EN 10219-1 S235JRH is a standard and widely available material specification for manufacturing Spiral Submerged Arc Welded (SSAW) steel pipes [citation:1, citation:2, citation:4, citation:8]. This combination is a common product offered by numerous global manufacturers for structural applications such as building frames, bridge components, piling foundations, and general engineering structures requiring good strength and weldability at an economical cost [citation:1, citation:2, citation:8, citation:10].
The designation "EN 10219-1 S235JRH Spiral Submerged Arc Pipe" combines a common structural steel grade (S235JRH) with the cold-formed welded structural hollow section standard, produced using the economical spiral welding process for large-diameter, load-bearing applications [citation:1, citation:2, citation:4].
📋 Key Specifications for EN 10219-1 S235JRH SSAW Pipe
The table below summarizes the primary specifications for this product, based on comprehensive industry data [citation:1, citation:2, citation:3, citation:4, citation:6, citation:7, citation:8, citation:9, citation:10].
| Attribute | Description |
|---|---|
| Standard | EN 10219-1: "Cold formed welded structural hollow sections of non-alloy and fine grain steels - Part 1: Technical delivery conditions" [citation:1, citation:2, citation:4, citation:8]. |
| Steel Grade | S235JRH: A common non-alloy structural steel grade. "S" indicates Structural steel, "235" indicates minimum yield strength in MPa, "JR" denotes impact testing at room temperature (27J min), and "H" indicates Hollow section [citation:1, citation:5, citation:7]. |
| Material Number | 1.0039 [citation:6, citation:10]. |
| Manufacturing Process | Spiral Submerged Arc Welding (SSAW/HSAW/SAWH) : Formed from hot-rolled steel coil at room temperature, with the weld seam running continuously in a spiral along the pipe's length. Welded using double-sided automatic submerged arc welding [citation:1, citation:2, citation:4]. |
| Chemical Composition (max %) [citation:3, citation:6, citation:7, citation:10] | Carbon (C): 0.17% max Manganese (Mn): 1.40% max Silicon (Si): Not required Phosphorus (P): 0.040% max Sulfur (S): 0.040% max Aluminum (Al tot): 0.02% min (for fine grain) [citation:6, citation:7] |
| Mechanical Properties (min) [citation:3, citation:6, citation:7, citation:10] | Yield Strength (t ≤ 16mm): 235 MPa [citation:3, citation:6, citation:7, citation:10] Yield Strength (16 < t ≤ 40mm): 225 MPa [citation:3, citation:7] Tensile Strength: 360-510 MPa [citation:3, citation:6, citation:7, citation:10] Elongation (t ≤ 40mm): ≥ 24% [citation:6, citation:7, citation:10] Impact Energy: 27 J minimum at +20°C (longitudinal) [citation:6, citation:7, citation:10] |
| Carbon Equivalent (CEV) max | 0.35% [citation:6, citation:10] |
| Typical Size Range [citation:2, citation:3, citation:4, citation:8] | Outside Diameter: 219 mm to 4064 mm (approx. 8" to 160") [citation:2, citation:3, citation:4] Wall Thickness: 4.0 mm to 40 mm (common range 5-25 mm) [citation:2, citation:4, citation:8] Length: 3 m to 18 m standard; up to 70 m available for specific applications [citation:4, citation:8] |
| Dimensional Tolerances [citation:9, citation:10] | Outside Diameter: ±1% (min ±0.5mm, max ±10mm) [citation:9, citation:10] Wall Thickness (t ≤ 5mm): ±10% [citation:9, citation:10] Wall Thickness (t > 5mm): ±0.5mm [citation:9, citation:10] Straightness: ≤ 0.15-0.20% of total length, max 3mm/m [citation:9, citation:10] Mass: ±6% on individual lengths [citation:9, citation:10] |
| Key Testing Requirements [citation:1, citation:2, citation:8] | Chemical analysis; tensile test; flattening test; bend test; mandatory Charpy impact testing at +20°C (27J minimum); weld bend test; hydrostatic test (optional per project); non-destructive testing of weld seam (ultrasonic or X-ray - standard practice) [citation:1, citation:2, citation:8]. |
| Common Applications [citation:1, citation:2, citation:8, citation:10] | General structural engineering; building construction frames and columns; bridge components; piling foundations; mechanical engineering (agricultural machinery, truck/trailer construction, cranes); renewable energy structures (solar parking, solar trackers); steel structure engineering; infrastructure projects [citation:1, citation:2, citation:8, citation:10]. |
| Certification | Mill Test Certificate to EN 10204 Type 3.1 (or Type 2.2) with full test results and traceability records. CE-marking and UKCA-marking available for construction products under CPR [citation:8, citation:10]. |
📏 Grade Designation Breakdown
The designation S235JRH follows a logical structure defined in EN 10219 and EN 10025 [citation:1, citation:5, citation:7]:
| Component | Meaning |
|---|---|
| S | Structural Steel |
| 235 | Minimum yield strength of 235 MPa (for thicknesses ≤ 16mm) |
| JR | Impact test requirement: 27 Joules minimum at room temperature (+20°C) |
| H | Hollow Section (conforms to EN 10219) |
🔍 Key Points to Understand
What "EN 10219-1 S235JRH" Means: This is the European standard for cold-formed welded structural hollow sections. S235JRH is an entry-level structural steel grade, with minimum yield strength of 235 MPa and guaranteed Charpy impact toughness of 27 J at room temperature (+20°C) [citation:1, citation:5, citation:7]. The "H" suffix indicates it is a hollow section conforming to EN 10219 [citation:1, citation:5, citation:7].
