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C64200, C642 Silicon Aluminum Bronze (AMS 4634)
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C64200, C642 Silicon Aluminum Bronze (AMS 4634)


C64200 Silicon Aluminum Bronze is an engineering alloy at least as resistant to corrosion as copper itself, but much stronger. CDA 642 bronze is manufactured mostly in the form of round, hexagonal, and octagonal rods for hot forming and free machining. C642 is considered to be of the best valve stem alloys. Other applications include gears, marine hardware, nuts, pole line hardware, and valve bodies and components.

  • EU Designation: CuAl7Si2, CW302G

  • ASTM B150, ASTM B249, QQ-C-465, AMS 4634, SAE J461, SAE J463

Typical Uses for C64200 Silicon Aluminum Bronze:

AUTOMOTIVE: Valve Guides, Automobile Engine

ELECTRICAL: Pole Line Hardware

FASTENERS: Bolts, Nuts

INDUSTRIAL: Valve Components, Valve Bodies, Gears, Valve Stems, Cams

MARINE: Hardware

Sizes Available From Aviva Metals 

SOLID BAR . . . . . . . . . . 3/16" - 8" diameter

HEX BAR . . . . . . . . . . . . 5/8" - 2 1/2" across the flats

Specifications

End Product Specification
Bar AMS 4634, ASME SB150, ASTM B150
Bar, Forging ASTM B124
Bolts ASTM F468
Forgings, Die AMS 4634, ASME SB283, ASTM B283
Nuts ASTM F467
Rod AMS 4631, ASME SB150, ASTM B150, SAE J463, J461
Rod, Forging ASTM B124
Screws ASTM F468
Shapes ASTM B150
Shapes, Forging ASTM B124
Studs ASTM F468

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Chemical Composition
Temper
Mechanical Properties
Physical Properties
Fabrication
Al As Cu Fe Pb Mn Ni Si Sn Zn
Min/Max 6.3 - 7.6 0.15 Rem 0.3 0.05 0.1 0.25 1.5 - 2.2 0.2 0.5
Nominals 7.0000 - 91.2000 - - - - 1.8000 - -
Product Type Temper Type
Bar AMS 4634, ASME SB150, ASTM B150
Bar, Forging ASTM B124
Bolts ASTM F468
Forgings, Die AMS 4634, ASME SB283, ASTM B283
Nuts ASTM F467
Rod AMS 4634, ASME SB150, ASTM B150, SAE J463, J461
Rod, Forging ASTM B124
Screws ASTM F468
Shapes ASTM B150
Shapes, Forging ASTM B124
Studs ASTM F468
Temper Sect. Size Cold Work Type Min Temp Tensile Strength YS
0.05% UL 		YS
0.02% Offset 		YS
0.005% Offset 		Elong. RH
B 		RH
C 		RH
F 		RH
30T 		VH
500 		BH
500 		BH
3000 		Shear
Strgth 		Fatigue
Strgth 		Izod
Impact
Strgth
- in. % - F ksi ksi ksi ksi % B C F 30T 500 500 3000 ksi ksi ft-lb
- mm. - - C MPa MPa MPa MPa - - - - - - - - MPa MPa J
Bar
M30 0.75 68 75 35 - - - - - - - - - - - -
M30 19 0 TYP 20 517 241 - - 32 77 - - - - - - - - 0
Forgings
M10 2.01 68 79 38 - - - - - - - - - - - -
M10 51 0 TYP 20 545 262 - - 30 78 - - - - - - - - 0
Rod
M30 0.75 68 75 35 - - - - - - - - - - - -
M30 19 0 TYP 20 517 241 - - 32 77 - - - - - - - - 0
H04 1.5 68 93 60 - - - - - - - - - - - -
H04 38 10 TYP 20 641 414 - - 26 90 - - - - - - - - 0
H04 0.75 68 102 68 - - - - - - - - - - 59 50
H04 19 15 TYP 20 703 469 - - 22 94 - - - - - - 407 345 0
O50 0.75 68 90 55 - - - - - - - - - - - -
O50 19 0 TYP 20 621 379 - - 28 89 - - - - - - - - 0
O50 0.5 68 92 58 - - - - - - - - - - - -
O50 12.7 0 TYP 20 634 400 - - 22 98 - - - - - - - - 0
Product Property US Customary Metric
Coefficient of Thermal Expansion 10.0 . 10-6 per oF (68-572 F) 18.0 . 10-6 per oC (20-300 C)
Density 0.278 lb/in3 at 68 F 7.7 gm/cm3 @ 20 C
Electrical Conductivity 8 %IACS @ 68 F 0.047 MegaSiemens/cm @ 20 C
Electrical Resistivity 113.0 ohms-cmil/ft @ 68 F 18.79 microhm-cm @ 20 C
Melting Point - Liquidus 1840 F 1004 C
Melting Point - Solidus 1800 F 982 C
Modulas of Elasticity in Tension 16000 ksi 110000 MPa
Modulus of Rigidity 6000 ksi 41370 MPa
Specific Gravity 7.69 7.69
Specific Heat Capacity 0.09 Btu/lb/ . oF at 68F 377.1 J/kg . oK at 293 K
Thermal Conductivity 26.0 Btu . ft/(hr . ft2 . oF)at 68F 45.0 W/m . oK at 20 C
Joining Technique Suitability
Brazing Fair
Butt Weld Fair
Capacity for Being Cold Worked Poor
Capacity for Being Hot Formed Excellent
Coated Metal Arc Welding Fair
Gas Shielded Arc Welding Fair
Machinability Rating 80
Oxyacetylene Welding Not Recommended
Seam Weld Fair
Soldering Not Recommended
Spot Weld Fair

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