Standard Alloys

Aurora Metals produces a wide range of nonferrous and ferrous casting alloys. Copper based (brass, bronze and copper) alloys make up the majority of our production and are cast using the vacuum die casting and permanent mold casting applications. At this time ferrous alloys (cast iron and stainless steel) are only produced in our no-bake sand foundry.

The proper choice of a copper based alloy is critical to the design and performance of the part. To assist you in that choice, the tables below provide specifications for the primary copper based alloys cast at Aurora Metals. If you are in need of an alloy that is not on the list, please contact our sales department for further information at 630-844-4900.

Choose the alloy of interest to view its table of properties.
For all alloys, you must also refer to the notes which appear after the last table.

Alloy # C81100 - High Conductivity Copper

Alloy #
      C81100

Alloy Name

 High Conductivity Copper

Composition (Nominal)

 99.7% Cu (including Ag)
 .30% Total Other Elements

Mechanical Properties (as sand cast)

Tensile Strength (Typical)

 25 ksi  /  172 MPa

Yield Strength (Typical)
(0.5% Ext. under load)

  9 ksi   /   62 MPa

Elongation (Typical)

  40 %, in 2 in.   /   40 %, in 51 mm

Brinell Hardness (500 kg load)

  44      /   44

Fatigue Strength (at 108 cycles)

  9 ksi   /  62 MPa

Physical Properties

Density

 .323 lb/in.3 at 68 F    /    8.94 g/cm3 at 20 C

Electrical Resistivity

 11.3 ohm x cmil/ft at 68F  /  1.9 micorohm-cm at 20C

Thermal Conductivity

 200.0   Btu x ft/(hr x ft2 x deg. F) at 68F
 346.1   W/m x deg.K at 20C

Electrical Conductivity

 92  %IACS at 68F    /    0.538 Siemens/cm at 20C

Machinability

  10   (Free Cutting Brass [C36000] = 100)

Comments

High conductivity, good thermal conductivity, poor machinability

Alloy # C86500 - High Strength Yellow Brass

Alloy #
      C86500

Alloy Name

 High Strength Yellow Brass

Composition (Nominal)

 58.0% Cu
     .5% Sn
     .0% Pb
 39.0% Zn
   1.2% Fe
   1.0% Al
     .80% Mn

Mechanical Properties (as sand cast)

Tensile Strength (Typical)

 71 ksi  /  490 MPa

Yield Strength (Typical)
(0.5% Ext. under load)

 29 ksi  /   200 MPa

Elongation (Typical)

  30 %, in 2 in.   /   30 %, in 51 mm

Brinell Hardness (500 kg load)

Brinell Hardness (3000 kg load)
   100    /  100
  130    /  130

Fatigue Strength (at 108 cycles)

  20 ksi   /  138 MPa

Physical Properties

Density

 .301 lb/in.3 at 68 F    /    8.33 g/cm3 at 20 C

Electrical Resistivity

 47.0 ohm x cmil/ft at 68F  /  7.8 micorohm-cm at 20C

Thermal Conductivity

 49.6   Btu x ft/(hr x ft2 x deg. F) at 68F
  85.8   W/m x deg.K at 20C

Electrical Conductivity

 22  %IACS at 68F    /    0.128 Siemens/cm at 20C

Machinability

  26   (Free Cutting Brass [C36000] = 100)

Alloy # C87500 - Silicon Bronze & Silicon Brass

Alloy #
      C87500

Alloy Name

 Silicon Bronze & Silicon Brass

Composition (Nominal)

 82.0% Cu
 14.0% Zn
   4.0% Si

Mechanical Properties (as permanent mold cast)

Tensile Strength (Typical)

 82 ksi  /  566 MPa

Yield Strength (Typical)
(0.5% Ext. under load)

 36 ksi  /   249 MPa

Elongation (Typical)

  15 %, in 2 in.   /   15 %, in 51 mm

Rockwell Hardness (B scale)

 83   /   83

Fatigue Strength (at 108 cycles)

(as sand cast)
   22 ksi   /  152 MPa

Physical Properties

Density

 .299 lb/in.3 at 68 F    /    8.28 g/cm3 at 20 C

Electrical Resistivity

 154.2 ohm x cmil/ft at 68F  /  25.6 micorohm-cm at 20C

Thermal Conductivity

 16.0   Btu x ft/(hr x ft2 x deg. F) at 68F
  27.7   W/m x deg.K at 20C

Electrical Conductivity

 7  %IACS at 68F    /    0.039 Siemens/cm at 20C

Machinability

  50   (Free Cutting Brass [C36000] = 100)

Alloy # C87600 - Silicon Bronze & Silicon Brass

Alloy #
      C87600

Alloy Name

 Silicon Bronze & Silicon Brass

Composition (Nominal)

 89.0% Cu
  5.5% Zn
   4.5% Si

Mechanical Properties (as sand cast)

Tensile Strength (Typical)

 66 ksi  /  455 MPa

Yield Strength (Typical)
(0.5% Ext. under load)

 32 ksi  /   221 MPa

Elongation (Typical)

  20 %, in 2 in.   /   20 %, in 51 mm

Brinell Hardness (500 kg load)

Brinell Hardness (3000 kg load)
   110    /  110
  135    /  135

Physical Properties

Density

 .300 lb/in.3 at 68 F    /    8.30 g/cm3 at 20 C

Electrical Resistivity

 132.2 ohm x cmil/ft at 68F  /  23.0 micorohm-cm at 20C

Thermal Conductivity

 16.4   Btu x ft/(hr x ft2 x deg. F) at 68F
  28.4   W/m x deg.K at 20C

Electrical Conductivity

 6  %IACS at 68F    /    0.035 Siemens/cm at 20C

Machinability

  40   (Free Cutting Brass [C36000] = 100)

