S420n steel equivalent JIS

S420N Steel Equivalent JIS

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

S420N is a normalized fine-grain structural steel with a minimum yield strength of 420 MPa and excellent impact toughness at -20°C, ideal for welded constructions in bridges, cranes, and offshore structures.

Identifying its equivalent in the Japanese Industrial Standards (JIS) is crucial for global project compatibility.

Our S420N plates are supplied in normalized or normalized rolled conditions, ensuring superior weldability and performance.

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

S420N and Its JIS Equivalent

S420N (EN 10025-3, designation 1.8902) is a low-alloy, fine-grain structural steel with a minimum yield strength of 420 MPa and a minimum Charpy V-notch impact energy of 40 Joules at -20°C. The closest JIS equivalent is SM570 (JIS G 3106), a rolled steel for welded structures with comparable high strength, tensile properties, and weldability. When normalized, SM570 can achieve similar low-temperature toughness, though impact testing at -20°C must be specified to fully match S420N's requirements.

Gangsteel supplies S420N and JIS-equivalent grades with full certifications, ensuring seamless substitution for international projects. For related grades, see en 10025 3 s420n normalized structural steel plate or en 10025 3 s420nl normalized structural steel plate.

Equivalent Grades Table

Chemical Composition Comparison

Both grades feature low-carbon profiles for weldability (ladle analysis, max % unless noted, ≤100 mm thickness).

*Note: S420N's tighter P/S limits enhance cold toughness; SM570's composition supports weldability when normalized.

Mechanical Properties Comparison

Properties for normalized condition (SM570 as normalized to match S420N; ≤16 mm thickness, minimum values).

*Notes: SM570's higher yield (460 MPa) and tensile strength make it slightly stronger; impact at -20°C requires specific normalization.

Applications and Substitution Notes

• S420N: Used in cold-climate bridges, offshore platforms, and cranes requiring -20°C toughness.
• SM570: Suits welded structures like buildings and machinery; when normalized and impact-tested at -20°C, it matches S420N for structural use.

When substituting, verify SM570's normalization and impact testing to ensure -20°C performance. For higher strength, consider en 10025 3 s460n normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel offers ISO-certified S420N and JIS-equivalent plates with dual certifications, ensuring global compatibility. Contact us for tailored solutions.

Summary

The JIS equivalent to EN 10025-3 S420N is SM570 (JIS G 3106), offering comparable yield strength (460 MPa vs. 420 MPa), tensile strength, and weldability. When normalized and impact-tested at -20°C, SM570 matches S420N's low-temperature toughness for welded structures in moderate cold environments.

FAQ

What is the JIS equivalent to S420N?

SM570 (JIS G 3106) is the closest equivalent, with 460 MPa yield and similar weldability; specify normalization and -20°C impact testing for full equivalence.

How do S420N and SM570 differ chemically?

S420N has lower carbon (0.20% vs. 0.20%), phosphorus (0.025% vs. 0.035%), and sulfur (0.020% vs. 0.035%) for enhanced cold toughness, but both have comparable CEV (≤0.48) for weldability.

Are their mechanical properties identical?

SM570 has higher yield (460 MPa vs. 420 MPa) and tensile strength (570–720 MPa vs. 520–680 MPa) but similar elongation (19%). Impact at -20°C aligns if SM570 is normalized.

Can SM570 replace S420N in cold environments?

Yes, if normalized and tested for 40 J at -20°C, SM570 matches S420N's performance for applications like bridges or offshore platforms.

What if I need a higher-strength JIS equivalent?

For S460N equivalents, consider SM570 with enhanced specs; contact Gangsteel for cross-standard guidance.