Copper Alloy C82100
UNS C82100 · ASTM B824
C82100 is a cobalt-modified cast beryllium copper covered by ASTM B824, in which the cobalt addition refines the as-cast grain structure and the beryllium-rich phase provides age hardening.
Reference datasheet — C82100 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
C82100 tempers and conditions
C82100 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; choose for rough machining, straightening or forming before ageing. | 140 | 310 | 25 | 80 HB | 19 % IACS |
As centrifugally cast | Raw casting condition; used only as a starting stock for heat treatment or for low-stress parts. | 185 | 345 | 20 | 90 HB | 22 % IACS |
TF00 | Economical route for thick or complex castings where quench distortion must be avoided; strength somewhat below full TF00. | 415 | 550 | 8 | 10 HRC | 42 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard supply condition: peak strength and hardness with ~45 % IACS conductivity for electrodes, dies and structural castings. | 515 | 655 | 6 | 20 HRC | 45 % IACS |
What is C82100?
C82100 is a cobalt-modified cast beryllium copper covered by ASTM B824, in which the cobalt addition refines the as-cast grain structure and the beryllium-rich phase provides age hardening. In the aged condition it develops 515 MPa yield, 655 MPa tensile, 6% elongation and 200 HB (20 HRC, 96 HRB) while retaining 208 W/m·K thermal conductivity and 45% IACS, which suits cast mould bases, bushings and non-sparking tooling. Service is limited to about 200 °C, and machining, grinding or welding releases beryllium-bearing dust and fume that must be captured. Where higher hardness is needed in a casting, C82510 is the usual step up. C82100 has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 1,030°C (1,886 °F). C82100 has a yield strength of 515 MPa (74.7 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 131 GPa (19 Msi).
What is C82100 used for?
- Mold bases
- High-strength bushings
- Aerospace fittings
- Non-sparking tools
Advantages
- High strength — 515 MPa (74.7 ksi), better than 91% of copper alloy grades
- Stiff — 131 GPa (19 Msi), better than 91% of copper alloy grades
- Conducts heat well — 208 W/m·K (120.2 BTU/hr·ft·°F), better than 79% of copper alloy grades
- High electrical conductivity — 45 % IACS, better than 77% of copper alloy grades
Limitations
- High embodied carbon — 6.5 kg CO₂/kg, worse than 94% of copper alloy grades
- Limited ductility — 6%, worse than 89% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
C82100 properties
Typical room-temperature values for C82100-TF00; bars are the position among copper alloy grades.
Physical3
C82100 has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical14
C82100 has a yield strength of 515 MPa (74.7 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 131 GPa (19 Msi).
Thermal6
C82100 is rated for continuous service to 200°C (392 °F). It conducts heat at 208 W/m·K (120.2 BTU/hr·ft·°F), better than 79% of copper alloy grades. Thermal expansion is 17.8 µm/m·K (9.89 µin/in·°F).
Electrical3
C82100 conducts electricity at 45 % IACS, better than 77% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C82100 takes about 95 MJ of energy and emits 6.5 kg of CO₂ — more than 95% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C82100's machinability is fair (35/100, better than 51% of copper alloy grades); weldability fair (45/100); formability poor (15/100).
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. C82100 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C82100
Is C82100 easy to machine?
Machine in TB00 where possible; in TF00 use sharp carbide tooling, rigid setups, flood coolant and HEPA-filtered wet collection to control beryllium-bearing dust.
Can C82100 be welded?
GTAW/EBW/resistance welding are feasible with matching BeCu filler; re-solution treat and age after welding, and provide local fume extraction for Be.
Can C82100 be formed, bent or molded?
Sand, permanent-mould, investment and centrifugal casting all work well; feed heavily with risers and chills because of the wide freezing range and high thermal conductivity.
C82100 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 |
|---|---|---|
| Beprecipitation hardening element | 0.4 – 0.8 | 0.6 |
| Cograin refiner / co-precipitate; Co+Ni may be counted together | 2.35 – 2.7 | 2.5 |
| Nimay substitute part of Co | ≤ 0.3 | |
| Sideoxidizer / fluidity | 0.1 – 0.25 | 0.15 |
| Feimpurity limit | ≤ 0.2 | |
| Alimpurity limit | ≤ 0.1 | |
| Pbimpurity limit | ≤ 0.02 | |
| Curemainder, ~96.5 % | balance |
What surface finishes work on C82100?
Not anodizable — takes electroless/electrolytic Ni, Ag or Cr plating, chemical blackening and a high mechanical polish for mould inserts.
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 C82100 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B824
How much does C82100 cost?
C82100 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.
C82100 — frequently asked
What is C82100 used for?
C82100 is typically used for mold bases, high-strength bushings, aerospace fittings and non-sparking tools. In short: age-hardening cast BeCu; cobalt-refined cast grain; strength with 45% IACS.
What is the yield strength of C82100?
C82100 has a typical yield strength of 515 MPa (74.7 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 91% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C82100 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of copper alloy grades). Machine in TB00 where possible; in TF00 use sharp carbide tooling, rigid setups, flood coolant and HEPA-filtered wet collection to control beryllium-bearing dust.
Can C82100 be welded?
With care — weldability is rated fair (45/100). GTAW/EBW/resistance welding are feasible with matching BeCu filler; re-solution treat and age after welding, and provide local fume extraction for Be.
What surface finishes work on C82100?
Not anodizable — takes electroless/electrolytic Ni, Ag or Cr plating, chemical blackening and a high mechanical polish for mould inserts.
Can C82100 be formed, bent or molded?
Sand, permanent-mould, investment and centrifugal casting all work well; feed heavily with risers and chills because of the wide freezing range and high thermal conductivity.
What is the maximum service temperature of C82100?
C82100 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 C82100-TF00 and C82100-TB00?
TF00 is the default condition — standard supply condition: peak strength and hardness with ~45 % IACS conductivity for electrodes, dies and structural castings. TB00: softest, most ductile condition; choose for rough machining, straightening or forming before ageing. Yield strength is 515 MPa in TF00 versus 140 MPa in TB00.
How much does C82100 cost?
C82100 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 Copper Alloy Database — cast copper-beryllium alloys — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Cast copper-beryllium alloy property sheets — Materion (Brush Wellman) (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.