Manufacturer of custom machined parts, specializing in bronze and other alloys for your engineered applications
419.223.1075
1046 Greenlawn Ave, Lima OH 45804
NOW HIRING
COPPER-BASED ALLOYS
AMS 4596-C72900
CAST 4596-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 4597 and AMS 4598 specifications.
INFORMATION
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%
14.50-15.50
7.50 8.50
0.50
0.50
0.30
0.10
0.15
0.02
Rem.
MACHINABILITY
Copper Alloy UNS No.
Machinability Rating
Density(lb / in 3 at 68 °F)
AMS 4596-C72900
60
0.278
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
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


SPEC SHEET


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