s420n steel grade equivalent GB

S420N Steel Grade Equivalent GB

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

The S420N steel grade equivalent GB is Q420D (GB/T 1591-2018), a high-strength low-alloy structural steel with comparable yield strength, weldability, and normalized delivery.

Our S420N plates are certified for dual standards (EN + GB) upon request.

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

S420N Steel Grade Equivalent GB Table

Q420C/D/E= higher quality levels (lower P/S). Q420N = not standard; use Q420D normalized.

Chemical Composition Comparison (Max %, ≤100 mm)

S420Nhas tighter P/S for better toughness. Q420D allows slightly higher impurities but matches CEV.

Mechanical Properties Comparison (≤16 mm, Min Values)

Impact Note: Q420D standard impact at 0°C. Specify Q420C + -20°C test for full S420N match.

Substitution Guidelines

1. Use Q420D normalizedto match S420N delivery.
2. Specify -20°C impact (34 J min)for equivalence (Q420C level).
3. Verify CEV ≤ 0.48in mill certificate.
4. Welding: Same procedures — no preheat ≤50 mm.

Why Gangsteel for S420N & Q420D?

• Dual-Certified Plates(EN 10025-3 + GB/T 1591)
• Stock– 6–250 mm
• Testing– UT, Z35, HIC
• Global Export

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

Summary

The S420N steel grade equivalent GB is Q420D (GB/T 1591) — matching 420 MPa yield, 520–680 MPa tensile, and normalized delivery. For exact -20°C impact, specify Q420C with testing.

FAQ

What is the GB equivalent of S420N steel grade?

Q420D (GB/T 1591-2018)is the direct equivalent:

• Yield: 420 MPa
• Tensile: 520–680 MPa
• Normalized delivery
• CEV: ≤0.48

How does Q420D compare to S420N in chemistry?

Identical major elements(C ≤0.20%, Mn 1.00–1.70%). S420N has lower P/S (0.025/0.020 vs 0.040) for better toughness. Q420D allows higher Nb/Ti for strength.

Are mechanical properties the same?

Yesfor yield, tensile, and elongation. Impact: S420N = 40 J at -20°C; Q420D = 34 J at 0°C. Specify Q420C + -20°C test for full match.

Can Q420D replace S420N without changes?

Yes, if:

• Normalized
• Impact tested at -20°C
• CEV ≤ 0.48

Ideal for Chinese projects or dual-standard supply.

What if I need -50°C toughness?

Use S420NL (EN) or Q420D/E with -40°C spec — contact Gangsteel for custom testing.