M4
Data verifiedM4 raises carbon and vanadium to about 4% each over the M2 base, giving outstanding abrasive wear resistance among conventional (non-PM) high-speed steels. It is a premium choice for punches and heavy-duty cutters.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 1.25–1.40 |
| Si | ≤0.45 |
| Mn | ≤0.40 |
| Cr | 3.75–4.75 |
| Mo | 4.00–5.50 |
| W | 5.25–6.75 |
| V | 3.75–4.75 |
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 | 7.95 g/cm³ |
| Wear resistance | Very high (4% vanadium) |
Heat treatment
Preheat 845 °C; harden 1190–1230 °C; triple temper 540–560 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | — (HS6-5-4 family) |
| aisi | M4 |
| jis | SKH57 (near) |
| gb | W6Mo5Cr4V3 |
Compare side by side: M4 vs M2 · M4 vs T15
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Broaches, form tools, milling cutters, cold work punches and dies, gear hobs.
Processing: Hard to grind — CBN wheels and rigid machines help. PM versions improve grindability and toughness further.
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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.