EN 10219 S235JRH Steel Tube
EN 10219 is a European standard published in two parts: EN 10219-1 specifies the technical delivery conditions for cold-formed welded structural hollow sections of non-alloy and fine-grain steels, and EN 10219-2 specifies tolerances, dimensions, and sectional properties. The standard covers hollow sections in three forms - circular (CHS), square (SHS), and rectangular (RHS) - formed cold from strip or plate and welded, without subsequent heat treatment.
The grade designation S235JRH follows the European steel-naming convention:
S - structural steel
235 - minimum specified yield strength of 235 MPa (for thicknesses up to 16 mm at room temperature)
J - Charpy V-notch impact test required
R - test temperature of +20 °C (room temperature)
H - hollow section
The corresponding steel number (Werkstoff-Nr.) is 1.0039. The "R" subscript is dropped in some sources, but the grade is universally understood.
Important distinction: EN 10219 is cold-formed. The companion standard EN 10210 covers hot-finished structural hollow sections (formed hot and normalized). EN 10210 sections generally have more consistent mechanical properties through the wall thickness and better elevated-temperature performance. EN 10219 sections are typically more economical and dominate general construction use. Both standards share grade designations (S235JRH, S275J0H, S355J2H, etc.) - always specify the standard (10219 vs 10210) when ordering.
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S235JRH Chemical Composition
S235JRH is a non-alloy structural steel. Silicon is not specified by EN 10219-1 for S235JRH, while the carbon, manganese, phosphorus, sulfur, and nitrogen limits are the same as those of comparable general structural steels. The deoxidation practice is FF (fully killed with nitrogen-binding elements).
| Element | C (t ≤ 40 mm) | C (40 < t ≤ 120 mm) | Si | Mn | P | S | N |
|---|---|---|---|---|---|---|---|
| S235JRH | 0.17 max | 0.20 max | - | 1.40 max | 0.040 max | 0.040 max | 0.009 max |
The nitrogen maximum of 0.009% does not apply if the chemical composition shows a minimum total Al content of 0.020% with a minimum Al/N ratio of 2:1, or if sufficient other nitrogen-binding elements are present. The nitrogen-binding elements shall be recorded in the inspection document.
Carbon equivalent value (CEV)
The maximum permissible CEV for S235JRH per EN 10219-1 is 0.35%, calculated as:
CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
S235JRH Mechanical Properties
Tensile testing is performed in the range of 10 °C – 35 °C per EN 10002-1 (current standard: EN ISO 6892-1). Impact testing, where required, follows EN 10045-1 (current: EN ISO 148-1).
| Property | Symbol | Value | Condition |
|---|---|---|---|
| Yield strength (min) | ReH | 235 MPa | Specified thickness ≤ 16 mm |
| Yield strength (min) | ReH | 225 MPa | 16 mm < t ≤ 40 mm |
| Tensile strength | Rm | 360 – 510 MPa | All thicknesses |
| Elongation (min) | A | 24% | t ≤ 40 mm; longitudinal, proportional test piece |
| Elongation (min, thin) | A | 17% | t < 3 mm |
| Impact energy (min) | KV | 27 J | +20 °C, longitudinal |
For thicknesses > 3 mm combined with small section-shape ratios (D/T < 15 for round and (B+H)/2T < 12.5 for square and rectangular), the minimum elongation is reduced by 2 percentage points. Impact properties are verified only when option 1.3 of EN 10219-1 is specified - by default they are not individually tested.
Dimensions and Tolerances
EN 10219-2 covers the full dimensional envelope and the related sectional properties (mass per metre, cross-sectional area, second moment of area, radius of gyration, elastic and plastic section moduli). Common trade availability is summarized below.
| Form | Outside dimension range (typical) | Wall thickness (typical) |
|---|---|---|
| Circular hollow section (CHS) | 21.3 – 610 mm OD | 2 – 16 mm |
| Square hollow section (SHS) | 20×20 – 400×400 mm | 2 – 16 mm |
| Rectangular hollow section (RHS) | 20×30 – 300×500 mm | 2 – 16 mm |
Tolerances per EN 10219-2
Outside dimension: ±1% with a minimum of ±0.5 mm and a maximum of ±10 mm
Wall thickness (D ≤ 406.4 mm): for t ≤ 5 mm, ±10%; for t > 5 mm, ±0.5 mm
Wall thickness (D > 406.4 mm): ±10% with a maximum of 2 mm
Mass per length: ±6%
Out-of-roundness (CHS): included in the OD tolerance
Squareness of corners (SHS/RHS): 90° ±1°
External corner radius (SHS/RHS): 1.5T to 2.5T for t ≤ 6 mm; 2.0T to 3.0T for 6 < t ≤ 10 mm; 2.5T to 3.5T for t > 10 mm
Length tolerance is typically +50 mm / 0 mm for mill lengths, or as agreed at order acceptance. Standard mill length is 6 m or 12 m.
EN 10219 S235JRH Equivalent
| BS | ASTM | GOST | JIS | GB |
| BS EN 10219 S235JRH | ASTM A500 Grade A (repealed) | GOST 380 St3sp | JIS G 3101 SS400 | GB/T 700 Q235B |
Hydrostatic and Dimensional Testing
Each length of pipe is hydrostatically tested by the manufacturer at a pressure that produces in the pipe wall a stress of not less than 60% of the specified minimum yield strength at room temperature. The test pressure is calculated by:
P = 2St / D
where S is the fibre stress (60% of specified minimum yield strength), t is the specified wall thickness, and D is the specified outside diameter.
