Copper Alloy C82400
UNS C82400
C82400 (Alloy 165C) is a cast beryllium copper with intermediate beryllium content that responds strongly to solution treatment and aging, available as C, M, TB00 and TF00.
Reference datasheet — C82400 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
C82400 tempers and conditions
C82400 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 |
|---|---|---|---|---|---|---|
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?
C82400 (Alloy 165C) is a cast beryllium copper with intermediate beryllium content that responds strongly to solution treatment and aging, available as C, M, TB00 and TF00. Aged castings reach 895 MPa yield, 1035 MPa tensile and 340 HB (38 HRC), which is why it is specified for mould cores, bearings and wear parts loaded to about 230 °C. Elongation is only 1.5 % and formability is minimal, thermal conductivity drops to 105 W/m·K at 22 % IACS, and beryllium dust and fume require exposure controls. C82000 is the lower-strength, higher-conductivity option; C82700 is the higher-hardness one. C82400 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). C82400 has a yield strength of 895 MPa (130 ksi) and a tensile strength of 1,035 MPa (150 ksi) — stronger than 98% of copper alloy grades. Elongation at break is 1.5% and the elastic modulus is 128 GPa (18.6 Msi).
What is C82400 used for?
- plastic injection molds
- bearings
- cams
- wear parts
Advantages
- High strength — 895 MPa (130 ksi), better than 98% of copper alloy grades
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
Limitations
- Limited ductility — 1.5%, worse than 98% of copper alloy grades
- 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 properties
Typical room-temperature values for C82400-TF00; bars are the position among copper alloy grades.
Physical3
C82400 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 has a yield strength of 895 MPa (130 ksi) and a tensile strength of 1,035 MPa (150 ksi) — stronger than 98% of copper alloy grades. Elongation at break is 1.5% and the elastic modulus is 128 GPa (18.6 Msi).
Thermal6
C82400 is rated for continuous service to 230°C (446 °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 µm/m·K (9.44 µin/in·°F).
Electrical3
C82400 conducts electricity at 22 % IACS, better than 55% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C82400 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's machinability is fair (40/100, better than 57% of copper alloy grades); weldability fair (45/100); 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. C82400 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C82400
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.
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 |
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.
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 C82400 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- Alloy 165C
How much does C82400 cost?
C82400 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.
C82400 — frequently asked
What is C82400 used for?
C82400 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?
C82400 has a typical yield strength of 895 MPa (130 ksi) and a tensile strength of 1,035 MPa (150 ksi) — stronger than 98% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C82400 easy to machine?
Not especially — machinability is rated fair (40/100, better than 57% 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 be welded?
With care — weldability is rated fair (45/100). 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?
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 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?
C82400 is rated for continuous use to about 230°C (446 °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.
How much does C82400 cost?
C82400 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 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; 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.