EN 10219 S460NH LSAW Pipe
EN 10219 S460NH LSAW Pipe: High-Strength Normalized Weldable Structural Steel
Comprehensive material data for S460NH steel grade according to EN 10219 standard, specifically for LSAW (Longitudinal Submerged Arc Welded) pipes. Includes chemical composition, mechanical and physical properties.
Cold forming followed by longitudinal submerged arc welding, suitable for cutting, machining, welding, and hot-dip galvanizing
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EN 10219 S460NH LSAW Pipe Introduction
S460NH is a thermomechanically normalized weldable fine-grain structural steel grade defined in EN 10219 for cold-formed welded structural hollow sections. The 'N' denotes normalized or normalized rolled delivery condition, while 'H' indicates hollow section. This grade offers a minimum yield strength of 460 MPa for thicknesses up to 16 mm, combining high strength with good toughness and excellent weldability. It is particularly suitable for LSAW (Longitudinal Submerged Arc Welded) pipe production, enabling large-diameter, thick-walled tubular structures. S460NH exhibits improved notch toughness at low temperatures down to -50°C, making it ideal for demanding structural applications including offshore platforms, bridges, and heavy machinery where weight reduction without compromising structural integrity is crucial.
EN 10219 S460NH LSAW Pipe Chemical Composition
The chemical composition of S460NH is precisely controlled to ensure the specified mechanical properties and excellent weldability. The steel is fully killed with a minimum of 0.015% acid-soluble aluminum or sufficient other nitrogen-binding elements. Fine-grain practice is mandatory, with alloying elements such as niobium, vanadium, and titanium added singly or in combination. The carbon equivalent value (CEV) is restricted to guarantee good field weldability. Based on EN 10219-1:2006 for product thicknesses relevant to LSAW pipes.
| Element | Standard Value (Max, %) | Remarks |
|---|---|---|
| Carbon (C) | 0.20 | For thickness ≤ 16 mm |
| Silicon (Si) | 0.60 | - |
| Manganese (Mn) | 1.00 to 1.70 | - |
| Phosphorus (P) | 0.030 | - |
| Sulfur (S) | 0.025 | - |
| Niobium (Nb) | 0.05 | Singly or in combination with V and Ti |
| Vanadium (V) | 0.12 | Singly or in combination with Nb and Ti |
| Titanium (Ti) | 0.05 | Singly or in combination with Nb and V |
| Aluminum (Al) | ≥ 0.015 | Acid-soluble, or sufficient other N-binding elements |
| Nitrogen (N) | 0.020 | - |
| Molybdenum (Mo) | 0.10 | Residual/optional element |
| Nickel (Ni) | 0.30 | Residual/optional element |
| Chromium (Cr) | 0.30 | Residual/optional element |
| Copper (Cu) | 0.35 | Residual/optional element |
| CEV (Carbon Equiv.) | 0.53 | For thickness ≤ 30 mm |
EN 10219 S460NH LSAW Pipe Thermal and Electrical Physical Properties
The following thermal and electrical physical properties are provided as typical reference values for low-alloy structural steels of similar composition and strength level. These values are generally applicable to S460NH at room temperature unless otherwise specified. They are critical for engineering calculations involving thermal expansion, heat transfer, and structural stiffness. Note that properties can vary slightly depending on exact composition and heat treatment.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Modulus of Elasticity (E) | 210 | GPa | At 20°C |
| Shear Modulus (G) | 81 | GPa | At 20°C, calculated |
| Poisson's Ratio (ν) | 0.3 | - | At 20°C |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | At 20°C to 100°C |
| Thermal Expansion Coefficient (α) | 12.5 | 10⁻⁶/K | At 20°C to 200°C |
| Thermal Expansion Coefficient (α) | 13.0 | 10⁻⁶/K | At 20°C to 300°C |
| Thermal Conductivity (λ) | 48 | W/(m·K) | At 20°C |
| Thermal Conductivity (λ) | 46 | W/(m·K) | At 100°C |
| Specific Heat Capacity | 460 | J/(kg·K) | At 20°C to 100°C |
| Electrical Resistivity (ρ_e) | 0.23 | Ω·mm²/m | At 20°C |
EN 10219 S460NH LSAW Pipe Mechanical Properties
The mechanical properties for S460NH LSAW pipes are guaranteed by the manufacturer through the selection of appropriate thermomechanically rolled or normalized input material and validated welding procedures. These values are specified in EN 10219-1 and represent the minimum longitudinal requirements for the finished hollow section, except for impact energy which is transverse. Properties are valid for wall thicknesses up to 65 mm, with yield strength decreasing for thicker sections.
- Yield Strength (ReH): Minimum 460 MPa for t ≤ 16 mm; 440 MPa for 16 < t ≤ 30 mm; 400 MPa for 30 < t ≤ 65 mm.
