EN10219 S460NH SHS/RSH Pipe
EN 10219 S460NH SHS/RHS Pipe – Cold-Formed Fine Grain Structural Hollow Section
Technical data for EN 10219 S460NH cold-formed welded structural hollow sections (SHS/RHS/CHS) with minimum 460 MPa yield, excellent low-temperature toughness, and superior weldability. Ideal for bridges, cranes, and offshore structures.
Cold-forming, electric resistance welding (ERW) or submerged arc welding (SAW) followed by normalizing or normalizing rolling; suitable for subsequent hot-dip galvanizing, cold bending, and machining.
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EN10219 S460NH SHS/RSH Pipe Introduction
S460NH is a cold-formed, welded structural hollow section steel grade defined in EN 10219-1. It belongs to the fine-grain structural steel class, delivering a minimum yield strength of 460 MPa for wall thicknesses up to 16 mm. Produced through cold-forming and welding followed by normalizing or normalizing rolling, S460NH offers a fine-grained microstructure that guarantees both high strength and exceptional notch toughness down to -50 °C. The grade is supplied in round (CHS), square (SHS), and rectangular (RHS) hollow profiles. Key advantages include:
- High strength-to-weight ratio for lightweight yet robust structures.
- Reliable ductility and impact resistance for seismic and dynamic loads.
- Excellent weldability, enabling safe on-site assembly without preheating (low CEV).
- Full compliance with CE marking and the Construction Products Regulation (CPR).
EN10219 S460NH SHS/RSH Pipe Chemical Composition
The chemical composition of S460NH is designed to ensure fine-grain microalloying and low impurity levels. Niobium, vanadium, and titanium serve as grain-refiners while maintaining a low carbon equivalent value (CEV) for outstanding weldability. Aluminum is added as a deoxidizing agent and to guarantee fine-grain stability. Residual elements such as copper, chromium, nickel, and molybdenum are carefully limited.
| Element | Content (max or range, wt.%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.20 | Ladle analysis |
| Silicon (Si) | ≤ 0.60 | Deoxidizer, strength contributor |
| Manganese (Mn) | 1.00 – 1.70 | Solid solution strengthener |
| Phosphorus (P) | ≤ 0.030 | Max for superior toughness |
| Sulfur (S) | ≤ 0.025 | Max for improved ductility |
| Aluminium (Al) total | ≥ 0.020 | Fine-grain structure stabilizer |
| Niobium (Nb) | ≤ 0.05 | Grain refiner / microalloy |
| Vanadium (V) | ≤ 0.12 | Precipitation strengthening |
| Titanium (Ti) | ≤ 0.05 | Grain growth control |
| Nitrogen (N) | ≤ 0.025 | Max to avoid strain aging |
| Copper (Cu) | ≤ 0.55 | Residual element |
| Chromium (Cr) | ≤ 0.30 | Residual, may increase CEV |
| Nickel (Ni) | ≤ 0.30 | Residual |
| Molybdenum (Mo) | ≤ 0.10 | Residual |
| CEV (t ≤ 16 mm) | ≤ 0.48 | CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
| CEV (16 < t ≤ 40 mm) | ≤ 0.50 | Carbon equivalent value |
| CEV (40 < t ≤ 65 mm) | ≤ 0.52 | Maximum CEV |
EN10219 S460NH SHS/RSH Pipe Thermal, Electrical and Physical Properties
These properties are not enforced by EN 10219 but are representative of S460NH in its final normalized condition. They are useful for structural fire design, thermal expansion calculations, and electrical conductivity assessments. The values may vary slightly depending on the actual chemical composition and manufacturing route.
| Property | Typical value | Unit | Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of elasticity (E) | 210 | GPa | Longitudinal, static loading |
| Shear modulus (G) | ≈ 81 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.3 | — | Within elastic range |
| Thermal expansion coefficient (α) | 12.0 (10⁻⁶/K) | K⁻¹ | Between 20 °C and 100 °C |
| Thermal conductivity (λ) | ≈ 45 | W/(m·K) | At 20 °C, typical for C-Mn steel |
| Specific heat capacity (cₚ) | ≈ 460 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρₑ) | ≈ 0.22 | µΩ·m | At 20 °C |
EN10219 S460NH SHS/RSH Pipe Mechanical Properties
The mechanical properties are verified by transverse tensile tests and Charpy V-notch impact tests on the finished hollow section. Values vary with wall thickness. For wall thicknesses exceeding 65 mm up to 120 mm, the properties must be agreed upon at the time of enquiry and order. The bend test is performed with a bend angle of 180°; the mandrel diameter depends on the yield strength class and the wall thickness.
- ReH: Upper yield strength (or Rp0.2 for thicknesses where yield point not appear).
- Rm: Tensile strength.
- A: Elongation after fracture on a gauge length 5.65√S₀ (L₀ = 5.65√S₀).
