S355J2 vs S355JR: Identical strength — different impact toughness requirements
S355J2 vs S355JR
Side-by-side chemical composition and mechanical property comparison.
Overview
S355J2
1.0577
High-strength structural steel with impact testing at -20°C (J2). Higher toughness than S355JR (tested at +20°C). Used for bridges, crane structures, offshore platforms, and cold-weather applications where impact toughness at sub-zero temperatures is required.
S355JR
1.0045
High-strength low-alloy structural steel with minimum yield strength of 355 MPa. Standard grade for bridges, buildings, cranes, and general structural applications. Impact tested at +20°C (JR).
| S355J2 | S355JR | |
|---|---|---|
| Material Number | 1.0577 | 1.0045 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10025-2 | EN 10025-2 |
Chemical composition (wt%)
| Element | S355J2 | S355JR | Overlap |
|---|---|---|---|
| C | 0–0.22% | 0–0.24% | OK |
| Si | 0–0.55% | 0–0.55% | OK |
| Mn | 0–1.6% | 0–1.6% | OK |
| P | 0–0.025% | 0–0.035% | OK |
Mechanical properties
| Property | S355J2 | S355JR | Unit |
|---|---|---|---|
| tensile_strength | 470–630 | 470–630 | MPa |
| yield_strength | ≥ 355 | ≥ 355 | MPa |
| elongation | ≥ 22 | ≥ 22 | % |
Compatibility Assessment
Same composition and mechanical properties. Only difference: S355J2 is impact tested at -20°C (27J min), S355JR at +20°C. Choose J2 for outdoor/cold-weather structures, JR for indoor/moderate climate.
Frequently Asked Questions
Is S355J2 the same as S355JR?
S355J2 and S355JR have a 95% composition overlap. Identical strength — different impact toughness requirements
Can I replace S355J2 with S355JR?
In many cases, yes. The compositions overlap significantly (95%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between S355J2 and S355JR?
The main differences are in the following elements: overall alloying content. S355J2 is a Carbon Steel grade, while S355JR is a Carbon Steel grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.