C100S
1.1274Highest-carbon unalloyed spring/tool steel — C 0.95-1.05%. Maximum hardness (HRC 63-66) in the unalloyed range. On the boundary between spring steel and tool steel. Used for flat springs requiring absolute maximum hardness, doctor blades, cutting tools, cold stamping dies, and wood-working saw blades. Also known as Silberstahl (silver steel) in wire form.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI W1 (approximate) | — | REF |
| 🇪🇺 | EN | Europe | C100S / 1.1274 | 1.1274 | 100% |
Sources: ASTM A29, EN 10132-4
Chemical composition comparison (wt%)
Side-by-side: C100S (EN 10132-4) vs C100S / 1.1274 (EN) (EN 10132-4)
| Element | C100S (EN 10132-4) | C100S / 1.1274 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.95–1.05% | — |
| Si | — | 0.15–0.35% | — |
Mechanical properties
Compatibility verdict
C100S and C100S / 1.1274: 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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