Cold-Formed vs. Hot-Finished: EN 10219 specifically covers cold-formed hollow sections (produced by cold forming without subsequent heat treatment), while hot-finished structural hollow sections are covered by EN 10210 [citation:1, citation:7]. The SSAW process is a cold-forming process, making EN 10219 the correct standard for spiral welded structural tubes.
S235JRH vs. S235JR: S235JRH has the same mechanical properties as S235JR, but the "H" designation specifically qualifies it for use as a hollow section under EN 10219 [citation:1, citation:5, citation:7].
Impact Properties: The "JR" suffix guarantees a minimum impact energy of 27 J at room temperature (+20°C). This is suitable for general structural applications in mild climates. For applications requiring guaranteed impact at lower temperatures, consider S275J0H (0°C) or S275J2H (-20°C) [citation:1, citation:5, citation:7].
Weldability: S235JRH has excellent weldability with a low carbon equivalent (CEV ≤ 0.35), making it suitable for common welding methods including submerged arc welding (SAW) [citation:6, citation:10].
SSAW Advantages for S235JRH: The spiral welding process offers specific benefits for large-diameter structural pipes [citation:1, citation:2, citation:4]:
Large Diameter Capability: Can economically produce pipes up to 160" diameter – ideal for large-diameter piling and structural applications
Cost Efficiency: More economical than LSAW or seamless for very large diameters
Long Lengths: Up to 70m lengths reduce field splicing requirements
Material Efficiency: Can use narrower steel strips to produce large-diameter pipes from the same coil width
🔧 Manufacturing Process for EN 10219-1 S235JRH SSAW Pipe
The manufacturing process follows standard SSAW production methods with quality controls suitable for structural applications [citation:1, citation:2, citation:4]:
| Step | Description |
|---|---|
| 1. Raw Material Preparation | Hot-rolled steel coils meeting S235JRH chemistry requirements (C ≤ 0.17%, Mn ≤ 1.40%) are leveled, inspected, and edge-milled [citation:1, citation:2]. |
| 2. Spiral Forming | The steel strip is continuously formed into a cylindrical shape at a specific helix angle at room temperature using five-roll forming technology [citation:1, citation:2]. |
| 3. Submerged Arc Welding | Double-sided automatic submerged arc welding (inside and outside) creates the spiral seam with full penetration. A layer of granular flux covers the welding area for high-quality, spatter-free welds [citation:1, citation:2]. |
| 4. Weld Heat Treatment | The weld area typically undergoes localized normalizing heat treatment to refine grains, homogenize microstructure, and eliminate welding stress, ensuring weld properties match the base metal . |
| 5. Non-Destructive Testing | 100% ultrasonic or X-ray inspection of the weld seam is standard practice [citation:1, citation:2, citation:8]. |
| 6. Dimensional Inspection | Verification of dimensions, straightness, and end squareness per EN 10219-2 tolerances [citation:9, citation:10]. |
| 7. Mechanical Testing | Tensile tests, flattening tests, bend tests, and mandatory Charpy impact testing at +20°C to verify properties [citation:1, citation:2, citation:8]. |
| 8. End Finishing | Ends prepared (plain or beveled) for field welding; beveled ends for wall thickness > 4mm typically [citation:1, citation:2]. |
| 9. Coating | Optional external coatings (varnish, black painting, hot-dip galvanized, 3LPE, FBE) available for corrosion protection [citation:2, citation:8]. |
🏭 Applications
EN 10219-1 S235JRH SSAW pipes are widely used in structural and engineering applications [citation:1, citation:2, citation:8, citation:10]:
| Application | Description | Why S235JRH is Chosen |
|---|---|---|
| Building Construction | Columns, trusses, frames for high-rise buildings, stadiums, exhibition halls [citation:1, citation:8, citation:10] | Good strength-to-cost ratio; CE-marked for construction products |
| Piling Foundations | Load-bearing piles for buildings and structures in competent soil conditions [citation:1, citation:2, citation:8] | Economical for large-diameter piling; good weldability |
| Bridge Components | Structural members, supports, pedestrian bridges | Reliable mechanical properties; good formability |
| Mechanical Engineering | Agricultural machinery, truck and trailer construction, cranes, special vehicles | Excellent weldability; good surface quality |
| Renewable Energy | Solar parking structures, solar trackers | Cost-effective; good formability for custom shapes |
| Infrastructure Projects | Tunnel supports, retaining walls, highway structures | Large diameter capability; long lengths reduce joints |
| Scaffolding and Formwork | Temporary construction supports | Economical; readily available |
📝 Important Considerations
Standard Version: EN 10219-1 is the current European standard for cold-formed welded structural hollow sections. The standard is widely adopted and includes requirements for CE-marking under the Construction Products Regulation (CPR) .
