s275 vs s355 properties

S275 vs S355 Properties: EN 10025-2 Structural Steel Grades

As a leading exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025-compliant materials, including S275 and S355 grades.

Both are non-alloy structural steels under EN 10025-2, designed for general construction and welded applications.

They differ significantly in strength, with S355 offering higher load-bearing capacity than S275.

Our plates are supplied in various delivery conditions, including as-rolled, normalized, or thermomechanically rolled, depending on grade variants.

For a comprehensive overview of our en 10025 3 normalized steel plate offerings, including related normalized grades like en 10025 3 s275nl normalized structural steel plate and en 10025 3 s355nl normalized structural steel plate, explore our full range.

Overview of S275 and S355

S275 and S355 (EN 10025-2, designations 1.0044 and 1.0045/1.0553/1.0577 for variants like S355J2) are structural steels used in construction, engineering, and infrastructure. The "S" stands for structural steel, "275" or "355" denotes minimum yield strength (MPa), and suffixes (e.g., JR, J0, J2) indicate impact testing temperatures (+20°C, 0°C, -20°C). Unlike their normalized counterparts (S275NL, S355NL under EN 10025-3), these grades are typically supplied in as-rolled or normalized conditions without mandatory fine-grain structure or -50°C toughness. S355 provides higher strength for heavier-duty applications, while S275 is more economical for lighter loads.

Gangsteel supplies both grades in thicknesses up to 250 mm, with certifications per EN 10204.

Chemical Composition Comparison

Both are low-carbon steels for weldability, but S355 allows slightly higher alloying for strength (ladle analysis, max % unless noted, ≤100 mm thickness).

*Note: S355’s higher C, Si, and Mn enhance strength; low P/S ensure ductility. CEV varies by grade variant (e.g., S355J2 lower than S355JR).

Mechanical Properties Comparison

S355 offers higher yield and tensile strength than S275, with impact properties varying by suffix (JR, J0, J2; as-rolled or normalized condition, minimum values for ≤16 mm).

*Notes: Elongation per Lo = 5.65 √So. Yield/tensile strength decreases with thickness (e.g., S355: 275 MPa at 200–250 mm). For -50°C toughness, use en 10025 3 s275nl normalized structural steel plate or en 10025 3 s355nl normalized structural steel plate.

Weldability

Both grades are weldable due to low CEV (S275 ≤0.40, S355 ≤0.45). Preheating is typically not required for thicknesses ≤40 mm; S355 may need 50–100°C preheat for thicker sections. Use low-hydrogen fillers (e.g., E7018) per EN 1011-2.

Applications

• S275 (JR/J0/J2): Cost-effective for general construction, light frameworks, buildings, and machinery where moderate strength suffices.
• S355 (JR/J0/J2): Ideal for high-strength needs in heavy bridges, industrial structures, and crane components. For extreme cold, consider en 10025 3 s420nl normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel offers ISO-certified S275 and S355 plates in custom sizes with global export readiness. Contact us for tailored solutions.

Summary

S355 (JR/J0/J2) provides higher yield (355 MPa) and tensile strength (470–630 MPa) than S275 (275 MPa, 410–560 MPa), making it suitable for heavier loads, while S275 is more economical for lighter applications. Both offer good weldability and impact resistance (up to -20°C for J2), but for -50°C toughness, normalized grades like S275NL/S355NL are required.

FAQ

What is the main strength difference between S275 and S355?

S355 has a higher minimum yield strength (355 MPa vs. 275 MPa for ≤16 mm) and tensile strength (470–630 MPa vs. 410–560 MPa), enabling it to support greater loads with thinner sections.

Do S275 and S355 have similar impact properties?

Yes, for matching suffixes (JR: +20°C, J0: 0°C, J2: -20°C), both provide 27 J longitudinal impact energy. S355NL/S275NL are needed for -50°C.

How do their chemical compositions differ?

S355 allows higher carbon (0.24% vs. 0.21%), silicon (0.55% vs. 0.40%), and manganese (1.60% vs. 1.50%) for increased strength, with a higher CEV (0.45 vs. 0.40).

When should I choose S275 over S355?

Use S275 for cost-sensitive projects with moderate loads, like light buildings or standard frameworks, where 275 MPa yield is sufficient.

When is S355 preferred over S275?

Choose S355 for high-strength applications like heavy bridges, industrial structures, or cranes, where 355 MPa yield reduces material thickness.

Are welding requirements different for S275 and S355?

Both are weldable, but S355’s higher CEV (≤0.45) may require preheating (50–100°C) for >40 mm thicknesses, unlike S275 (≤0.40). Follow EN 1011-2.