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
Mechanical properties — Pro
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
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| Elongation | ||
| Hardness HRC | ||
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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).
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S275JR
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