EN10219 S460NH SSAW Pipe
EN10219 S460NH SSAW Pipe - High-Strength Fine-Grain Steel Hollow Section for Structural Applications
Comprehensive technical data for S460NH steel according to EN 10219, covering chemical composition, mechanical properties at various thicknesses, physical properties, and international equivalent grades, with focus on SSAW (spiral submerged arc welded) pipe applications.
Cold forming and welding, suitable for subsequent hot-dip galvanizing, machining, and light fabrication
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EN10219 S460NH SSAW Pipe Introduction
S460NH is a thermomechanically rolled fine-grain structural steel for cold-formed welded hollow sections, specified in EN 10219. It offers a minimum yield strength of 460 MPa for thicknesses up to 16 mm, with guaranteed impact toughness at -50°C (NL class). The steel is microalloyed with niobium, vanadium, and titanium to achieve high strength and good weldability without the need for post-weld heat treatment in typical thickness ranges.
- Excellent strength-to-weight ratio for lightweight structures
- Superior low-temperature toughness for arctic/offshore service
- Good formability for cold bending and profiling
- Controlled CEV for reliable field welding
EN10219 S460NH SSAW Pipe Chemical Composition
Chemical composition limits according to EN 10219-1 for grade S460NH. The steel is microalloyed with Nb, V, and Ti to refine the grain size during thermomechanical rolling. Total aluminium content is controlled for fine-grain practice. Low carbon content and limited carbon equivalent (CEV) ensure good weldability and cold formability.
| Element | Maximum/Allowable Range (%) | Remarks |
|---|---|---|
| C | ≤ 0.12 | Ladle analysis |
| Si | ≤ 0.60 | Ladle analysis |
| Mn | ≤ 1.70 | Ladle analysis |
| P | ≤ 0.025 | Ladle analysis |
| S | ≤ 0.020 | Ladle analysis |
| Al (total) | ≥ 0.020 | Minimum for fine-grain practice |
| Nb | ≤ 0.05 | Microalloying element |
| V | ≤ 0.12 | Microalloying element |
| Ti | ≤ 0.05 | Microalloying element |
| Ni | ≤ 0.80 | Residual element |
| Cr | ≤ 0.30 | Residual element |
| Mo | ≤ 0.10 | Residual element |
| Cu | ≤ 0.55 | Residual element |
| N | ≤ 0.025 | Ladle analysis |
| CEV | ≤ 0.45 (t ≤ 16 mm) | Carbon equivalent: CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
EN10219 S460NH SSAW Pipe Physical and Thermal Properties
Representative physical properties for thermomechanically rolled fine-grain structural steels in the S460NH grade class. Actual values may vary slightly depending on exact composition and manufacturing process. These data are suitable for engineering calculations involving thermal expansion, heat transfer, and electric resistivity.
| Property | Typical Value | Unit | Test Condition / Reference |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Modulus of elasticity (E) | 210 | GPa | At 20°C, static loading |
| Shear modulus (G) | ≈ 81 | GPa | Derived from E and ν |
| Poisson's ratio (ν) | 0.3 | — | In the elastic range |
| Thermal expansion coefficient (α) | 11.1 | ×10⁻⁶ /K | 20°C to 100°C |
| Thermal expansion coefficient (α) | 12.5 | ×10⁻⁶ /K | 20°C to 200°C |
| Thermal conductivity (λ) | 50 | W/(m·K) | At 20°C |
| Thermal conductivity (λ) | 45 | W/(m·K) | At 100°C |
| Specific heat capacity (c) | 460 | J/(kg·K) | At 20 – 100°C |
| Electrical resistivity (ρ_e) | 0.20 – 0.25 | µΩ·m | At 20°C |
EN10219 S460NH SSAW Pipe Mechanical Properties
Minimum mechanical properties for S460NH hollow sections in accordance with EN 10219-1. Values depend on wall thickness. Tensile testing is performed in the longitudinal direction on strip/plate before forming or on the finished hollow section. Impact testing is carried out on Charpy-V specimens at -50°C with minimum energy of 27 J. Bending tests use full-section or strip specimens bent 180° around a mandrel of specified diameter without cracking.
