M36
Data under reviewM36 applies the 8% cobalt treatment to the M2 base composition, giving red hardness close to M42 with a slightly different carbide balance. It is an older American cobalt grade still specified for heavy cutting tools.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.80–0.90 |
| Si | ≤0.45 |
| Mn | ≤0.40 |
| Cr | 3.75–4.50 |
| Mo | 4.50–5.50 |
| W | 5.50–6.50 |
| V | 1.75–2.25 |
| Co | 7.75–8.75 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Annealed |
| Hardness (hardened) | 63–66 HRC |
| Density | 8.10 g/cm³ |
| Red hardness | High (8% cobalt) |
Heat treatment
Preheat 850 °C; harden 1190–1230 °C; triple temper 540–560 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | M36 |
| gb | W6Mo5Cr4V2Co8 (near) |
Compare side by side: M36 vs M35 · M36 vs M42 · M36 vs M2
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Milling cutters, drills and broaches for high-strength steels, heavy-duty lathe tools.
Processing: As other cobalt HSS: protect against decarburization, grind with CBN for best results.
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Ask for a quotationVisit NasteelSource: ASTM A600 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.