EN 10219 S355JRH structural steel pipe

What Is EN 10219 S355JRH?

EN 10219 S355JRH refers to cold-formed welded hollow structural sections (HSS) manufactured in accordance with the European standard EN 10219, with material grade S355JRH.

It is widely used in structural engineering where high load-bearing capacity, weldability, and dimensional precision are required.

Compared with S235JRH, S355JRH provides higher yield strength (355 MPa) while maintaining good toughness and fabrication performance, making it suitable for demanding structural applications.

EN 10219 Standard Overview

About EN 10219

EN 10219 specifies technical delivery conditions for:

Cold-formed welded hollow sections

Non-alloy structural steel

Fine-grain structural steel

It covers:

Manufacturing process requirements

Dimensional tolerances (EN 10219-2)

Mechanical properties

Chemical composition

Surface quality

This ensures high product consistency, structural reliability, and interchangeability, especially for safety-critical engineering projects.

S355JRH Grade Breakdown

Key Mechanical Properties of S355JRH Hollow Sections

Yield Strength (ReH): ≥ 355 MPa

Tensile Strength (Rm): 510–680 MPa

Elongation (A): ≥ 20%

Impact Energy (Charpy V): ≥ 27 J at +20°C

Important Note:
S355JRH does not guarantee impact performance at -20°C.
For low-temperature environments, select:

S355J2H (guaranteed ≥27 J at -20°C)

Core Advantages of S355JRH Hollow Sections

1. High Strength with Reliable Room-Temperature Toughness

355 MPa yield strength enables medium to heavy load-bearing applications.

Adequate impact resistance under normal structural conditions.

Suitable for static and dynamic load structures.

2. Excellent Weldability and Fabrication Performance

Controlled Chemical Composition

Carbon ≤ 0.22%

Optimized Mn and Si content

This ensures:

Good weldability

Reduced heat-affected zone (HAZ) cracking risk

Compatibility with common welding processes:

Manual arc welding

GMAW (gas shielded welding)

SAW (submerged arc welding)

Preheating is typically not required under standard conditions.

Cold-Forming Advantages

As a cold-formed product, S355JRH offers:

Good plastic deformation capacity

Easy cutting, drilling, stamping

Strong adaptability to secondary fabrication

3. High Dimensional Accuracy & Surface Quality

Cold-forming technology ensures:

Uniform wall thickness

Regular cross-sectional geometry

Sharp corners (for SHS/RHS)

Dimensional tolerances strictly follow EN 10219-2, ensuring:

High interchangeability

Efficient on-site assembly

Reduced installation corrections

Available Shapes & Specification Range  of S355JRH Structural Steel Pipe

S355JRH hollow sections are produced in:

1. Circular Hollow Sections (CHS)

OD range: φ21.3 mm – φ2500 mm+

Common sizes:

φ219 mm

φ273 mm

φ323.9 mm

φ355.6 mm

φ406.4 mm

φ508 mm

Wall thickness: 2 mm – 50 mm

2. Square Hollow Sections (SHS)

Size range: 20×20 mm – 400×400 mm

Wall thickness: 1.5 mm – 40 mm

3. Rectangular Hollow Sections (RHS)

Size range: 50×30 mm – 500×300 mm

Wall thickness: 1.5 mm – 40 mm

Applications of S355JRH Structural Steel Pipe

Due to its balance of strength, toughness, and workability, S355JRH is widely used in:

1. Building & Structural Engineering

Bridges

High-rise building supports

Steel frames

Large-span trusses

2. Machinery Manufacturing

Heavy equipment frames

Load-bearing components

Crane booms

3. Energy & Industrial Projects

Wind turbine towers

Solar PV supports

Structural pipelines

Pressure-related structures (subject to project certification requirements)

4. Marine & Offshore Engineering

Offshore platforms

Steel pile structures

Dock support systems

5. Infrastructure Projects

Temporary structural supports

Heavy-duty structural frames

Why S355JRH Is Widely Specified

355 MPa yield strength → Higher load capacity

Good weldability → Efficient fabrication and on-site assembly

Balanced mechanical performance → Strength + toughness + ductility

Dimensional precision → Reduced installation time

Procurement & Application Recommendations

1. Confirm Impact Temperature Requirements

If your project:

Is located in cold climates

Involves winter construction

Requires sub-zero toughness

Choose S355J2H instead of S355JRH.

2. Verify Material Certification

Request:

EN 10204 Type 3.1 certificate

Verify:

Chemical composition

Mechanical properties

Heat number traceability

3. On-Site Inspection Checklist

Upon delivery:

Measure wall thickness with calipers

Check side length / OD tolerances

Verify straightness

Inspect surface defects

For critical structures, third-party re-inspection is recommended.

4. Corrosion Protection Strategy

S355JRH is carbon steel and does not provide intrinsic corrosion resistance.

For outdoor or humid environments:

Hot-dip galvanizing

Epoxy coating systems

Zinc-rich primers

Proper anti-corrosion design extends service life significantly.

FAQ

Q1: What is the difference between S355JRH and S235JRH?

S355JRH offers higher yield strength (355 MPa vs 235 MPa), enabling greater load-bearing capacity while maintaining similar weldability.

Q2: Is S355JRH suitable for low-temperature environments?

No. It only guarantees impact energy at +20°C.
For -20°C applications, use S355J2H.

Q3: Is S355JRH seamless or welded?

Under EN 10219, it refers to cold-formed welded hollow sections, not seamless pipes.

Q4: Does S355JRH require galvanizing?

If exposed to corrosive environments, yes. It is not inherently corrosion-resistant.

Conclusion

EN 10219 S355JRH is a high-strength cold-formed welded hollow structural steel grade widely used in construction, infrastructure, machinery, and energy sectors.

Its advantages include:

355 MPa yield strength

Reliable room-temperature toughness

Excellent weldability

High dimensional precision

Strong fabrication adaptability

When selecting S355JRH, always confirm impact requirements, certification compliance, and corrosion protection strategy to ensure full structural safety and lifecycle performance.