EN 10219 S355 series steel grade pipes are widely used in various industries due to their high strength and good weldability. Some of the key applications include:
- Construction: Used in the construction of buildings, bridges, and towers, especially in the form of Circular Hollow Sections (CHS), Square Hollow Sections (SHS), and Rectangular Hollow Sections (RHS). These hollow sections provide stable support and reliable load-bearing capacity.
- Mechanical Industries: Employed in the manufacturing of machinery where high strength and durability are required.
- Infrastructure: Utilized in infrastructure projects such as oil and gas pipelines, water and electricity facilities, and environmental protection structures.
- Marine Applications: Suitable for marine platforms and other structures that require high strength and corrosion resistance.
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