EN 10219 ERW pipe

EN 10219 ERW pipe refers to cold-formed welded structural hollow sections manufactured to the EN 10219 standard, rather than a general-purpose pressure pipe. The standard covers circular, square, and rectangular hollow sections used mainly for structural applications. EN 10219-1 specifies technical delivery conditions, while EN 10219-2 covers dimensions, tolerances, and sectional properties. Common grades include S235JRH, S275J0H, S275J2H, S355J0H, and S355J2H.

What is EN 10219 ERW steel pipe?

Standard EN 10219 specifies cold-formed welded hollow steel sections made of non-alloy steel and fine-grained steel. ERW steel pipes produced in accordance with this standard usually include circular, square and rectangular cross-sections. The manufacturing process involves rolling steel strips into the required shape and then performing resistance welding with high-frequency current to obtain pipes with uniform wall thickness, precise dimensions and smooth surface.

EN 10219 steel grades

EN 10219 includes several structural steel grades. The most commonly specified grades for welded hollow sections include S235JRH, S275J0H, S275J2H, S355J0H, and S355J2H.

Grade	Minimum yield strength*	Impact designation	Typical use
S235JRH	235 MPa	JR: 27 J at +20°C	General structural applications
S275J0H	275 MPa	J0: 27 J at 0°C	Structural frames and machinery
S275J2H	275 MPa	J2: 27 J at -20°C	Structures requiring improved low-temperature toughness
S355J0H	355 MPa	J0: 27 J at 0°C	Heavy structural applications
S355J2H	355 MPa	J2: 27 J at -20°C	Heavy structures and demanding service conditions

*Yield strength values depend on product thickness. For example, EN 10219 material tables specify reductions in minimum yield strength for thicker sections.

The designation also provides useful information about the material. The number 235, 275, or 355 refers to the nominal minimum yield strength in MPa for the relevant thickness range. JR, J0, and J2 identify different impact toughness requirements, while H indicates a hollow section.

For example, S355J2H is a structural hollow section grade with a nominal 355 MPa yield strength for the applicable thickness range and a specified impact toughness requirement at -20°C.

EN 10219 ERW Steel Pipe Manufacturing Process

The typical manufacturing process for EN 10219 ERW (High-Frequency Electric Resistance Welded) hollow sections involves the following stages:

1. Steel Coil Preparation

Steel strips or coils with specified chemical compositions and mechanical properties are prepared for forming. Material grades are selected based on the structural requirements of the project.

2. Cold Forming

The steel strip is progressively formed into a circular, square, or rectangular hollow section at ambient temperature.

3. ERW Welding

For ERW products, the longitudinal edges of the steel strip are joined using the electric resistance welding process. Welding parameters are controlled to ensure the formation of a continuous and uniform weld seam.

4. Sizing

After welding, the section passes through sizing equipment to achieve the specified external dimensions and cross-sectional geometry.

5. Cutting and Inspection

The hollow sections are cut to the specified lengths and inspected for dimensional accuracy, weld seam quality, surface condition, and other requirements.

EN 10219 vs EN 10210

Feature	EN 10219	EN 10210
Product type	Cold-formed welded structural hollow section	Hot-finished structural hollow section
Typical manufacturing condition	Formed cold	Hot finished or otherwise supplied according to EN 10210 requirements
Cross-sections	Circular, square, rectangular; current development also addresses elliptical sections	Circular, square, rectangular; hot-finished sections
Main standard parts	EN 10219-1 and EN 10219-2	EN 10210-1 and EN 10210-2
Main focus	Delivery conditions, dimensions, tolerances and sectional properties	Delivery conditions, dimensions, tolerances and sectional properties
Structural design	Sectional properties must be taken from the applicable standard	Sectional properties must be taken from the applicable standard

An important point is that equivalent steel grades do not automatically mean equivalent structural sectional properties. EN 10219-2 and EN 10210-2 specify different sectional properties for square and rectangular hollow sections. Therefore, engineers should use the properties corresponding to the actual product standard rather than substituting one standard for the other.

The advantages of EN 10219 ERW steel pipe

High strength and toughness: Suitable for load-bearing structures and complex projects.

Excellent welding performance: The weld seam performance is close to that of the base material, with high reliability.

High dimensional accuracy: The cold forming process ensures uniform product specifications.

Diverse shapes: Round tubes, square tubes and rectangular tubes can all be produced.

Outstanding economic performance: Compared with seamless steel pipes, the production cost is lower.

Typical application fields

EN 10219 ERW steel pipes are widely used in multiple fields:

Construction engineering: high-rise buildings, Bridges, stadiums, steel structure factories;

Mechanical manufacturing: mechanical frames, agricultural machinery equipment, lifting machinery;

Energy and Infrastructure: Wind power towers, photovoltaic brackets, power transmission structures;

Traffic and Safety: Highway guardrails, railway structures, scaffolding, storage shelves.

EN 10219 ERW pipe FAQ

1. What is EN 10219 ERW pipe?

EN 10219 ERW pipe is a cold-formed welded structural hollow section manufactured according to the EN 10219 standard. It can have a circular, square, or rectangular cross-section and is mainly used for structural applications.

2. What grades are available under EN 10219?

Common EN 10219 grades include S235JRH, S275J0H, S275J2H, S355J0H, and S355J2H. The appropriate grade depends on the required yield strength, impact toughness, thickness, temperature, and structural design conditions.

3. What is the difference between S355J2H and S235JRH?

The main difference is the specified strength level and impact toughness designation. S355J2H has a nominal 355 MPa yield strength for the applicable thickness range and J2 impact requirements at -20°C, while S235JRH has a nominal 235 MPa yield strength and JR impact requirements at +20°C.

Conclusion

With advantages such as high strength, good welding performance and superior economy, EN 10219 ERW steel pipe has become an important material in the construction, machinery and energy industries. In modern engineering projects, ERW steel pipes not only provide reliable structural support but also take into account cost and efficiency.