Details
The material composition by weight is:
- Iron (84.463-90%)
- Carbon (0.16-0.35%)
- Manganese (0.85%)
- Silicon (max. 1.25%), stabilizes the austenite phase, enhances toughness
- Chromium (max. 1.50-3.25%), enhances strength and hardenability
- Molybdenum (max. 0.55%), enhances hardenability
- Nickel (5.00%), increases toughness
- Tungsten (0.70-3.25%), enhances strength and wear resistance
- Vanadium (0.05-0.3%), increases toughness
- Copper (0.50%)
- Phosphorus (impurity, max. 0.015%)
- Sulfur (impurity, max. 0.012%)
- Calcium (max. 0.02%), sulfur control agent
- Nitrogen (impurity, max. 0.14%)
- Aluminium (max. 0.05%)
The material has an unusually wide range of production methods for a superalloy: electric arc, ladle refined with vacuum treatment; vacuum induction melting; vacuum arc remelting, and even electro slag remelting. Vacuum treatments are recommended for best strength and premium uses.
The material has to undergo heat treatment involving normalization, quenching and tempering to develop the required austenitic microstructure, with subsequent tempering. Test plates were 1 inch. First they were normalized. They were charged in a furnace at 500F. Heated at 125F per hour to 1625-1725F. Held at 1750F for an hour per inch of section size, and then air-cooled to room temperature. Next the samples were austenized by repeating the process up to 1700F, and held for an hour per inch of section size, then oil quenched to below 125F. Finally, they were tempered by in an oven that started below 500F, increased at 100F per hour per inch of section size, and allowed to air-cool to room temperature.
Read more about this topic: Eglin Steel
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