EN 10219-1 S275MH ERW Pipe
EN 10219-1 S275MH ERW Pipe: Fine Grain Thermomechanical Structural Hollow Section
Detailed material data for S275MH grade according to EN 10219-1, used in ERW structural hollow sections, including chemical composition, mechanical properties, physical properties, and equivalents.
Cold forming and electric resistance welding (ERW), followed by sizing and finishing
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EN 10219-1 S275MH ERW Pipe Introduction
S275MH is a thermomechanically rolled fine grain structural steel hollow section grade defined in EN 10219-1. It offers a minimum yield strength of 275 MPa and excellent weldability with a low carbon equivalent (CEV ≤0.34). The TMCP process refines the grain structure, enhancing toughness and formability while maintaining good strength. This material is suitable for cold-formed welded hollow sections (ERW) used in various structural applications where medium strength and good ductility are required. The hollow sections are available in round, square, rectangular, and elliptical profiles. S275MH provides reliable performance under static and dynamic loading, with guaranteed impact energy at 0°C (minimum 40 J). The fine grain nature ensures consistent mechanical properties across thicknesses.
EN 10219-1 S275MH ERW Pipe Chemical Composition
The chemical composition for S275MH is according to the base steel S275M as per EN 10025-4. Fine grain practice is ensured by sufficient aluminum or other grain-refining elements such as niobium, vanadium, or titanium. The low carbon equivalent (CEV) guarantees good weldability.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.13 | Max. |
| Silicon (Si) | ≤0.50 | Max. |
| Manganese (Mn) | ≤1.50 | Max. |
| Phosphorus (P) | ≤0.030 | Max. |
| Sulfur (S) | ≤0.025 | Max. |
| Aluminum (Al) | ≥0.015 | Min. total, grain refinement |
| Niobium (Nb) | ≤0.05 | Max. |
| Vanadium (V) | ≤0.08 | Max. |
| Titanium (Ti) | ≤0.05 | Max. |
| Nickel (Ni) | ≤0.30 | Max. (unless otherwise agreed) |
| Chromium (Cr) | ≤0.10 | Max. |
| Molybdenum (Mo) | ≤0.08 | Max. |
| Copper (Cu) | ≤0.30 | Max. |
| C.E.V. | ≤0.34 | Carbon Equivalent Value, based on IIW formula |
EN 10219-1 S275MH ERW Pipe Physical Properties
The following physical properties are typical for fine grain structural carbon-manganese steels and are provided for design calculations. Values may vary slightly depending on exact composition and processing.
| Property | Standard Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic modulus (E) | 210 | GPa | At 20°C |
| Shear modulus (G) | 81 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.3 | — | In elastic range |
| Thermal expansion coefficient (α) | 12.0 × 10⁻⁶ | /K | 20 – 100°C |
| Thermal conductivity (λ) | 50 | W/(m·K) | At 20°C (typical) |
| Specific heat capacity (cp) | 460 | J/(kg·K) | At 20°C (typical) |
| Electrical resistivity (ρe) | 0.20 | µΩ·m | At 20°C (typical) |
EN 10219-1 S275MH ERW Pipe Mechanical Properties
The mechanical properties for S275MH hollow sections are derived from EN 10219-1. Tensile testing is performed on longitudinal specimens taken from the finished hollow section. Impact energy is measured on Charpy V-notch specimens at 0°C. Multiple thickness ranges are indicated as required by the standard.
| Property | Standard Value | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield Strength (ReH) | ≥275 | MPa | t ≤ 16 mm |
| Yield Strength (ReH) | ≥265 | MPa | 16 < t ≤ 40 mm |
| Yield Strength (ReH) | ≥255 | MPa | 40 < t ≤ 63 mm |
| Yield Strength (ReH) | ≥245 | MPa | 63 < t ≤ 80 mm |
| Yield Strength (ReH) | ≥235 | MPa | 80 < t ≤ 100 mm |
| Yield Strength (ReH) | ≥225 | MPa | 100 < t ≤ 120 mm |
| Tensile Strength (Rm) | 370 – 530 | MPa | All thicknesses (≤120 mm) |
| Elongation (A) | ≥24 | % | Longitudinal, t ≤ 40 mm |
| Elongation (A) | ≥23 | % | Longitudinal, 40 < t ≤ 100 mm |
| Elongation (A) | ≥22 | % | Longitudinal, 100 < t ≤ 120 mm |
| Impact Energy (KV2) | ≥40 | J | Longitudinal, at 0°C, t ≤ 60 mm (typical) |
| Bend Test | No cracks | — | Flattening test to 3/4 of original diameter, no crack |
EN 10219-1 S275MH ERW Pipe Fully Equivalent Material Standards and Designations
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| Europe | EN 10219-1 | S275MH | Original specification for cold-formed ERW hollow sections |
| Europe (plate) | EN 10025-4 | S275M (1.8818) | Equivalent base steel for plates, not hollow section |
| International (ISO) | ISO 630-6 | S275M | Thermomechanical rolled structural steel plate, similar chemistry |
EN 10219-1 S275MH ERW Pipe Application Introduction
S275MH ERW pipe is extensively used in structural engineering where a balance of strength, weldability, and formability is required. Its fine grain structure provides reliable toughness and uniform properties. Typical applications include:
Product Applications: Structural hollow sections for frames and columns, Bridge substructures and decks, Scaffolding and formwork, Crane booms and lifting equipment, Architectural exposed steelwork, Roller coaster tracks, Agricultural machinery
Processed into products: Building columns (round and rectangular HSS), Truss chords and bracings, Piling and foundation elements, Offshore platform legs and braces, Mechanical booms and extensions, Guardrails and crash barriers, Ventilation ducts (heavy-duty)
Application industries: Construction, Civil engineering, Offshore and marine structures, Machinery and equipment manufacturing, Transportation (rail, automotive), Energy (wind turbine towers, solar supports)
EN 10219-1 S275MH ERW Pipe Similar and Alternative Materials for Comparison
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| Europe | EN 10219-1 | S275J2H | Non-alloy structural hollow section, minimum yield 275 MPa, impact at -20°C, higher CEV |
| Europe | EN 10219-1 | S275NH | Normalized fine grain hollow section, similar strength, better toughness at low temp |
| USA | ASTM A500 | Grade B | Cold-formed welded structural tubing, min yield 315 MPa (rect) / 290 MPa (round), higher strength |
| USA | ASTM A572 | Grade 50 | High-strength low-alloy structural steel, yield 345 MPa, may be overmatching |
| Japan | JIS G 3466 | STKR 400 | Carbon steel square/rectangular tubes, yield ~245 MPa, lower strength |
Notes:
S275MH is suitable for galvanizing and most coating systems. Welding should follow EN 1011-2 recommendations; preheating is not usually required due to low CEV. For severe forming, a flattening test or bend test is specified. All hollow sections can be supplied with end finishing (plain, beveled) and lengths as per order. The material is not intended for pressure equipment applications.
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