Cast 4597-C72900
Hardiall® (C72900) is produced by Lebronze Alloys. Hardiall is an extruded and drawn, spinodal hardened copper nickel-tin (CuNiSn) bronze alloy designed for high-strength applications where toughness is required. It resists mechanical wear, galling, stress relaxation, corrosion and erosion. It is non-magnetic and easy to machine into complex components. In addition, it is environmentally friendly, being lead and beryllium free, thus making it a beryllium copper substitute alloy.
Hardiall is used in aircrafts in various components thanks to its outstanding physical and mechanical properties, matching the stringent needs of the aircraft and aerospace industries. Because of these same characteristics, C729 is in high demand for the oil and gas industry, and others as well. C729 is also available, standard stocked, in AMS 4596 and AMS 4598 specifications.
Information
Product description: Copper Nickel-Tin bronze
TEMPERS: TX TS Solution Annealed, Cold Finished and Spinodal Hardened
Solids: 0.75" to 3.54" (19.05 mm to 89.92 mm) O.D.*
*Consult mill for other shapes/sizes
Typical uses
AEROSPACE: brakes, compression fit airframe fasteners, control surface and actuator bushings and bearings, door hardware, electronic system connectors, helicopter controls, hydraulic actuators, landing gear bushings and bearings, steering joints, valves, wheel bearings, wing flap bearings
ELECTRICAL: connectors, contacts, controls, miniaturized sockets, relay elements, switches
Industrial: springs, wire
MARINE: marine components
OIL AND GAS: bearings, bushings, drilling components, sucker rod, valve guide bushing couplings
Chemical composition
| Ni + Co% | Sn% | Fe% | Zn% | Mn% | Cb% | Mg% | Pb% | Cu% |
|---|---|---|---|---|---|---|---|---|
| 14.50-15.50 | 7.50-8.50 | 0.50 | 0.50 | 0.30 | 0.10 | 0.15 | 0.02 | Rem. |
Chemical composition according to AMS 4597
Note: Copper + sum of named elements, 99.5% min. Single values represent maximums.
Machinability
| Copper alloy UNS no. | Machinability rating | Density (lb / in³) | Density (gm / cm³) |
|---|---|---|---|
| AMS 4597-C72900 | 0.323 | 8.94 |
Mechanical properties
Mechanical properties according to AMS 4597.
TX TS Solution Annealed, Cold Finished, and Spinodal Hardened
Size Range: Up to 1.60" (40mm) Enclusive Nominal Thickness Between Parallel Sides (Bars, Rods); Nominal wall thickness (Tubing)
| Ultimate Tensile strength, min | Yield Strength, at 0.2% Offset, min | Elongation, in 4D, min | Rockwell "C" Hardness | Remarks | ||
|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | % | min HRC | |
| 165 | 1137 | 155 | 1069 | 6 | 34 | |
Size Range: 1.60" to 3.25" (40 to 83mm) Inclusive Nominal Thickness Between Parallel Sides (Bars, Rods); Nominal Wall Thickness (Tubing)
| Ultimate Tensile strength, min | Yield Strength, at 0.2% Offset, min | Elongation, in 4D, min | Rockwell "C" Hardness | Remarks | ||
|---|---|---|---|---|---|---|
| ksi | MPa | ksi | MPa | % | min HRC | |
| 156 | 1075 | 148 | 1020 | 3 | 34 | |
Physical properties
| US Customary | Metric | |
|---|---|---|
| Melting point - liquidus | 2039 °F | 1115 °C |
| Melting point - solidus | 1742 °F | 950 °C |
| Density | 0.323 lb/in³ at 68 °F | 8.94 gm/cm³ at 20 °C |
| Specific gravity | 8.94 | 8.94 |
| Electrical conductivity | 7.8% IACS at 68 °F | 0.045 MegaSiemens/cm at 20 °C |
| Thermal conductivity | 17 Btu/sq ft/ft hr/°F at 68 °F | 29.4 W/m at 20 °C |
| Coefficient of thermal expansion 68-572 | 9.1 · 10-6 per °F (68-572 °F) | 15.8 · 10-6 per °C (20-300 °C) |
| Specific heat capacity | 0.09 Btu/lb/°F at 68 °F | 377.1 J/kg at 20 °C |
| Modulus of elastic in tension | 18500 ksi | 127554 MPa |
| Modulus of Rigidity | 7500 ksi | 51711 MPa |
Fabrication properties
| Technique | Suitability |
|---|---|
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene welding | Good |
| Gas shielded arc welding | Excellent |
| Coated metal arc welding | Excellent |
| Spot Weld | Excellent |
| Seam Weld | Excellent |
| Butt Weld | Excellent |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Formed | Good |
Thermal properties
| Treatment | Minimum * | Maximum * |
|---|---|---|
| Annealing | 1515 | |
| Hot Treatment | 1200 | 1600 |