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40CrMnMoS8-6

1.2312
tool_steelplastic_mold
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Free-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

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAP20+S (modified)—REF
🇪🇺ENEurope40CrMnMoS8-6 / 1.23121.2312100%

Sources: ASTM A681, EN ISO 4957

Chemical composition comparison (wt%)

Side-by-side: 40CrMnMoS8-6 (EN ISO 4957) vs 40CrMnMoS8-6 / 1.2312 (EN) (EN ISO 4957)

Element40CrMnMoS8-6 (EN ISO 4957)40CrMnMoS8-6 / 1.2312 (EN)Overlap
C—0.35–0.45%—
Si—0.2–0.4%—

Mechanical properties

Compatibility verdict

40CrMnMoS8-6 and 40CrMnMoS8-6 / 1.2312: 100% composition match

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