CRUCIBLE 161
Similar to High Carbon H13
Crucible 161 is a high carbon modification of H13, intended for applications requiring higher hardness, compressive strength, wear resistance, or tempering resistance (hot hardness), at slightly lower toughness. It may be used at tool temperatures up to about 1000 F, with brief exposures up to 1100 F.
Typical Chemistry
Carbon 0.50%
Manganese 0.40%
Silicon 1.00%
Chromium 5.00%
Molybdenum 1.60%
Vanadium 1.10%
Typical Applications
Forging Dies Die Inserts
Hot Upset Dies Piercing Punches
Extrusion Tooling Plastic Injection Molds
Shear Blades Knives

Hardening

Preheat: 1100/1250F, equalize, 1450/1500, equalize.

High Heat: 1800/1900F, hold 15/45 minutes at temperature.

Quench: Air, positive pressure vacuum to 150F.

Temper:
1000/1200F, hold 2 hours, air cool to room temperature. Temper twice.
Typical Hardness
Air cooled from temperature indicated, double tempered.

Tempering
Temperature °F
Hardness HRC
(1900F)
(1800F)

1000 56.5 55.6
1050 52.5 52.5
1100 48.5 48.5
1150 44.5 44.5
1200 32.5 32.5

Surface Treatments
Because of its high tempering temperature (>1000F), Crucible 161 may be treated by most surface treatment processes. Nitrided surfaces will typically be 60/70 HRC.

Annealing
Heat to 1625F, hold two hours, cool slowly (50F/hr maximum) to 1200F, then air cool.
Typical Annealed Hardness: 197/229 BHN

Stress Relieving
Annealed Material: Heat to 1200/1250F, hold two hours, cool in still air.
Hardened Material: Heat to 25/50F below tempering temperature, hold two hours, cool in still air.

Welding

Use hot work tool steel filler material, similar to H13.
Annealed Material: Preheat to 800/1000F. Maintain above 800F during welding. Reanneal or temper 1400F 6 hours.
Hardened Material: Preheat to 800/1000F. Maintain above 800F during welding. Cool to 150F after welding. Temper 25/50F below original tempering temperature.

Physical Properties
Modulus of Elasticity ..................................................................30 psi x 106
Density ............................................................................................0.281 lb/in
3
Thermal Conductivity ........................ (200F)....................14.5 BTU/hr/ft/°F
Thermal Expansion
                           RT-400F......................................................6.4 x 10-6 in/in/°F
                           RT-800F......................................................6.8 x 10-6 in/in/°F
                           RT-1200F....................................................7.3 x 10-6 in/in/°F
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