Applications of EN 10219 S235JRH
S235JRH is the lightest-duty grade in the EN 10219 family and is used for general structural and construction work. It is not for pressure-piping or line-pipe service. Typical applications include:
Building frames, columns, and beams in low-rise and commercial construction
Bridges and pedestrian walkways
Transmission towers, telecommunications masts, and lighting columns
Scaffolding and temporary works
Machinery frames and equipment skids
Storage racking and shelving systems
Agricultural buildings, greenhouse structures, and barn framing
Support structures for industrial plant and conveyor trusses
Fencing, barriers, and safety railings
Architectural features, balustrades, and exposed structural elements
For higher-strength structural service, the same standard also covers S275J0H, S275J2H, S355J0H, and S355J2H. For pressure piping and process service, EN 10216 (seamless) or EN 10217 (welded) are the correct European standards - not EN 10219. For oil and gas line pipe, API 5L is the global standard.
Manufacturing Process
EN 10219 S235JRH is produced by cold-forming flat strip or plate into a circular, square, or rectangular shape and then welding the edges together. The welding is typically high-frequency electric resistance or induction welding (ERW/HFI), with the weld bead trimmed flush on the outside and the inside flash controlled to a height not exceeding the values specified in EN 10219-2. The standard specifies that no heat treatment is applied after forming and welding - the mechanical properties are achieved through the cold-work strengthening of the forming operation combined with the chemistry of the parent steel.
Because the forming is done at room temperature without subsequent normalizing, EN 10219 sections generally have higher yield and tensile strength but slightly lower ductility than their EN 10210 (hot-finished, normalized) counterparts in the same grade. The corner radii of SHS and RHS are also typically smaller (tighter) for cold-formed sections.
Why choose us
GNEE supplies EN 10219 cold-formed welded structural hollow sections in grades S235JRH, S275J0H, S275J2H, S355J0H, and S355J2H, in CHS, SHS, and RHS forms. Mill Test Certificates reference EN 10219-1 and include heat analysis, tensile test, dimensional verification, and (where option 1.3 is specified) impact test results at +20 °C.
EN 10219 cold-formed welded structural hollow sections factory
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FAQ
1. What is EN 10219 S235JRH?
EN 10219 S235JRH is a European grade of cold-formed welded structural hollow section (CHS, SHS, RHS) made of non-alloy and fine-grain steels. The designation breaks down as: S = structural steel, 235 = 235 MPa minimum yield strength (t ≤ 16 mm), J = Charpy V-notch impact test required, R = test temperature +20 °C, H = hollow section. The steel number is 1.0039.
2. What is the difference between EN 10219 and EN 10210?
EN 10219 covers cold-formed welded structural hollow sections formed cold without subsequent heat treatment. EN 10210 covers hot-finished structural hollow sections formed hot and normalized. EN 10210 sections have more uniform mechanical properties through the wall thickness and better elevated-temperature performance; EN 10219 sections are typically more economical. Grade designations are shared (S235JRH, S355J2H, etc.) - always specify the standard number.
3. What is the chemical composition of EN 10219 S235JRH?
Per EN 10219-1 (heat analysis): C 0.17 max, Si not specified (-), Mn 1.40 max, P 0.040 max, S 0.040 max, N 0.009 max. Deoxidation: FF (fully killed). Maximum CEV is 0.35%.
4. What are the mechanical properties of EN 10219 S235JRH?
Yield strength ≥235 MPa for t ≤ 16 mm and ≥225 MPa for 16 mm < t ≤ 40 mm. Tensile strength 360–510 MPa. Elongation ≥24% (t ≤ 40 mm). Impact energy ≥27 J at +20 °C. For t < 3 mm, minimum elongation is 17%.
5. Is EN 10219 S235JRH cold-formed or hot-finished?
Cold-formed. EN 10219 specifically covers sections formed cold without subsequent heat treatment. Strip or plate is shaped at room temperature and welded (typically by high-frequency ERW/HFI). Hot-finished sections fall under EN 10210.
6. What forms and dimensions are available for S235JRH?
CHS from approximately 21.3 to 610 mm OD, SHS from 20×20 to 400×400 mm, and RHS from 20×30 to 300×500 mm, with wall thickness typically 2 to 16 mm. Tolerances per EN 10219-2: outside dimension ±1% (min ±0.5 mm, max ±10 mm); wall thickness ±10% (t ≤ 5 mm, D ≤ 406.4 mm) or ±0.5 mm (t > 5 mm); mass per length ±6%.
7. What is S235JRH used for?
General structural applications: building frames, columns, beams, bridges, transmission towers, scaffolding, machinery frames, storage racking, agricultural and greenhouse structures, fencing and railings. It is not used for pressure piping, oil and gas line pipe, or boiler service - for those applications EN 10216 / EN 10217 / API 5L / ASME standards apply.
8. Is EN 10219 S235JRH a spiral welded pipe?
No. EN 10219 S235JRH is a cold-formed welded structural hollow section, typically produced by high-frequency ERW/HFI welding of straight strip into CHS, SHS, or RHS shapes. The seam is longitudinal (straight), not helical. Spiral submerged-arc-welded (SSAW) pipe is a separate product family used for large-diameter line pipe under API 5L, SY/T 5037, or AWWA C200.
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