Find Your Steel

Search our vast selection of steels from us and our sister companies


ExEll P20M-High Hard

Download ExEll P20M-High Hard Spec sheet

P20M High Hard is a higher hardness version (BHN 311-352) of this alloy. The higher hardness level offers greater mold tool wear resistance to abrasive plastic compounds as well as better surface polishing capability.

CHEMISTRY

Typical C Mn Si Cr Mo
Analysis % .34 .80 .40 1.75 .40

DESCRIPTION


  • P-20 High Hard is a pre-hardened mold steel that has been specially designed for large plastic molds.
  • Material is forged on a 5000 ton press assuring maximum deformation during the forging process.
  • Supplied hardness of 321—352 HB (34-38 HRC).
  • Hardness loss in large cross sections is minimal.


CHARACTERISTICS


  • Improved polishability compared to P-20 modified
  • Excellent compressive strength
  • Minimal hardness loss in large cross sections

APPLICATIONS


  • Injection molds
  • Compression molds
  • Mold frames
  • Forming tools
  • Die holders


PHYSICAL PROPERTIES


Density: 0.284 lbs/in3 (room temperature)

Coefficient of Thermal Expansion P20-High-Hard_08 P20-High-Hard_03 P20-High-Hard_05
Thermal Conductivity P20-High-Hard_13 P20-High-Hard_15 P20-High-Hard_17

MECHANICAL PROPERTIES


Room Temperature, hardened and tempered to 321 BHN (34 HRC)

Yield Strength Tensile Strength Elongation Reduction Area
130 KSI 150 KSI 15% 35%

POLISHING


P-20 High Hard can yield an A-2 surface finish when proper polishing procedures are followed. Caution must be taken to avoid over polishing which lead to orange peel effect and pitting.

HEAT TREATMENT


Stress Relieving

Temperature Cooling Note
850°F-900°F
Hold 1 hour/inch
Air Cool Large cross sections require accurate control of temperatures and times.

Tempering

  • Heat uniformly and thoroughly at the selected temperature and hold at temperature for one hour per inch of total thickness.

Temperature °F 700 800 900 1000 1050 1100 1150
Hardness HRC 51 50 47 43 40 35 33
  • Tempering harness is approximate and based on two hours at temperature


WELDING


  • Preheat insert to 600°F to 700°F. Maintain temperature above 600°F during welding.
  • Use TIG with D.C. positive polarity.
  • Depending on the application, various welding rods can be used. P-20 filler which will match the hardness of the base metal after welding and tempering is commonly used. Please contact our heat treatment facility for recommendations.
  • Slowly cool sown to 100°F—150°F, preferably under an insulating blanket, before post heat.
  • Post heat at 1000°F one hour per inch of weld depth plus one additional hour—double temper if possible. Exceeding 1050°F could result in the loss of hardness.

Electrode Dia. (mm) Filler Rod Dia. (mm) Welding AMPS Argon Flow Lt/min Nozzle Dia. (mm)
1.0 1.0 15-80 4-8 8
1.6 1.6 70-150 6-9 8-10
2.4 2.4 100-250 7-10 8-10
3.2 3.2 250-400 10-15 8-10

GENERAL NOTE


All statements regarding the properties or utilization of the materials or products mentioned are for the purposes of description only. Guarantees regarding the existence of certain properties or a certain utilization are only valid if agreed upon in writing.

Request a Quote

  • This field is for validation purposes and should be left unchanged.