1.2311 Plastic Mold Tool Steel P20 Steel Plate

1.2311 Plastic Mold Tool Steel P20 Steel Plate


1. Supply Range of P20 Steel

Round Bar: diameter 200mm – 1000mm

Steel Plate: thickness 16-100mm x width 200-2000mm

Surface Finish: Black, Rough Machined, Turned or as per given requirements.


2. Relevant P20 Tool Steel Specification and Equivalent Steel Grades

StandardASTM A681DIN EN ISO 4957GB/T 1299

3. AISI P20 Steel Plate Materials

GBT 12990.280.40.610.

4. ASTM P20 Mold Tool Steel Properties

Physical Properties

  • Density: 0.284 lb/in3 (7861 kg/m3)
  • Specific Gravity: 7.86
  • Modulus of Elasticity: 30 x 106 psi (207 GPa)
  • Thermal Conductivity:
  • 24 Btu/ft/hr/°F
  • 41.5 W/m/°K
  • Machinability: 60-65% of a 1% carbon steel

P20 Steel Mechanical Properties

Hardness, Brinell (typical)300
Hardness, Rockwell C (typical)30
Tensile strength, ultimate965-1030 MPa
Tensile strength, yield827-862 MPa
Elongation at break (in 50 mm (2″))20.00%
Compressive strength862 MPa
Charpy impact (V-Notch)27.1-33.9 J
Poisson’s ratio0.27-0.30
Elastic modulus190-210 GPa

AISI P20 Mold Tool Steel Thermal Properties

T (°C)Treatment
Thermal expansion12.8 x 10-6/ºC20-425

5. Forging of P20 Steel Plate Mold Steel

AISI P20 steel plate and round bars materials are forged at 1093°C (2000°F) down to 899°C (1650°F). Forging below 871°C (1600°F) is not recommended for these steels P20 material.

6. Heat treatment of Tool Steel P20 material

  • Stress Relieving

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.

In those rare circumstances where the AISI steel P20 must be re-hardened, the steel must first be annealed prior to hardening.

  • 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

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.

7. Applications of P20 Steel Plate or Bar

P20 tool steels are used for low temperature applications that include injection molds and die casting dies. Main applications of P20 steel plate and bar:

Plastic moulds, die holder, backers, rames for plastic pressure dies, hydro forming mold tools. bolsters, die holders. Also suitable for other applications such as rails, shafts and wear strips.

We are reliable P20 tool steel, P20 steel plate, steel round bar and P20 steel flat supplier. Quality guarantee and reliable service make us a better choice for you for P20 special tool steel. We offer better P20 steel price and supplier service. Contact us today.