WR-95
(AISI H10 Modified)
WR-95 is a modified H10, with cobalt added to improve its high temperature properties. It is an upgrade from H13 in applications requiring improved hot hardness or heat check resistance, at a slight decrease in toughness. It may be used at tool temperatures up to about 1100F, with brief exposures up to about 1200F.
Typical Chemistry
Carbon 0.35%
Manganese 0.30%
Silicon 0.90%
Chromium 3.50%
Molybdenum 2.50%
Vanadium 0.60%
Cobalt 2.00%
Typical Applications
Extrusion Tooling Forging Dies
Hot Upset Dies Die Casting Dies
Die Inserts
Hardening

Critical Temperature: about 1550F.

Preheat: 1100/1200F, equalize, 1400/1500F, equalize.

High Heat: 1850/1925F, hold 20/45 minutes at temperature.

Quench: Air, positive pressure vacuum, salt, or interrupted oil to 125/150F.

Temper: 1000/1200F, hold one hour per inch of thickness (two hours minimum. Temper three times.
Typical Properties
Air cooled from 1900F, triple tempered as shown.
Tempering
Temperature °F
 Hardness
HRC
 CVN
1000 58 9
1050 57 10
1100 54.5 12
1150 50.5 14
1200 40.5 15.5
Surface Treatments
Because of its high tempering temperatures (>1000 F), WR-95 may be treated by most surface treating processes, including conventional and ion nitriding, titanium nitriding, and other coatings or treatments. Nitrided surface hardness will be about 60/65 HRC.

Annealing
Heat to 1625F. Hold 2 hours at temperature. Cool slowly (40F per hour maximum) to 1200F, then air cool to room temperature.
or
Heat to 1650F. Hold 2 hours at temperature. Cool to 1350F. Hold 6 hours at temperature, then air cool to room temperature.

Typical annealed hardness - 207/241 BHN.

Stress Relieving
Annealed material - Heat uniformly to 1200/1250F, hold two hours at temperature, cool in still air to room temperature.
Hardened material - Heat uniformly to 25/50F below tempering temperature, hold two hours, cool in still air to room temperature.

Welding
Use H13 or other hot work tool steel filler material.
Annealed material - Preheat to 800/1000F. Maintain above 700F during welding. Reanneal, or temper 1350F 6 hours.
Hardened material - Preheat to 800/1000F. Maintain above 700F during welding. Allow to cool to hand warm (150F) after welding. Retemper at 25/50F below original tempering temperature (1000F minimum).

Physical Properties
Modulus of Elasticity ..............................................................30 x 106 psi
Density .....................................................................................0.283 lbs/in3
Thermal Conductivity ................200F ...............................15 BTU/hr/ft/°F
Thermal Expansion
        RT-200F .....................................................................6.3 x 10-6 in/in/°F
        RT-500F .....................................................................6.5 x 10-6 in/in/°F
        RT-800F .....................................................................6.7 x 10-6 in/in/°F
        RT-1000F ...................................................................7.1 x 10-6 in/in/°F
        RT-1200F ...................................................................7.4 x 10-6 in/in/°F
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