S460NLH SSAW Pipe
S460NLH SSAW Pipe: High-Strength Fine-Grain Steel for Arctic Structures
Comprehensive material data for S460NLH spiral submerged arc welded (SSAW) pipe according to EN 10219-1. Includes chemical composition, mechanical properties, thermal and electrical physical properties, equivalent grades, similar materials, and application guidance for structural engineering in low-temperature environments.
Cold forming, welding (SAW, SMAW, GMAW), hot-dip galvanizing, machining, cutting
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S460NLH SSAW Pipe Introduction
S460NLH is a normalized/normalized-rolled weldable fine-grain structural steel grade specified in EN 10219-1 for cold-formed welded structural hollow sections. The designation 'S' indicates structural steel, '460' denotes the minimum yield strength in MPa for thicknesses ≤16 mm, 'N' refers to normalized or normalized-rolled delivery condition, 'L' qualifies the steel for low-temperature applications with guaranteed impact energy of 27 J at -50°C. Manufactured as a spiral submerged arc welded (SSAW) pipe, S460NLH offers high strength, excellent weldability, and outstanding notch toughness at sub-zero temperatures, making it ideal for offshore structures, bridges, heavy machinery, and arctic infrastructure. It possesses fine-grained microstructure with controlled aluminum, niobium, vanadium, and titanium additions to achieve superior mechanical properties and resistance to brittle fracture.
S460NLH SSAW Pipe Chemical Composition
The table presents the chemical requirements for S460NLH as per EN 10219-1. Fine-grain elements such as niobium, vanadium and titanium are added singly or in combination. The aluminum content shall be at least 0.015% for fully killed steel. Phosphorus and sulfur are kept low to ensure toughness and weldability. Carbon Equivalent Value (CEV) typically ≤ 0.53 for thicknesses ≤ 40 mm to guarantee good weldability.
| Element | Standard Value (max, unless range) | Remarks |
|---|---|---|
| Carbon (C) | 0.20 | max |
| Silicon (Si) | 0.60 | max |
| Manganese (Mn) | 1.00 – 1.70 | range |
| Phosphorus (P) | 0.025 | max |
| Sulfur (S) | 0.020 | max |
| Chromium (Cr) | 0.30 | max |
| Nickel (Ni) | 0.80 | max |
| Molybdenum (Mo) | 0.10 | max |
| Copper (Cu) | 0.55 | max |
| Niobium (Nb) | 0.05 | max |
| Vanadium (V) | 0.20 | max |
| Titanium (Ti) | 0.05 | max |
| Aluminium (Al) | ≥ 0.015 | minimum (total Al) |
| Nitrogen (N) | 0.025 | max |
S460NLH SSAW Pipe Thermal and Electrical Physical Properties
Typical thermal and electrical physical properties for S460NLH at room temperature (20°C) based on carbon-manganese fine-grain steels. Actual values may vary slightly depending on exact composition and heat treatment. These values are suitable for engineering design calculations.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | at 20°C |
| Modulus of Elasticity (E) | 210 | GPa | at 20°C |
| Shear Modulus (G) | approx. 80 | GPa | at 20°C |
| Poisson's Ratio (ν) | 0.3 | – | at 20°C |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20°C – 100°C |
| Thermal Expansion Coefficient (α) | 12.5 | 10⁻⁶/K | 20°C – 200°C |
| Thermal Expansion Coefficient (α) | 13.3 | 10⁻⁶/K | 20°C – 300°C |
| Thermal Conductivity (λ) | 50 | W/m·K | at 20°C |
| Specific Heat Capacity (c) | 460 | J/kg·K | at 20°C |
| Electrical Resistivity (ρₑ) | 0.25 | μΩ·m | at 20°C |
S460NLH SSAW Pipe Mechanical Properties
The mechanical properties apply to the finished product in the normalized (+N) condition and are valid for the wall thickness ranges indicated. Impact test values correspond to longitudinal Charpy V-notch specimens at -50°C. The minimum elongation is measured on a gauge length of 5.65√S₀ (L₀ = 5.65√S₀). Values meet or exceed EN 10219-1 requirements.
