Copper Alloy C82700
UNS C82700
C82700 is a cast beryllium copper with a nickel addition for added strength, hardness and thermal stability, supplied as M, TB00, TF00 and TF00-CAST.
Reference datasheet — C82700 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
C82700 tempers and conditions
C82700 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 state — choose for rough machining, straightening or welding before final ageing. | 205 | 480 | 20 | 150 HB | 17 % IACS |
Thermomechanically controlled processed | Raw foundry condition — used only as a starting point for machining before solution/age treatment. | 340 | 550 | 6 | 14 HRC | 18 % IACS |
TF00 | Cost-saving route for thick, dimensionally sensitive castings — slightly lower and less uniform hardness than full solution + age. | 830 | 930 | 2 | 35 HRC | 20 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard supply condition for mould inserts, bearings and wear parts needing maximum hardness with good heat conduction. | 1,000 | 1,105 | 1.5 | 40 HRC | 21 % IACS |
What is C82700?
C82700 is a cast beryllium copper with a nickel addition for added strength, hardness and thermal stability, supplied as M, TB00, TF00 and TF00-CAST. Aged material reaches 1000 MPa yield, 1105 MPa tensile and 370 HB (40 HRC), the top of the cast high-copper range, and is used for mould and bearing bodies working to about 220 °C. The trade-offs are 1.5 % elongation, essentially no formability after aging, 105 W/m·K and 21 % IACS conductivity, machinability of 40 and beryllium handling requirements. C82400 is the nearest alternative where slightly lower hardness is acceptable. C82700 has a density of 8.26 g/cm³ (0.298 lb/in³), lighter than 83% of copper alloy grades. It melts at 866°C (1,591 °F). C82700 has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,105 MPa (160 ksi) — stronger than 99% of copper alloy grades. Elongation at break is 1.5% and the elastic modulus is 128 GPa (18.6 Msi).
What is C82700 used for?
- molds
- bearings
- high-temperature bushings
- wear components
Advantages
- High strength — 1,000 MPa (145 ksi), better than 99% of copper alloy grades
Limitations
- Limited ductility — 1.5%, worse than 98% of copper alloy grades
- High embodied carbon — 8 kg CO₂/kg, worse than 98% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
C82700 properties
Typical room-temperature values for C82700-TF00; bars are the position among copper alloy grades.
Physical3
C82700 has a density of 8.26 g/cm³ (0.298 lb/in³), lighter than 83% of copper alloy grades. It melts at 866°C (1,591 °F).
Mechanical14
C82700 has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,105 MPa (160 ksi) — stronger than 99% of copper alloy grades. Elongation at break is 1.5% and the elastic modulus is 128 GPa (18.6 Msi).
Thermal6
C82700 is rated for continuous service to 220°C (428 °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 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
C82700 conducts electricity at 21 % IACS, better than 53% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C82700 takes about 110 MJ of energy and emits 8 kg of CO₂ — more than 97% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C82700's machinability is fair (40/100, better than 57% of copper alloy grades); weldability fair (35/100); formability not recommended (10/100).
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. C82700 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C82700
Is C82700 easy to machine?
Machine in TB00 where possible; in TF00 use rigid setups, carbide/PCD tools, moderate speeds and flood coolant — beryllium dust and mist must be captured by local exhaust and wet methods.
Can C82700 be welded?
GTAW/EBW with matched Be-Cu filler is feasible on solution-annealed parts; always re-solution and re-age afterwards, and fume-extract because of BeO.
Can C82700 be formed, bent or molded?
Supplied as sand, investment or permanent-mould castings; the aged alloy is essentially non-formable, so shape must be achieved in casting plus machining.
C82700 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 |
|---|---|---|
| Beprincipal hardening element | 2.35 – 2.55 | 2.45 |
| Nigrain refiner / thermal stability (replaces Co) | 1 – 1.5 | 1.2 |
| Siimpurity limit | ≤ 0.15 | |
| Alimpurity limit | ≤ 0.15 | |
| Feimpurity limit | ≤ 0.25 | |
| Pbimpurity limit | ≤ 0.02 | |
| Curemainder, ≈95.5 % | balance |
What surface finishes work on C82700?
Polishes to a mirror mould finish; electroless nickel or hard chrome plating is common for wear/gas resistance — no anodising, and avoid ammonia-bearing cleaners.
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).
How much does C82700 cost?
C82700 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.
C82700 — frequently asked
What is C82700 used for?
C82700 is typically used for molds, bearings, high-temperature bushings and wear components. In short: hardest cast high-copper; be-Ni strengthened casting; mirror-polish mould alloy.
What is the yield strength of C82700?
C82700 has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,105 MPa (160 ksi) — stronger than 99% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C82700 easy to machine?
Not especially — machinability is rated fair (40/100, better than 57% of copper alloy grades). Machine in TB00 where possible; in TF00 use rigid setups, carbide/PCD tools, moderate speeds and flood coolant — beryllium dust and mist must be captured by local exhaust and wet methods.
Can C82700 be welded?
With care — weldability is rated fair (35/100). GTAW/EBW with matched Be-Cu filler is feasible on solution-annealed parts; always re-solution and re-age afterwards, and fume-extract because of BeO.
What surface finishes work on C82700?
Polishes to a mirror mould finish; electroless nickel or hard chrome plating is common for wear/gas resistance — no anodising, and avoid ammonia-bearing cleaners.
Can C82700 be formed, bent or molded?
Supplied as sand, investment or permanent-mould castings; the aged alloy is essentially non-formable, so shape must be achieved in casting plus machining.
What is the maximum service temperature of C82700?
C82700 is rated for continuous use to about 220°C (428 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C82700-TF00 and C82700-TB00?
TF00 is the default condition — standard supply condition for mould inserts, bearings and wear parts needing maximum hardness with good heat conduction. TB00: softest, most ductile state — choose for rough machining, straightening or welding before final ageing. Yield strength is 1,000 MPa in TF00 versus 205 MPa in TB00.
How much does C82700 cost?
C82700 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 B770 — Copper-Beryllium Alloy Sand Castings for General Applications — ASTM International (2019)
- CDA/UNS Alloy Datasheet C82700 — Copper Development Association (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.