AISI P20 Steel Plate Material is a versatile, low-alloy tool steel that is characterized by good toughness at moderate strength levels. The special purpose mold steel P20 steel plate is commonly used for plastic injection mold cavities and tooling and for die casting dies for zinc.
» USA: AISI P20
» France: AFNOR Z210CW12-01
» China: 40CrMnNiMo7
» Germany: 1.2311
| C | Cr | SI | Mn | Mo | P | S | |
| Min | 0.35 | 1.80 | 0.20 | 1.30 | 0.15 | -- | -- |
| Typical | 0.40 | 1.95 | 0.30 | 1.45 | 0.20 | -- | -- |
| Max | 0.45 | 2.10 | 0.40 | 1.60 | 0.25 | 0.035 | 0.035 |
APPLICATIONS
- » Die holders
- » Casting Dies
- » Backers
- » Shoe Blocks
- » Mold frames
- » Injection molds
- » Bolsters
FORM SUPPLIED
- » Round Bar
- » Square Bar
- » Plates
- » Sheets
- » Flat Bars
Available surface conditions : hot rolled, ground, peeled, turned, drawn, cold rolled
HEAT TREATMENT
- Stress-releiving: Preheating: Because mold steel P20 steel plate is sold in a pre-hardened condition, hardening heat treatment is not necessary. After machining and intermittently during service, the steel must be thermally stress relieved by heating to 900ºF (482ºC), equalizing and holding for one hour per inch (25.4mm) of thickness, and cooling in air to ambient temperature
- Hardening :Critical Temperature: Ac1: 1405ºF (763ºC)Preheating of P20 metal: Heat at a rate not exceeding 400ºF per hour (222ºC per hour) to 1150-
1250ºF (621-677ºC) and equalize. Austenitizing (High Heat)-Heat rapidly from the preheat to 1550ºF (843°C). Soak for 30 minutes for first inch (25.4mm) of thickness, plus 15 minutes for each additional inch (25.4mm).
- Quenching: Pressurized gas, or interrupted oil to 150-125ºF (66-51ºC).For oil, quench until black, at about 900°F (482°C), then cool in still air to 150-125°F (66-51°C)
- Tempering:P20 tool steels are tempered at 482-593°C (900 to 1100°F) for a Rockwell C hardness of 37 to 28.
- Annealing:for AISI P20 tool steels takes place at 760-788°C (1400 to 1450°F) and then the steels are cooled slowly in the furnace at a temperature less
than 4°C (40°F) per hour
| Tool | Hardening | Tempering |
| single edge cutting tools | 1220 ºC | 560 ºC |
| multi edge cutting tools | 1180-1220 ºC | 560 ºC |
| cold work tools | 1050-1150 ºC | 560 ºC |
PROCESSING
O1 can be worked as follows :
- Machining( grinding,turning,milling)
- Polishing
- Hot forming
- Electrical discharge machining
- Welding(special procedure incl. pre-heating & filler
materials of base material composition)
GRINDING
During Grinding, local heating of the surface, which can alter the temper, must be avoided. Grinding wheel manufacturers can provide advise on the choice of grinding wheels
SURFACE TREATMENT
The Steel Grade is a perfect substrate material for PVD coating. If nitriding is requested, a small diffusion zone is recommended but avoid compound and oxidized layers.
DELIVERY HARDNESS
- » Typical soft annealed hardness is 235 HB
- » Cold drawn and cold rolled material is typically 10-40 HB harder
