PROPRIETARY CPM 20CV Stainless steels
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PROPRIETARY CPM 20CV Chemical Composition
Latrobe Specialty Steel, Product Data Sheets,
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PROPRIETARY CPM 20CV Physical Properties
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PROPRIETARY CPM 20CV Heat Treatments
- Hardening:
Preheating: Heat to 760-788°C (1400-1450°F) and equalize.
Austenitizing (High Heat): Heat rapidly from the preheat to a temperature to within 1071-1177°C (1960-2150°F). A lower austenitizing temperature will maximize impact toughness. A higher austenitizing temperature will maximize wear resistance and corrosion resistance. Soak at the austenitizing temperature for 30 minutes.
Quenching: Pressurized gas or warm oil. For pressurized gas, the furnace should have a minimum quench pressure of 4 bars. A quench rate of approximately 222°C (400°F) per minute to below 538°C (1000°F) is critical to obtain the desired properties. For oil, quench until black, about 482°C (900°F), then cool in still air to 66-51°C (150-125°F).
Cryogenic treatment: For austenitizing at 1149°C (2100°F) or higher, a cryogenic treatment is recommended after quenching to 66-51°C (150 to 125°F) to reduce retained austenite. Cool to -73°C (-100°F), remove from the cooling medium, and allow part to warm to ambient temperature in still air.
Tempering: Temper immediately after quenching, or after quenching and cryogenic treatment. Typical temperature range is 204-427°C (400-800°F). Hold at temperature for 1 hour 25.4 mm of thickness, 2 hours minimum, then air cool to ambient temperature. The typical service hardness is 56-59 HRC, although higher hardness may be used for increased wear resistance. Tempering between 427-583°C (800-1100°F) will decrease corrosion resistance and toughness.
Annealing: Annealing must be performed after hot working and before re-hardening. Heat at a rate not exceeding 222°C per hour (400°F per hour) to 1016-1038°C (1860-1900°F), and hold at temperature for 1 hour per 25.4 mm of maximum thickness, 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 17°C per hour (30°F per hour) to 538°C (1000°F). Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be approximately 30 HRC or lower.
PROPRIETARY CPM 20CV Mechanical Properties
Temperature
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PROPRIETARY CPM 20CV International Equivalent Materials
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