EN10219 S420MH ERW Pipe
EN10219 S420MH ERW Pipe: High-Strength Cold-Formed Hollow Section Steel
Detailed material data for EN10219 S420MH ERW pipe, including chemical composition, mechanical properties, physical properties, equivalent grades, and application guide.
Cold forming, welding (ERW), hot-dip galvanizing, cutting, drilling, machining
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EN10219 S420MH ERW Pipe Introduction
EN10219 S420MH is a thermomechanically rolled, fine-grain structural steel intended for cold-formed welded hollow sections. It is supplied as an ERW (Electric Resistance Welded) pipe with a minimum yield strength of 420 MPa and excellent toughness down to -20 °C. This grade combines high strength with good weldability and formability, making it ideal for weight-optimized, dynamically loaded structures. Its fine-grained microstructure ensures reliable performance in demanding applications such as buildings, bridges, offshore structures, and heavy machinery.
EN10219 S420MH ERW Pipe Chemical Composition
Typical ladle analysis according to EN 10219-1 for grade S420MH. Values are maximum unless a range is stated. The steel is fully killed and fine-grained with microalloyed elements (Nb, V, Ti) ensuring high strength and toughness.
- CEV max: 0.39 (for t ≤ 16 mm)
- Nitrogen is bound by Al and suitable nitrides
| Element | Standard Value (%) | Remarks |
|---|---|---|
| Carbon (C) | 0.12 max | |
| Silicon (Si) | 0.50 max | |
| Manganese (Mn) | 1.60 max | |
| Phosphorus (P) | 0.025 max | |
| Sulfur (S) | 0.020 max | |
| Aluminum (Al_total) | 0.020 min | Acid-soluble aluminum |
| Niobium (Nb) | 0.05 max | |
| Vanadium (V) | 0.10 max | |
| Titanium (Ti) | 0.05 max | |
| Nickel (Ni) | 0.30 max | |
| Chromium (Cr) | 0.30 max | |
| Molybdenum (Mo) | 0.10 max | |
| Copper (Cu) | 0.35 max | |
| Nitrogen (N) | 0.020 max |
EN10219 S420MH ERW Pipe Thermal and Electrical Physical Properties
Typical physical properties for low-alloy structural steel similar to S420MH. These values are not part of the EN 10219 delivery requirement but are commonly used for design calculations. Properties can vary slightly depending on exact chemical composition and microstructure.
- Values apply at room temperature unless otherwise noted.
- Thermal expansion refers to the linear coefficient between 20 °C and 100 °C.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Elastic modulus (E) | 210 | GPa | At 20 °C |
| Shear modulus (G) | 81 | GPa | At 20 °C |
| Poisson's ratio (ν) | 0.3 | - | At 20 °C |
| Thermal expansion coefficient (α) | 11.1 x 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal conductivity (λ) | 48 | W/(m·K) | At 20 °C |
| Specific heat capacity (c) | 486 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρ_e) | 0.18 | Ω·mm²/m | At 20 °C |
EN10219 S420MH ERW Pipe Mechanical Properties
Mechanical properties for S420MH hollow sections according to EN 10219-1. Testing is performed on the base material of the finished product. Tensile test specimens are taken from longitudinal (or transverse) direction. Impact test temperature -20 °C, using Charpy V-notch specimens.
- Yield strength values vary with wall thickness.
- Elongation measured on a gauge length of 5.65√S0 (A5).
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | 420 min | MPa | Thickness ≤ 16 mm |
| Yield strength (ReH) | 400 min | MPa | 16 mm < Thickness ≤ 40 mm |
| Yield strength (ReH) | 380 min | MPa | 40 mm < Thickness ≤ 65 mm |
| Tensile strength (Rm) | 520 – 680 | MPa | All thicknesses |
| Elongation (A) | 19 min | % | Longitudinal, thickness ≤ 40 mm |
| Elongation (A) | 18 min | % | Longitudinal, 40 mm < thickness ≤ 65 mm |
| Impact energy (KV2) | 40 min (average) | J | At -20 °C, longitudinal |
| Bend test | No requirement in basic specification; additional agreement may apply | - | - |
EN10219 S420MH ERW Pipe Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10219-1 | S420MH | Original designation for cold-formed welded hollow sections |
| International | ISO 630-2 | S420M (flat products only) | Similar chemical/mechanical requirements but for hot-rolled plates, not hollow sections |
EN10219 S420MH ERW Pipe Application Introduction
S420MH ERW tubes are particularly suited for weight-critical and dynamically loaded structures where high strength, good cold formability, and reliable low-temperature toughness are required. They can be used directly in the as-welded condition or after protective coatings such as hot-dip galvanizing. Typical processing includes cutting, welding, bolting, and light machining. The grade is often selected for projects combining architectural visibility and structural safety.
Product Applications: Structural frames for high-rise buildings, Trusses and space frames, Bridge piers and abutments, Offshore platform braces and columns, Mobile crane telescopic booms, Trailer chassis and heavy-duty racks, Wind turbine tower internals
Processed into products: Square/rectangular hollow section (SHS/RHS) columns and beams, Circular hollow section (CHS) tubes for truss chords, Welded joints and node connectors, Base plates and end caps, Gusset plates and stiffeners, Lifting lugs and brackets, Guardrails and handrails
Application industries: Construction and civil engineering, Bridge building, Offshore and marine structures, Crane and lifting equipment, Agricultural machinery, Transport and logistics systems, Wind energy towers and foundations
EN10219 S420MH ERW Pipe Near Equivalent / Similar Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10219-1 | S355J2H | Lower strength (355 MPa), same toughness; suitable when strength demands are lower and weldability is critical |
| Europe | EN 10025-4 | S420M | Hot-rolled plate with similar chemistry and strength; used when forming into sections is required |
| China | GB/T 1591-2018 | Q420D | Yield strength 420 MPa, impact at -20 °C; available as plates, sheets, and some sections |
| USA | ASTM A572 / A572M | Grade 60 (Type 1 or 2) | 415 MPa yield, similar structural applications; note compositional differences (e.g., higher Mn) |
| USA | ASTM A500 / A500M | Grade C | Yield strength 345 MPa; lower strength but widely used in cold-formed hollow sections |
| Japan | JIS G 3114 | SM490B / SMA490AW | Weather resistant structural steel with minimum yield ~325–365 MPa; not directly equal, but used in similar contexts |
| API | API Spec 5L | X60 (L415) | Pipeline steel with 415 MPa yield; may be considered for some structural tubes if toughness and weldability match |
Notes:
- All mechanical properties are based on the base material after forming unless otherwise agreed. For ERW pipes, the weld zone efficiency is considered adequate; however, special weld inspection may be specified.
- The CEV limit applies for weldability classification. For thicknesses > 16 mm, slightly higher CEV may be permitted; consult EN 10219-1 for details.
- Improved atmospheric corrosion resistance can be achieved through hot-dip galvanizing or painting; the steel itself is not inherently atmospheric-corrosion resistant.
- Optional supplementary testing (e.g., ultrasonic testing, through-thickness tensile) may be agreed upon at the time of order.
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