| Customization: | Available |
|---|---|
| Type: | Special Steel Bar |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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| PM86/Rex 86 is a super high speed steel (HSS) process that exhibits an excellent combination of high attainable hardness capability (68-70 HRC), red hardness, and abrasive wear resistance for difficult machining applications. The composition is designed to provide an optimum balance of vanadium-rich MC and tungsten-molybdenum-rich M6C primary carbides in the heat treated microstructure for enhanced wear resistance, while still maintaining good fabricating and toughness characteristics compared to other super HSS with similar attainable hardness capability . PM86/Rex 86 may also be considered for cold work tooling or precision wear parts requiring a combination of excellent wear resistance and high attainable hardness. Typical Applications: End Mills Form Tools Broaches Gear Hobs Shaper Cutters Spade Drills Tool Bits Milling Cutters Rolls Punches Special Taps Dies Note: These are some typical applications. Your specific application should not be undertaken without independent study and evaluation for suitability. Chamical Composition:
*Sulfur is added to larger diameter rounds (e.g. ≥ 2-9/16" diameter) to improve the machinability in the annealed condition. Physical Properties: Similar to CPM Rex 76. Density ~ 0.292 lb /cu in (~ 8.1 g/cc) Annealed hardness - 285 / 311 BHN Machinability and Grindability: Machinability (annealed)- comparable to CPM T15. Grindability (heat treated) - comparable to CPM T15 and CPM Rex 76, and significantly better than conventional T15 or other PM HSS with greater vanadium-rich MC carbide content. Thermal Treatments: 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. Stress Relieving: Annealed parts: Heat to 1100-1300°F (595-705°C), hold 2 hours, furnace or still air cool to room temperature. Hardened parts: Heat to 25°F (15°C) below original tempering temperature or 1000°F (540°C) minimum, hold 2 hours, furnace or still air cool to room temperature. Hardening: Pre-heat: Heat to 1500-1550°F (815-845°C), equalize. An additional pre-heat at 1850-1900°F (1010-1040°C) may be desirable to minimize time at final austenitizing temperature. Austenitize: heat to 2050-2175° F (1120-1190°C) depending upon desired hardness (see table). Lower hardening temperatures (underhardening) provide finer grain size and increased toughness. Higher hardening temperatures provide maximum hardness, red hardness, and wear resistance. Quench: Interrupted salt quench, oil quench, rapid gas quench, or air cool to below 1100°F (595°C), equalize, then air cool to hand warm (< 125°F or 50°C). Temper: Triple tempering at 1025-1050°F (550-560°C) recommended for optimum tempering and/or stress-relieving (2 hrs each). Cool to room temperature between tempers. Cryogenic cooling between the first and second tempers optional. Straightening: Best done warm at 400°F (205°C) minimum. |
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