O1 / 100MnCrW4
1.2510Oil-hardening cold-work tool steel. Good balance of wear resistance, toughness, and machinability at moderate cost. Very predictable heat treatment response. The standard choice for hand tools, gauges, jigs, fixtures, taps, reamers, and general precision tooling.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI O1 | T31501 | REF |
| 🇪🇺 | EN | Europe | 100MnCrW4 | 1.2510 | 100% |
| 🇯🇵 | JIS | Japan | SKS3 | — | 90% |
Sources: ASTM A681, EN ISO 4957, JIS G4404
Mechanical properties — Pro
Hardened Tempered
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | ||
| Elastic Modulus | ||
| Density |
Annealed
| Property | Value | Unit |
|---|---|---|
| Hardness HB |
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P20 / 40CrMnMo7
1.2311Pre-hardened plastic mold steel (usually delivered at 28-34 HRC). The most widely used mold base steel globally. Good machinability in pre-hardened condition, good polishability. Used for injection molds, die-casting dies, extrusion tooling, and structural mold components.
M2 / HS6-5-2
1.3343The most widely used high-speed steel worldwide. W-Mo-Cr-V composition gives excellent red hardness (cuts at temperatures up to 600°C). Used for twist drills, end mills, taps, reamers, bandsaw blades, and general-purpose cutting tools. The benchmark HSS grade.
X45NiCrMo4
1.2767Nickel cold-work tool steel with exceptional toughness from ~4% Ni content. Excellent through-hardenability, polishability, and impact resistance. Used for plastic injection molds (high-gloss), embossing dies, scrap shear blades, punches, cutlery dies, and bending tools.
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