C64200, C642 Silicon Aluminum Bronze (AMS 4634)
ASTM B150, ASTM B249, QQ-C-465, AMS 4634, SAE J461, SAE J463
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 |
| SOLID BAR | 3/16" - 8" diameter |
| HEX BAR | 5/8" - 2 1/2" across the flats |
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
Product 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 |
Chemical Composition
| 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 | - | - |
Temper
| 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 |
Mechanical Properties
| 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 |
Physical Properties
| 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 |
Fabrication
| 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 |
Our Services
Aviva Metals Houston warehouse operation is a AS9120B, and AS9100D in our Ohio foundry, based on ISO 9001:2015. We are now also offering our complete range of brass, bronze and copper alloys in precision machined or milled parts, in full accordance with your drawings. Aviva Metals creates custom precision bearings and bushings, flanges, washers, double flange bearings, full half bearings, spacers and special machined parts that can be shipped on a global basis and in full accordance with most international standards.
