M7
Data verifiedM7 is the high-carbon, higher-vanadium development of M1, tuned for deep-hole drills and tools that need maximum edge hardness from a molybdenum high-speed steel.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.97–1.05 |
| Si | ≤0.55 |
| Mn | ≤0.40 |
| Cr | 3.50–4.00 |
| Mo | 8.20–9.20 |
| W | 1.40–2.10 |
| V | 1.75–2.25 |
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 | 7.90 g/cm³ |
Heat treatment
Preheat 845 °C; harden 1190–1230 °C; triple temper 540–570 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | — (HS2-9-2 family) |
| aisi | M7 |
| gb | W2Mo9Cr4V2 (near) |
Compare side by side: M7 vs M1 · M7 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: Deep-hole and gun drills, taps, end mills, reamers for abrasive materials.
Processing: As M1; the extra carbon demands careful hardening to avoid retained austenite — full triple tempering is essential.
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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.