D4
Data verifiedD4 is a deep-hardening high-carbon, high-chromium cold work steel with molybdenum and vanadium added to the D3 base chemistry. It keeps D3-class abrasion resistance while hardening through much thicker sections.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 2.10–2.35 |
| Si | 0.10–0.60 |
| Mn | 0.20–0.60 |
| Cr | 11.00–13.00 |
| Mo | 0.70–1.20 |
| V | 0.80–1.20 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Annealed |
| Hardness (hardened) | 58–63 HRC |
| Density | 7.70 g/cm³ |
| Wear resistance | Extreme |
Heat treatment
Harden 960–1010 °C air/oil; temper 200–260 °C (or ~500 °C secondary). Deep hardening in large sections.
Equivalent grades
| Standard | Designation |
|---|---|
| din | — (X210CrMo12 family) |
| aisi | D4 |
| jis | SKD2 (near) |
| gb | Cr12Mo (near) |
Compare side by side: D4 vs D3 · D4 vs 1.2436 (D6) · D4 vs D7
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Deep-drawing dies, brick molds, thread rolling dies, large blanking dies, powder briquetting tools.
Processing: Grind with care; carbide banding in large sections is normal. Low toughness — avoid impact loading.
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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.