CDA 521 Technical Data
CDA 521 is a copper-tin filler metal used for brazing ferrous alloys, such as steel. This alloy is typically used in furnace brazing of steels where use of pure copper is no permissible.
CDA 521 has good wetting characteristics on ferrous based materials, particular steel in furnace brazing applications. Maximum strength and joint integrity are obtained where joint clearance falls within the range of 0.003in. – 0.005in. per side.
Properties of Brazed Joints
The properties of a brazed joint are dependent upon numerous factors including base metal properties, joint design, metallurgical interaction between the base metal and the filler metal.
CDA 521 alloy conforms to: Unified Numbering System (UNS) C52100
Wire, strip, engineered preforms, specialty preforms per customer specification, powder and paste.
- AWS: RCuSn-C
- Lucas: CDA 521
- PI: CDA 521
- UNS: C52100
- Brazing Temperature Range High: 1980 F / 1082 C
- Brazing Temperature Range Low: 1930 F / 1054 C
- Liquidus: 1880 F / 1027 C
- Solidus: 1620 F / 882 C
- Cu: 92%
- Sn: 7.7%
- P: 0.35%
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