Standard Alloys
Standard Alloys
Aurora Metals produces a wide range of non-leaded nonferrous and ferrous casting alloys. Copper based (brass, bronze and copper) alloys make up most of our production and are cast using vacuum die casting and permanent mold casting applications. Currently 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 # 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 saltwater 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.