Heat Treating and Tempering information

8670

Hardening

Austenizing temperature - 1,550
Hold/Soak Time - 3-10 minutes
Expected Rc (as quenched) - 63-65

Oil Quench - Parks 50

Tempering

Temper twice for 2hrs.

300°F - 325°F - 62-63
375°F - 400°F - 61-62

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15N20

Hardening

Austenizing temperature - 1,450 to 1,480°F / 801°C
Hold/Soak Time - 5-15 minutes
Expected Rc (as quenched) - 64-65

Oil Quench

Tempering

Temper twice for 2hrs.

400°F / 204°C - 60-61
450°F / 232°C  - 57-58
500°F / 260°C  - 55-56

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80CRV2

Hardening

Austenizing temperature - 1,465 to 1480°F / 801°C
Hold/Soak Time - 5-15 minutes 
Expected Rc (as quenched) - 64-65

Oil Quench

Tempering

Temper twice for 2hrs.

350°F / 177°C - 63-64
400°F / 204°C - 60-61
450°F / 232°C - 57-58
500°F / 260°C - 55-56

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440C

Hardening

Pre-Heat/Equalizing - 1,425°F / 760°C (hold 15 minutes)
Austenizing temperature - 1,875°F / 1038°C Soak 30 minutes
Expected Rc (as quenched prior to cryo) - 59Rc (61 after Cryo)

Air Quench

Tempering

Temper twice for 2hrs.

300°F / 149°C - 60
400°F / 204°C - 59
500°F / 260°C - 57
600°F / 316°C - 56

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5160

Hardening

Austenizing temperature - 1,465 to 1480°F / 801°C
Hold/Soak Time - 5-15 minutes 
Expected Rc (as quenched) - 63-62

Oil Quench

Tempering

Temper twice for 2hrs.

350°F / 177°C - 62-61
400°F / 204°C - 60-59
450°F / 232°C - 57-58
500°F / 260°C - 55-56

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52100

Hardening

Austenizing temperature - 1,465 to 1480°F / 801°C 
Hold/Soak Time - 5-15 minutes 
Expected Rc (as quenched) - 64-65

Oil Quench

Tempering

Temper twice for 2hrs.

350°F / 177°C - 63-64
400°F / 204°C - 60-61
450°F / 232°C - 57-58
500°F / 260°C - 55-56

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A2

Hardening

Pre-Heat/Equalizing - 1,450°F / 787°C (hold 15 minutes) 
Austenizing temperature - 1,750°F / 954°C Soak 30 minutes
Expected Rc (as quenched prior to cryo) - 63Rc (64 after Cryo)

Air or Oil Quench

Tempering

Temper twice for 2hrs.

300°F / 149°C - 64
350°F / 177°C - 63
400°F / 204°C - 62
450°F / 232°C - 61
500°F / 260°C - 60
600°F / 316°C - 58

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CPM 154

Hardening

Pre-Heat/Equalizing - 1,400°F / 760°C (hold 15 minutes) 
Austenizing temperature - 1,950°F / 1065°C Soak 30 minutes
Expected Rc (as quenched prior to cryo) - 61Rc (63 after Cryo)

Air Quench

Tempering

Temper twice for 2hrs.

300°F / 149°C - 63
400°F / 204°C - 62
600°F / 316°C - 60

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O-1

Hardening

Austenizing temperature - 1,465 to 1480°F / 801°C
Hold/Soak Time - 20-30 minutes
Expected Rc (as quenched) - 64-65

Oil Quench

Tempering

Temper twice for 2hrs.

350°F / 177°C - 63-64
400°F / 204°C - 60-61
450°F / 232°C - 57-58
500°F / 260°C - 55-56

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W-2

Hardening

Austenizing temperature - 1,450 to 1,475°F / 801°C
Hold/Soak Time - 5-15 minutes
Expected Rc (as quenched) - 64-65

Oil Quench - Parks 50

Tempering

Temper twice for 2hrs.

350°F / 177°C - 63-64
400°F / 204°C - 60-61
450°F / 232°C - 57-58
500°F / 260°C - 55-56

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1084 / 1080 / 1075

Hardening

Austenizing temperature - 1,450 to 1,480°F / 801°C
Hold/Soak Time - 5-15 minutes
Expected Rc (as quenched) - 64-65

Oil Quench - Parks 50

Tempering

Temper twice for 2hrs.

350°F / 177°C - 63-64
400°F / 204°C - 60-61
450°F / 232°C - 57-58
500°F / 260°C - 55-56

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CPM MagnaCut

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.

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