Copper Alloy C82700-M
Heat-treated state
UNS C82700
M = thermomechanically controlled processed
Raw foundry condition — used only as a starting point for machining before solution/age treatment.
Values for the M condition
Other C82700 tempers and conditions
C82700 is listed in 4 conditions; see the grade overview at C82700.
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 |
MThis page 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-M?
C82700-M is C82700 heat treated to M — raw foundry condition — used only as a starting point for machining before solution/age treatment. C82700-M has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 71% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 128 GPa (18.6 Msi). C82700-M 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). TF00 is the default condition FabDigit quotes; M is available on request or by drawing note.
Limitations
- High embodied carbon — 8 kg CO₂/kg, worse than 98% of copper alloy grades
- Limited ductility — 6%, worse than 89% of copper alloy grades
C82700-M properties
Typical room-temperature values for C82700-M; 23 are specific to this condition. Other listed values are C82700 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C82700-M 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-M has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 71% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 128 GPa (18.6 Msi).
Thermal6
C82700-M is rated for continuous service to 200°C (392 °F). It conducts heat at 90 W/m·K (52 BTU/hr·ft·°F), better than 54% of copper alloy grades. Thermal expansion is 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
C82700-M conducts electricity at 18 % IACS, better than 51% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (63/100), better than 52% of copper alloy grades.
Sustainability4
Producing a kilogram of C82700-M 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-M's machinability is fair (45/100, better than 64% of copper alloy grades); weldability fair (40/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C82700-M
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.
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.
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 | — |
C82700-M — frequently asked
What is C82700-M used for?
C82700-M 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-M?
C82700-M has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 550 MPa (79.8 ksi) — stronger than 71% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C82700-M easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% 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-M be welded?
With care — weldability is rated fair (40/100). 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-M?
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-M 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-M?
C82700-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 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.