DC53
Modified D2 cold-work tool steel developed by Daido Steel (Japan). Refined Cr-Mo-V composition with higher tempering temperature capability gives ~2x the toughness of standard D2 at equal hardness (62-63 HRC). Used as D2 replacement for progressive dies, blanking tools, and cold forging where chipping is a problem.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇯🇵 | Daido | Japan | DC53 | — | REF |
| 🇺🇸 | AISI | USA | AISI D2 (improved) | — | 80% |
Sources: Daido Steel, ASTM A681
Chemical composition comparison (wt%)
Side-by-side: DC53 (DAIDO) (Daido Steel) vs AISI D2 (improved) (AISI)
| Element | DC53 (DAIDO) | AISI D2 (improved) (AISI) | Overlap |
|---|---|---|---|
| C | 0.95% | — | — |
| Si | 0–1% | — | — |
| Mn | 0–0.4% | — | — |
| Cr | 8% | — | — |
| Mo | 2% | — | — |
| V | 0.3% | — | — |
Mechanical properties
Hardened Tempered
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | 62–63 | HRC |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.87 | g/cm3 |
Annealed
| Property | Value | Unit |
|---|---|---|
| Hardness HB | ≤ 255 | HB |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| quenching | 1020–1040 °C | air | 20-40 min | Air hardening. Higher austenitize temp than D2. |
| tempering | 180–530 °C | air | 1 hour x2 | Key advantage: 520°C temper gives 62 HRC (D2 drops to ~58 at same temp). Double/triple temper. |
| annealing | 830–870 °C | furnace | 3-5 hours | Slow furnace cool |
Compatibility verdict
DC53 and AISI D2 (improved): 80% composition match
Close equivalents but NOT identical.
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