CPM MagnaCut Stainless Blade Steel - Heat Treatment Recipe
Thermal Treatments:
Forging: 2100°F (1150°C) Do not forge below 1750°F (950°C). Annealing: Heat to 1650°F (900°C), hold 2 hours, slow cool no faster than 25°F (15°C) per hour to 1100°F (595°C), then furnace cool or cool in still air to room temperature.
Annealed Hardness: About BHN 235
Stress Relieving
Annealed Parts: Heat to 1100-1300°F (595-705°C), hold 2 hours, then furnace cool or cool in still air.
Hardened Parts: Heat to 25-50°F (15-30°C) below original tempering temperature, hold 2 hours, then furnace cool or cool in still air.
Straightening: Best done warm 400-800°F (200-425°C)
Hardening:
Preheat: Heat to 1550-1600°F (845-870°C) Equalize.
Austenitize: 1950-2200°F (1065-1205°C), hold time at temperature as shown in chart. Thick cross-sections and larger pieces may need longer austenitizing time.
Quench: Plate quench, air or positive pressure quench (2 bar minimum) to below 125°F (50°C), or salt or interrupted oil quench to about 1000°F (540°C), then air cool to below 125°F (50°C).
Cold Treatment: A cold treatment may be used after the quench to decrease retained austenite and increase hardness. Tempering before the cold treatment decreases the effectiveness of the cold treatment but also decreases the chance of warping or cracking. A freezer treatment at -10°F (-23°C) has no effect unless performed directly after the quench with no delay.
Temper: Double temper at 300-450°F (150-230°C). Hold for 2 hours minimum each time.
NOTE: Tempering above 750°F (400°C) results in a decrease in corrosion resistance.
Size Change: +0.05 to +0.10% when fully martensitic. The presence of retained austenite may reduce the net growth. When tempering at 300-750°F (150-400°C), freezing treatments may be necessary to minimize retained austenite.
Recommended Heat Treatment:
Austenitize 2050°F (1120°C). Quench to below 125°F (50°C). Double temper at 350°F (175°C) 2 hrs. minimum each temper. Cool to hand warm between tempers. A freeze treatment may be added after the quench. Aim hardness: 60-63 HRC.
Note: Properties shown throughout this data sheet are typical values. Normal variations in chemistry, size and heat treat conditions may cause deviations from these values.
Austenitizing - Plate/Oil Quench to Room Temperature
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Min Aust time
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30 min
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25 min
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20 min
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15 min
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10 min
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5 min
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Temper
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1950°F (1065°C)
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2000°F (1095°C)
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2050°F (1120°C)
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2100°F (1150°C)
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2150°F (1175°C)
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2200°F (1205°C)
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300°F (150°C)
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60.5
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62
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62.5
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63
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63.5
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63
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350°F (175°C)
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59.5
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60.5
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61.5
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61.5
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62
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61.5
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400°F (205°C)
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58.5
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59.5
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60
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60.5
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60.5
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60.5
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500°F (260°C)
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57.5
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58.5
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58.5
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59
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60
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59.5
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1000°F (538°C)
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57
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58.5
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59.5
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60.5
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61.5
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62
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Freezer (-10°F after Plate/Oil Quench)
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300°F (150°C)
|
61
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62
|
63
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63.5
|
64
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64.5
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350°F (175°C)
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59.5
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60.5
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61.5
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62.5
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63
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63.5
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400°F (205°C)
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58.5
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59.5
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60
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61.5
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62
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62
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500°F (260°C)
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58
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58.5
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59
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60
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60.5
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61
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Liquid Nitrogen or Dry Ice after Plate/Oil Quench
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300°F (150°C)
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60.5
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62
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63
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64
|
64.5
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65
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350°F (175°C)
|
59.5
|
61
|
62
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62.5
|
63.5
|
64
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400°F (205°C)
|
58.5
|
60.5
|
61
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62
|
62.5
|
63.5
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500°F (260°C)
|
57.5
|
59
|
59
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60
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60.5
|
62
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1000°F (538°C)
|
56
|
|
59
|
|
60.5
|
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Vacuum Furnace – 2 Bar Quench
|
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No Cryo
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With Cryo
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Temper
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1950°F (1065°C)
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2050°F (1120°C)
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2150°F (1175°C)
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1950°F (1065°C)
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2050°F (1120°C)
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2150°F (1175°C)
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300°F (150°C)
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59.5
|
62
|
62.5
|
61
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62.5
|
64
|
350°F (175°C)
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58.5
|
60.5
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61.5
|
59
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61.5
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63
|
400°F (205°C)
|
58
|
59.5
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60
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58.5
|
61
|
62
|
500°F (260°C)
|
56.5
|
58
|
58.5
|
|
|
|
960°F (515°C)
|
58.5
|
61
|
62
|
|
|
|
Results may vary with hardening method and section size.
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Suggested heat treatment is based on the recommended specifications for use in ovens, high temp salts, and similarly, properly calibrated equipment; and in line with proper industrial standards for quenching. Deviation from industry standards for schedules, equipment, quenching mediums; and hardness testing equipment may result in varied results. The supplied information on this page is on a generalized scale with the above mentioned standards and methods, which is why soak times and similar aspects may vary in time length to include a margin for the available heat treating equipment and steel cross section.
If you are unsure if you have the necessary means to heat treat on-site, we recommend professional heat treating services provided by Rob Ridley at HeatTreat.ca or 403 556 1113.
CKMS Ltd. is not liable or responsible if proper industry heat treating protocols are not applied; particularly and especially if sending to an independent heat treat provider if they do not follow the intended heat treat schedule or standards for that particular steel; or damage they cause while in their possession.
To view CPM MagnaCut Stainless Blade Steel product description, click here.
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