AISI P20 plastic mold tool steel Manufacturer and Exporter,supplied with round,square,flat,block,and shaft etc.AISI P20 is a Cr-Mo alloyed steel as per ASTM A681.It is generally supplied in the hardened and tempered condition with hardness 285-340 HBW.Compared with P20+S(1.2312), it has good polishing and texturing properties,good machinability,and uniform hardness.
1.Supply Form & Size & Tolerance
|Φ6-Φ100||Cold Drawn||Bright/Black||Best H11|
Remark:Tolerance can be customized as per requests
|DIN ISO 4957||1.2311||0.35-0.45||0.2-0.4||1.3-1.6||0.03||0.03||1.8-2.1||0.15-0.25|
|Modulus of elasticity,N/mm2||250000||200000|
|Coefficient of thermal expansion,per °C from 20°C||—||12.7 x 10 ^–6|
|Specific heat,J/kg °C||460||—|
4. Mechanical Property
|Tensile strength Rm,N/mm2||1020||930|
|Yield strength Rp 0.2,N/mm2||900||800|
|Compressive yield strength Rc 0.2,N/mm2||850-1000|
Heat AISI P20 to the temperature 700 oC ,hold for suitable time,then heat the temperature uniformly to 900 oC – 1100 oC.Forging below 870°C is not recommended for P20. Cooling in sand after forged.
After rough machining ,P20 should be heated through to500- 550°C, holding time 2 hours. Cool slowly in the furnace to room temperature.
Heat P20 in a protective atmosphere (preferably a controlled atmosphere furnace) to 720-750°C,and hold for one hour per inch of thickness. Cool in the furnace at 10°Ccper hour to 600°C,Then air-cool to room temperature.The resulting hardness Is Brinell 235 max.
Preheating temperature: 500–600°C
Austenitizing temperature: 880°C.
The steel should be heated through to the austenitizing temperature and hold at temperature for 30 minutes. Protect the tool against decarburization and oxidation during the hardening process.
• High speed gas/circulating atmosphere. (Only suitable for small dimensions)
• Oil (Warm oil (65-80°C))
• Martempering bath 300°C, max. 4 minutes,then air cool
Note: Temper immediately when tool reaches 50–70°C.
Choose the tempering temperature according to the hardness required by reference to the tempering graph. Temper twice with intermediate cooling to room temperature. Lowest tempering temperature 180°Cfor small inserts, but preferred minimum is 250°C, unless material is to be nitride or nitrocarburized later. Holding time at temperature minimum 2 hours.
AISI P20 tool steels are used for low temperature applications that include injection molds and die casting dies. Typical application are:
• For large injection and compression molds
• Extrusion dies for thermoplastics
• Blow molds
• High strength holders, plates and bolsters
• Forming tools, press-brake dies (possibly flame hardened or nitrided)
• Aluminum die casting prototype dies
• Zinc die casting dies
• Long run die shoes
• Structural components, shafts