C75S
1.1248High-carbon spring strip steel — C 0.70-0.80%. Between C67S (0.65-0.72%) and C85S (0.83-0.90%). Good fatigue strength and edge retention. Used for flat springs, leaf springs, saw blades, snap rings, and reed valves. Available as cold-rolled precision strip in hardened & tempered condition (HRC 58-62).
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1075 | — | REF |
| 🇪🇺 | EN | Europe | C75S / 1.1248 | 1.1248 | 100% |
Sources: ASTM A29, EN 10132-4
Chemical composition comparison (wt%)
Side-by-side: C75S (EN) (EN 10132-4) vs C75S / 1.1248 (EN) (EN 10132-4)
| Element | C75S (EN) | C75S / 1.1248 (EN) | Overlap |
|---|---|---|---|
| C | 0.7–0.8% | 0.7–0.8% | OK |
| Si | 0.15–0.35% | 0.15–0.35% | OK |
| Mn | 0.6–0.9% | 0.6–0.9% | OK |
| P | 0–0.025% | 0–0.025% | OK |
| S | 0–0.025% | 0–0.025% | OK |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 1250–1500 | MPa |
| Yield Strength | 1100–1350 | MPa |
| Elongation | 4–7 | % |
| Hardness HRC | 58–62 | HRC |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Compatibility verdict
C75S and C75S / 1.1248: 100% 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.
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).
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