EN 10219 S275MH SSAW Pipe
EN10219 S275MH SSAW Pipe: Chemical, Mechanical & Physical Properties Guide
Full material analysis of EN10219 S275MH steel for spiral submerged arc welded (SSAW) pipes, including chemical composition, mechanical and thermophysical properties, equivalents, and typical applications.
Cold forming, spiral welding, submerged arc welding, machining, cutting, welding
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
EN 10219 S275MH SSAW Pipe Introduction
EN10219 S275MH is a thermomechanically rolled weldable fine-grain structural steel defined in European standard EN 10219-1 for cold-formed welded structural hollow sections. It is widely used for SSAW (spiral submerged arc welded) pipes, offering a minimum yield strength of 275 MPa, good toughness, and excellent weldability. The fine-grain structure, achieved through controlled rolling and microalloying, provides superior mechanical properties compared to basic non-alloy grades. S275MH hollow sections are available in round, square, and rectangular shapes, with SSAW pipes being particularly suited for large-diameter structural applications such as piling, columns, and jacket structures.
EN 10219 S275MH SSAW Pipe Chemical Composition
The chemical composition of S275MH is tightly controlled to ensure consistent mechanical properties and good weldability. It is a fine-grain steel where aluminum is used as the primary grain-refining element, sometimes supplemented by small additions of niobium, vanadium, or titanium. Maximum levels of residual elements and low carbon content contribute to excellent toughness and resistance to brittle fracture.
| Element | Mass Fraction (%) | Remarks |
|---|---|---|
| C | ≤ 0.13 | |
| Si | ≤ 0.50 | |
| Mn | ≤ 1.50 | |
| P | ≤ 0.035 | |
| S | ≤ 0.035 | |
| Al (total) | ≥ 0.015 | Grain refining |
| Nb | ≤ 0.05 | Microalloying |
| V | ≤ 0.12 | Microalloying |
| Ti | ≤ 0.05 | Microalloying |
| Nb+V+Ti | ≤ 0.22 | Sum of microalloying elements |
| Ni | ≤ 0.30 | Residual |
| Cr | ≤ 0.30 | Residual |
| Mo | ≤ 0.10 | Residual |
| Cu | ≤ 0.35 | Residual |
| N | ≤ 0.015 |
EN 10219 S275MH SSAW Pipe Thermal & Electrical Physical Properties
The following physical properties are typical for low-carbon fine-grain structural steels and are not part of the mandatory EN 10219-1 specification. They serve as a general guide for design calculations. Actual values can vary slightly depending on exact composition and processing history.
| Property | Typical Value | Unit | Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Young's modulus (E) | 210 | GPa | Room temperature, static |
| Shear modulus (G) | 81 | GPa | Room temperature |
| Poisson's ratio (ν) | 0.3 | — | Elastic range |
| Coefficient of thermal expansion (α) | 11.5 ×10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal conductivity (λ) | 50 | W/(m·K) | at 20 °C |
| Specific heat capacity | 460 | J/(kg·K) | at 20 °C |
| Electrical resistivity (ρₑ) | ≈ 0.22 | µΩ·m | at 20 °C |
EN 10219 S275MH SSAW Pipe Mechanical Properties
Mechanical properties are determined on longitudinal test pieces taken from the finished hollow section. Yield strength, tensile strength, and elongation requirements depend on nominal wall thickness. Impact toughness is specified at -20°C for J0 class (commonly supplied) and can be upgraded to J2 or K2 for lower temperatures. All values comply with EN 10219-1.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥ 275 | MPa | Thickness ≤ 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 |
| Tensile strength (Rm) | 430 – 580 | MPa | Thickness ≤ 40 mm |
| Tensile strength (Rm) | 410 – 560 | MPa | 40 < t ≤ 80 mm |
| Tensile strength (Rm) | 400 – 540 | MPa | 80 < t ≤ 100 mm |
| Elongation (A, proportional) | ≥ 24 | % | Gauge length = 5.65√S₀, t ≤ 40 mm |
| Elongation (A, proportional) | ≥ 23 | % | Gauge length = 5.65√S₀, 40 < t ≤ 63 mm |
| Elongation (A, proportional) | ≥ 22 | % | Gauge length = 5.65√S₀, 63 < t ≤ 100 mm |
| Impact energy (KV, J0) | ≥ 27 | J | -20 °C, longitudinal, avg. of 3 specimens |
| Bend test | No cracks or fissures | - | Mandrel dia. according to EN 10219-1 Table 5 (e.g., 2t for t≤16mm) |
EN 10219 S275MH SSAW Pipe Direct Equivalent Material Standards & Substitutable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10219-1 | S275MH | Original designation for cold-formed hollow sections (SSAW pipes). The sole exact equivalent is the same grade in EN 10219. |
EN 10219 S275MH SSAW Pipe Application Introduction
S275MH SSAW pipes are primarily designed for structural and civil engineering applications where large diameter and heavy wall thickness are required, together with reliable mechanical properties and good weldability. The thermomechanical rolling process ensures a fine grain structure, which translates into enhanced toughness and resistance to lamellar tearing, making it suitable for demanding welded connections.
Product Applications: SSAW/Spiral welded pipes for piling and foundation works, Large-diameter structural hollow section columns, Jacket legs and bracing in offshore platforms, Crane booms and lattice structures, Bridge piers and arches, Trusses and space frames, Tubular towers (e.g., wind turbine towers), Retaining wall piles and marine dolphins
Processed into products: Welded tubular columns and beams, Casing pipes for cast-in-place piles, Structural piles (king piles, anchor piles), Brackets and stiffeners for offshore modules, Transition pieces in wind towers, Heavy-duty bolted and welded connections, Stiffened tubular nodes (X, Y, K joints), Guard rails and impact protection barriers
Application industries: Civil Engineering, Construction & Building, Offshore & Marine, Shipbuilding, Oil & Gas (structural parts), Renewable Energy (wind turbines), Heavy Machinery & Cranes, Bridge & Infrastructure
EN 10219 S275MH SSAW Pipe Similar / Alternative Materials with Comparable Properties
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10210-1 | S275J2H | Hot finished, thermomechanical rolled; similar strength and impact, but hot formed; yield strength may be slightly higher for equal thickness. |
| European Union | EN 10025-4 | S275M/ML | Thermomechanical rolled plate/strip for welded structures; same basic strength, used as parent material for SSAW pipe. |
| United States | ASTM A500 / A500M | Grade C | Cold-formed welded structural tubing; yield 345 MPa (higher), but often used as high-strength alternative. Carbon higher. |
| United States | ASTM A572 / A572M | Grade 50 | High-strength low-alloy structural steel; yield 345 MPa, can be a strength upgrade; weldability similar. |
| Japan | JIS G 3466 | STKR490 | Carbon steel square/rectangular tube; yield 325 MPa, often used for structural hollow sections; not a perfect match but often substituted. |
Notes:
S275MH is supplied with thermomechanical rolling condition 'M', giving it better formability and weldability than conventionally hot-rolled grades. For SSAW pipes, the grade can be delivered with impact testing requirements J0 (27J at -20°C), J2 (27J at -40°C), or K2 (40J at -20°C or lower) according to EN 10219. The pipe manufacturing process (spiral forming and submerged arc welding) may impose additional dimensional and testing requirements (e.g., weld seam hardness, NDT). Always refer to the specific purchase order and applicable parts of EN 10219 for full details on tolerances, coating, and supplementary testing.
- Share
