D2 Tool Steel vs H13 Tool Steel
D2 and H13 are tool steels built for opposite jobs. D2 is a high-carbon, high-chromium cold-work grade engineered for abrasive wear resistance in long-running dies. H13 is a chromium-molybdenum-vanadium hot-work grade designed to keep its strength and resist thermal fatigue at high temperatures. The split between cold-work wear and hot-work thermal endurance drives nearly every choice between them.
The verdict
Choose D2 for cold-work tooling where abrasive wear life and high hardness matter. Choose H13 for hot-work applications — die-casting dies, extrusion tooling, and forging dies — where parts must survive elevated temperatures and thermal cycling without softening or cracking.
Side-by-side data
| Property | D2 Tool Steel | H13 Tool Steel |
|---|---|---|
| Category | Steel | Tool Steel |
| Density (g/cm³) | 7.7 | 7.8 |
| Tensile strength (MPa) | 1900 | 1650 |
| Yield strength (MPa) | 1500 | 1380 |
| Elongation (%) | 8 | 9 |
| Hardness | 60 HRC | 50 HRC |
| Max service temp (°C) | 425 | 540 |
| Machinability | ●●●●● | ●●●●● |
| Corrosion resistance | ●●●●● | ●●●●● |
| Relative cost | ●●●●● | ●●●●● |
| Thermal cond. (W/m·K) | 20 | 25 |
| Typically used for | Dies, punches & wear tooling | Hot-work dies & die-casting molds |
Which should you choose?
Choose D2 Tool Steel when…
- The application is cold-work: blanking, forming, or stamping dies
- Abrasive wear resistance and high hardness (~60 HRC) are the priority
- Operating temperatures stay low and the tool is not thermally cycled
- High chromium carbides are needed for long die life on abrasive stock
- Higher hardness matters more than impact toughness for the part
- You want a proven, economical long-run cold-work die steel
Choose H13 Tool Steel when…
- The tool runs hot: die casting, hot extrusion, or forging dies
- Resistance to thermal fatigue and heat checking is essential
- Service temperatures reach up to ~540C without losing strength
- Toughness and shock resistance matter under thermal-mechanical cycling
- The die contacts molten or hot metal and must resist softening
- Better elongation (~9%) helps survive repeated heating and cooling
Key differences that matter
- D2 is a cold-work grade; H13 is a hot-work grade — this dictates almost every selection decision
- H13 has a much higher service temperature (max_temp ~540C vs D2's ~425C) and resists thermal softening and heat checking
- D2 reaches higher hardness (~60 vs 50 HRC) and tensile (~1900 vs 1650 MPa), favoring abrasive wear resistance
- H13 has greater toughness and higher elongation (~9% vs 8%), important for surviving thermal-mechanical fatigue
- D2's high chromium carbides excel at cold abrasive wear but would not survive repeated thermal cycling like H13
- Both air-harden, but H13 is heat-treated to a lower hardness to retain the toughness hot-work dies need
- H13 carries a higher cost index (3.2 vs 2.5), reflecting its specialized hot-work alloying
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Open the Material SelectorGet a Quote →Frequently asked questions
Why can't I use D2 for die-casting molds?
D2 is a cold-work steel that loses hardness and cracks under the repeated heating, cooling, and molten-metal contact of die casting. H13 is specifically alloyed with chromium, molybdenum, and vanadium to resist thermal softening and heat checking up to about 540C, which is why it dominates die-casting and hot-work tooling.
Which is harder, and does that matter?
D2 is harder, around 60 HRC versus H13's typical 50 HRC. For cold abrasive wear that extra hardness extends die life. But in hot-work service, toughness and thermal-fatigue resistance matter more than peak hardness, so H13 is deliberately run softer to avoid cracking under thermal stress.
Is H13 tougher than D2?
Yes. H13 is formulated and heat-treated for toughness and resistance to thermal-mechanical fatigue, giving it better impact resistance and slightly higher elongation than D2. D2's high carbide content makes it harder and more wear resistant but more brittle, so it is reserved for wear-dominated cold-work tooling.
Do both harden in air?
Yes, both are air-hardening tool steels, which minimizes distortion during heat treatment. The key difference is target hardness: D2 is hardened high for wear resistance, while H13 is tempered back to retain the toughness and thermal-fatigue resistance demanded by hot-work dies. Their service environments, not the quench, separate them.
Property values are typical/nominal figures for early-stage guidance only and vary by temper, grade, supplier and heat treatment. Confirm critical specifications against a certified datasheet or with an mfgiq engineer before production.