Copper Alloy C82400-M
Heat-treated state
UNS C82400
M = thermomechanically controlled processed
As-cast 1.65 %Be–Co beryllium copper casting: moderate strength and good ductility before solution/age hardening, excellent castability and high thermal conductivity for moulds and bearings.
Values for the M condition
Other C82400 tempers and conditions
C82400 is listed in 4 conditions; see the grade overview at C82400.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
MThis page Thermomechanically controlled processed | As-cast 1.65 %Be–Co beryllium copper casting: moderate strength and good ductility before solution/age hardening, excellent castability and high thermal conductivity for moulds and bearings. | 240 | 500 | 20 | 105 HB | 16 % IACS |
Solution heat treated | Intermediate condition supplied when the customer will straighten/machine soft and then precipitation-age to full hardness. | 240 | 480 | 30 | 130 HB | 17 % IACS |
As cast | Choose for tough, moderately strong castings where dimensional stability after aging is not needed or where the part will be machined then aged later. | 275 | 517 | 20 | 165 HB | 17 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard supply condition for mold inserts, cooling cores and heavy-duty bearings needing 35–41 HRC with ~20% IACS conductivity. | 895 | 1,035 | 1.5 | 38 HRC | 22 % IACS |
What is C82400-M?
C82400-M is C82400 heat treated to M — as-cast 1.65 %Be–Co beryllium copper casting: moderate strength and good ductility before solution/age hardening, excellent castability and high thermal conductivity for moulds and bearings. C82400-M has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 52% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 128 GPa (18.6 Msi). C82400-M has a density of 8.31 g/cm³ (0.3 lb/in³), lighter than 77% of copper alloy grades. It melts at 954°C (1,749 °F). TF00 is the default condition FabDigit quotes; M is available on request or by drawing note.
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 89% of copper alloy grades
C82400-M properties
Typical room-temperature values for C82400-M; 32 are specific to this condition. Other listed values are C82400 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C82400-M has a density of 8.31 g/cm³ (0.3 lb/in³), lighter than 77% of copper alloy grades. It melts at 954°C (1,749 °F).
Mechanical14
C82400-M has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 52% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 128 GPa (18.6 Msi).
Thermal6
C82400-M is rated for continuous service to 150°C (302 °F). It conducts heat at 80 W/m·K (46.2 BTU/hr·ft·°F), better than 50% of copper alloy grades. Thermal expansion is 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
C82400-M conducts electricity at 16 % IACS, worse than 52% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C82400-M takes about 80 MJ of energy and emits 5.5 kg of CO₂ — more than 91% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C82400-M's machinability is fair (50/100, better than 69% of copper alloy grades); weldability good (55/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C82400-M
Is C82400 easy to machine?
Machine with sharp carbide tooling, positive rake, rigid setups and flood coolant; capture all dust/chips under local exhaust because beryllium-containing particulate is a health hazard — rough soft (C/TB00) and finish after aging where accuracy allows.
Can C82400 be welded?
GTAW/PAW with matching Be-Cu filler works with preheat control and inert shielding, but the heat-affected zone loses aged strength, so re-solution-treat and re-age or accept local softening; fume extraction is mandatory.
Can C82400 be formed, bent or molded?
A casting alloy — pour in sand, permanent mold or centrifugal molds with good gating/feeding for the hot-short mushy range; not intended for cold forming after aging.
What surface finishes work on C82400?
Polishes to a high mold finish and takes electroless nickel, bright nickel or hard chrome plating; no anodizing — passivate or lacquer for tarnish control.
C82400 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 | 1.6 – 1.85 | 1.7 |
| Cograin refiner; Co+Ni may be reported together | 0.2 – 0.65 | 0.35 |
| Fe | ≤ 0.2 | — |
| Al | ≤ 0.15 | — |
| Si | ≤ 0.15 | — |
| CuCu + named elements ≥ 99.5 %; Cu remainder (~97.6–98.0 %) | balance | — |
C82400-M — frequently asked
What is C82400-M used for?
C82400-M is typically used for plastic injection molds, bearings, cams and wear parts. In short: high-hardness cast Be-Cu; mould-grade wear resistance; strength over conductivity.
What is the yield strength of C82400-M?
C82400-M has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 52% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C82400-M easy to machine?
Reasonably — machinability is rated fair (50/100, better than 69% of copper alloy grades). Machine with sharp carbide tooling, positive rake, rigid setups and flood coolant; capture all dust/chips under local exhaust because beryllium-containing particulate is a health hazard — rough soft (C/TB00) and finish after aging where accuracy allows.
Can C82400-M be welded?
Yes — weldability is rated good (55/100). GTAW/PAW with matching Be-Cu filler works with preheat control and inert shielding, but the heat-affected zone loses aged strength, so re-solution-treat and re-age or accept local softening; fume extraction is mandatory.
What surface finishes work on C82400-M?
Polishes to a high mold finish and takes electroless nickel, bright nickel or hard chrome plating; no anodizing — passivate or lacquer for tarnish control.
Can C82400-M be formed, bent or molded?
A casting alloy — pour in sand, permanent mold or centrifugal molds with good gating/feeding for the hot-short mushy range; not intended for cold forming after aging.
What is the maximum service temperature of C82400-M?
C82400-M is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C82400-TF00 and C82400-M?
TF00 is the default condition — standard supply condition for mold inserts, cooling cores and heavy-duty bearings needing 35–41 HRC with ~20% IACS conductivity. M: as-cast 1.65 %Be–Co beryllium copper casting: moderate strength and good ductility before solution/age hardening, excellent castability and high thermal conductivity for moulds and bearings. Yield strength is 895 MPa in TF00 versus 240 MPa in M.
Sources
- ASTM B770 — Copper-Beryllium Alloy Sand Castings for General Applications — ASTM International (2019)
- CDA Alloy Datasheet C82400 (Alloy 165C) — Copper Development Association / copper.org (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- Cast beryllium copper mold alloys (165C / 20C / 275C) technical data — Materion / NGK (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.