Copper Alloy C82800-M
Heat-treated state
UNS C82800 · ASTM B824
M = thermomechanically controlled processed
Raw casting condition — moderate strength, used only as a starting point before solution/aging or for low-stress parts.
Values for the M condition
Other C82800 tempers and conditions
C82800 is listed in 4 conditions; see the grade overview at C82800.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution heat treated | Softest, most ductile condition — used for rough machining, straightening or repair welding before precipitation aging. | 240 | 520 | 12 | 155 HB | 14 % IACS |
MThis page Thermomechanically controlled processed | Raw casting condition — moderate strength, used only as a starting point before solution/aging or for low-stress parts. | 310 | 552 | 1 | 200 HB | 17 % IACS |
As sand cast | As-cast C82800 (Cu-2.6Be-Co-Si) with partially precipitated beryllium: strong and hard straight from the mould but brittle, and normally solution treated plus aged before service. | 310 | 552 | 1 | 200 HB | 16 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard supply condition for tooling: maximum hardness (~43 HRC) and >1000 MPa strength with useful thermal conductivity. | 1,000 | 1,069 | 0.5 | 43 HRC | 20 % IACS |
What is C82800-M?
C82800-M is C82800 heat treated to M — raw casting condition — moderate strength, used only as a starting point before solution/aging or for low-stress parts. C82800-M has a yield strength of 310 MPa (45 ksi) and a tensile strength of 552 MPa (80.1 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 1% and the elastic modulus is 131 GPa (19 Msi). C82800-M has a density of 8.25 g/cm³ (0.298 lb/in³), lighter than 84% of copper alloy grades. It melts at 857°C (1,575 °F). TF00 is the default condition FabDigit quotes; M is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
- Stiff — 131 GPa (19 Msi), better than 91% of copper alloy grades
Limitations
- Limited ductility — 1%, worse than 99% of copper alloy grades
- High embodied carbon — 8.5 kg CO₂/kg, worse than 98% of copper alloy grades
- Low fracture toughness — 20 MPa·√m (18.2 ksi·√in), worse than 97% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
C82800-M properties
Typical room-temperature values for C82800-M; 15 are specific to this condition. Other listed values are C82800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C82800-M has a density of 8.25 g/cm³ (0.298 lb/in³), lighter than 84% of copper alloy grades. It melts at 857°C (1,575 °F).
Mechanical15
C82800-M has a yield strength of 310 MPa (45 ksi) and a tensile strength of 552 MPa (80.1 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 1% and the elastic modulus is 131 GPa (19 Msi).
Thermal6
C82800-M is rated for continuous service to 200°C (392 °F). It conducts heat at 78 W/m·K (45.1 BTU/hr·ft·°F), better than 50% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C82800-M conducts electricity at 17 % IACS, better than 50% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C82800-M takes about 130 MJ of energy and emits 8.5 kg of CO₂ — more than 99% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C82800-M's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability fair (40/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C82800-M
Is C82800 easy to machine?
Machinability ~20 % of AISI 1212; use sharp carbide tooling, rigid setups and flood coolant with HEPA/wet dust control — beryllium-bearing dust and fines are a health hazard.
Can C82800 be welded?
GTAW/GMAW with matching BeCu filler is possible but the weld and HAZ must be re-solutionized and re-aged; forced ventilation and fume extraction are mandatory.
Can C82800 be formed, bent or molded?
Shaped by sand, permanent-mold or investment casting only; the aged material has <1 % elongation and cannot be cold formed — do all machining before final aging where possible.
What surface finishes work on C82800?
Takes a high mold polish; commonly electroless-nickel or hard-chrome plated for corrosion/wear, and can be passivated — not anodizable.
C82800 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 | 2.5 – 2.75 | 2.6 |
| CoCo, or Co+Ni ≥ 0.35 | 0.35 – 0.65 | 0.5 |
| Si | 0.2 – 0.35 | 0.28 |
| Nicounted with Co | ≤ 0.3 | — |
| FeCo+Ni+Fe ≤ 0.70 | ≤ 0.25 | — |
| Al | ≤ 0.15 | — |
| Pb | ≤ 0.02 | — |
| Curemainder, ≈95.5 % | balance | — |
C82800-M — frequently asked
What is C82800-M used for?
C82800-M is typically used for high-load mold components, non-sparking safety tools and heavy-duty bearing castings. In short: highest-strength cast BeCu; maximum hardness, minimum ductility; non-sparking safety tooling.
What is the yield strength of C82800-M?
C82800-M has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 552 MPa (80.1 ksi) — stronger than 64% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C82800-M easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Machinability ~20 % of AISI 1212; use sharp carbide tooling, rigid setups and flood coolant with HEPA/wet dust control — beryllium-bearing dust and fines are a health hazard.
Can C82800-M be welded?
With care — weldability is rated fair (40/100). GTAW/GMAW with matching BeCu filler is possible but the weld and HAZ must be re-solutionized and re-aged; forced ventilation and fume extraction are mandatory.
What surface finishes work on C82800-M?
Takes a high mold polish; commonly electroless-nickel or hard-chrome plated for corrosion/wear, and can be passivated — not anodizable.
Can C82800-M be formed, bent or molded?
Shaped by sand, permanent-mold or investment casting only; the aged material has <1 % elongation and cannot be cold formed — do all machining before final aging where possible.
What is the maximum service temperature of C82800-M?
C82800-M 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 C82800-TF00 and C82800-TB00?
TF00 is the default condition — standard supply condition for tooling: maximum hardness (~43 HRC) and >1000 MPa strength with useful thermal conductivity. TB00: softest, most ductile condition — used for rough machining, straightening or repair welding before precipitation aging. Yield strength is 1,000 MPa in TF00 versus 240 MPa in TB00.
Sources
- ASTM B824 — Standard Specification for General Requirements for Copper Alloy Castings — ASTM International (2022)
- ASTM B770 — Copper-Beryllium Alloy Sand Castings for General Applications — ASTM International (2019)
- CDA/UNS C82800 Alloy Datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Cast Beryllium Copper Alloys — Technical Data — Materion Brush Performance Alloys (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.