S 420 NL steel equivalent material gb

S420NL Steel Equivalent Material GB

As a premier exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025-3 compliant materials, including the versatile S420NL steel grade.

S420NL is a normalized fine-grain structural steel designed for welded constructions requiring enhanced toughness at low temperatures, down to -50°C.

Ideal for heavy-duty applications in bridges, cranes, and offshore structures, our S420NL plates are delivered in normalized or normalized rolled conditions to ensure superior weldability and impact resistance.

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

S420NL Steel and Its GB Equivalent

S420NL steel (EN 10025-3, designation 1.8912) is a high-strength low-alloy (HSLA) fine-grain structural steel with a minimum yield strength of 420 MPa and excellent impact resistance at -50°C (27 J minimum longitudinal). The equivalent material in the Chinese GB standard is Q420E (GB/T 1591-2018), a high-strength low-alloy structural steel with similar yield strength, normalized delivery, and low-temperature toughness. Q420E is designed for welded structures in cold environments, making it a direct substitute for S420NL in GB-compliant projects<web:2><web:5>.

Gangsteel supplies S420NL and GB-equivalent plates with dual certifications, ensuring seamless integration for international projects. For related grades, see en 10025 3 s420nl normalized structural steel plate or en 10025 3 s460nl normalized structural steel plate.

Equivalent Grades Table for S420NL

Chemical Composition Comparison

Both grades feature low-carbon profiles for weldability, with Q420E allowing slightly higher impurities. Values are maximum % unless noted (ladle analysis, ≤100 mm thickness)<web:0><web:2>.

*Note: S420NL's tighter P/S enhance cold toughness; both maintain low CEV for welding without preheating in thin sections.

Mechanical Properties Comparison

Properties for normalized condition; S420NL and Q420E share similar profiles, with minimum values for ≤16 mm thickness<web:0><web:2><web:6>.

*Notes: Q420E standard impact at -40°C; specify -50°C for full equivalence. Properties scale similarly with thickness up to 250 mm.

Applications and Substitution Notes

• S420NL: Used in cold-climate bridges, offshore platforms, and cranes requiring -50°C toughness.
• Q420E: Suits similar welded structures in Chinese projects; for -50°C, verify impact testing.

When substituting, confirm Q420E's normalization and -50°C impact (27 J min) to match S420NL's requirements. For higher strength, consider en 10025 3 s460nl normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel offers ISO-certified S420NL and Q420E plates with dual certifications, ensuring global compatibility. Contact us at admin@gangsteel.com for tailored solutions.

Summary

The GB equivalent to S420NL steel is Q420E (GB/T 1591-2018), offering matching 420 MPa yield, tensile strength, and normalized fine-grain structure for low-temperature welded applications. Minor chemistry differences exist, but both ensure excellent toughness and weldability in structural projects. S420NL from Gangsteel ensures seamless sourcing with certified plates for optimal performance.

FAQ

What is the GB equivalent to S420NL?

Q420E under GB/T 1591-2018 is the primary equivalent, with 420 MPa yield and normalized condition. For -50°C impact, specify testing to match S420NL's 27 J.

How do the chemical compositions of S420NL and Q420E differ?

S420NL has tighter limits on P (0.025% max vs. 0.035%) and S (0.020% vs. 0.035%) for better cold toughness, but both have CEV ≤0.48 for weldability.

Are the mechanical properties identical between S420NL and Q420E?

Yes for yield (420 MPa) and tensile (520–680 MPa) at thin sections; elongation is similar (19%). Q420E needs -50°C impact testing for full equivalence.

Can Q420E replace S420NL in international projects?

Yes, with certification; it's ideal for China-sourced supply chains, but confirm impact testing for sub-zero use per EN/GB standards<web:2>.

What if I need a higher-strength GB equivalent?

For S460NL equivalents, use Q460D/E; contact Gangsteel for cross-standard advice.