What is BS EN 10025 Grade S275?

What is BS EN 10025 Grade S275?

As a leading exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing BS EN 10025-compliant materials, including the S275 steel grade.

S275 is a non-alloy structural steel under BS EN 10025-2, widely used for general construction and welded applications due to its balanced strength, ductility, and cost-effectiveness.

It is suitable for a variety of structural components, offering good weldability and moderate toughness.

Our S275 plates are supplied in as-rolled, normalized, or thermomechanically rolled conditions, depending on the variant.

For a comprehensive overview of our en 10025 3 normalized steel plate offerings, including related grades like en 10025 3 s275nl normalized structural steel plate, explore our full range. Contact us at admin@gangsteel.com for inquiries.

Overview of BS EN 10025 Grade S275

S275, as defined in BS EN 10025-2 (designation 1.0044 for S275JR), is a low-carbon structural steel with a minimum yield strength of 275 MPa for thicknesses ≤16 mm. It is available in three variants based on impact testing temperature:

• S275JR: Minimum 27 Joules at +20°C.
• S275J0: Minimum 27 Joules at 0°C.
• S275J2: Minimum 27 Joules at -20°C.

These variants cater to different environmental conditions, with S275J2 offering the best toughness for cooler climates. Unlike fine-grain normalized grades like en 10025 3 s275n normalized structural steel plate or en 10025 3 s275nl normalized structural steel plate (tested at -50°C), S275 is designed for general structural applications rather than extreme low-temperature environments. Gangsteel supplies S275 in thicknesses up to 250 mm, meeting BS EN 10025-2 requirements with full certifications.

Chemical Composition of S275

The chemical composition ensures good weldability and ductility (ladle analysis, max % unless noted, ≤100 mm thickness).

*Note: Low phosphorus and sulfur levels enhance ductility; Carbon Equivalent Value (CEV) ≤0.40 ensures excellent weldability.

Mechanical Properties of S275

Properties are specified for as-rolled or normalized conditions, varying by thickness and variant (minimum values).

*Notes: Elongation per Lo = 5.65 √So. Impact values apply to longitudinal direction; transverse values may differ. For extreme low-temperature toughness (-50°C), consider en 10025 3 s355nl normalized structural steel plate.

Weldability and Processing

S275 is highly weldable due to its low CEV (≤0.40):

• Preheating: Not required for thicknesses ≤40 mm; 50–100°C recommended for thicker sections to prevent cold cracking.
• Interpass Temperature: Maximum 200°C to maintain properties.
• Welding Processes: Suitable for SMAW, GMAW, GTAW; use low-hydrogen fillers (e.g., E7018) per EN 1011-2.
• Forming: Hot forming above 850°C; normalization may be needed if properties are affected.

Applications

S275 is used in:

• Construction: Buildings, warehouses, and structural frameworks.
• Infrastructure: Bridges, railings, and highway structures.
• Engineering: Machinery frames, supports, and light cranes.
• Fabrication: Welded components in moderate climates.

For higher strength or colder environments, explore en 10025 3 s420nl normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel offers ISO-certified S275 plates in custom sizes, with global export readiness. Contact us at admin@gangsteel.com for pricing, technical summaries, or mill certificates (EN 10204 3.1).

Summary

BS EN 10025-2 S275 is a non-alloy structural steel with a 275 MPa yield strength (≤16 mm), 410–560 MPa tensile strength, and 21–23% elongation, available in JR (+20°C), J0 (0°C), and J2 (-20°C) variants. It is ideal for general construction and welded structures, offering cost-effective performance with excellent weldability.

FAQ

What does S275 stand for in BS EN 10025-2?

“S” denotes structural steel, “275” indicates a minimum yield strength of 275 MPa (≤16 mm), and suffixes (JR, J0, J2) specify impact testing temperatures (+20°C, 0°C, -20°C, respectively).

What are the differences between S275JR, S275J0, and S275J2?

They share the same yield (275 MPa) and tensile strength (410–560 MPa) but differ in impact testing: S275JR at +20°C, S275J0 at 0°C, and S275J2 at -20°C, with 27 J minimum longitudinal impact energy.

Is S275 suitable for low-temperature applications?

S275J2 is suitable down to -20°C (27 J). For colder environments (-50°C), use S275NL per EN 10025-3 for enhanced toughness.

What are the equivalent grades for S275?

Equivalents include ASTM A36, A572 Gr. 42, DIN St 44-2, JIS SS400, and GB Q235B, with A572 Gr. 42 best matching S275J2 for impact properties.

How weldable is S275 steel?

Highly weldable due to CEV ≤0.40; preheating is typically not needed for thicknesses ≤40 mm, using low-hydrogen fillers per EN 1011-2.