H13 Tool Steel
Chromium hot-work steel, most widely used tool steel for hot and cold tooling due to toughness and fatigue resistance.
Chemical Composition
| Element | Percentage (% by weight) |
|---|---|
| Cr | 4.75 - 5.5 |
| Mo | 1.1 - 1.75 |
| Si | 0.8 - 1.2 |
| V | 0.8 - 1.2 |
| C | 0.32 - 0.45 |
| Ni | max 0.3 |
| Cu | max 0.25 |
| Mn | 0.2 - 0.5 |
| P | max 0.03 |
| S | max 0.03 |
Physical Properties
- Density (kg/m³)
- 7800
- Melting point (°C)
- 1427
Mechanical Properties
- Tensile strength (MPa)
- 1200 to 1590
- Yield strength (MPa)
- 1000 to 1380
- Reduction of area (%)
- 50
- Elastic modulus (GPa)
- 215
Thermal Properties
- Thermal expansion (/°C)
- 10.4e-6 (20-100C)
- Thermal conductivity (W/m·K)
- 28.6
Also known as
Direct equivalents
Same material sold under a different naming standard.
Heat Treatment
- Hardening
- preheat to 816C
- Machinability
- ~75% of W-group tool steels
- Welding
- readily weldable
Typical Applications
- Die casting dies
- Extrusion dies
- Hot forging tooling
- Hot shearing
- Plastic molds
Buying This Grade in Pakistan
The standard hot-work grade for die-casting and forging dies made in Karachi and Lahore tool rooms, including work tied to KTDMC's automotive tooling mandate in Korangi. Sourced as imported bar stock, typically from European, Japanese, or Chinese specialty mills, since it isn't rolled domestically.
Related reading
- Steel grades for Karachi's tool and die shops: D2, H13, K100, P20 compared
A buyer's guide to the four main tool and mold steel grades Karachi's die shops order, and how to tell which one a job actually needs.
- H13 vs D2: choosing between hot-work and cold-work tooling
A practical comparison of H13 and D2 tool steel for Pakistani die shops: when each one is the right call and why swapping them fails.
- D2 tool steel: composition, hardness, and why Karachi's tool rooms default to it
What D2 tool steel is made of, how hard it gets, and why it's the default cold-work grade in Karachi's die shops.
Grade Family
Chromium hot-work tool steel (Group H)
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