EN 10219 Cold-formed welded structural hollow sections
EN 10219 Cold-formed welded structural hollow sections
EN 10219 is a European standard that specifies technical delivery conditions for cold-formed welded structural hollow sections of non-alloy and fine-grain steels. These sections are widely used in construction, mechanical engineering, and structural applications due to their high strength, durability, and weldability.
| Parameter | Details |
| Standard | EN 10219-1, EN 10219-2 |
| Product Name | Cold-Formed Welded Structural Hollow Sections |
| Material Grades | S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S420MH, S460MH |
| Shape | Circular, Square, Rectangular |
| Manufacturing Process | Cold-formed, Electric Resistance Welded (ERW) or Submerged Arc Welded (SAW) |
| Surface Finish | Black, Galvanized, Painted, Oiled |
| Dimensions | – Circular: Ø 21.3 mm – 1219 mm |
| – Square: 20×20 mm – 800×800 mm | |
| – Rectangular: 40×20 mm – 1000×500 mm | |
| Thickness Range | 1.5 mm – 40 mm |
| Length | Up to 12 meters (Custom lengths available) |
| Applications | Structural Engineering, Construction, Bridges, Offshore Structures, Mechanical Engineering |
| Key Features | High Strength, Excellent Weldability, Precise Dimensions, Corrosion Resistance (with Coating), Lightweight & Cost-Effective |
EN 10219 Chemical Composition
| Grade | C (Max) | Si (Max) | Mn (Max) | P (Max) | S (Max) | Nb (Max) | V (Max) | Ti (Max) |
|---|---|---|---|---|---|---|---|---|
| S235JRH | 0.17 | 0.035 | 1.40 | 0.035 | 0.035 | – | – | – |
| S275J0H | 0.20 | 0.035 | 1.50 | 0.030 | 0.030 | – | – | – |
| S275J2H | 0.20 | 0.035 | 1.50 | 0.030 | 0.030 | – | – | – |
| S355J0H | 0.22 | 0.55 | 1.60 | 0.030 | 0.030 | 0.05 | 0.12 | 0.05 |
| S355J2H | 0.22 | 0.55 | 1.60 | 0.030 | 0.030 | 0.05 | 0.12 | 0.05 |
| S355K2H | 0.22 | 0.55 | 1.60 | 0.030 | 0.030 | 0.05 | 0.12 | 0.05 |
EN 10219 Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test (J) @ -20°C |
| S235JRH | ≥ 235 | 360 – 510 | ≥ 26 | – |
| S275J0H | ≥ 275 | 370 – 530 | ≥ 23 | ≥ 27 |
| S275J2H | ≥ 275 | 370 – 530 | ≥ 23 | ≥ 27 |
| S355J0H | ≥ 355 | 470 – 630 | ≥ 22 | ≥ 27 |
| S355J2H | ≥ 355 | 470 – 630 | ≥ 22 | ≥ 27 |
| S355K2H | ≥ 355 | 470 – 630 | ≥ 22 | ≥ 40 |
EN 10219 Physical Properties
| Property | Value |
| Density | 7.85 g/cm³ |
| Elastic Modulus | ~ 210 GPa |
| Thermal Conductivity | ~ 50 W/m·K |
| Specific Heat Capacity | ~ 0.49 J/g·K |
| Coefficient of Thermal Expansion | ~ 12 × 10⁻⁶ /°C |
Standard & Grade
1. Non-Alloy Structural Steel Grades
- S235JRH
- S275J0H
- S275J2H
- S355J0H
- S355J2H
- S355K2H
2. Fine-Grain Structural Steel Grades
- S420MH
- S460MH
- S500MH
- S550MH
- S620MH
- S700MH
Manufacturing Process
- Material Selection
- The process starts with hot-rolled steel coils or plates made from non-alloy or fine-grain structural steel.
- These raw materials meet the required chemical composition and mechanical properties per EN 10219 standards.
- Cold Forming Process
- The steel coil is uncoiled, leveled, and fed into a forming machine.
- Through a series of rollers, the flat steel is gradually shaped into the desired hollow section profile (circular, square, or rectangular).
- Unlike hot-finished sections (EN 10210), no heat is applied during shaping, ensuring a precise and smooth finish.
- Welding (ERW or SAW Process)
- The edges of the formed steel strip are heated and fused using Electric Resistance Welding (ERW) or Submerged Arc Welding (SAW) to form a continuous tube.
- The weld seam is then inspected for integrity and strength.
- Sizing & Straightening
- The welded tube passes through sizing rollers to achieve the exact dimensions, wall thickness, and tolerance requirements.
- Further straightening is done to remove any distortions from the forming process.
- Cutting & End Finishing
- The hollow section is cut into standard or custom lengths as per customer requirements.
- The ends are deburred, chamfered, or finished for better handling and assembly.
- Heat Treatment (If Required)
- Cold-formed EN 10219 tubes do not undergo heat treatment unless specified for stress relief.
- However, normalizing may be applied in certain cases to enhance mechanical properties.
- Inspection & Testing
- Non-destructive testing (NDT) methods like ultrasonic, eddy current, or radiographic testing ensure weld integrity and detect internal flaws.
- Mechanical tests (tensile, impact, hardness) and chemical composition analysis verify compliance with EN 10219 specifications.
- Dimensional accuracy, surface finish, and straightness are also inspected.
- Marking & Surface Protection
- Each hollow section is marked with the standard, grade, size, batch number, and manufacturer details.
- Protective coatings (galvanization, painting, or oiling) may be applied to prevent corrosion.
Applications
- Construction & infrastructure (bridges, buildings, stadiums)
- Mechanical engineering
- Offshore structures
- Transport & automotive industries
- Renewable energy (wind towers, solar panel frames)
