I. Overview of EN 10219 Cold-Formed Welded Square Hollow Sections
EN 10219 cold-formed welded square hollow section is a type of structural pipes product manufactured according to the European standard EN 10219.
This product is manufactured using a cold-forming process, where steel strips or plates are continuously formed and then welded.
EN 10219 cold-formed welded square hollow section features good dimensional accuracy, stable mechanical properties, and excellent structural load-bearing capacity, and is widely used in building structures, steel structure engineering, machinery manufacturing, and infrastructure construction.
Compared to hot-formed hollow sections, EN 10219 cold-formed square tubes are processed at room temperature, which allows for better control of external dimensions and surface quality. It is a structural profile frequently used in modern steel structure engineering.
II. Characteristics and Advantages of EN 10219 Cold-Formed Welded Square and Rectangular Tubes
- High structural strength and stable load-bearing performance
Square and rectangular cross-sections exhibit balanced performance when subjected to axial pressure, bending moments, and torsional forces, making them particularly suitable for load-bearing structures and frame systems. - High dimensional accuracy and regular appearance
The cold-forming process allows for more precise control of the outer diameter, side length, and wall thickness, facilitating subsequent assembly and construction and improving engineering efficiency. - Good welding and processing performance
EN 10219 cold-formed welded square hollow section exhibit stable welding quality and are suitable for conventional welding, cutting, drilling, and other secondary processing techniques, meeting the needs of complex structural designs. - High material utilization and good economic efficiency
The hollow cross-section reduces material consumption while maintaining strength, contributing to overall structural weight reduction and lower engineering costs.
III. Commonly Used Steel Grades
i. Common steel grades under the EN 10219 standard include:
- S235JRH: Suitable for general structural purposes, offering good value for money.
- S275J0H / S275JRH: Higher strength, suitable for medium-load bearing structures.
- S355J0H / S355J2H: High-strength structural steel, widely used in large buildings and heavy steel structures.
Different steel grades vary in yield strength, low-temperature impact performance, etc., and should be selected appropriately based on design requirements.
ii. Comparison Table of Mechanical Properties for Different Steel Grades according to EN 10219
| Steel Grade | Minimum Yield Strength ReH (MPa) | Tensile Strength Rm (MPa) | Minimum Elongation A (%) | Impact Test Requirement |
|---|---|---|---|---|
| S235JRH | ≥ 235 | 360 – 510 | ≥ 26 | Room temperature (no specified impact value) |
| S275JRH | ≥ 275 | 370 – 530 | ≥ 23 | Room temperature (no specified impact value) |
| S275J0H | ≥ 275 | 370 – 530 | ≥ 23 | 0 °C, 27 J |
| S355J0H | ≥ 355 | 470 – 630 | ≥ 22 | 0 °C, 27 J |
| S355J2H | ≥ 355 | 470 – 630 | ≥ 22 | −20 °C, 27 J |
IV. EN 10219 Cold-Formed Welded Square Hollow Section Application Fields
- Building Steel Structures
EN 10219 cold-formed welded square hollow section used for beams, columns, and frame systems in industrial plants, warehouses, commercial buildings, and multi-story steel structures. - Bridges and Infrastructure Engineering
Suitable for bridge auxiliary structures, guardrail supports, maintenance walkways, and traffic facility structural components. - Mechanical Equipment and Industrial Frames
EN 10219 cold-formed welded square hollow section used for equipment bases, machine frames, conveyor system support structures, and automation equipment structural components. - Curtain Walls and Architectural Decoration Structures
Applied in glass curtain wall frames, canopies, steel structure facades, and decorative support systems. - Energy and Public Utilities
Used for power transmission towers, photovoltaic brackets, pipe rack supports, and public utility structural components. - Warehousing and Logistics Systems
Rack systems, automated warehouse structural frames, and heavy-duty storage equipment support structures.
V. EN 10219 Cold-Formed Welded Square Hollow Section Selection Recommendations
- Select the appropriate steel grade based on load requirements
When selecting an EN 10219 Cold-Formed Welded Square Hollow Section, the steel grade should match the actual load conditions of the structure:
General structures or non-critical load-bearing parts: S235JRH
Medium-load structural applications: S275JRH / S275J0H
High-load or safety-critical structures: S355J0H / S355J2H - Consider the operating and service temperature
For low-temperature environments or long-term outdoor applications, J0 or J2 grades are recommended. These grades provide improved low-temperature impact toughness, helping to ensure structural safety and long-term reliability. - Optimize wall thickness and cross-sectional dimensions
Instead of simply increasing wall thickness, it is more efficient to optimize the cross-sectional dimensions while meeting strength requirements. Proper section selection can reduce material consumption, lower overall weight, and improve cost efficiency. - Evaluate surface corrosion protection requirements
For outdoor, humid, or corrosive environments, hot-dip galvanizing or suitable anti-corrosion coatings are recommended. These protective measures significantly extend the service life of the EN 10219 Cold-Formed Welded Square Hollow Section and help reduce long-term maintenance costs. - Confirm dimensional tolerances and weld quality standards
For projects requiring high assembly accuracy, clearly specify EN 10219-2 dimensional tolerances and weld inspection requirements at the procurement stage. This helps minimize fabrication deviations and avoid rework during installation and construction.
