CPM 9V is manufactured through the innovative Crucible Particle Metallurgy process. This specialized technique results in a composition that is a refined version of CPM 10V, offering reduced carbon and vanadium levels to significantly enhance toughness and heat check resistance. These remarkable properties enable CPM 9V to excel in challenging applications where high carbon, high chromium tool steels, such as CPM 10V or high-speed steels, fail to provide adequate toughness or heat check resistance. Additionally, it surpasses the wear resistance offered by lower alloy tool steels and hot work tool steels. The CPM process ensures ultra-homogeneous, premium-quality steel marked by exceptional dimensional stability, superior grindability, and unmatched toughness when compared to conventionally produced steels.
Typical Applications:
Forming Rolls
Punches
Rolling Mill Rolls
Dies
Header Tooling
Slitter Knives
Extrusion Tooling
Shear Blades
Pelletizer Blades
Granulator Blades
Plasticizing Components: Non-return Valves and Screws
Chemical Composition:
Physical Properties:
Elastic Modulus32 x 10^6 psi
(221 GPa)
Density0.269 lbs./in3
(7.455 g/cm3)
Thermal Conductivity
BTU/hr-ft-°FW/m-°Kcal/cm-s-°C
72°F 22°C
11.83
20.48
4.89 x 10^-2
212°F 100°C
12.48
21.60
5.16 x 10^-2
392°F 200°C
13.35
23.10
5.52 x 10^-2
572°F 300°C
14.59
25.25
6.03 x 10^-2
932°F 500°C
14.91
25.81
6.16 x 10^-2
1004°F 540°C
15.07
26.08
6.23 x 10^-2
Coefficient of Thermal Expansion
°F°Cin/in/°Fm/m/°C
70 - 200
(20 - 90)
6.15 x 10^-6
(11.07X10-6)
70 - 400
(20 - 200)
6.21X10-6
(11.18X10-6)
70 - 800
(20 - 430)
6.45X10-6
(11.61X10-6)
70 -1200
(20 - 650)
6.59X10-6
(11.86X10-6)
Thermal Treatments:
Critical Temperature: 1590°F (865°C) Forging: 2000-2100°F (1095-1150°) Do not forge below 1700°F (930°C). Slow Cool. Annealing: Heat to 1650°F (900°C), hold 2 hours, slow cool no faster than 30°F (15°C) per hour to 1000°F (540°C), then furnace cool or cool in still air to room temperature. Annealed
Hardness: About BHN 223-255
Stress Relieving Annealed Parts: Heat to 1100-1300°F (595-700°C), hold 2 hours, then furnace cool or cool in still air.
Hardened Parts:
Heat to 25-30°F (15°C) below original tempering temperature, hold 2 hours, then furnace cool or cool in still air. Straightening: Best done warm 400-800°F (200-430°C)
Hardening Preheat:
Heat to 1550-1600°F (845-870°C) Equalize. Second pre-heat stage at 1850-1900°F (1010-1040°C) suggested for vacuum or atmosphere hardening.
Austenitize:
1850-2150°F (1025-1175°C), hold time at temper ature 30-45 minutes.
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). Salt bath treatment, if practical, will ensure maximum attainable tough ness for a given hardening treatment. Vacuum or atmosphere quench rate through 1850-1300°F(1010-705°C) range is critical to achieve optimum heat treat response.
Temper:
Double temper at 1000°F (540°C) minimum. 2 hours minimum each time. (See Table)
Size Change: +0.01%
Recommended Heat Treatment:
For the best combination of toughness and wear resistance, austenitize 9V at 2050°F (1120°C), hold 30-45 minutes, and quench. Temper 3 times at 1025°F (550°C).
Aim hardness: 54-56 HRC.
Higher austenitizing temperatures can be used to obtain higher hardness, at a slight decrease in impact resistance. The lower austenitizing temperatures provide the best impact toughness.
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