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AMS 4596-C72900 Hardiall®

Stocked alloy specs

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Reference guide

Stocked size schedules

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✔ Standard-stocked product

Extruded and drawn

Wieland Concast is the exclusive North American supplier of Hardiall® (C72900) 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 4597 and AMS 4598 specifications. More»


Wieland Concast is also certified to AS9100 standards and requirements. AS9100 certificate can be viewed here.



*Lebronze alloys

AMS 4596-C72900 spec sheet AMS 4596-C72900 size schedule C72900 brochure Aerospace brochure Aerospace booklet Oil and gas brochure Weight calculator Standard products

AMS 4596-C72900 Hardiall®

Product description: Copper nickel-tin bronze
Tempers: TX 00 solution annealed and spinodal hardened
Solids: 0.75" to 6.75" (19.05 mm to 171.45 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%
Chemical composition according to AMS 4596

Note: Copper + sum of named elements, 99.5% min. Single values represent maximums.
14.50-
15.50		 7.50
8.50		  
0.50		  
0.50		  
0.30		  
0.10		  
0.15		  
0.02		  
Rem.

Machinability

AMS Machinability rating Density (lb/in3) Density (g/cm3)
AMS 4596-C72900   0.323 8.94

Mechanical properties

Mechanical properties according to AMS 4596

TX 00 Solution Annealed and Spinodal Hardened

Size range: up to 4.249" (108 mm) inclusive (nominal thickness between parallel sides) bars, rods
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  
132 910 107 738 9.5 30  
Size range: 4.250" to 8.500" (108 to 216 mm) inclusive (nominal thickness between parallel sides) bars, rods
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  
127 876 108 745 3 30

Physical properties

Physical properties provided by CDA
  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 elasticity in tension 18500 ksi 127554 MPa
Modulus of rigidity 7500 ksi 51711 MPa

Fabrication properties

Fabrication properties provided by CDA
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

Thermal properties provided by CDA
*Temperature is measured in Fahrenheit.
Treatment Minimum* Maximum*
Annealing 1515  
Hot treatment 1200 1600

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C14500 C23000 C24000 C26000 C31400 C31600 C46400 C51000 C52100 C53400 C54400 C62400 C63000 C63020 C64200 C64210 C65100 C67300 C67400 C67410 C67600 C69300 C69400 C69430 C72900 (AMS 4596) C72900 (AMS 4597)
C72900 (AMS 4598) C83600 C83800 C84200 C84400 C84800 C85700 C86200 C86300 C86400 C86500 C86700 C87850 C89320 C89325 C89520 C89831 C89833 C89835 C89844 C90300 C90500 C90700
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C94700HT C94800 C95200 C95300 C95300HT C95400 C95400HT C95410 C95410HT C95500 C95500HT C95510 C95520HT C95600 C95800 C95900 C96400 C96900HT C97300 C97600 C97800 C99500
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