40CrMnMoS8-6
1.2312Free-machining variant of 40CrMnMo7 (1.2311/P20) — sulfur addition (0.05-0.10%) for significantly improved machinability. Same pre-hardened delivery condition (28-32 HRC). 30-40% faster machining than 1.2311. Slight trade-off in polishability due to MnS inclusions. Used where machining cost matters more than mirror polish: large mold frames, structural mold components, and prototype molds.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | P20+S (modified) | — | REF |
| 🇪🇺 | EN | Europe | 40CrMnMoS8-6 / 1.2312 | 1.2312 | 100% |
Sources: ASTM A681, EN ISO 4957
Mechanical properties — Pro
Pre-hardened (delivered)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Hardness HRC | ||
| Elastic Modulus | ||
| Density |
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