M1
Data verifiedM1 is a molybdenum high-speed steel with the tungsten mostly replaced by about 8.7% molybdenum, making it tougher than T1 at equal hardness. It was developed for drills and taps where T-series steels chipped.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.78–0.88 |
| Si | ≤0.50 |
| Mn | ≤0.40 |
| Cr | 3.50–4.00 |
| Mo | 8.20–9.20 |
| W | 1.40–2.10 |
| V | 1.00–1.35 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Annealed |
| Hardness (hardened) | 62–65 HRC |
| Density | 7.90 g/cm³ |
| Red hardness | Good |
Heat treatment
Preheat 730–845 °C; harden 1175–1220 °C salt/oil/air; triple temper 540–595 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | — (HS9-2-1 family) |
| aisi | M1 |
| jis | SKH55 (near) |
| gb | W2Mo9Cr4V (near) |
Compare side by side: M1 vs M2 · M1 vs M7
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Twist drills, taps, reamers, milling cutters, punches.
Processing: Slightly more decarburization-sensitive than T1 — salt bath or vacuum hardening preferred.
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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.