Copper Alloy C82800
UNS C82800 · ASTM B824
C82800 is the highest-strength cast beryllium copper in the C80000–C82999 family, supplied under ASTM B824 as Alloy 275C and hardened by solution treatment plus ageing (M, M01, TB00, TF00 on file).
Reference datasheet — C82800 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 TF00 condition
C82800 tempers and conditions
C82800 is supplied in 4 conditions, soft to hard. TF00 is the default FabDigit quotes; the values on this page are for it.
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 |
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?
C82800 is the highest-strength cast beryllium copper in the C80000–C82999 family, supplied under ASTM B824 as Alloy 275C and hardened by solution treatment plus ageing (M, M01, TB00, TF00 on file). It provides 1000 MPa yield, 1069 MPa tensile, 400 HB (43 HRC), 131 GPa modulus and 105 W/m·K in cast form, so it is used for the most heavily loaded mould, wear and non-sparking tooling castings. Elongation is only 0.5 %, machinability is about 20 % of AISI 1212, service is limited to 200 °C and conductivity is 20 % IACS. C82600 is the nearest alternative when slightly easier machining is wanted. C82800 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). C82800 has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,069 MPa (155 ksi) — stronger than 99% of copper alloy grades. Elongation at break is 0.5% and the elastic modulus is 131 GPa (19 Msi).
What is C82800 used for?
- high-load mold components
- non-sparking safety tools
- heavy-duty bearing castings
Advantages
- High strength — 1,000 MPa (145 ksi), better than 99% of copper alloy grades
- 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 — 0.5%, worse than 100% of copper alloy grades
- Limited formability — 5/100, worse than 98% 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
C82800 properties
Typical room-temperature values for C82800-TF00; bars are the position among copper alloy grades.
Physical3
C82800 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 has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,069 MPa (155 ksi) — stronger than 99% of copper alloy grades. Elongation at break is 0.5% and the elastic modulus is 131 GPa (19 Msi).
Thermal6
C82800 is rated for continuous service to 200°C (392 °F). It conducts heat at 105 W/m·K (60.7 BTU/hr·ft·°F), better than 56% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C82800 conducts electricity at 20 % IACS, better than 52% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C82800 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's machinability is fair (35/100, better than 51% of copper alloy grades); weldability fair (40/100); formability not recommended (5/100).
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. C82800 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C82800
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.
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 |
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.
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 C82800 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B824
- Trade names
- Alloy 275C
How much does C82800 cost?
C82800 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.
C82800 — frequently asked
What is C82800 used for?
C82800 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?
C82800 has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,069 MPa (155 ksi) — stronger than 99% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C82800 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% 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 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?
Takes a high mold polish; commonly electroless-nickel or hard-chrome plated for corrosion/wear, and can be passivated — not anodizable.
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 is the maximum service temperature of C82800?
C82800 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.
How much does C82800 cost?
C82800 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 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; 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.