- Tensile Strength (Rm): 550 to 720 MPa for all thicknesses.
- Elongation (A): Minimum 17% longitudinal.
- Impact Energy (KV2): Minimum 40 J at -50°C (transverse).
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | 460 min | MPa | Wall thickness t ≤ 16 mm, longitudinal |
| Yield Strength (ReH) | 440 min | MPa | Wall thickness 16 < t ≤ 30 mm, longitudinal |
| Yield Strength (ReH) | 400 min | MPa | Wall thickness 30 < t ≤ 65 mm, longitudinal |
| Tensile Strength (Rm) | 550 to 720 | MPa | All thicknesses, longitudinal |
| Elongation (A) | 17 min | % | Gauge length 5.65√S₀, longitudinal |
| Impact Energy (KV₂) | 40 min | J | Test temperature -50°C, transverse |
| Bend Test | No cracks/flaws | - | 180° bend, mandrel diameter 3t (t = wall thickness) |
EN 10219 S460NH LSAW Pipe Completely Equivalent Material Standards and Replaceable Grades
It is important to note that S460NH is a grade exclusively defined for hollow sections in EN 10219. No other identical, complete equivalent exists that covers the combination of cold-formed hollow section production and normalized delivery. The following table indicates materials that can be considered as the same grade when the normative reference is identical.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10219-1 | S460NH | Identical grade within the same standard |
| Germany | DIN EN 10219-1 | S460NH | Adopted European standard without modification |
| United Kingdom | BS EN 10219-1 | S460NH | Adopted European standard without modification |
| France | NF EN 10219-1 | S460NH | Adopted European standard without modification |
| Italy | UNI EN 10219-1 | S460NH | Adopted European standard without modification |
EN 10219 S460NH LSAW Pipe Application Introduction
S460NH LSAW pipe is designed for high-load-bearing, welded structural fabrications where superior strength-to-weight ratio and notch toughness at sub-zero temperatures are required. Its normalized condition ensures homogeneous mechanical properties across the weld and base material, making it exceptionally reliable for dynamic loading.
Product Applications: LSAW (Longitudinal Submerged Arc Welded) steel pipes, Circular, square, and rectangular hollow sections, Tubular piles and foundation cans, Welded structural trusses and frame assemblies, Custom fabrications for complex load paths
Processed into products: Columns and beams in high-rise buildings, Chord and brace members in offshore jacket platforms, Main legs and bracings for jack-up rigs, Rotors and stators for tower cranes, Tubular transition pieces in wind turbine towers, Wide-span roof truss chords, Bridge arch chords and box-girder stiffeners, Boom sections for heavy-duty excavators and material handlers
Application industries: Offshore and marine engineering (jacket structures, topside modules, flare booms), Bridge construction (truss girders, arches, bridge piers), High-rise and large-span building construction (columns, trusses, space frames), Wind energy (tubular towers, transition pieces, foundation piles), Mining and material handling (conveyor frames, stacker/reclaimer booms), Heavy crane and lifting equipment (telescopic booms, crawler crane frames), Shipbuilding (deck stiffeners, crane pedestals)
EN 10219 S460NH LSAW Pipe Recommended Similar/Alternative Material Substitutes
When a direct equivalent cold-formed hollow section is not available, S460NH can potentially be substituted with higher-strength normalized or thermomechanically rolled steel grades that provide similar yield strength. However, the specific processing route (welded tube vs. open profile) must be carefully evaluated, especially regarding fatigue, toughness, and delivery condition.
| Country/Region | Standard | Grade | Remarks / Analysis |
|---|---|---|---|
| European Union | EN 10025-3 | S460N | The base material for open sections. Identical chemical and mechanical requirements, but does not cover hollow section forming and welding. |
| European Union | EN 10210-1 | S460NH | Hot-finished structural hollow sections. Slightly different manufacturing route but identical chemical and mechanical property requirements. |
| European Union | EN 10219-1 | S460MH | Thermomechanically rolled (M) hollow section counterpart. Similar strength but may have different chemical composition and CEV for better weldability. |
| International | ISO 630-3 | S460C | High-strength structural steel plates. Comparable strength level, but suitable for plate applications and not defined as a hollow section. |
Notes:
- Welding of S460NH LSAW pipes should follow standard procedures for fine-grain structural steels, with attention to heat input and pre-heating/interpass temperature control as specified in EN 1011-2.
- The specified impact toughness at -50°C (J0 designation) requires strict quality control during welding to ensure the heat-affected zone (HAZ) maintains similar properties.
- For CRA (Corrosion Resistant Alloy) clad or lined pipe applications, S460NH can serve as the backing steel (base metal) for integrating high-nickel alloy liners.
- Ultrasonic testing (UT) of the weld seam and full body is typically mandatory as per customer specification and product standard for critical applications.
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