Pm66/Cpm Rex66 Material HSS Black Surface Forging Steel Hot Rolled Steel Flat Bar Round Bar

• Type: Special Steel Bar
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Composition: Stainless Steel Scrap
• Technique: Forged
• Shape: Bar
• Surface Treatment: Polished
• Model NO.: powder high speed steel
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
• Application: Die Steel Bar
• Length: 2500-5500mm
• Material: HSS
• Usage: Gear Hob
• Customized Support: OEM
• Transport Package: N/M
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7226911000
• Production Capacity: 1000ton/Month

Product Description

Detailed Photos

Product Description

 

CPM Rex 66 is a super high speed steel. It is a tungsten type high speed with a high vanadium content for excellent abrasion resistance, similar to that of CPM Rex T15, and 8% cobalt for a higher red hardness than CPM Rex T15. It also offers high compressive strength due to its high attainable hardness. It is best suited for applications requiring both a high red hardness and high wear resistance.

The CPM process results in a homogeneous microstructure with a finer, more uniform carbide distribution imparting superior dimensional stability, grindability and toughness when compared to steels produced by conventional processes. The CPM process also allows the design of more highly alloyed grades which cannot be produced by conventional steelmaking.

Typical Applications:
Spade Drills
Form Tools
End Mills Reamers
Broaches
Hobs
Shaper Cutters
Milling Cutters
Tool Bits

Chemical Composition:

CPM Rex66	Carbon	Chromium	Vanadium	Tungsten	Molybdenum	Cobalt	Sulfur
	1.67%	4.75%	4.80%	9.50%	2.00%	8.0%	0.06% (0.22%)*

            
Physical Properties:
Elastic Modulus      31X106psi       214 GPa
Specific Gravity      8.25
Density             0.298 lbs/in3     8.249 g/cm3


Coefficient of Thermal Expansion

 °F            °C            in/in/°F            mm/mm/°C
70-500        20-260        5.5 X 10-6         9.9 X 10-6
70-800        20-425        6.1 X10-6         11.0 X 10-6
70-1000       20-540        6.4 X10-6         12.5 X 10-6

Machinability and Grindability:
The machinability and grindability of CPM Rex 66 compares favorably to CPMT15 and other high speed steels because of the very fine, uniformly distributed carbides. The high sulfur (HS) modification provides enhanced machinability without detrimentally affecting the tool's toughness.

Surface Treatments:
CPM Rex 66 can be nitrided or PVD coated if desired. If a CVD treatment is used, subsequent hardening is required and may result in undesirable distortion.

Thermal Treatments:
Annealing
Heat to 1600°F (870°C), hold 2 hours, slow cool no faster than 25°F (15°C) per hour to 1000° F (540°C), then furnace cool or cool in still air to room temperature.

Annealed Hardness: Approx. BHN 245/275

Stress Relieving Annealed parts: 
Heat to 1300°F (705°C), hold 2 hours, then air cool or furnace cool.
Hardened parts: 
Heat to 25°F (15°C) below original tem pering temperature, or 1000°F (540°C) minimum, hold 2 hours, then air cool or furnace cool. Straightening: Best done warm 400-800°F (200-430°C)

Hardening (Salt Bath or Vacuum Furnace preferred.)
Pre-heat: 1500-1550°F (815-845°C), hold long enough to soak through. Asecond pre-heat at 1850-1900°F (1010 1040°C) is recommended when vacuum hardening.

Austenitize: 
2050-2200°F (1120-1205°C). Hold part at temperature 5-10 minutes. Soak time will vary depending on part size. Smaller part size, use the shorter soak time, whereas larger parts should be soaked longer.

Quench:
Salt, oil or atmosphere quench to below 1100°F (595° C), equalize then air cool to hand warm, below 125°F (50°C). Vacuum or atmosphere quenching may result in slightly lower hardness for larger tools. The quench rate through 1850-1300° F (1010-705°C) is critical to achieve optimum results. Aslower cooling rate below 1000°F (540°C) may be used to minimize distortion.

Temper:
Triple temper at 1000°F (540°C) or higher. Hold at least 2 hours at temperature for each temper. Air cool to room temperature between tempers. Typical tempering range is 1025-1050°F (550-565°C).