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 10132-4) vs C75S / 1.1248 (EN) (EN 10132-4)
| Element | C75S (EN 10132-4) | C75S / 1.1248 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.7–0.8% | — |
| Si | — | 0.15–0.35% | — |
Mechanical properties
Compatibility verdict
C75S and C75S / 1.1248: 100% composition match
Related materials
C45
1.0503Medium carbon unalloyed quality steel. Good machinability and moderate strength after heat treatment. Widely used for shafts, spindles, pins, studs, and general machine parts.
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).
S235JR
1.0038General-purpose structural steel with minimum yield strength of 235 MPa. The most common structural steel grade in Europe for general construction, frames, and non-critical structural applications.
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