s275nl vs s355nl properties

S275NL vs S355NL Properties: EN 10025-3 Normalized Steel Grades

As a leading exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025-3 compliant materials, including S275NL and S355NL.

Both are normalized fine-grain structural steels designed for welded constructions with excellent low-temperature toughness at -50°C.

Their primary differences lie in strength levels, making each suitable for distinct applications.

Our plates are supplied in normalized or normalized rolled conditions, ensuring superior weldability and performance.

For a comprehensive overview of our en 10025 3 normalized steel plate offerings, explore our full range.

Chemical Composition Comparison

Both grades have low-carbon profiles for weldability, but S355NL includes higher alloying for increased strength (ladle analysis, max % unless noted, ≤100 mm thickness).

*Note: S355NL’s higher Mn and V boost strength; low P/S ensure toughness in both.

Mechanical Properties Comparison

S355NL provides higher yield and tensile strength than S275NL, while both maintain identical low-temperature toughness (normalized condition, minimum values).

*Notes: Elongation per Lo = 5.65 √So. S355NL’s higher strength allows thinner sections for similar loads.

Weldability Comparison

Both grades are highly weldable due to low CEV (S275NL ≤0.40, S355NL ≤0.43). Preheating is typically not required for thicknesses ≤40 mm; S355NL may need 50–100°C preheat for >40 mm due to higher alloying. Use low-hydrogen electrodes (e.g., E7018) per EN 1011-2.

Applications

• S275NL: Cost-effective for moderate loads in cold climates, e.g., standard bridges, cranes, and light frameworks. See en 10025 3 s275nl normalized structural steel plate.
• S355NL: Suited for high-strength needs in heavy-duty structures like offshore platforms, major bridges, and wind turbine towers. See en 10025 3 s355nl normalized structural steel plate.

For even higher strength, consider en 10025 3 s420nl normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel offers ISO-certified S275NL and S355NL plates in custom sizes with global export readiness. Contact us for tailored solutions.

Summary

S355NL and S275NL, both EN 10025-3 normalized steels, share identical -50°C toughness (27 J longitudinal) but differ in strength: S355NL has a higher yield (355 MPa vs. 275 MPa) and tensile strength (470–630 MPa vs. 370–510 MPa), making it ideal for heavier loads, while S275NL is more economical for lighter applications.

FAQ

What is the main difference in strength between S355NL and S275NL?

S355NL has a higher minimum yield strength (355 MPa vs. 275 MPa for ≤16 mm) and tensile strength (470–630 MPa vs. 370–510 MPa), allowing it to handle greater structural loads with thinner sections.

Do S355NL and S275NL have the same low-temperature toughness?

Yes, both guarantee 27 J longitudinal (16 J transverse) impact energy at -50°C, ensuring equivalent resistance to brittle fracture in cold environments.

How do their chemical compositions differ?

S355NL allows higher carbon (0.18% vs. 0.16%), silicon (0.50% vs. 0.40%), manganese (0.90–1.65% vs. 0.50–1.50%), and vanadium (0.12% vs. 0.05%) for increased strength, with a slightly higher CEV (0.43 vs. 0.40). Both maintain low P/S for toughness.

When should I use S275NL instead of S355NL?

Choose S275NL for cost-sensitive projects with moderate loads, such as standard bridges or light cranes in cold climates, where 275 MPa yield is sufficient, reducing material costs.

When is S355NL preferred over S275NL?

Select S355NL for high-strength applications like offshore platforms, heavy bridges, or wind turbines, where its 355 MPa yield and higher tensile strength optimize structural efficiency and reduce weight.

Are there differences in welding S355NL vs. S275NL?

Both are weldable, but S355NL’s higher CEV (≤0.43) may require preheating (50–100°C) for thicknesses >40 mm, unlike S275NL (≤0.40). Use matching fillers and follow EN 1011-2.