#681
Also known as low-fuming bronze, this alloy provides versatility without the higher cost of silver brazing alloys. Works best for induction or torch brazing. Excellent results on ferrous and non-ferrous base metals.
#681 is a versatile copper brazing alloy suited for the joining of steel, copper, copper alloys, nickel, nickel based alloys, and stainless steel where corrosion resistance is not a major requirement. This copper brazing alloy has gained popularity as an economical alternative to silver brazing alloys.
Most commonly brazed via torch or induction, it is best to keep the heat cycle to a minimum to prevent vaporizing the zinc. Flux is required when brazing with #681.
Specifications
| Material | Low Fuming Bronze |
| Melting Pt. | 1590 ºF 866 ºC |
| Flow Pt. | 1630 ºF 888 ºC |
| MBT | 1750 |
| AWS A5.8 | RBCuZn-C |
| AWS | R-CUZNC |
| MIL | R-19631 |
| Federal Specification | QQ-B-571a |
| ASTM | B 259 |
| Preform Options | Brazing Discs Brazing Rings Brazing Shims Brazing Washers Custom Shapes Cutoffs Edgewounds |
| Resale Options | Brazing Paste Brazing Rod (Flux Coating Available) Brazing Strip Brazing Wire Spooled Brazing Material |
| Approx. Wire Length (BCuP/lb.) (BAg/Tr.oz) | 1097 in; 0.062 diameter 4386 in; 0.031 diameter 487 in; 0.093 diameter |
Physical Constants
| Solidus | 1590 ºF 866 ºC |
| Liquidus | 1630 ºF 888 ºC |
| Recommended Braze Temperature | 1750 ºF |
| Density | 0.302 lb./cu.in |
| Color | Bronze |
Applications
Suitable for ferrous and non-ferrous applications. Often an economical alternative to silver brazing alloys.
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Bellman-Melcor distinguishes itself as a provider of premium quality brazing alloys at industry competitive prices. Our extensive inventory of brazing and soldering alloys ensures that in most cases your order can be available for immediate delivery.
Compare With
- AWS: RBCuZn-C
- UNS: C68100
Specifications
- Brazing Temperature Range High: 1730 F / 943 C
- Brazing Temperature Range Low: 1680 F / 916 C
- Liquidus: 1630 F / 888 C
- Solidus: 1590 F / 866 C
Composition
- Cu: 58%
- Zn: 39.95%
- Sn: 0.95%
- Fe: 0.75%
- Mn: 0.255%
- Si: 0.095%
The information and recommendations contained in this publication have been provided without charge & compiled from sources believed to be reliable and to represent the best information available on the subject at the time of issue. No warranty, guarantee, or representation is made by the Prince and Izant Company, Inc. as to the absolute correctness or sufficiency of any representation contained in this and other publications; Prince and Izant Company, Inc. assumes no responsibility in connection therewith; nor can it be assumed that all acceptable safety measures are contained in this and other publications, or that other or additional measures may not be required under particular or exceptional conditions or circumstances. The company and product names referenced herein are for identification purposes only. All trademarks and registered trademarks are the property of their respective owners.