Pm45/Cpm Rex45 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
• 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 45 is an 8% cobalt modification of M3 high speed steel. It hasred hardness comparable to that of M42 but offers abrasion resistance even better than that of M3. With its excellent red hardness, good wear resistance and good toughness, CPM Rex 45 is suitable for difficult machining applications or high cutting speed applications.
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:
Gear Hobs
Milling Cutters
End Mills
Extrusion Punches
Form Tools
Shaper Cutters
Broaches
Taps
Note: These are some typical applications. Your specific application should not be undertaken without independent study and evaluation for suitability.


Chemical Composition:

CPM Rex45(HS)	Carbon	Chromium	Vanadium	Tungsten	Molybdenum	Cobalt	Sulfur
	1.30%	4.05%	3.05%	6.25%	5.00%	8.00%	0.06 (0.22%)*

             
*Sulfur is added to improve the machinability of larger diameter rounds (e.g. 2-9/16" and over). The higher sulfur content benefits the toolmaker by increasing the ease of manufacture, and benefitsthe tool user by increasing the ease of resharpening. The CPM process permits the use of sulfurwithout affecting the tool's performance.

Physical Properties:
Elastic Modulus    31 X106psi       214 GPa
Specific Gravity    8.05
Density           0.291 lbs/in3      8.05 g/cm3
Coefficient of Thermal Expansion
 °F           °C           in/in/°F          mm/mm/°C
70-750       20-400       6.3 X 10-6       11.4 X 10-6
70-1100      20-595       6.4 X 10-6       11.5 X 10-6

Machinability and Grindability:
Machinability of CPMRex 45 in the annealed condition is approximately 30% of W1 Tool Steel (1%C).

Grindability of CPM Rex 45 compares favorably with regular high speed steels because of its fine, uniformly distributed carbides. Conventional grinding wheels designed for high speed steels can be used. In special cases, the advice of a grinding wheel manufacturer should be sought.

Thermal Treatments:
Critical Temperature: 1500°F (815°C) Forging: 2000-2100°F (1095-1150°C). Do not forge below 1700°F (925°C). Slow cool after forging.

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 255/285

Stress Relieving Annealed parts: Heat to 1100-1300°F (595-705°C), hold 2 hours, then furnace cool or cool in still air. Hardened parts: Heat to 25°F (15°C) below original tem pering temperature, or 1000°F (540°C) minimum, hold 2 hours, then furnace cool or cool in still air. Hardening (Salt or High Pressure Vacuum preferred)

Pre-heat: Heat to 1500-1550°F (815-845°C), hold long enough to soak through. For vacuum heat treating, an additional pre-heat at 1850-1900°F (1010-1040°C) is rec ommended to minimize hold time needed at austenitizing temperature.

Austenitize: 2100-2190°F (1150-1200°C) Standard recommendation to achieve HRC 66-68 is 2175°F (1190°C).

Quench:
Quench rapidly to below 1100°F (595°C), equal ize, then air cool to hand warm, below 125°F (50°C). Salt or interrupted oil quenching usually gives the best heat treat response for high speed steels. Afast quench rate from hardening temperature to below 1100°F (595°C) is critical to achieve optimum heat treat response.

Temper: 
1000°F (540°C) minimum. Triple tempering is required, hold 2 hr. minimum at temperature. Cool to room temperature between tempers.

Straightening:
Best done warm 400°F minimum (205°C). Straightening after salt quenching and before cooling to below 400°F (205°C) is preferred.