- Home/
- Copper Alloys /
- Copper Alloy C773
C773 Nickel Silver
Nominal Chemical Composition
⇩ Product Data Sheet
Download Datasheet (PDF) ⇩ Safety Data Sheet
Download SDS(PDF) INTRODUCTION
Aufhauser Nickel Silver is a low-fuming, cadmium-free bronze. It is an excellent replacement for high cost silver brazing alloys when higher brazing temperatures are acceptable. The weld deposits of Aufhauser Nickel Silver have very high tensile strength, good ductility and excellent corrosion resistance. Nickel Silver weld deposits are also machinable and work-harden when put into service. Suitable for tubular structures.
Nickel Silver is available pre-flux coated with the correct amount of flux. No dipping or preparatory work is necessary. Preheating may be desired for some applications. A neutral or slightly oxidizing flame is recommended. (Unsuitable for furnace brazing in a protective atmosphere.)
ADVANTAGES
- Joints are made at lower temperature than in gas or arc welding
- Minimizes thermal stress and distortion
- Less susceptibility to cracking
- Soft and ductile weld deposits
- Easy machinability
- Low residual stress
- High strength fillets
- Requires only simple, mobile equipment
APPLICATIONS
- Brazing tungsten carbides, copper alloys, nickel alloys, stainless steels & carbon steels
- Brazing or oxyacetylene welding of steel or cast iron where good color match is desired
- Building-up or overlaying worn parts such as gear teeth, bearings, and valve seats
GENERAL INFORMATION
Chemical Composition | Copper | Aluminum | Nickel | Lead | Phoshporus | Silicon | Zinc |
| 46.0-50.0 | 0.01 | 9.0-11.0 | 0.05 | 0.25 | 0.04-0.25 | Remainder |
Note: Copper contains Silver; Nickel contains Cobalt
ADDITIONAL INFORMATION
Copper and its alloys require a relatively high heat input with shortened welding time. Higher preheat temperatures and faster welding rates than for steel are necessary.
PHYSICAL and MECHANICAL PROPERTIES
| Melting Point | 1680°F (916°C) |
| Solidification | 1665°F (907°C) |
| Tensile Strength | 70,000 psi, avg. |
| Elongation in 2" | 25% |
| Brinell Hardness | 120 |
SPECIFICATIONS MEET or EXCEED |
| AWS A5.8 Class RBCuZn-D |
| ASME SFA5.8 Class RBCuZn-D |
| DIN 8513 L CuNi10Zn42 |
| QQ-R-571D |
| QQ-B-650 (BCuZn-D) |
| MIL-R-19631B Type RCuZn-D |
STANDARD SIZES AND DIAMETERS
| Diameters: 1/16", 3/32", 1/8", 3/16", 1/4" |
| Lengths: 18"or 36" |
FABRICATION PROPERTIES
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Excellent |
| Capacity for Being Cold Worked | Fair |
| Capacity for Being Hot Formed | Good |
| Machinability Rating | 20 |
COMMON FABRICATION PROCESSES
TYPICAL USES FOR ALLOY C773
| Product Category | Product | Reason Category | Reason |
| Architecture | Architectural Shapes | Appearance | Color |
| Architectural Shapes | Friction & Wear Properties | Wear Parts |
| Architectural Shapes | Mechanical Properties | High Strength |
| Elevators | Appearance | Color |
| Elevators | Corrosion Resistance | Corrosion Resistance |
| Elevators | Friction & Wear Properties | Wear Parts |
| Elevators | Mechanical Properties | High Strength |
| Handrails | Appearance | Color |
| Handrails | Friction & Wear Properties | Wear Parts |
| Thresholds | Appearance | Color |
| Thresholds | Friction & Wear Properties | Wear Parts |
| Industrial | Carbide Tips to Saw Blades | Appearance | Silver Color |
| Carbide Tips to Saw Blades | Corrosion Resistance | Corrosion Resistance |
| Carbide Tips to Saw Blades | Friction & Wear Properties | Bearing Surfaces |
| Carbide Tips to Saw Blades | Mechanical Properties | Stronger than other Brazing Alloys |
| Carbide Tips to Snow Plow Blades | Appearance | Silver Color |
| Carbide Tips to Snow Plow Blades | Corrosion Resistance | Corrosion Resistance |
| Carbide Tips to Snow Plow Blades | Friction & Wear Properties | Bearing Surfaces |
| Carbide Tips to Snow Plow Blades | Mechanical Properties | Stronger than other Brazing Alloys |
| Oil Drilling Equip: Welding Rod for Oxyfuel Gas Welding | Appearance | Silver Color |
| Oil Drilling Equip: Welding Rod for Oxyfuel Gas Welding | Conductivity (Electrical) | Electrical Conductivity |
| Oil Drilling Equip: Welding Rod for Oxyfuel Gas Welding | Conductivity (Thermal) | Thermal Conductivity |
| Oil Drilling Equip: Welding Rod for Oxyfuel Gas Welding | Corrosion Resistance | Corrosion Resistance |
| Oil Drilling Equip: Welding Rod for Oxyfuel Gas Welding | Friction & Wear Properties | Bearing Surfaces |
| Oil Drilling Equip: Welding Rod for Oxyfuel Gas Welding | Mechanical Properties | Stronger than other Brazing Alloys |
