ISO S — Superalloys & Titanium · S20
S20 — Nickel superalloys (Inconel 718)
Hardness range: 280–380 HB. Part of the ISO S — Superalloys & Titanium group. Superalloys and titanium are the most challenging ISO group: low thermal conductivity concentrates heat at the cutting edge, and high strength persists at elevated temperatures. High-pressure coolant (70–100 bar) is mandatory. Low Vc, consistent DOC, and sharp geometry are non-negotiable. Tool life is short — plan changeovers.
Material profile — S20
- ISO designation
- S20 (ISO S — Superalloys & Titanium)
- Material
- Nickel superalloys (Inconel 718)
- Hardness
- 280–380 HB
- ISO group colour
- Superalloys & Titanium
Tooling guidance — S-group
- Group summary
- Most difficult ISO group. High-pressure coolant mandatory. Low Vc, consistent DOC, sharp positive geometry.
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