Alloy # C95300 - Aluminum Bronze

Alloy #
      C95300

Alloy Name

 Aluminum Bronze

Composition (Nominal)

 89.0% Cu
   1.0% Fe
 10.0% Al

Mechanical Properties (as permanent mold cast)

Tensile Strength (Typical)

 82 ksi  /  565 MPa

Yield Strength (Typical)
(0.5% Ext. under load)

 34 ksi  /   235 MPa

Elongation (Typical)

  20 %, in 2 in.   /   20 %, in 51 mm

Rockwell Hardness (B scale)

 80   /  80

Fatigue Strength (at 108 cycles)

(as sand cast)
   22 ksi   /  152 MPa

Physical Properties

Density

 .272 lb/in.3 at 68 F    /    7.53 g/cm3 at 20 C

Electrical Resistivity

 80.2 ohm x cmil/ft at 68F  /  13.3 micorohm-cm at 20C

Thermal Conductivity

  36.3   Btu x ft/(hr x ft2 x deg. F) at 68F
  62.8   W/m x deg.K at 20C

Electrical Conductivity

 13  %IACS at 68F    /    0.075 Siemens/cm at 20C

Machinability

  55   (Free Cutting Brass [C36000] = 100)

Comments

Used in some electrical applications, can be heat-treated.

Alloy # C95400 - Aluminum Bronze

Alloy #
      C95400

Alloy Name

 Aluminum Bronze

Composition (Nominal)

 83.2% Cu
   4.0% Fe
 10.8% Al

Mechanical Properties (as permanent mold cast)

Tensile Strength (Typical)

 105 ksi  /  725 MPa

Yield Strength (Typical)
(0.5% Ext. under load)

  46 ksi  /   320 MPa

Elongation (Typical)

  11 %, in 2 in.   /   11 %, in 51 mm

Rockwell Hardness (B scale)

 88   /  88

Fatigue Strength (at 108 cycles)

(as sand cast)
   28 ksi   /  193 MPa

Physical Properties

Density

 .269 lb/in.3 at 68 F    /    7.45 g/cm3 at 20 C

Electrical Resistivity

 80.2 ohm x cmil/ft at 68F  /  13.3 micorohm-cm at 20C

Thermal Conductivity

  33.9   Btu x ft/(hr x ft2 x deg. F) at 68F
  58.7   W/m x deg.K at 20C

Electrical Conductivity

 13  %IACS at 68F    /    0.075 Siemens/cm at 20C

Machinability

  60   (Free Cutting Brass [C36000] = 100)

Comments

Good wear resistance, can be heat-treated.

Alloy # C95500 - Aluminum Bronze

Alloy #
      C95500

Alloy Name

 Aluminum Bronze

Composition (Nominal)

 80.0% Cu
   4.0% Fe
   4.3% Ni
 11.0% Al

Mechanical Properties (as permanent mold cast)

Tensile Strength (Typical)

 113 ksi  /  780 MPa

Yield Strength (Typical)
(0.5% Ext. under load)

  62 ksi  /   430 MPa

Elongation (Typical)

  6 %, in 2 in.   /   6 %, in 51 mm

Rockwell Hardness (B scale)

 99   /  99

Fatigue Strength (at 108 cycles)

(as sand cast)
   31 ksi   /  214 MPa

Physical Properties

Density

 .272 lb/in.3 at 68 F    /    7.53 g/cm3 at 20 C

Electrical Resistivity

 122.8 ohm x cmil/ft at 68F  /  20.4 micorohm-cm at 20C

Thermal Conductivity

  24.2   Btu x ft/(hr x ft2 x deg. F) at 68F
  41.9   W/m x deg.K at 20C

Electrical Conductivity

 8  %IACS at 68F    /    0.049 Siemens/cm at 20C

Machinability

  50   (Free Cutting Brass [C36000] = 100)

Comments

High strength, can be heat-treated.

Alloy # C95800 - Aluminum Bronze

Alloy #
      C95800

Alloy Name

 Aluminum Bronze

Composition (Nominal)

 81.0% Cu
   4.0% Fe
   4.5% Ni (incl Co)
   9.0% Al
   1.0% Mn

Mechanical Properties (as permanent mold cast)

Tensile Strength (Typical)

 96 ksi  /  660 MPa

Yield Strength (Typical)
(0.5% Ext. under load)

 52 ksi  /   360 MPa

Elongation (Typical)

  17 %, in 2 in.   /   17 %, in 51 mm

Rockwell Hardness (B scale)

 88   /  88

Fatigue Strength (at 108 cycles)

(as sand cast)
   31 ksi   /  214 MPa

Physical Properties

Density

 .276 lb/in.3 at 68 F    /    7.64 g/cm3 at 20 C

Electrical Resistivity

 146.7 ohm x cmil/ft at 68F  /  24.4 micorohm-cm at 20C

Thermal Conductivity

  20.8   Btu x ft/(hr x ft2 x deg. F) at 68F
  36.0   W/m x deg.K at 20C

Electrical Conductivity

 7  %IACS at 68F    /    0.041 Siemens/cm at 20C

Machinability

  20   (Free Cutting Brass [C36000] = 100)

Comments

Resistant to salt water corrosion.

Note that the information in these tables comes from the Standards Handbook for Cast Copper and Copper Alloy Products (Fourth Edition – 1996) published by the Copper Development Association. Please refer to the original publication for more complete information. Neither Aurora Metals nor the Copper Development Association assume any responsibility or liability of any kind in connection with this information and makes no representations or warranties of any kind with respect to any of the products or information listed in these tables. For more information about copper alloys, contact the Copper Development Association, Inc., 260 Madison Avenue, New York, N.Y., 10016.