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Process hot rolled or hot forged
Delivery Condtion annealed
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A6 tool steel is a medium-alloy, air-hardening tool steel that is characterized by its ability to be through hardened while using the low austenitizing temperatures which are typically associated with oil-hardening tool steels. It exhibits good toughness and excellent dimensional stability in heat treatment. A6 is intermediate in wear resistance between o1 oil-hardening tool steel and d2 high-carbon, high-chromium tool steel.
blanking and forming dies, trim dies, bending and forming tools, mandrels, chuck jaws, tooling for plastic injection molding, dowel pins, shear knives, and gauges
Grade | C | Mn | P Max | S Max | Si | Cr | Mo |
A6 | 0.65 to 0.75 | 1.80 to 2.50 | 0.030 | 0.030 | 0.10 to 0.70 | 0.90 to 1.40 | 0.90 to 1.40 |
Properties | Metric | Imperial |
Machinability(based on carbon tool steel) | 65% | 65% |
Shear modulus(typical for steels) | 80.0 Gpa | 11600ksi |
Poisson's ratia | 0.27-0.30 | 0.27-0.30 |
Elastic | 190-210 GPa | 27557-30457 ksi |
Heating for forging must be done slowly and uniformly. Soak through at 1900°-2000°F and reheat as often as necessary, stopping work when the temperature drops below 1600°F. After forging, cool slowly in lime, mica, dry ashes or furnace. A6 should always be annealed after forging.
Heat slowly to 1350°-1375°F, hold until entire mass is heated through, and cool slowly in the furnace (20F per hour) to about 1000°F, after which cooling rate may be increased. Suitable precautions must be taken to prevent excessive carburization or decarburization.
When desirable to relieve the strains of machining, heat slowly to 1050°-1250°F, allow to equalize, and then cool in still air (Strain Relieving).
Parts at room temperature or as pre-heated should be placed in a hardening furnace operating at 1525°-1600°F. After parts have reached the furnace temperature, hold 20 minutes for small parts and up to 45 minutes for large parts
A6 is a deep hardening tool steel and will reach full hardness by cooling in freely circulating air.
A single temper (one hour at temperature for small pieces; proportionately longer time for larger sizes) is usually all that is required with tempering carried out in the range of 300°-1000°F. For most applications, the best combination of hardness and toughness is accomplished at 350°-400°F. Specimens 1 inch square by 3 inches long were air hardened from 1550°F and tempered at various temperatures for two hours.
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