| Property | Required Value | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield strength (ReH) | 460 (min) | MPa | t ≤ 16 mm |
| Yield strength (ReH) | 440 (min) | MPa | 16 < t ≤ 40 mm |
| Yield strength (ReH) | 430 (min) | MPa | 40 < t ≤ 63 mm |
| Yield strength (ReH) | 410 (min) | MPa | 63 < t ≤ 80 mm |
| Yield strength (ReH) | 400 (min) | MPa | 80 < t ≤ 100 mm |
| Yield strength (ReH) | 385 (min) | MPa | 100 < t ≤ 120 mm |
| Tensile strength (Rm) | 540 – 720 | MPa | t ≤ 40 mm |
| Tensile strength (Rm) | 540 – 720 | MPa | 40 < t ≤ 63 mm |
| Tensile strength (Rm) | 530 – 710 | MPa | 63 < t ≤ 100 mm |
| Tensile strength (Rm) | 510 – 690 | MPa | 100 < t ≤ 120 mm |
| Elongation (A) | 17 (min) | % | Longitudinal, gauge length 5.65√S₀, t ≤ 40 mm |
| Elongation (A) | 17 (min) | % | Longitudinal, 40 < t ≤ 63 mm |
| Elongation (A) | 16 (min) | % | Longitudinal, 63 < t ≤ 100 mm |
| Elongation (A) | 16 (min) | % | Longitudinal, 100 < t ≤ 120 mm |
| Bend test (mandrel diameter) | 2t | — | 180° bend, t ≤ 16 mm |
| Bend test (mandrel diameter) | 3t | — | 180° bend, 16 < t ≤ 40 mm |
| Bend test (mandrel diameter) | 4t | — | 180° bend, t > 40 mm |
| Impact energy (KV) | 27 (min) | J | Charpy-V, -50°C (NL), longitudinal |
EN10219 S460NH SSAW Pipe Fully Equivalent Materials and Directly Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10210-1 | S460NH | Hot-finished structural hollow sections; identical chemical composition and mechanical property requirements as EN 10219 S460NH. |
| European Union | EN 10219-1 | S460NH | Cold-formed welded hollow sections (subject standard); fully interchangeable with the hot-finished version within the limits of fabrication conditions. |
EN10219 S460NH SSAW Pipe Application Introduction
S460NH in the form of SSAW pipes is widely used where high load-bearing capacity and excellent low-temperature toughness are required. Its thermomechanical rolling and controlled CEV facilitate field welding, making it suitable for large on-site constructions.
Product Applications: SSAW (spiral submerged arc welded) steel pipes for fluid transmission and structural use, LSAW (longitudinal submerged arc welded) pipes for critical structural applications, Cold-formed welded hollow sections (square, rectangular) for columns and trusses, Tubular piling and combination walls
Processed into products: Tubular piles and pile shoes, Jacket legs and braces for offshore platforms, Wind turbine tower cans and transition pieces, Structural columns for high-rise buildings and stadiums, Penstocks and water transmission mains, Heavy-duty sign poles and lighting masts, Columns and beams in bridge construction
Application industries: Oil and gas (onshore and offshore pipelines, risers), Civil engineering and construction (structural columns, bridge piers), Marine and offshore (jacket legs, piles, platform substructures), Wind energy (tower tubular sections, foundation piles), Heavy machinery and transport equipment, Port and harbor infrastructure (dolphins, fender piles)
EN10219 S460NH SSAW Pipe Similar or Comparable Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-3 | S460NL | Normalized/normalized rolled fine-grain structural steel for flat and long products; similar strength and -50°C impact properties, but intended for open sections and plates, not hollow sections. |
| European Union | EN 10025-4 | S460ML | Thermomechanically rolled fine-grain steel; comparable mechanical values, CEV, and toughness, used in heavy plate applications. |
| USA | ASTM A572/A572M | Grade 65 | High-strength low-alloy structural steel; minimum yield 450 MPa (65 ksi) but without guaranteed low-temperature impact toughness – supplementary requirements needed to match S460NH toughness. |
| Japan | JIS G 3106 | SM570 | Rolled steel for welded structure; yield point min. 460 MPa for t≤16 mm, but impact characteristics differ (typically 0°C or -5°C); may be ordered with low-temperature specification to approach S460NH performance. |
| China | GB/T 1591 | Q460ND | High-strength low-alloy structural steel with -20°C impact requirement; higher carbon and CEV limits, less stringent toughness than S460NH, but similar strength level. |
Notes:
- Welding: low CEV allows welding without preheat in many cases; follow EN 1011-2 recommendations. Typical applicable welding processes include SAW, SMAW, and GMAW.
- Corrosion protection: can be hot-dip galvanized or coated; suitable for duplex systems in marine environments.
- Forming: cold bending radii should comply with EN 1993-1-8; the data in the mechanical table confirm good bendability.
- Inspection: ultrasonic testing of welds and base material according to EN 10246 series may be required for critical applications.
- Sustainability: high strength reduces material consumption and weight, contributing to lower carbon footprint in structures.
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