S235 S275 S355 Steel Properties & Equivalent Chart (EN 10025)

Introduction

S235, S275 and S355 are the most widely used structural steel grades defined under EN 10025. They are commonly applied in buildings, bridges, machinery, and general structural fabrication.

This guide provides a clear overview of S235 S275 S355 steel properties, including yield strength, tensile strength, chemical composition, and equivalent grades (ASTM, JIS, GB). The focus is on technical data and standardized performance values.

S235 S275 S355 Steel Properties Quick Check Table

The table below summarizes the most searched mechanical properties of S235, S275 and S355 steel, including yield strength, and tensile strength.

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)
S235	235	360–510	≥26
S275	275	370–530	≥23
S355	355	470–630	≥22

These values represent standard minimum requirements according to EN 10025-2 for thickness up to 16 mm.

S235 S275 S355 Steel Equivalent Grades (ASTM, JIS, GB)

Understanding S235 S275 S355 steel equivalent is essential for international procurement and cross-standard material selection.

EN Standard	ASTM Equivalent	JIS Equivalent	GB Equivalent
S235JR	ASTM A36	SS400	Q235B
S275JR	ASTM A36 / ASTM A529	SM400A / B	Q275
S355JR	ASTM A572	SM490A / B	Q345B

These equivalents are approximate and should be verified against specific project requirements and standards.

S235 S275 S355 Steel Mechanical Properties (EN 10025)

1. Yield Strength of S235, S275 and S355

The yield strength of S235, S275 and S355 steel is the primary classification basis under EN 10025:

• S235 → 235 MPa
• S275 → 275 MPa
• S355 → 355 MPa

For thicker plates, the minimum yield strength decreases according to standard thickness ranges.

2. Tensile Strength of S235 S275 S355 Steel

Typical tensile strength of structural steel grades:

• S235: 360–510 MPa
• S275: 370–530 MPa
• S355: 470–630 MPa

Higher tensile strength indicates better resistance to deformation under load.

3. Elongation and Weldability

• S235: Highest ductility and excellent weldability
• S275: Balanced ductility and strength
• S355: Higher strength with slightly reduced formability

All three grades are considered weldable under standard fabrication conditions.

Chemical Composition of S235 S275 S355 Steel (C & Mn)

The difference in strength between these grades is mainly influenced by carbon and manganese content.

Grade	Carbon (C %)	Manganese (Mn %)	Explanation
S235	≤0.17	≤1.40	Low carbon, excellent weldability, lower strength
S275	≤0.21	≤1.50	Slightly higher carbon & manganese, balanced properties
S355	≤0.24	≤1.60	Higher C & Mn levels, resulting in higher yield strength

Engineers should note that while increasing C and Mn enhances yield strength, it can slightly reduce weldability.

S235 S275 S355 Steel Properties Summary

1.Strength: S355 > S275 > S235 in both yield and tensile strength

2.Structural Load Capacity:

• S235 → light structures
• S275 → medium-load components
• S355 → heavy-duty structures (bridges, cranes, machinery)

3.Weldability: All grades offer good weldability

4.Toughness / Sub-Grades: JR → J0 → J2, increasing energy absorption (Charpy impact)

For a practical understanding of how these grades differ in real projects, including strength comparison, price differences and selection considerations, see our S235 vs S275 vs S355 steel comparison and selection guide.

For a deeper understanding of impact test requirements and the differences between JR, J2 and NL grades, see our S355JR vs S355J2 vs S355NL differences guide.

Frequently Asked Questions

• What is S355 steel properties?
  S355 steel properties include a minimum yield strength of 355 MPa and tensile strength of 470–630 MPa, offering high strength and structural performance.
• What is S275 steel properties?
  S275 steel properties include a minimum yield strength of 275 MPa and tensile strength of 370–530 MPa, providing balanced strength and ductility.
• What is S235 steel properties?
  S235 steel properties include a minimum yield strength of 235 MPa and tensile strength of 360–510 MPa, with excellent weldability and formability.
• What is the yield strength of S235, S275 and S355 steel in MPa?
  The yield strength is 235 MPa for S235, 275 MPa for S275 and 355 MPa for S355 under EN 10025 for thickness up to 16 mm.
• What is S355 steel equivalent in ASTM standards?
  S355 steel is commonly equivalent to ASTM A572 Grade 50, with similar mechanical properties and strength.
• What is S235 equivalent material?
  S235 is typically equivalent to ASTM A36, SS400 or Q235B depending on the standard used.
• What are S275 steel equivalent materials?
  S275 steel equivalents include ASTM A36 or A529, SM400 grades and Q275, with comparable structural performance.
• What is the difference between S235, S275 and S355 steel properties?
  The main difference is strength, with S355 having the highest yield and tensile strength, followed by S275 and S235.