Copper Alloy C80300
UNS C80300 · ASTM B369
C80300 is a high-purity cast copper to ASTM B369, used as a conductor material in cast form rather than as a strengthened alloy.
Reference datasheet — C80300 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.
Values for the M01 condition
C80300 tempers and conditions
C80300 is supplied in 6 conditions, soft to hard. M01 is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Cast and annealed | Anneal after casting/machining when maximum conductivity, ductility and dimensional stability are required. | 55 | 165 | 45 | 40 HB | 101 % IACS |
M01Default As sand cast | Standard stocked condition for one-off and low-volume conductive copper castings. | 62 | 172 | 40 | 44 HB | 100 % IACS |
As investment cast | Pick for near-net-shape conductive parts with fine detail and minimal machining allowance. | 62 | 172 | 38 | 44 HB | 99 % IACS |
As centrifugally cast | Choose for rings, sleeves and bushings needing denser, more gas-free copper than sand casting. | 65 | 185 | 42 | 46 HB | 100 % IACS |
As plaster cast | Use for repeat-run parts where the finer chilled grain gives slightly higher strength and better surface. | 69 | 190 | 40 | 48 HB | 100 % IACS |
As continuous cast | Best choice for bar, tube and hollow stock: densest structure, highest conductivity and most consistent machining. | 70 | 195 | 40 | 50 HB | 100 % IACS |
What is C80300?
C80300 is a high-purity cast copper to ASTM B369, used as a conductor material in cast form rather than as a strengthened alloy. It provides 100% IACS electrical conductivity and 391 W/m·K thermal conductivity with 40% elongation, so it is specified where current-carrying capacity or heat transfer governs the design. Strength is low — 62 MPa yield, 172 MPa tensile, 44 HB — service is capped near 200 °C, and the metal is gassy with poor fluidity and high shrinkage in the foundry. Where slightly lower conductivity is acceptable and casting behaviour matters more, C80500 or C80900 are the normal alternatives. C80300 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,083°C (1,981 °F). C80300 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 172 MPa (24.9 ksi) — weaker than 99% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 117 GPa (17 Msi).
What is C80300 used for?
- Electrical conductor castings
- Heat-transfer and heat-sink castings
- Switchgear terminals and clamps
- Bus bar connectors
- Water-cooled furnace components
- Welding equipment jaws and holders
Advantages
- Conducts heat well — 391 W/m·K (225.9 BTU/hr·ft·°F), better than 98% of copper alloy grades
- High electrical conductivity — 100 % IACS, better than 96% of copper alloy grades
- Forms and bends easily — 85/100, better than 85% of copper alloy grades
- Ductile — tolerates forming and impact — 40%, better than 84% of copper alloy grades
Limitations
- Low strength — 62 MPa (8.99 ksi), worse than 99% of copper alloy grades
- Difficult to machine — 20/100, worse than 98% of copper alloy grades
C80300 properties
Typical room-temperature values for C80300-M01; bars are the position among copper alloy grades.
Physical3
C80300 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,083°C (1,981 °F).
Mechanical13
C80300 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 172 MPa (24.9 ksi) — weaker than 99% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C80300 is rated for continuous service to 200°C (392 °F). It conducts heat at 391 W/m·K (225.9 BTU/hr·ft·°F), better than 98% of copper alloy grades. Thermal expansion is 17.7 µm/m·K (9.83 µin/in·°F).
Electrical3
C80300 conducts electricity at 100 % IACS, better than 96% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C80300 takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 35%.
Manufacturability7
C80300's machinability is poor (20/100, worse than 98% of copper alloy grades); weldability fair (45/100); formability excellent (85/100).
Common Calculations5
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. C80300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C80300
Is C80300 easy to machine?
Gummy and stringy — use sharp, high-rake, polished-flute tools, high speed, low feed and flood coolant; expect ~20 % of 1212 free-machining rate.
Can C80300 be welded?
GTAW/GMAW with pure-Cu or deoxidized filler and 400–600 °C preheat because of the 390 W/m·K heat sink; keep interpass clean and avoid hydrogen pickup.
Can C80300 be formed, bent or molded?
Cast to shape only: pure copper is gassy with poor fluidity and high shrinkage, so use generous risers, chills, deoxidation (Li/B/P-free where conductivity matters) and thick sections.
C80300 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 |
|---|---|---|
| Agcounted with copper | — | |
| Other (total incidental)residual/incidental elements | ≤ 0.05 | 0.03 |
| CuCu + Ag ≥ 99.95 %, deoxidized; silver counted as copper | ≥ 99.95 (balance) |
What surface finishes work on C80300?
Solders and brazes readily; electroplate Ni/Sn/Ag for contact surfaces; bright-dip or lacquer polished parts since bare copper tarnishes quickly.
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).
Equivalent designations
Standards and trade names that resolve to Copper Alloy C80300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B369
How much does C80300 cost?
C80300 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.
C80300 — frequently asked
What is C80300 used for?
C80300 is typically used for electrical conductor castings, heat-transfer and heat-sink castings, switchgear terminals and clamps, bus bar connectors, water-cooled furnace components and welding equipment jaws and holders. In short: highest-conductivity cast copper; 100% IACS castings; ductile but low strength.
What is the yield strength of C80300?
C80300 has a typical yield strength of 62 MPa (8.99 ksi) and a tensile strength of 172 MPa (24.9 ksi) — weaker than 99% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C80300 easy to machine?
Not especially — machinability is rated poor (20/100, worse than 98% of copper alloy grades). Gummy and stringy — use sharp, high-rake, polished-flute tools, high speed, low feed and flood coolant; expect ~20 % of 1212 free-machining rate.
Can C80300 be welded?
With care — weldability is rated fair (45/100). GTAW/GMAW with pure-Cu or deoxidized filler and 400–600 °C preheat because of the 390 W/m·K heat sink; keep interpass clean and avoid hydrogen pickup.
What surface finishes work on C80300?
Solders and brazes readily; electroplate Ni/Sn/Ag for contact surfaces; bright-dip or lacquer polished parts since bare copper tarnishes quickly.
Can C80300 be formed, bent or molded?
Cast to shape only: pure copper is gassy with poor fluidity and high shrinkage, so use generous risers, chills, deoxidation (Li/B/P-free where conductivity matters) and thick sections.
What is the maximum service temperature of C80300?
C80300 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C80300-M01 and C80300-M07?
M01 is the default condition — standard stocked condition for one-off and low-volume conductive copper castings. M07: best choice for bar, tube and hollow stock: densest structure, highest conductivity and most consistent machining. Yield strength is 62 MPa in M01 versus 70 MPa in M07.
How much does C80300 cost?
C80300 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
- ASTM B369 — Copper-Nickel Alloy Castings / ASTM B824 Copper Alloy Casting General Requirements — ASTM International (2021)
- CDA Alloy Database — Cast Copper C80100/C80300 — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Specialty Handbook: Copper and Copper Alloys — ASM International (2001)
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.