EN10219 S420MH LSAW Pipe
EN10219 S420MH LSAW Pipe: High-Strength Cold-Formed Welded Hollow Section for Structural Applications
Comprehensive material data for EN10219 S420MH LSAW pipe: chemical composition, mechanical properties, thermal and electrical properties, international equivalent grades, and application guidance.
Thermomechanical rolling, cold forming, longitudinal submerged arc welding (LSAW), post-weld heat treatment if required, cutting, machining
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EN10219 S420MH LSAW Pipe Introduction
EN10219 S420MH is a high-strength fine-grain structural steel grade intended for cold-formed welded hollow sections, manufactured by longitudinal submerged arc welding (LSAW). It is supplied in the thermomechanically rolled (+M) condition, ensuring a minimum yield strength of 420 MPa and reliable notch toughness down to -20 °C. The low carbon content and microalloying with elements such as niobium, vanadium, and titanium refine the grain structure, which enhances strength and weldability. This grade meets the requirements of EN 10219-1, making it suitable for demanding load-bearing structures in construction, offshore engineering, bridges, and heavy machinery. Typical products include round, square, and rectangular hollow sections, available in LSAW pipes up to large diameters. The combination of high strength, good ductility, and consistent quality ensures safe and efficient design in both static and dynamic loading scenarios.
EN10219 S420MH LSAW Pipe Chemical Composition
The chemical composition of S420MH is controlled to achieve fine grain structure and high strength after thermomechanical rolling. Maximum values are specified except for aluminum, which has a minimum requirement. The carbon equivalent (CEV) is limited to ensure good weldability. Elements not listed are allowed within usual residual levels unless otherwise agreed.
| Element | Standard Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.16 | |
| Silicon (Si) | ≤0.50 | |
| Manganese (Mn) | ≤1.70 | |
| Phosphorus (P) | ≤0.030 | |
| Sulfur (S) | ≤0.025 | |
| Niobium (Nb) | ≤0.05 | |
| Vanadium (V) | ≤0.12 | |
| Titanium (Ti) | ≤0.05 | |
| Aluminum (Al total) | ≥0.020 | Total Al, minimum |
| Nitrogen (N) | ≤0.020 | |
| Carbon equivalent (CEV) | ≤0.43 (t ≤16 mm); ≤0.45 (16 < t ≤40 mm) | CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
EN10219 S420MH LSAW Pipe Thermal and Electrical Physical Properties
The following values are typical for carbon-manganese structural steels and can be used for design calculations. They are not part of the mandatory delivery conditions of EN 10219-1 but provide engineering reference for S420MH. Variations may occur with temperature and actual heat treatment condition.
| 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) | ≈81 | GPa | Calculated from E and ν |
| Poisson ratio (ν) | 0.3 | — | Typical |
| Thermal expansion coefficient (α) | 12.0 (20 – 100 °C); 13.2 (100 – 200 °C) | 10⁻⁶/K | Mean coefficient |
| Thermal conductivity (λ) | 50 | W/(m·K) | At 20 °C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρe) | 0.16 – 0.20 | 10⁻⁶ Ω·m | At 20 °C |
EN10219 S420MH LSAW Pipe Mechanical Properties
The mechanical properties are based on the requirements of EN 10219-1 for longitudinal specimens taken from the finished hollow section. The yield strength and tensile values depend on the wall thickness. Impact energy is verified at -20 °C, which corresponds to the M (thermomechanical) delivery condition. The bend test confirms adequate cold formability.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥420 (t ≤16 mm); ≥400 (16 < t ≤40 mm) | MPa | Longitudinal specimen, room temperature |
| Tensile strength (Rm) | 500 – 680 | MPa | Longitudinal specimen, room temperature |
| Elongation after fracture (A) | ≥19 (t ≤12.5 mm, L₀=5.65√S₀); ≥19 (t >12.5 mm, L₀=200 mm) | % | Longitudinal, gauge length as indicated |
| Impact energy (KV) | ≥27 J at -20 °C | J | Charpy V-notch, longitudinal, 10×10 mm |
| Bend test (mandrel diameter) | 2t (t ≤16 mm); 3t (16 < t ≤40 mm) | — | Bend angle 180°, specimen width ≥50 mm |
EN10219 S420MH LSAW Pipe Directly Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10219-1 | S420MH | Cold-formed welded hollow sections, base specification |
| International | ISO 10799-2 | S420MH | Structural steel hollow sections, equivalent adoption |
| Germany | DIN EN 10219 | S420MH | Identical to EN 10219 |
| UK | BS EN 10219 | S420MH | British adoption of EN standard |
| France | NF EN 10219 | S420MH | French adoption of EN standard |
EN10219 S420MH LSAW Pipe Application Introduction
S420MH LSAW pipe combines high strength, good low-temperature toughness, and excellent weldability, making it a reliable choice for a wide range of structural and engineering projects. Its delivery condition supports economic fabrication and erection without subsequent heat treatment. Typical applications include primary load-bearing members, heavy framing, and foundation structures where weight savings and robustness are critical.
Product Applications: LSAW pipes for structural columns and piles, Welded hollow sections for trusses and space frames, Piling pipes for deep foundations, Tower sections for wind turbines, Crane and lifting equipment booms, Bridge girders and gantry frames
Processed into products: Welded box columns and beam-columns, Tubular truss joints and K-joints, Offshore platform legs and bracing, Spiral staircases and pedestrian bridges, Conveyor galleries and pipe supports, Sign masts and high-mast lighting poles
Application industries: Construction and building (high-rise, stadiums, industrial halls), Offshore and marine engineering (platforms, jackets, shipbuilding), Bridge engineering (trusses, arches, piers), Heavy machinery and equipment (cranes, excavators, mining equipment), Wind energy and power transmission (turbine towers, lattice towers, monopoles), Transportation and infrastructure (railway bridges, sign structures, piles)
EN10219 S420MH LSAW Pipe Similar or Alternative Material Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-4 | S420M | Plate/coil for welded structures; identical yield class, impact 27 J at -20 °C, typical precursor for hollow sections |
| Europe | EN 10210-1 | S420MH | Hot-finished hollow sections; similar mechanical properties, different manufacturing route, may replace in some applications |
| Europe | EN 10219-1 | S460MH | Higher strength alternative (≥460 MPa yield) for weight reduction; same delivery condition and toughness |
| USA | ASTM A572/A572M | Grade 60 [415] | High-strength low-alloy structural steel, yield 415 MPa; suitable substitute for plates and shapes, but not a direct hollow section grade |
| USA | ASTM A500/A500M | Grade C | Cold-formed welded structural tubing, yield 345 MPa; lower strength but widely available hollow section grade with similar formability |
| Japan | JIS G 3444 | STK 500 | Carbon steel tube for general structural purposes, min tensile 500 MPa, comparable application range |
Notes:
Material supplied to EN 10219-1 must meet stringent requirements for dimensional tolerances, surface condition, and non-destructive testing if specified. Welding shall follow established procedures with low-hydrogen consumables; preheating and interpass temperature control may be required depending on the carbon equivalent and section thickness. For fatigue-loaded joints, reference is made to EN 1993-1-9. The steel is fully recyclable and compatible with standard corrosion protection systems (painting, galvanizing). When ordering LSAW pipe, the minimum and maximum dimensions, weld seam preparation, and any supplementary testing should be clearly agreed at the time of enquiry.
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