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C18000 - ThermoMet UNS C18000

Additional Alloys

C18000 - ThermoMet UNS C18000

Materion Brush Performance Alloys’ UNS C18000 (ThermoMet) is a low cost copper nickel silicon chromium alloy with high electrical and thermal conductivity possessing good strength and hardness. Typical applications include resistance welding equipment and injection mold and blow mold cores and cavities.

Advantages/Benefits of c18000

Due to the unique combination of thermal conductivity and strength available in this material, when used in plastic molds you gain advantages like:

  • Shorter cycle time
  • Improved plastic part dimensional control
  • Better parting line maintenance
  • Excellent corrosion resistance

In resistancte welding equipment it provides the electrical and thermal conductivity required to carry high current and the hardness necessary to avoid wear and mushrooming.

C18000 common uses and applications

C18000 (ThermoMet) is commonly used for injection mold cores and cavitiesas well as in resistance welding equipment.

Chemical composition of C18000

  • Nickel – 1.8 to 3.0
  • Silicon – 0.4 to 0.8
  • Chromium - 0.6 to 1.2
  • Copper - balance

 Physical properties of C18000

  • Elastic modulus - 18.5x106 psi (128 GPa)
  • Density - .318 lb/in3 (8.81 g/cm3)
  • Poisson's Ratio - 0.3
  • Electrical Conductivity - 45% IACS (26 MS/m) minimum
  • Thermal Conductivity at 212°F (100°C) - 120 BTU/hr ft °F (208 W/m K)
  • Coefficient of Thermal Expansion - 9.7 ppm/°F (17.5 ppm/°C)
  • Specific Heat (Heat Capacity) at 70°F (20°C) - 0.092 BTU/lb °F (385 J/kg K)
  • Melting Temperature (Solidus) - 1900°F (1040°C)

Nominal Mechanical properties of C18000

  • 0.2% Offset Yield Strength - 75 ksi (520 MPa)
  • Ultimate Tensile Strength - 95 ksi (655 MPa)
  • Tensile Elongation in 2 inches (50.8 mm) - 14%
  • Hardness - 92 HRB

C18000 Available Forms, Sizes and Tolerances

C18000 (ThermoMet) is available in

  • Rod from 0.625 to 14 inches (16 to 355.6 mm) diameter
  • Tube from 1 to 8 inches (25.4 to 203 mm) outside diameter, with wall thickness approximately 10-20% of outside diameter
  • Plate from 0.5 to 8 inches (12.7 to 203.2 mm) thickn
  • Forged rings and finished parts fabricated per customer drawings.

Rod Tolerances

Tube Tolerances

Plate Tolerances

Applicable Specifications and Standards

UNS Number C18000, RWMA Class III.

Contact Materion Brush Performance Alloys

To learn more about our BrushBronze EQX20 alloy, contact Materion Brush Performance Alloys today.

 

Rod Tolerances

Diameter (inches)  Diametral 
Tolerance (inches) 		    Diameter (mm) Diametral 
Tolerance (mm) 
 Over Including     Over  Including
 0.75  1.25  ±0.020    20  30  ±0.50
 1.25  2.50  ±0.030    30  38  ±0.75
 2.50  6.00  ±0.060    38  150  ±1.50

Tube Tolerances

 Outside Diameter (inches)  Diametral
Tolerance (inches)		   Outside Diameter (mm)  Diametral
Tolerance (mm) 
 Over  Including    Over  Including
 0.750  1.25  ±0.020     20  30  ±0.50
 1.25  2.50  ±0.030    30  38  ±0.75
 2.50  6.00  ±0.060    38  150  ±1.50
 6.00    ±0.060    150    ±1.50

Plate Tolerances

 Thickness (inches) Thickness
Tolerance (inches) 		   Thickness (mm)   Thickness
Tolerance (mm)
 Over Including   Plus  Minus    Over Including   Plus  Minus
 0.750  1.00  0.046  0    20.0  30.0  1.20  0
 1.00  1.50  0.056  0    30.0  40.0  1.40  0
 1.50  3.00  0.066  0    40.0  60.0  1.70  0
 3.00    0.125  0    60.0    3.175  0