AISI H13 Hot Work Tool Steel: Die Casting & Forging Dies
ASTM A681 · Updated: 2026-05-25
AISI H13 is the most widely used hot work tool steel with 0.32-0.45% C, 4.75-5.50% Cr, 1.10-1.75% Mo, and 0.80-1.20% V. Its balanced composition provides exceptional hot hardness, thermal fatigue resistance, and toughness at temperatures up to 540°C. Industry standard for aluminum die casting dies, extrusion tooling, forging dies, and injection molds. Achieves 48-52 HRC after austenitizing at 1,020-1,050°C, oil or air quenching, and double tempering at 540-600°C. Secondary hardening from Mo and V carbide precipitation provides excellent resistance to heat checking.
Quick Facts
| Category | Tool Steel |
| Standard | ASTM A681 |
| Density | 7.80 g/cm³ |
| Yield Strength | 1,380 MPa (200 ksi) at 48-50 HRC |
| Tensile Strength | 1,580 MPa (229 ksi) at 48-50 HRC |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| EN X40CrMoV5-1 | Compare |
| DIN 1.2344 | Compare |
| SKD61 | Compare |
| 4Cr5MoSiV1 | Compare |
| JIS SKD61 | Compare |
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Frequently Asked Questions
What causes H13 die failure and how can it be prevented?
Common failures: heat checking (thermal fatigue), gross cracking (improper preheating), and erosion from molten aluminum. Prevention: preheat dies to 150-260°C before operation, stress-relieve at 550°C after every 5,000-10,000 shots, ensure adequate fillet radii, and use proper die lubrication and cooling.