P-20 HI PRARD is mold quality alloy steel supplied in the prehardened condition. Special melting and refining practices are utilized to produce a uniform product with exceptional cleanliness. These characteristics allow P-20 HI PRARD to be polished to an extremely high finish required for plastic molding. The material is tested to rigorous tool steel standards to ensure uniformity of structure and freedom from defects. P-20 HI PRARD is supplied prehardened to 352/461 BHN. The balanced alloy composition of P-20 HI PRARD ensures a uniform cross-sectional hardnes.
P-20 HI PRARD is mold quality alloy steel supplied in the prehardened condition. Special melting and refining practices are utilized to produce a uniform product with exceptional cleanliness. These characteristics allow P-20 HI PRARD to be polished to an extremely high finish required for plastic molding. The material is tested to rigorous tool steel standards to ensure uniformity of structure and freedom from defects. P-20 HI PRARD is supplied prehardened to 352/461 BHN. The balanced alloy composition of P-20 HI PRARD ensures a uniform cross-sectional hardnes.
| C | CO | CR | MN | MO | NI | P | S | SI | V | W |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.28 – 0.40 | 1.40 – 2.00 | 0.60 – 1.00 | 0.30 – 0.55 | 0.03 Max. | 0.03 Max. | 0.20 – 0.80 |
Flats • Hollowbar • Metric • Non-Standard • Rounds • Squares • Standard
AISI P20 Alloy Steel-US
AISI P20 Mold Steel-US
DIN 1.2330-Germany
ASTM A681-US
UNS T51620-US
| Treatment | Temperature Range | Cooling/Quenching | Notes |
|---|---|---|---|
| Stress Relieving | 800-900° F | Air cool or furnace cool to room temperature | Heat slowly and uniformly. |
| Annealing | 1500-1600° F | Cool slowly 50° F per hour max to 1200° F and air cool. | It is recommended that P-20 HI PRARD be annealed prior to rehardening. Heat slowly to 1500-1600° F for four hours. |
| Hardening | 1550-1600° F | Oil quench to 150° F or hand warm and temper immediately. | P-20 HI PRARD is normally used in the pre-hardened condition, but may be heat-treated to higher hardness levels for higher strength or for lens mold applications. Preheat and then heat to 1550-1600° F and soak one half hour when material is up to temperature. |
| Preheating | 1250° F | Preheat to 1250° F and hold one hour. | |
| Tempering | (See Chart) | Temper one hour per inch of section thickness to desired hardness. |