MoldMAX XL? Alloy
Materion Brush Performance Alloys’ MoldMAX XL Alloy is a high strength copper mold alloy with good thermal conductivity.The alloy contains no beryllium and is available in sections as large as 12” thick. The alloy’s hardness is comparable with AISI P-20tool steel, but its thermal conductivity is two to three times higher. MoldMAX XL Alloy is used as injection mold cores andcavities. The alloy provides excellent toughness, wear resistance and surface finish. MoldMAX XL Alloy typically machines fasterthan tool steels, and with appropriate machine tools, metal removal rates several times higher can be obtained
CHEMICAL COMPOSITION (weight percent)
AlloyNickelTinCopperMoldMAX XL Alloy8.5-9.55.5-6.5BalancePHYSICAL PROPERTIES
ModulusMelting
Point
(SolidusDensityThermal
ExpansionThermal
Conductivity
(100 °C)Heat
Capacity
(100 °C)17,000 ksi
120 GPa~1695 °F
~925 °C0.322 lb/in3
8.90 g/cm39.0x10-6 in/in °F
16.2 x 10-6 °C -140 BTU/hr·ft·°F
70 W/m·°C0.093 BTU/lb·°F
0.39 J/g·°C
TYPICAL MECHANICAL PROPERTIES*
Yield Strength
(nominal) Ultimate
Tensile
StrengthFatigue
Strength
107 Cycles
(R=-1)Elongation Impact
Strength Hardness105 ksi
720 MPa 115 ksi
790 MPa 35 ksi
240 MPa 6%15 ft·lb
20 J 30 HRC
*Properties may vary by shape and thickness.