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H-13 Air Hardening Tool Steel
H-13 is an air hardening, 5% chromium die steel, which is an excellent choice for a wide range of hot work and cold work applications. H-13 is widely used for aluminum, zinc, and magnesium die casting dies where resistance to thermal fatigue due to alternated heating and cooling cycles is of primary importance.
Analysis:
| C | CO | CR | MN | MO | NI | P | S | SI | V | W |
|---|
| 0.32 - 0.45 | 4.75 - 5.50 | 0.20 - 0.60 | 1.10 - 1.75 | 0.80 - 1.25 | 0.80 - 1.20 |
Size Availability:
Flats • Hollowbar • Metric • Non-Standard • Rounds • Squares • StandardApplications:
| Die Casting Dies | Dummy Blocks | Extrusion Dies - Hot |
| Forging Dies | Heading Dies - Hot | Heavy Shear Blades |
| Inserts | Mandrels | Piercing Tools - Hot |
| Plastic Mold Dies | Punches - Hot | Swaging Dies - Hot |
Designations:
AFNOR Z 40 COV 5 - FranceDIN 1.2344 - Germany
UNI KU - Italy
JIS SKD61 - Japan
SS 2242 - Sweden
B.S. BH 13 - United Kingdom
ASTM A681 - US
FED QQ-T-570 - US
SAE J437 - US
SAE J438 - US
SAE J467 - US
UNS T20813 - US
AISI H13 Tool Steel - US
| Treatment | Temperature Range | Cooling/Quenching | Notes |
|---|---|---|---|
| Forging | 2000-2100° F | Slow | Do not forge below 1650° F. Anneal after forging. |
| Annealing | 1560-1625° F | Cool slowly at a rate of 35° F per hour to a 1110° F. | Protect against surface decarburization using controlled atmosphere or by pack-annealing. Hold at temperature for 2 hours. |
| Stress Relieving | 1110-1300° F | Cool slowly in furnace to 930° F. Then in air. | |
| Preheating | 1400-1500° F | Preheat time in furnace is ¾ Hr. per inch of thickness. Heating up to temperature as slow as possible. | |
| Hardening | 1830-1900° F | To minimize distortion, air cool. For maximum hardness diameters greater than 6” should be quenched in oil. | Soak time is 30 minutes per inch of thickness. Minimum of 1 hour. Allow to cool to 125-150° F before tempering |
| Tempering | (See Chart) | In air. | Complete equalization of temperature throughout the tools is essential for good results. Double temper. Recommended temperature is 1000-1200° F. |