CPM® 15V
CPM 15V is Crucible’s highest vanadium, abrasion resistant CPM tool steel. It contains 50% more hard vanadium carbides in its microstructure than CPM 10V, to provide even higher wear resistance.
    CPM 15V is intended for applications requiring exceptional wear resistance. Applications where CPM 10V is successful, but even longer tool life is desired, or applications where sintered carbide tooling is prone to fracture or difficult to fabricate, are likely to be well-served by CPM 15V.
Typical Chemistry
Carbon 3.40%
Manganese 0.50%
Silicon 0.90%
Chromium 5.25%
Vanadium 14.50%
Molybdenum 1.30%
Sulfur 0.07%
Typical Applications
Powder Compaction Tooling:
    Punches, Dies, Core Rods
Plastic Processing Equipment:
    Barrel Liners, Screw Tips, Wear Inserts
Dies and Punches for:
    Forming, Cold Extrusion, Drawing, Piercing
Industrial Knives Granulator Blades
Slitter Knives Woodworking Tools
Ceramic Dies Wear Parts

Annealed Hardness: BHN 255/277.

Machinability in the annealed condition is slightly more difficult than 10V. SG type alumina wheels or CBN wheels are recommended for the best grinding performance with the CPM steels.

Thermal Treatments

Critical Temperature: 1540F(838C).

Forging: 2000-2100F(1095-1150C) Do not forge below 1700F(930C). Slow cool.

Annealing: 1600F(870C), hold 2 hours, slow cool 30F(15C)/hr max. to 1000F(540C), then air or furnace cool. Hardness BHN 255/277.

Stress Relieving (After machining): 1100-1300F (595-740C), hold 2 hrs. and air or furnace cool.

Hardening: (Salt, vacuum or atmosphere)

Preheat: 1500-1550F(820-845C), equalize. Second preheat stage at 1850-1900F(1010-1040C) suggested for vacuum or atmosphere hardening.

High Heat: 1950-2150F(1065-1175C). Standard recommendation to achieve 60-62 HRC after tempering for a good combination of wear and toughness is to use 2050F(1120C).

Quench: Salt, oil or atmosphere quench to 1000-1100F(540-595C), equalize, then air cool to below 125F(50C) or hand warm. Vacuum or atmosphere quench rate through 1850-1300F(1010-705C) range is critical to achieve optimum heat treat results.

Straightening: Best done warm 600-1000F(315-540C).

Temper: 1000F(540C) minimum recommended. Double tempering is required.

Stress Relieving (Hardened Parts): Temper 30F(15C) below original tempering temperature.
Hardening Data

Tempering
HEAT TREAT RESPONSE
Temperature
2050F
2100F
2150F
°F
°C
(1120C)
(1150C)
(1175C)

As Quenced
65
64.5
63
1000
540
62
63
64
OPTIMUM FOR MAXIMUM TOUGHNESS AND EFFECTIVE STRESS-RELIEVING.
1025
550
60
62
63
1050
565
58
60
61
1100
595
54
55
56
1150
620
48
50
51
1200
650
46
47
48

Size Change During Hardening

Hardening
Temp.
Tempering
Temp.
HRC
Longitudinal
Size Change
%

°F
°C
°F
°C

1950
1065
1000
540
60
+.04
2150
1175
1000
540
64
+.05

Surface Treatments
CPM 15V can be nitrided or titanium-nitride coated if desired. If the CVD TiN treatment is used, care is required in vacuum hardening.

Physical Properties
Modulus of Elasticity ...................................................................32 psi x 106 (221 GPa)
Specific gravity ............................................................................................................7.41
Density .......................................................................................0.268 lb/in3 (7418 kg/m3)
Coefficient of Thermal Expansion
Temperature
Range
Coefficient of Thermal
Expansion
°F
°C
in/in/°Fx10-6
mm/mm/°Cx10-6
70- 200
21-93
5.96
10.7
70-500
21-260
6.18
11.1
70- 800
21-427
6.54
11.8
70-1100
21-593
6.82
12.3
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