D7
Data under reviewD7 combines maximum carbon and chromium with about 4% vanadium, giving the highest abrasive wear resistance of any conventional cold work steel. It is the last step before cemented carbide.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 2.15–2.50 |
| Si | 0.10–0.60 |
| Mn | 0.10–0.60 |
| Cr | 11.00–13.50 |
| Mo | 0.70–1.00 |
| V | 3.80–4.40 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Annealed |
| Hardness (hardened) | 58–64 HRC |
| Density | 7.70 g/cm³ |
| Wear resistance | Highest of the standard cold work steels |
Heat treatment
Harden 1010–1050 °C air; temper 200–290 °C, or 500–520 °C for secondary hardening.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | D7 |
Compare side by side: D7 vs D3 · D7 vs A7 · D7 vs D4
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Brick, tile and ceramic dies, ore and sand processing parts, powder compaction, dies for silicon steel and abrasive laminates.
Processing: Extremely difficult to machine and grind; EDM and CBN grinding are the norm. Very brittle — generous radii and supported sections are essential.
FAQ
- D7 or carbide?
- D7 is tougher and far cheaper than carbide and welds/machines (with difficulty) on normal shop equipment; carbide still outlasts it several times over in pure abrasion.
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Ask for a quotationVisit NasteelSource: ASTM A681 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.