Copper Alloy C82500-TB00
Heat-treated state
UNS C82500 · ASTM B824
TB00 = solution heat treated
Softest, toughest condition; used for rough machining, straightening or weld repair before ageing.
Values for the TB00 condition
Other C82500 tempers and conditions
C82500 is listed in 5 conditions; see the grade overview at C82500.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
TB00This page Solution heat treated | Softest, toughest condition; used for rough machining, straightening or weld repair before ageing. | 205 | 480 | 25 | 115 HB | 17 % IACS |
As sand cast | C82500 (Alloy 20C) beryllium-copper castings in the as-cast condition: moderate strength with useful ductility, retaining full response to later solution + precipitation hardening. | 262 | 517 | 15 | 180 HB | 18 % IACS |
As Cast | Pick for non-critical castings or as the supply state before machining and later age hardening. | 275 | 517 | 20 | 160 HB | 18 % IACS |
As-cast + aged | Economical route for large or dimensionally sensitive castings: moderate hardness gain without quench distortion. | 690 | 860 | 2 | 32 HRC | 20 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard supply condition for mold inserts and wear parts: maximum strength and hardness with good thermal conductivity. | 1,000 | 1,105 | 1 | 40 HRC | 20 % IACS |
What is C82500-TB00?
C82500-TB00 is C82500 heat treated to TB00 — softest, toughest condition; used for rough machining, straightening or weld repair before ageing. C82500-TB00 has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 53% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 128 GPa (18.6 Msi). C82500-TB00 has a density of 8.26 g/cm³ (0.298 lb/in³), lighter than 83% of copper alloy grades. It melts at 857°C (1,575 °F). TF00 is the default condition FabDigit quotes; TB00 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 — 8.5 kg CO₂/kg, worse than 98% of copper alloy grades
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
C82500-TB00 properties
Typical room-temperature values for C82500-TB00; 19 are specific to this condition. Other listed values are C82500 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C82500-TB00 has a density of 8.26 g/cm³ (0.298 lb/in³), lighter than 83% of copper alloy grades. It melts at 857°C (1,575 °F).
Mechanical15
C82500-TB00 has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 53% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 128 GPa (18.6 Msi).
Thermal6
C82500-TB00 is rated for continuous service to 150°C (302 °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
C82500-TB00 conducts electricity at 17 % IACS, better than 50% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C82500-TB00 takes about 130 MJ of energy and emits 8.5 kg of CO₂ — more than 99% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C82500-TB00's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability good (55/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C82500-TB00
Is C82500 easy to machine?
Machine with sharp carbide at moderate speed and generous flood coolant; aged material cuts like 40 HRC steel — use wet methods and local exhaust to control beryllium-bearing particulate.
Can C82500 be welded?
GTAW with matching BeCu filler and preheat works for repair, but the joint must be re-solution treated and re-aged to recover properties; fume extraction is mandatory.
Can C82500 be formed, bent or molded?
Supplied as sand/shell/investment castings with good fluidity; age hardening after rough machining minimizes distortion, and cold forming of the aged alloy is not practical.
What surface finishes work on C82500?
Polishes to a high mold finish; commonly electroless nickel or hard chrome plated for release and corrosion protection — not anodizable.
C82500 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 | 1.9 – 2.15 | 2 |
| CoCo (or Co+Ni) as grain refiner / hardener | 0.35 – 0.7 | 0.5 |
| Si | 0.2 – 0.35 | 0.28 |
| Fe | ≤ 0.25 | — |
| Al | ≤ 0.15 | — |
| Pb | ≤ 0.02 | — |
| Curemainder, ~96.5 % | balance | — |
C82500-TB00 — frequently asked
What is C82500-TB00 used for?
C82500-TB00 is typically used for plastic injection mold cores, die-casting dies and bearing and bushing castings. In short: hardest cast beryllium copper; mould-grade heat removal; 40 HRC after ageing.
What is the yield strength of C82500-TB00?
C82500-TB00 has a typical yield strength of 205 MPa (29.7 ksi) and a tensile strength of 480 MPa (69.6 ksi) — weaker than 53% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C82500-TB00 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Machine with sharp carbide at moderate speed and generous flood coolant; aged material cuts like 40 HRC steel — use wet methods and local exhaust to control beryllium-bearing particulate.
Can C82500-TB00 be welded?
Yes — weldability is rated good (55/100). GTAW with matching BeCu filler and preheat works for repair, but the joint must be re-solution treated and re-aged to recover properties; fume extraction is mandatory.
What surface finishes work on C82500-TB00?
Polishes to a high mold finish; commonly electroless nickel or hard chrome plated for release and corrosion protection — not anodizable.
Can C82500-TB00 be formed, bent or molded?
Supplied as sand/shell/investment castings with good fluidity; age hardening after rough machining minimizes distortion, and cold forming of the aged alloy is not practical.
What is the maximum service temperature of C82500-TB00?
C82500-TB00 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 C82500-TF00 and C82500-TB00?
TF00 is the default condition — standard supply condition for mold inserts and wear parts: maximum strength and hardness with good thermal conductivity. TB00: softest, toughest condition; used for rough machining, straightening or weld repair before 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 (2019)
- ASTM B824 — General Requirements for Copper Alloy Castings — ASTM (2021)
- C82500 alloy datasheet (CDA UNS listing) — Copper Development Association (copper.org) (2023)
- Alloy 20C cast beryllium copper — Materion Brush Performance Alloys (2022)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 15 — Casting — ASM International (2008)
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.