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Amera-Mold is engineered expressly for the plastics molding industry. Amera-Mold is a pre-hardened alloy steel delivered at Rockwell C 28–32 (special hardness upon request). As a result of its fine grain structure (95% of 8), close chemistry, and quality control, Amera-Mold assures our customers of excellent machinability and high lustrous finish unequaled in the industry

Typical Analysis

  • Carbon .50
  • Manganese 1.00
  • Chromium 1.05
  • Silicon .32
  • Molybdenum .20
  • Nickel .61
  • Vanadium .28

Features And Advantage

  • Usually eliminates the cost of heat treating by the customer
  • Excellent machinability
  • High lustrous (mirror-like) finish
  • Deep hardening
  • Good compressive strength
  • Retains high strength at operating temperatures as high as 900°F

Applications

  • Injection or compression molding of plastics requiring high sheen on the finished product
  • Plastic film extrusion dies
  • Zinc casting dies

Heat Treatment

For most plastic molding operations, no further heat treatment is required. However, if the material is committed to reforging, if higher hardness is required, or if stress relieving is necessary after heavy machining, the following cycles are suggested:

  • Stress relieving Approximately 1000°F
  • Forging Heat to 2100°F, stop at 1800°F and cool slowly
  • Normalizing 1600°F, air cool
  • Annealing 1525°F, cool 20° per hour to 1195°F, air cool, Brinell 207 max.
  • Hardening 1525°F, oil-quench
  • Tempering Temper at 1150°F (depending on size and desired properties)
  • Nitriding 1000°–1025°F for 25 hours produces 0.025” case depth
  • Carburizing 1700°–1750°F for Rockwell C 63–64 surface hardness

General Instructions

Amera-Mold is delivered fully quenched and tempered to a hardness range of Brinell 285 to 321. For most operations, no further heat treatment is required. Where heat treatment is required, refer to the following procedures.

  • Stress relieving Stress produced by cold work operations such as hobbing, straightening, deep stamping, grinding, and heavy machining continue to add distortion during heat treatment and should be removed prior to hardening. Heat to 1000°–1100°F, holding until all parts are heated uniformly, and cooling to room temperature. If the stresses are produced after machining in the heat-treated condition, the maximum stressrelieving temperature is 100°F below the tempering temperature.
  • ForgingHeat Amera-Mold to approximately 2100°F, and hold until the piece is thoroughly heated before forging. Stop forging at 1800°F and reheat if necessary. After forging, the piece should be buried in an inert, heat-insulating material and slow cooled. Then normalize and anneal.
  • Normalizing Heat to approximately 1600°F and hold at temperature 1 hour per inch of greatest thickness. The piece should then be cooled to room temperature in still air.
  • Annealing Heat the piece in a protective atmosphere to 1525°F and soak 1 hour per inch of greatest thickness. Maintain atmosphere control and cool at a rate of 20°F per hour to 1195°F and then air cool. This procedure should produce a hardness of Brinell 212 maximum.
  • Hardening Heat to a temperature of 1525°F and hold for 1 hour per inch of greatest thickness. Quench in oil to 150°F and temper immediately.
  • Tempering Temperature will vary with the size of the piece and the application. Use the chart below to achieve desired tempering properties.
Tempering Temperature (°F) Yield Point (psi) Tensile Strength (psi) Elongation (%) Reduction (%) Hardness (Brinell)
400° 247,500 301,500 10.25 33.95 578
500° 249,500 283,250 10.0 37.25 555
600° 240,500 268,500 10.5 40.65 534
700° 224,250 243,000 10.25 39.6 495
800° 212,000 223.500 9.5 38.8 444
900° 201,000 214,000 11.0 44.0 429
1000° 184,500 198,000 11.5 40.1 401
1050° 170,000 182,000 14.0 48.3 375
1100° 162,000 157,000 14.5 49.5 363
1150° 160,000 174,000 15.0 49.5 363
1200° 147,000 158,000 17.0 56.2 331
1250° 130,000 142,500 18.5 58.6 292
1300° 117,000 128,000 20.0 59.1 262

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