CE/UKCA Marking: S235JRH hollow sections can be CE-marked and UKCA-marked, fully compliant with the Construction Products Regulation (CPR EU) and UK CPR, making them suitable for construction projects in Europe and the UK .
Impact Testing Temperature: The "JR" suffix guarantees impact properties at +20°C. If your application requires guaranteed toughness at lower temperatures, select [citation:1, citation:5, citation:7]:
S275J0H: 27 J at 0°C
S275J2H: 27 J at -20°C
Weld Seam Quality: The double-sided submerged arc welding process with subsequent normalizing heat treatment ensures that the mechanical properties of the weld match those of the base material (S235JRH), enhancing overall structural stability and reliability .
International Approximations: S235JRH is roughly equivalent to:
ASTM A36 (similar yield strength, different chemistry)
GB/T 700 Q235B (Chinese standard)
JIS G3101 SS400 (Japanese standard)
DIN 17100 St37-2 (historical German equivalent)
Complete Specification: When ordering, specify [citation:2, citation:4, citation:8]:
EN 10219-1, Grade S235JRH, SAWH (spiral welded), Size (OD x WT), Length, End Finish
Standard version: [e.g., EN 10219-1:2006]
Coating requirements: [e.g., bare, varnish, hot-dip galvanized, 3LPE]
Certification: EN 10204 Type 3.1 (or Type 2.2)
📝 Summary
EN 10219-1 S235JRH Spiral Submerged Arc Welded pipes are a standard, cost-effective, and widely available choice for large-diameter structural applications under the European standard for cold-formed welded structural hollow sections [citation:1, citation:2, citation:4, citation:8]. With minimum yield strength of 235 MPa and guaranteed Charpy impact toughness of 27 J at room temperature (+20°C) , these pipes offer a reliable solution for building construction, piling foundations, bridge components, mechanical engineering, and renewable energy structures [citation:1, citation:2, citation:8, citation:10].
The EN 10219-1 standard specifically covers cold-formed welded structural hollow sections, making it the correct specification for spiral welded structural tubes. Key features include:
Cold-formed manufacturing without subsequent heat treatment [citation:1, citation:7]
Guaranteed impact toughness at room temperature (27J at +20°C) [citation:6, citation:7, citation:10]
Excellent weldability with low carbon equivalent (CEV ≤ 0.35) [citation:6, citation:10]
CE/UKCA marking available for construction products under CPR
Wide diameter range from 219mm to over 4000mm [citation:2, citation:3, citation:4]
Available in diameters from 219mm to over 4000mm with wall thicknesses to 40mm and lengths up to 70m, these pipes are produced using the cost-effective SSAW manufacturing process with double-sided submerged arc welding, ensuring reliable weld quality and uniform mechanical properties [citation:2, citation:4, citation:8].
S235JRH is the entry-level structural grade in the EN 10219 family, suitable for general structural applications in mild climates. For applications requiring guaranteed impact toughness at lower temperatures, consider upgrading to S275J0H (0°C) or S275J2H (-20°C) [citation:1, citation:5, citation:7].
When ordering, ensure you clearly indicate the complete standard with grade, manufacturing process (SAWH), required dimensions, and any coating requirements based on your specific application and environmental conditions [citation:2, citation:4, citation:8].
