S275JR vs S355JR: Same EN 10025-2 family — different strength classes
S275JR vs S355JR
Side-by-side chemical composition and mechanical property comparison.
Overview
S275JR
1.0044
Medium-strength structural steel with minimum yield strength of 275 MPa. Bridges the gap between S235JR and S355JR. Used for general structural applications, lattice towers, masts, and light crane components. Impact tested at +20°C (JR).
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).
| S275JR | S355JR | |
|---|---|---|
| Material Number | 1.0044 | 1.0045 |
| Category | Carbon Steel | Carbon Steel |
| Standard | EN 10025-2 | EN 10025-2 |
Chemical composition (wt%)
| Element | S275JR | S355JR | Overlap |
|---|---|---|---|
| C | 0–0.21% | 0–0.24% | OK |
| Si | 0–0.6% | 0–0.55% | OK |
| Mn | 0–1.5% | 0–1.6% | OK |
| P | 0–0.035% | 0–0.035% | OK |
Mechanical properties
| Property | S275JR | S355JR | Unit |
|---|---|---|---|
| tensile_strength | 410–560 | 470–630 | MPa |
| yield_strength | ≥ 275 | ≥ 355 | MPa |
| elongation | ≥ 23 | ≥ 22 | % |
Compatibility Assessment
S355JR has 29% higher yield strength (355 vs 275 MPa) and proportionally higher tensile strength. S275JR allows slightly less carbon (0.21% vs 0.24% max). Both are general structural steels.
Frequently Asked Questions
Is S275JR the same as S355JR?
S275JR and S355JR have a 80% composition overlap. Same EN 10025-2 family — different strength classes
Can I replace S275JR with S355JR?
In many cases, yes. The compositions overlap significantly (80%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between S275JR and S355JR?
The main differences are in the following elements: overall alloying content. S275JR 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.