S275JR
1.0044Medium-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).
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM A36 | K02600 | REF |
| 🇪🇺 | EN | Europe | S275JR | 1.0044 | 100% |
| 🇪🇺 | DIN | Europe | St44-2 (old) | — | 98% |
| 🇨🇳 | GB | China | Q275 | — | 95% |
| 🇯🇵 | JIS | Japan | SS400 | — | 88% |
Sources: ASTM A36/A36M, EN 10025-2:2019, DIN 17100, GB/T 700, JIS G3101
Chemical composition comparison (wt%)
Side-by-side: S275JR (EN) (EN 10025-2:2019) vs St44-2 (old) (DIN)
| Element | S275JR (EN) | St44-2 (old) (DIN) | Overlap |
|---|---|---|---|
| C | 0–0.21% | — | — |
| Si | 0–0.6% | — | — |
| Mn | 0–1.5% | — | — |
| P | 0–0.035% | — | — |
| S | 0–0.035% | — | — |
| Cu | 0–0.55% | — | — |
| N | 0–0.012% | — | — |
Mechanical properties
General
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 410–560 | MPa |
| Yield Strength | ≥ 275 | MPa |
| Elongation | ≥ 23 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Compatibility verdict
S275JR and St44-2 (old): 98% composition match
Close equivalents but NOT identical.
Related materials
S355JR
1.0045High-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).
S690QL
1.8928High-strength quenched and tempered fine-grain structural steel with minimum yield strength of 690 MPa. Used for heavily loaded structures like mobile cranes, mining equipment, bridges, and pressure vessels.
C10
1.0301Low-carbon unalloyed steel. Excellent weldability, good formability, and low hardness. Used for pins, rivets, bushings, case-hardened parts with thin case depth, and general cold-formed components. Can be case-hardened for surface wear resistance.
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