Copper Alloy C82000-M
Heat-treated state
UNS C82000
M = thermomechanically controlled processed
Pick for parts that will be machined then heat treated later, or where moderate strength with easier machining is acceptable.
Values for the M condition
Other C82000 tempers and conditions
C82000 is listed in 3 conditions; see the grade overview at C82000.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution heat treated | Interim soft condition for straightening or heavy machining before precipitation aging to TF00. | 140 | 290 | 25 | 85 HB | 18 % IACS |
MThis page Thermomechanically controlled processed | Pick for parts that will be machined then heat treated later, or where moderate strength with easier machining is acceptable. | 152 | 311 | 20 | 95 HB | 30 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard delivered condition: best combination of strength, hardness and ~45–50% IACS conductivity for electrodes and conductive structural castings. | 500 | 655 | 5 | 22 HRC | 48 % IACS |
What is C82000-M?
C82000-M is C82000 heat treated to M — pick for parts that will be machined then heat treated later, or where moderate strength with easier machining is acceptable. C82000-M has a yield strength of 152 MPa (22 ksi) and a tensile strength of 311 MPa (45.1 ksi) — weaker than 67% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 124 GPa (18 Msi). C82000-M has a density of 8.61 g/cm³ (0.311 lb/in³), lighter than 58% of copper alloy grades. It melts at 1,030°C (1,886 °F). TF00 is the default condition FabDigit quotes; M is available on request or by drawing note.
Advantages
- Readily welded — 60/100, better than 76% of copper alloy grades
Limitations
- High embodied carbon — 5.5 kg CO₂/kg, worse than 89% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
C82000-M properties
Typical room-temperature values for C82000-M; 35 are specific to this condition. Other listed values are C82000 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C82000-M has a density of 8.61 g/cm³ (0.311 lb/in³), lighter than 58% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical14
C82000-M has a yield strength of 152 MPa (22 ksi) and a tensile strength of 311 MPa (45.1 ksi) — weaker than 67% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 124 GPa (18 Msi).
Thermal6
C82000-M is rated for continuous service to 250°C (482 °F). It conducts heat at 135 W/m·K (78 BTU/hr·ft·°F), better than 71% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C82000-M conducts electricity at 30 % IACS, better than 71% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C82000-M takes about 78 MJ of energy and emits 5.5 kg of CO₂ — more than 90% of copper alloy grades. Typical recycled content is 30%.
Manufacturability7
C82000-M's machinability is fair (45/100, better than 64% of copper alloy grades); weldability good (60/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C82000-M
Is C82000 easy to machine?
Machine mainly in as-cast or solution-treated condition with sharp carbide tools, positive rake and flood coolant; all Be-containing swarf/dust must be wet-collected and handled under OSHA/GB beryllium controls.
Can C82000 be welded?
GTAW/resistance welding is feasible with matching or Cu-Si filler, but the HAZ over-ages and must be re-solution treated and re-aged to recover properties; extract welding fume.
Can C82000 be formed, bent or molded?
Sand, permanent-mold, centrifugal and investment casting all work well; use good gating/risering because the alloy has a short freezing range and moderate shrinkage.
What surface finishes work on C82000?
Takes a fine polish and accepts nickel, silver or tin plating; pickle in dilute sulphuric/hydrogen-peroxide to remove the tenacious BeO scale before plating.
C82000 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 |
|---|---|---|
| Be | 0.45 – 0.8 | 0.6 |
| Cograin refiner; Ni may substitute in part per some specs | 2.4 – 2.7 | 2.55 |
| Si | ≤ 0.15 | — |
| Fe | ≤ 0.2 | — |
| Al | ≤ 0.15 | — |
| Pb | ≤ 0.02 | — |
| Cu95.0 % min including Ag | balance | — |
C82000-M — frequently asked
What is C82000-M used for?
C82000-M is typically used for electrical connectors, molds, bearing components and high-strength castings. In short: conductive high-strength Be-Cu casting; cobalt-refined cast structure; lower-Be, higher-conductivity casting.
What is the yield strength of C82000-M?
C82000-M has a typical yield strength of 152 MPa (22 ksi) and a tensile strength of 311 MPa (45.1 ksi) — weaker than 67% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C82000-M easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Machine mainly in as-cast or solution-treated condition with sharp carbide tools, positive rake and flood coolant; all Be-containing swarf/dust must be wet-collected and handled under OSHA/GB beryllium controls.
Can C82000-M be welded?
Yes — weldability is rated good (60/100). GTAW/resistance welding is feasible with matching or Cu-Si filler, but the HAZ over-ages and must be re-solution treated and re-aged to recover properties; extract welding fume.
What surface finishes work on C82000-M?
Takes a fine polish and accepts nickel, silver or tin plating; pickle in dilute sulphuric/hydrogen-peroxide to remove the tenacious BeO scale before plating.
Can C82000-M be formed, bent or molded?
Sand, permanent-mold, centrifugal and investment casting all work well; use good gating/risering because the alloy has a short freezing range and moderate shrinkage.
What is the maximum service temperature of C82000-M?
C82000-M is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C82000-TF00 and C82000-TB00?
TF00 is the default condition — standard delivered condition: best combination of strength, hardness and ~45–50% IACS conductivity for electrodes and conductive structural castings. TB00: interim soft condition for straightening or heavy machining before precipitation aging to TF00. Yield strength is 500 MPa in TF00 versus 140 MPa in TB00.
Sources
- ASTM B770 — Copper-Beryllium Alloy Sand Castings for General Applications — ASTM International (2019)
- CDA Alloy Datasheet C82000 (10C) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- Cast beryllium copper alloy data (Alloy 10C / 20C) — Materion / NGK (2022)
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.