s275n vs s275jr steel material

S275N vs S275JR Steel Material

As a premier exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025 compliant materials, including the S275N and S275JR steel grades.

S275N (EN 10025-3) is a normalized fine-grain structural steel with enhanced low-temperature toughness (-20°C impact), while S275JR (EN 10025-2) is a non-alloy structural steel for general use with impact at +20°C. S275N is better for cold environments, S275JR for cost-effective mild applications.

Our S275N and S275JR plates are delivered in normalized or as-rolled conditions to ensure optimal performance. For a comprehensive overview of our en 10025 3 normalized steel plate offerings, explore our full range.

Overview of S275N and S275JR Steel Material

S275N (material no. 1.0490) is a weldable fine-grain steel under EN 10025-3 for normalized/normalized rolled delivery, designed for structures needing impact resistance at -20°C (47 J min longitudinal). S275JR (1.0044) is a non-alloy steel under EN 10025-2, as-rolled or normalized, for general construction with impact at +20°C (27 J min).

S275N's normalization creates a finer grain structure for better cold toughness, while S275JR is more economical for non-critical uses.

Gangsteel supplies both in thicknesses up to 250 mm, with custom certifications.

Chemical Composition Comparison

Both have low-carbon profiles for weldability, but S275N has tighter limits for toughness (ladle analysis, max % unless noted, ≤100 mm).

*Note: S275N's lower C and tighter S, plus Al for grain refinement, enhance cold toughness.

Mechanical Properties Comparison

S275N and S275JR have similar strength but differ in impact and grain structure (normalized +N for S275N, as-rolled for S275JR; minimum values for ≤16 mm unless noted).

*Notes: Yield decreases with thickness for both (e.g., 205 MPa at 200–250 mm). S275N's normalization provides finer grain for better cold ductility.

Heat Treatment and Welding Comparison

• Heat Treatment: S275JR as-rolled; S275N normalized (880–920°C austenitize, air cool) for refined grain.
• Welding: Both low CEV (0.40), no preheat ≤40 mm; use low-hydrogen fillers (E7018). S275N's fine grain reduces HAZ toughness loss.

Follow EN 1011-2. Gangsteel optimizes for both.

Applications Comparison

• S275JR: General construction, buildings, mild climates (cost-effective).
• S275N: Moderate cold projects like offshore or northern bridges (better toughness).

For extreme cold, use S275NL.

Why Gangsteel for S275N and S275JR?

With ISO-certified quality, Gangsteel supplies both grades tailored to specifications, stocked for immediate export. Visit our en 10025 3 s275n normalized structural steel plate for details.

Summary

S275N and S275JR are EN 10025 structural steels with 275 MPa yield and 370–530 MPa tensile, but S275N is normalized for -20°C impact (47 J) and fine-grain toughness, while S275JR is as-rolled for +20°C (27 J) and general use. S275N excels in cold environments; S275JR in cost-sensitive applications. Both from Gangsteel ensure reliable performance.

FAQ

What is the main difference between S275N and S275JR?

S275N is normalized fine-grain with impact at -20°C (47 J), S275JR is as-rolled with impact at +20°C (27 J); S275N better for cold.

Are the chemical compositions identical?

Nearly — S275N has lower C (0.20% vs 0.21%), tighter S (0.030% vs 0.035%), and Al for grain refinement.

Do they have the same mechanical properties?

Yes for yield/tensile (275 MPa/370–530 MPa), but S275N's normalization provides better cold impact and ductility.

When to choose S275N over S275JR?

For moderate cold (-20°C) like offshore; S275JR for general/vague mild use.

Are welding requirements different?

Both low CEV (0.40), no preheat ≤40 mm; S275N's fine grain reduces HAZ risks.