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Description:
A8 is a medium carbon, air-hardening tool steel that is characterized by a combination of very good toughness, intermediate wear resistance, and excellent dimensional stability in heat treatment. Has been used for punches that operate in the 55 to 60 Rockwell C hardness range. For hot work toolling applications, A8 tool steel provides better resistance to erosion, wear and wash-out then the typical chromium-molybdenum hot work steels such as H11 and H13. This alloy is not recommended for hot applications where thermal fatigue (heat checking) is the primary failure mode.
GRADE(%) |
C |
Cr |
Mn |
Mo |
P/S |
Si |
W |
A-8 |
0.50-0.60 |
4.75-5.5 |
0.2-0.5 |
1.15-1.65 |
<=0.030 |
0.75-1.00 |
1.00-1.50 |
Preheating:
Heat at a rate not exceeding 400°F per hour to 1400-1450°F and equalize.
Austenitizing:
Heat slowly from the preheat. Furnace or Salt: 1825-1850°F Soak for 30 minutes for the first inch of thickness, plus 15 minutes for each additional inch.
Quenching:
Air, pressurized gas, or interrupted oil to 150-125°F. Note: Sizes over 5 inches in cross section may not achieve full hardness by cooling in still air. It is usually necessary to increase the quench cooling rate between 1400 to 900°F by using an air blast, pressurized gas, or an interrupted oil quench. For the oil quench, quench
Tempering
Temper immediately after quenching. Hold temperature for 1 hour per inch of thickness, 2 hours minimum, then air cool to ambient temperature. The typical tempering range is 300 to 600°F. Double tempering is recommended for tempering temperatures of 900°F and higher. To minimize internal stresses in cross sections greater than 6 inches and to improve stability in tools that will be EDM’d after heat treatment, a soaking time of 4 to 6 hours at the tempering temperature is strongly recommended. Cryogenic Treatment: Some prefer to do cryogenic treatment as an extension of the quench from the austenitizing treatment. Others prefer to cryogenically treat after tempering.
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