Copper Alloy C82400-C (As cast)
Supply condition
UNS C82400
Choose for tough, moderately strong castings where dimensional stability after aging is not needed or where the part will be machined then aged later.
Values for the C 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 |
|---|---|---|---|---|---|---|
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 |
CThis page 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-C?
C82400-C is C82400 supplied in the C condition — choose for tough, moderately strong castings where dimensional stability after aging is not needed or where the part will be machined then aged later. C82400-C has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 517 MPa (75 ksi) — stronger than 57% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 128 GPa (18.6 Msi). C82400-C has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 866°C (1,591 °F). TF00 is the default condition FabDigit quotes; C is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
Limitations
- High embodied carbon — 6 kg CO₂/kg, worse than 92% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
C82400-C properties
Typical room-temperature values for C82400-C; 16 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-C has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 866°C (1,591 °F).
Mechanical14
C82400-C has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 517 MPa (75 ksi) — stronger than 57% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 128 GPa (18.6 Msi).
Thermal6
C82400-C is rated for continuous service to 200°C (392 °F). It conducts heat at 84 W/m·K (48.5 BTU/hr·ft·°F), better than 51% of copper alloy grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
C82400-C conducts electricity at 17 % IACS, better than 50% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C82400-C takes about 90 MJ of energy and emits 6 kg of CO₂ — more than 93% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C82400-C's machinability is poor (30/100, worse than 67% 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-C
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-C — frequently asked
What is C82400-C used for?
C82400-C 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-C?
C82400-C has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 517 MPa (75 ksi) — stronger than 57% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C82400-C easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% 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-C 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-C?
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-C 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-C?
C82400-C 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 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.