- KV: Impact energy (V-notch) tested at -50 °C (longitudinal direction).
| Property | Value (min unless noted) | Unit | Test condition / Remarks |
|---|---|---|---|
| Yield strength ReH | 460 | MPa | Wall thickness t ≤ 16 mm |
| Yield strength ReH | 440 | MPa | 16 mm < t ≤ 40 mm |
| Yield strength ReH | 420 | MPa | 40 mm < t ≤ 65 mm |
| Tensile strength Rm | 560 – 730 | MPa | t ≤ 40 mm |
| Tensile strength Rm | 530 – 730 | MPa | 40 mm < t ≤ 65 mm |
| Elongation A (L₀ = 5.65√S₀) | 17 | % | t ≤ 40 mm, transverse specimen |
| Elongation A (L₀ = 5.65√S₀) | 15 | % | 40 mm < t ≤ 65 mm, transverse |
| Impact energy KV, -50 °C | 27 | J | Longitudinal direction (av. of 3 tests, single min 19 J) |
| Bend test (180°) | d = 3t | — | t ≤ 16 mm (mandrel diameter : wall thickness ratio) |
| Bend test (180°) | d = 4t | — | 16 mm < t ≤ 40 mm |
| Bend test (180°) | d = 5t | — | 40 mm < t ≤ 65 mm |
EN10219 S460NH SHS/RSH Pipe Complete Equivalents – Identical Standard and Grade Substitutions
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| EU / EEA | EN 10219-1 | S460NH | Origin standard – cold-formed welded hollow sections |
| International | ISO 10799-2 | S460NH | Technically identical with EN 10219 |
| United Kingdom | BS EN 10219-1 | S460NH | Adopted European standard after Brexit |
| Germany | DIN EN 10219-1 | S460NH | German adoption of EN standard |
| France | NF EN 10219-1 | S460NH | French adoption |
| Italy | UNI EN 10219-1 | S460NH | Italian adoption |
| Spain | UNE-EN 10219-1 | S460NH | Spanish adoption |
| Sweden | SS-EN 10219-1 | S460NH | Swedish adoption |
| Austria | ÖNORM EN 10219-1 | S460NH | Austrian adoption |
| Finland | SFS-EN 10219-1 | S460NH | Finnish adoption |
| Netherlands | NEN-EN 10219-1 | S460NH | Dutch adoption |
| Poland | PN-EN 10219-1 | S460NH | Polish adoption |
| Czech Republic | ČSN EN 10219-1 | S460NH | Czech adoption |
| Turkey | TS EN 10219-1 | S460NH | Turkish adoption |
EN10219 S460NH SHS/RSH Pipe Application Introduction
EN 10219 S460NH hollow sections combine high strength with excellent low-temperature toughness, making them suitable for demanding structural applications where weight savings, fast erection, and long-term durability are essential. The cold-formed profile with a fine-grain microstructure ensures both high buckling resistance and excellent energy absorption. The hollow geometry itself provides superior resistance to torsion, bending in all directions, and aesthetics for architectural exposed structures.
Product Applications: Primary structural frames for warehouses, arenas, and hangars, Trusses and space frames for long-span roofs and stadiums, Columns, bracings, and wind posts in multi-storey steel buildings, Piles and pile caps for deep foundation works, Crane booms and lattice-boom sections for mobile and tower cranes, Pedestrian, cyclist, and equestrian bridges, Offshore module support frames and living quarter structural members, Solar tracker support structures and wind turbine tower internal platforms
Processed into products: Welded node connections (gusset plates, stiffeners) in tubular trusses, Bolted flange-plate connections for demountable or site-bolted assemblies, End-cap and base-plate assemblies for columns and braces, Hollow-section purlins and girts in industrial buildings, Adjustable telescopic booms and sliding profiles (using two nesting hollow sections), Curved architectural elements (using cold-bending or induction bending), Embedded column-to-foundation connections with anchor bolts and end plates, Lifting lugs and pad-eyes integrated onto hollow section members, Fatigue-critical joints in crane runways and dynamic structures
Application industries: Civil engineering and infrastructure (bridges, footbridges, viaducts), High-rise commercial and residential building construction, Industrial structures (crane girders, heavy machinery frames, platforms), Offshore and marine (flare booms, helidecks, service structures), Agricultural equipment (greenhouse frames, irrigation booms, stable frames), Transmission and telecommunication towers, Transportation (bus shelters, signage gantries, crash barriers)
EN10219 S460NH SHS/RSH Pipe Similar / Alternative Materials with Comparable Performance
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| EU | EN 10210-1 | S460NH | Hot-finished hollow section; strength identical, but tighter dimensional tolerances and potentially higher toughness. |
| USA | ASTM A1085 / A1085M | Grade 60 (Rectangular/Square) | Yield 345 MPa min; lower strength, but similar stiffness and improved ductility; suitable for structures requiring higher seismic ductility. |
| USA | ASTM A618 / A618M | Grade III | Hot-formed seamless or welded; yield 345 MPa min; good toughness; used in bridges, but lower strength class. |
| Japan | JIS G 3466 | STKR490 | Yield around 325 MPa; a cold-formed hollow section with lower strength but similar fabrication characteristics. |
| China | GB/T 3091-2015 | Q460NH | Welded steel pipe for structural purposes; high strength, but fine-grain and low-temperature toughness may differ; CEV may be slightly higher. |
| International | ISO 630-3 | S460N (open sections) | Structural steel plate and sections; same strength class but not a hollow profile; useful for built-up box columns or hybrid design. |
Notes:
Fabrication and welding notes: S460NH offers excellent weldability with a maximum CEV of 0.48–0.52 depending on thickness. Low hydrogen welding consumables should be used; preheating is generally not required for thicknesses below 40 mm at ambient temperature. The steel is suitable for hot-dip galvanizing (EN ISO 1461). Galvanizing may affect mechanical properties if the silicon content is close to the upper limit; double-check the Si level prior to galvanizing to avoid excessive coating thickness. Inspection and testing: The hollow section is tested ultrasonically for the weld seam (100 % for CHS, SHS, RHS when specified). Dimensional tolerances conform to EN 10219-2. Supplementary testing options (Z-test, elevated temperature properties, through-thickness properties) available on request.
Environmental resistance: This grade is not intended for corrosive environments without protective coating. For use in marine splash zones or atmospheres with high chloride content, a suitable corrosion protection system must be applied.
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