en 10025-3 s420n equivalent

EN 10025-3 S420N Equivalent Grades

As a premier exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025-3 compliant materials, including the high-strength S420N steel grade.

S420Nis a normalized fine-grain structural steel with 420 MPa minimum yield strength and 40 J impact toughness at -20°C, ideal for heavy welded constructions such as bridges, cranes, offshore platforms, and high-rise buildings.

Understanding S420N equivalent grades in international standards is essential for global sourcing, cross-certification, and project compliance.

Our S420N plates are delivered in normalized (+N) condition with full traceability and EN 10204 3.1/3.2 certifications.

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

S420N Equivalent Grades Table

Note: S420NC is not valid — likely a typo for S420N or S420MC (EN 10149-2).

Chemical Composition Comparison (Max %, ≤100 mm)

CEV Formula: C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 All equivalents maintain low CEV for excellent weldability.

Mechanical Properties Comparison (≤16 mm, Min Values)

Impact Note: A572 Gr. 65 and Q420B require specific impact testing to match S420N’s -20°C requirement.

S420N vs S420NL: Impact on Equivalence

For -50°C, use S420NL or specify A572 Gr. 65 with CVN at -50°C.

Applications & Substitution Guidelines

• S420N: Long-span bridges, cranes, high-rise columns
• Equivalents(A572 Gr. 65, Q420B): Same uses with normalized delivery
• Substitution Rules:
  1. Match normalized condition
  2. Verify impact testing at -20°C
  3. Confirm CEV ≤ 0.48 for weldability
  4. Use mill test certificates for compliance

Why Gangsteel for S420N & Equivalents?

• Dual-Certified Plates(EN + ASTM/GB)
• Stock Ready– 6–250 mm thickness
• Testing– UT, Z35, HIC, PWHT
• Global Export– FOB/CIF
• Technical Support– WPS, design optimization

Contact: admin@gangsteel.comProduct Page: en 10025 3 s420n normalized structural steel plate

Summary

EN 10025-3 S420N equivalent gradesinclude:

• ASTM A572 Gr. 65
• DIN TStE 420
• JIS SM570
• GB Q420B

All offer ~420–460 MPa yield, normalized delivery, and comparable weldability. For exact equivalence, specify -20°C impact testing and fine-grain structure.

FAQ

What is the closest ASTM equivalent to S420N?

ASTM A572 Grade 65— normalized, 450 MPa yield, similar chemistry and weldability. Specify Charpy V-notch at -20°C to match S420N’s 40 J requirement.

How does GB Q420B compare to S420N?

Q420B (GB/T 1591)is nearly identical:

• Yield: 420 MPa
• Tensile: 520–680 MPa
• CEV: ≤0.48
• Requires normalization and -20°C impact for full equivalence.

Is JIS SM570 equivalent to S420N?

SM570 (JIS G 3106)has higher yield (460 MPa) and tensile strength, but no standard -20°C impact. When normalized and impact-tested, it serves as a stronger substitute.

What is the difference between S420N and its equivalents in toughness?

S420N guarantees 40 J at -20°C. Equivalents like A572 Gr. 65 or Q420B need specific impact testing to match — always verify mill test reports.

Can I use S420N equivalents without re-qualification?

Yes, if:

• Delivery condition = normalized
• Impact = 40 J at -20°C
• CEV ≤ 0.48
• WPS (Welding Procedure Specification) is qualified

For offshore (DNV/GL) or seismic (AISC), third-party approval may be needed.