Copper Alloy C55282
UNS C55282
C55282 is a silver-phosphorus-copper brazing filler with a narrower and lower melting range than BCuP-4, intended for close-fit copper joints that must be brazed at reduced temperature.
Reference datasheet — C55282 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
C55282 tempers and conditions
C55282 is supplied in one standard condition, AS-BRAZED.
Supply forms, finishes and certifications
Ways C55282 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
BARE-RODDefault | Bare rod / wire | Supply form |
FLUX-COATED | Flux-coated rod | Supply form |
PREFORM | Ring / washer preform | Supply form |
STRIP | Strip / foil | Supply form |
PASTE | Powder / brazing paste | Printing process |
What is C55282?
C55282 is a silver-phosphorus-copper brazing filler with a narrower and lower melting range than BCuP-4, intended for close-fit copper joints that must be brazed at reduced temperature. It is supplied as bare rod, flux-coated rod, strip, stamped preforms and paste; as-brazed properties are about 260 MPa tensile strength, 3 % elongation and 110 HB. The alloy self-fluxes on copper but is brittle and must not be applied to steel, cast iron or nickel alloys, where iron and nickel phosphides form. Where a wider melting range and more ductility are acceptable, BCuP-4-type C55281 is the nearest alternative. C55282 has a density of 8.2 g/cm³ (0.296 lb/in³), lighter than 85% of copper alloy grades. It melts at 645°C (1,193 °F). C55282 has a tensile strength of 260 MPa (37.7 ksi), weaker than 80% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 100 GPa (14.5 Msi).
What is C55282 used for?
- close-tolerance copper tube joints
- refrigeration systems
- electronic component brazing
Limitations
- High embodied carbon — 14 kg CO₂/kg, worse than 100% of copper alloy grades
- Hard to polish — 50/100, worse than 99% of copper alloy grades
- Difficult to weld — 10/100, worse than 98% of copper alloy grades
- Limited ductility — 3%, worse than 97% of copper alloy grades
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
C55282 properties
Typical room-temperature values; bars are the position among copper alloy grades.
Physical3
C55282 has a density of 8.2 g/cm³ (0.296 lb/in³), lighter than 85% of copper alloy grades. It melts at 645°C (1,193 °F).
Mechanical7
C55282 has a tensile strength of 260 MPa (37.7 ksi), weaker than 80% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
C55282 is rated for continuous service to 150°C (302 °F). It conducts heat at 50 W/m·K (28.9 BTU/hr·ft·°F), worse than 66% of copper alloy grades. Thermal expansion is 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
C55282 conducts electricity at 10 % IACS, worse than 74% of copper alloy grades.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C55282 takes about 125 MJ of energy and emits 14 kg of CO₂ — more than 98% of copper alloy grades. Typical recycled content is 25%.
Manufacturability6
C55282's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability not recommended (10/100); formability poor (20/100).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C55282 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C55282
Is C55282 easy to machine?
Not a structural machining alloy; the Cu-P eutectic phase makes it hard and brittle, so cut preforms by shearing/stamping rather than turning.
Can C55282 be welded?
Used as a filler, not welded — never apply to steel, cast iron or nickel alloys, where brittle iron/nickel phosphides form.
Can C55282 be formed, bent or molded?
Limited cold ductility: drawn to rod/wire and rolled to thin strip in the mill, but avoid tight field bending of rods.
C55282 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Ag | 4.8 – 5.2 | 5 |
| P | 6.5 – 7 | 6.8 |
| Other (total)total of all other elements per AWS A5.8 | ≤ 0.15 | |
| Cu | balance |
What surface finishes work on C55282?
Joints self-flux on copper and need only light cleaning; residues from fluxed brass/bronze joints must be washed off to prevent corrosion.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
How much does C55282 cost?
C55282 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C55282 — frequently asked
What is C55282 used for?
C55282 is typically used for close-tolerance copper tube joints, refrigeration systems and electronic component brazing. In short: lowest brazing temperature phos-copper; narrow melting range; suited to capillary-gap joints.
What is the tensile strength of C55282?
C55282 has a typical tensile strength of 260 MPa (37.7 ksi) — weaker than 80% of copper alloy grades.
Is C55282 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Not a structural machining alloy; the Cu-P eutectic phase makes it hard and brittle, so cut preforms by shearing/stamping rather than turning.
Can C55282 be welded?
Not readily — weldability is rated not recommended (10/100). Used as a filler, not welded — never apply to steel, cast iron or nickel alloys, where brittle iron/nickel phosphides form.
What surface finishes work on C55282?
Joints self-flux on copper and need only light cleaning; residues from fluxed brass/bronze joints must be washed off to prevent corrosion.
Can C55282 be formed, bent or molded?
Limited cold ductility: drawn to rod/wire and rolled to thin strip in the mill, but avoid tight field bending of rods.
What is the maximum service temperature of C55282?
C55282 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does C55282 cost?
C55282 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- AWS A5.8M/A5.8 Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- ASM Handbook Vol. 6, Welding, Brazing and Soldering — ASM International (1993)
- Copper Alloy UNS C55282 data — Copper Development Association (copper.org) (2023)
- GB/T 6418 (2008)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.