C85S
1.1269Highest-carbon unalloyed spring strip steel — C 0.83-0.90%. Maximum achievable hardness (HRC 62-65) and fatigue strength in the cold-rolled spring strip series. Used for the most demanding flat spring applications where maximum hardness is critical: saw blades, scraper blades, precision springs, and high-frequency reed valves. Higher C than C67S (0.65-0.72%) and C75S (0.70-0.80%).
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1085 (approximate) | — | REF |
| 🇪🇺 | EN | Europe | C85S / 1.1269 | 1.1269 | 100% |
Sources: ASTM A29, EN 10132-4
Mechanical properties — Pro
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Hardness HRC | ||
| Elastic Modulus | ||
| Density |
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