Copper Alloy C80300-M05
Finish state
UNS C80300 · ASTM B369
M05 = as plaster cast
Use for repeat-run parts where the finer chilled grain gives slightly higher strength and better surface.
Values for the M05 condition
Other C80300 tempers and conditions
C80300 is listed in 6 conditions; see the grade overview at C80300.
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 |
M05This page 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-M05?
C80300-M05 is C80300 supplied in the M05 condition — use for repeat-run parts where the finer chilled grain gives slightly higher strength and better surface. C80300-M05 has a yield strength of 69 MPa (10 ksi) and a tensile strength of 190 MPa (27.6 ksi) — weaker than 96% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 117 GPa (17 Msi). C80300-M05 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). M01 is the default condition FabDigit quotes; M05 is available on request or by drawing note.
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
- Difficult to machine — 20/100, worse than 98% of copper alloy grades
- Low strength — 69 MPa (10 ksi), worse than 96% of copper alloy grades
C80300-M05 properties
Typical room-temperature values for C80300-M05; 19 are specific to this condition. Other listed values are C80300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C80300-M05 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-M05 has a yield strength of 69 MPa (10 ksi) and a tensile strength of 190 MPa (27.6 ksi) — weaker than 96% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C80300-M05 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-M05 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-M05 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-M05's machinability is poor (20/100, worse than 98% of copper alloy grades); weldability fair (45/100); formability excellent (85/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C80300-M05
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.
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.
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) | — |
C80300-M05 — frequently asked
What is C80300-M05 used for?
C80300-M05 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-M05?
C80300-M05 has a typical yield strength of 69 MPa (10 ksi) and a tensile strength of 190 MPa (27.6 ksi) — weaker than 96% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C80300-M05 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-M05 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-M05?
Solders and brazes readily; electroplate Ni/Sn/Ag for contact surfaces; bright-dip or lacquer polished parts since bare copper tarnishes quickly.
Can C80300-M05 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-M05?
C80300-M05 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.