The CPM 9V Stainless Steel Flat Bar is a marvel of modern metallurgy, produced through the cutting-edge Crucible Particle Metallurgy (CPM) process. This innovative material is a refined version of CPM 10V, featuring reduced carbon and vanadium content to significantly enhance its toughness and resistance to heat checking. These improvements allow CPM 9V to excel in demanding applications where traditional high carbon, high chromium tool steels like CPM 10V or high-speed steels fall short in toughness and heat check resistance. Additionally, it outperforms lower alloy and hot work tool steels in terms of wear resistance. The CPM process ensures a remarkably uniform, high-quality steel that boasts exceptional dimensional stability, grindability, and toughness, far surpassing the capabilities of 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 Modulus 32 X 106 psi
(221 GPa)
Density .269 lbs./in3
(7.455 g/cm3)
Thermal Conductivity
BTU/hr-ft-°F W/m-°K cal/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 °C in/in/°F mm/mm/°C
70 - 200
(20 - 90)
6.15X10-6
(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°C) Do not forge below 1700°F (930°C). Slow Cool. Annealing: Heat to 1650°F (900°C), hold for 2 hours, and 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 for 2 hours, then furnace cool or cool in still air.
Hardened Parts:
Heat to 25-30°F (15°C) below the original tempering temperature, hold for 2 hours, then furnace cool or cool in still air. Straightening: Best done warm at 400-800°F (200-430°C)
Hardening Preheat:
Heat to 1550-1600°F (845-870°C) and equalize. A second pre-heat stage at 1850-1900°F (1010-1040°C) is suggested for vacuum or atmosphere hardening.
Austenitize:
1850-2150°F (1025-1175°C), with a hold time at temperature of 30-45 minutes.
Quench:
Air or positive pressure quench (minimum 2 bar) 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 toughness for a given hardening treatment. The quench rate through 1850-1300°F (1010-705°C) range is critical to achieve optimum heat treatment response with vacuum or atmosphere quenching.
Temper:
Double temper at a minimum of 1000°F (540°C). For each temper, hold for at least 2 hours.
Size Change: +0.01%
Recommended Heat Treatment:
For the best blend of toughness and wear resistance, austenitize 9V at 2050°F (1120°C), hold for 30-45 minutes, and quench. Temper three times at 1025°F (550°C).
Aim hardness: 54-56 HRC.
Higher austenitizing temperatures can achieve greater hardness, though with a slight reduction in impact resistance. Lower austenitizing temperatures yield the best impact toughness.
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