Wear-resistant cold-work tool steel — blanking and forming dies, shear blades, slitters. Semi-stainless (12% Cr).
| Property | Typical value |
|---|---|
| Density | 7700 kg/m³ |
| Hardness | Annealed ≤255 HB |
| Hardened | 58–62 HRC (air/vacuum harden + temper) |
| Young's E | 210 GPa |
| CTE | ~10.5 µm/m·K |
| Thermal cond. | ~20 W/m·K |
| Max service | ~200 °C (as normally tempered — state HT if higher needed) |
| Poisson ν | ~0.29 |
| Shear modulus G | ~81 GPa (derived) |
| Specific heat | ~460 J/kg·K |
| Elec. resistivity | — |
| Melting range | ~1400–1430 °C |
~30–40% annealed — hard carbides wear tooling; carbide inserts. Grind/EDM after hardening.
Not welded (specialist die repair only).
| System | Designation |
|---|---|
| EN | X153CrMoV12 / 1.2379 |
| DIN | X155CrVMo12-1 / 1.2379 |
| AISI | D2 |
| ASTM | A681 D2 |
| JIS | SKD11 |
| BS | BS 4659 BD2 |
| UNS | T30402 |
Equivalents & alternatives: BD2 / 1.2379 (X153CrMoV12); AISI D2. Alt: O1 (easier to work), PM grades (toughness), 440C (corrosion).
