S275MLH Steel for SSAW Pipe
S275MLH Steel for SSAW Pipe - EN 10219 Cold-Formed Hollow Sections
Comprehensive material data for S275MLH steel used in spiral submerged arc welded (SSAW) pipes per EN 10219. Includes chemical composition, mechanical properties, physical data, equivalents, and application guidance.
Cold forming, submerged arc welding (SAW, SSAW), electric resistance welding (ERW), cutting, bending, machining, drilling
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
S275MLH Steel for SSAW Pipe Introduction
S275MLH is a thermomechanically rolled weldable fine-grain structural steel with a minimum yield strength of 275 MPa, specified in EN 10219 for cold-formed welded hollow sections. The "ML" designation denotes thermomechanical rolling and the "L" guarantees impact toughness down to -50°C; "H" signifies hollow section. When fabricated into SSAW pipe, it delivers excellent weldability, good low‑temperature toughness, and high structural integrity. This combination makes S275MLH ideal for load‑bearing frameworks, offshore structures, piling, and machinery operating in cold climates.
S275MLH Steel for SSAW Pipe Chemical Composition
Typical melt analysis limits for S275MLH in accordance with EN 10219-1. The steel is fully killed and fine‑grain treated with aluminum and micro‑alloying elements. Maximum carbon equivalent (CEV) of 0.40% ensures good weldability. All values are maximum unless a range is specified.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| C | ≤ 0.13 | Carbon content, max |
| Si | ≤ 0.50 | Silicon, max |
| Mn | ≤ 1.50 | Manganese, max |
| P | ≤ 0.020 | Phosphorus, max |
| S | ≤ 0.008 | Sulfur, max |
| N | ≤ 0.015 | Nitrogen, max |
| Al (total) | ≥ 0.020 | Total aluminum, min; fine‑grain requirement |
| Nb | ≤ 0.06 | Niobium, max |
| V | ≤ 0.10 | Vanadium, max |
| Ti | ≤ 0.05 | Titanium, max |
| Cr | ≤ 0.30 | Chromium, max |
| Ni | ≤ 0.30 | Nickel, max |
| Mo | ≤ 0.10 | Molybdenum, max |
| Cu | ≤ 0.35 | Copper, max |
| CEV | ≤ 0.40 | Carbon equivalent (CEV) = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
S275MLH Steel for SSAW Pipe Thermal and Electrical Physical Properties
Typical physical properties for S275MLH steel at ambient temperature. These values are representative for carbon‑manganese structural steels and can be used for engineering calculations. Slight variations may occur depending on exact composition and processing history.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20 °C |
| Elastic Modulus (E) | 210 | GPa | 20 °C, tensile |
| Shear Modulus (G) | 81 | GPa | 20 °C, estimated |
| Poisson's Ratio (ν) | 0.3 | – | 20 °C |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20–100 °C |
| Thermal Expansion Coefficient (α) | 13.0 | 10⁻⁶/K | 20–200 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | 20 °C |
| Specific Heat Capacity | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρ_e) | 0.20 | µΩ·m | 20 °C |
S275MLH Steel for SSAW Pipe Mechanical Properties
Room‑temperature mechanical properties for S275MLH hollow sections with thickness ≤ 16 mm, tested in longitudinal direction according to EN 10219-1. Impact energy is guaranteed at -50°C (L‑grade). The bending test uses a former diameter of 3t for thicknesses up to 16 mm.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 275 | MPa | t ≤ 16 mm, longitudinal specimen |
| Yield Strength (ReH) | ≥ 265 | MPa | 16 < t ≤ 40 mm |
| Tensile Strength (Rm) | 370 – 530 | MPa | Longitudinal specimen |
| Elongation (A) | ≥ 24 | % | Gauge length 5.65√S₀, longitudinal |
| Elongation (A) | ≥ 22 | % | Gauge length 5.65√S₀, transverse |
| Impact Energy KV (-50 °C) | ≥ 27 | J | Charpy V‑notch, longitudinal |
| Bending Test (Bend Angle 180°) | d = 3t | – | t ≤ 16 mm; no cracks |
S275MLH Steel for SSAW Pipe Completely Equivalent Material Standards and Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10219-1 | S275MLH | Direct equivalent; identical scope for cold‑formed hollow sections |
| Germany | DIN EN 10219-1 | S275MLH | National adoption of the European standard |
| United Kingdom | BS EN 10219-1 | S275MLH | BSI adoption; fully equivalent |
| France | NF EN 10219-1 | S275MLH | AFNOR adoption; identical technical requirements |
S275MLH Steel for SSAW Pipe Application Introduction
S275MLH SSAW pipe is a versatile structural product that combines strength, weldability, and low‑temperature toughness. Its balance of properties makes it suitable for a broad range of demanding engineering applications.
Product Applications: Structural columns and beams, Bridge piers and trusses, Piling pipe for foundations, Crane booms and lattice masts, Offshore jacket legs and braces, Transmission towers and chimney stacks, Spiral‑welded pipelines for water, slurry, and low‑pressure gas
Processed into products: Welded tubular connections (T‑, Y‑, K‑joints), Base plates and stiffeners for pipe sections, Milled or drilled flanges for structural joints, Machined rings and sleeves for bearing assemblies, Hydraulic cylinder tubes (light duty), Roller bodies and conveyor shaft sleeves
Application industries: Civil engineering and construction, Offshore and marine structures, Port and harbour piling, Heavy machinery and crane manufacturing, Wind energy (turbine towers, foundations), Industrial plant and process equipment
S275MLH Steel for SSAW Pipe Similar / Alternative Material Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A500/A500M | Grade C | Higher yield (317 MPa rounded), no mandatory low‑temperature impact; similar structural tube application |
| Japan | JIS G 3466 | STKR 400 | Tensile 400–540 MPa, standard structural carbon steel tube; no impact or CEV control |
| China | GB/T 3091 | Q345D (coated structural pipe) | 345 MPa yield, D‑quality offers -20°C impact; not specifically designed for cold‑formed hollow sections |
| International | ISO 630-2 | S275M | Same as plate feedstock for S275MLH; not a hollow section standard, but provides base material properties |
| Europe | EN 10210-1 | S275J2H | Hot‑finished hollow section; J2 grade guarantees -20°C impact; slightly lower CMn requirements than MLH |
Notes:
Additional requirements for SSAW pipe: Depending on end use, supplementary testing such as hydrostatic test, 100% UT or RT weld inspection, and CVN on weld metal and HAZ may be specified. Dimensional tolerances follow EN 10219-2. For fluid conveyance, API 5L PSL1 Gr B is sometimes used as an alternative but does not carry the "L"‑grade toughness. The CEV ≤ 0.40% allows welding with low preheat even for thicker sections. This steel is supplied under the EU Construction Products Regulation (CPR) with CE marking.
- Share