| Property | Standard Requirement | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield Strength (ReH) | min 460 | MPa | t ≤ 16 mm |
| Yield Strength (ReH) | min 440 | MPa | 16 mm < t ≤ 40 mm |
| Yield Strength (ReH) | min 410 | MPa | 40 mm < t ≤ 63 mm |
| Yield Strength (ReH) | min 390 | MPa | 63 mm < t ≤ 80 mm |
| Yield Strength (ReH) | min 380 | MPa | 80 mm < t ≤ 100 mm |
| Tensile Strength (Rm) | 540 – 720 | MPa | t ≤ 40 mm |
| Tensile Strength (Rm) | 530 – 710 | MPa | 40 mm < t ≤ 80 mm |
| Tensile Strength (Rm) | 510 – 690 | MPa | 80 mm < t ≤ 100 mm |
| Elongation (A) | min 17 | % | Longitudinal, t ≤ 40 mm |
| Elongation (A) | min 16 | % | Longitudinal, 40 mm < t ≤ 80 mm |
| Elongation (A) | min 15 | % | Longitudinal, 80 mm < t ≤ 100 mm |
| Impact Energy (KV2) | min 27 | J | -50°C, longitudinal |
S460NLH SSAW Pipe Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10219-1 | S460NLH | Original standard for cold-formed welded hollow sections |
| International | ISO 630-3 | S460NL | Equivalent thickness ranges up to 100 mm; impact at -50°C |
S460NLH SSAW Pipe Application Introduction
S460NLH SSAW pipes are designed for demanding structural applications where high strength combined with reliable low-temperature notch toughness is essential. The spiral welded pipe format offers economic advantages for large-diameter pipes and long lengths. Typical uses include heavy welded structures, offshore wind towers, bridge piers, and piling in cold climates. The steel can be fabricated using all common welding processes, and preheating may be required depending on thickness and joint restraint.
Product Applications: Spiral welded tubular piles and foundation pipes, Offshore jacket structures and monopiles, Bridge tubular arches and piers, Wind tower tubular sections, Heavy-duty crane booms and conveyor galleries, Liquid/gas transmission pipe in structural applications
Processed into products: Tubular columns and truss chords in buildings, Large-diameter pipe piles for deep foundations, Can sections for cylindrical towers, Main legs of jack-up rigs and offshore platforms, Structural members for roller coasters and grandstands, Piping systems subject to structural loads at low temperatures
Application industries: Offshore engineering and shipbuilding, Civil construction (bridges, high-rise buildings, stadiums), Renewable energy (wind turbine towers, hydro-power penstocks), Mining and heavy machinery, Arctic infrastructure and ice-class structures, Marine and port facilities (piles, dolphins)
S460NLH SSAW Pipe Similar/Comparable Grades for Possible Substitution
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-3 | S460NL | For hot-rolled plates; identical chemical & mechanical base; impact at -50°C |
| European Union | EN 10219-1 | S460ML | Thermomechanical rolled, -50°C impact, similar strength but different delivery condition |
| European Union | EN 10219-1 | S460QL | Quenched & tempered, -50°C impact, higher tensile strength range |
| USA | ASTM A709 / A709M | HPS 70W / Gr. 70W | Weathering steel, 485 MPa yield, CVN at -34°C or -51°C depending on zone, not identical |
| USA | ASTM A913 / A913M | Grade 65 (450) | Similar yield (450 MPa), low-temperature toughness available, normalized option |
| Japan | JIS G 3106 | SM570 | 570 N/mm² tensile, no guaranteed -50°C impact, typically for moderate temperatures |
Notes:
Weldability: S460NLH possesses a low carbon equivalent, ensuring good weldability without excessive preheating. Preheating temperatures according to EN 1011-2 should be considered for thicknesses above 30 mm.
Corrosion protection: As an unalloyed steel, S460NLH requires surface protection such as painting or hot-dip galvanizing for long-term durability in aggressive environments.
Dimensional tolerances: Conform to EN 10219-2 for SSAW pipes.
Certification: Typical mill certificates include EN 10204 Type 3.1 or 3.2 examinations.
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