Copper Alloy C81800-TB00
Heat-treated state
UNS C81800 · ASTM B824
TB00 = solution heat treated
Softest, most ductile condition; used for rough machining, straightening or repair welding before ageing.
Values for the TB00 condition
Other C81800 tempers and conditions
C81800 is listed in 3 conditions; see the grade overview at C81800.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
TB00This page Solution heat treated | Softest, most ductile condition; used for rough machining, straightening or repair welding before ageing. | 150 | 330 | 28 | 90 HB | 22 % IACS |
As sand cast | Pick when the casting will be machined heavily and heat treated later, or where strength is secondary. | 190 | 380 | 20 | 105 HB | 30 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard supplied condition: peak strength and hardness with ~45% IACS conductivity for molds, electrodes and wear parts. | 550 | 725 | 8 | 23 HRC | 45 % IACS |
What is C81800-TB00?
C81800-TB00 is C81800 heat treated to TB00 — softest, most ductile condition; used for rough machining, straightening or repair welding before ageing. C81800-TB00 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 28% and the elastic modulus is 134 GPa (19.4 Msi). C81800-TB00 has a density of 8.61 g/cm³ (0.311 lb/in³), lighter than 58% of copper alloy grades. It melts at 1,016°C (1,861 °F). TF00 is the default condition FabDigit quotes; TB00 is available on request or by drawing note.
Advantages
- Stiff — 134 GPa (19.4 Msi), better than 93% of copper alloy grades
- Readily welded — 65/100, better than 80% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- High embodied carbon — 5 kg CO₂/kg, worse than 86% of copper alloy grades
C81800-TB00 properties
Typical room-temperature values for C81800-TB00; 12 are specific to this condition. Other listed values are C81800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C81800-TB00 has a density of 8.61 g/cm³ (0.311 lb/in³), lighter than 58% of copper alloy grades. It melts at 1,016°C (1,861 °F).
Mechanical14
C81800-TB00 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 28% and the elastic modulus is 134 GPa (19.4 Msi).
Thermal6
C81800-TB00 is rated for continuous service to 150°C (302 °F). It conducts heat at 120 W/m·K (69.3 BTU/hr·ft·°F), better than 66% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C81800-TB00 conducts electricity at 22 % IACS, better than 55% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C81800-TB00 takes about 70 MJ of energy and emits 5 kg of CO₂ — more than 84% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C81800-TB00's machinability is fair (45/100, better than 64% of copper alloy grades); weldability good (65/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C81800-TB00
Is C81800 easy to machine?
Machine soft (TB00) where possible and finish after ageing with sharp carbide tools, positive rake and flood coolant; all cutting must use local exhaust and wet methods to control beryllium-bearing particulate.
Can C81800 be welded?
GTAW/GMAW with matching BeCu filler works well; weld in the solution-treated state and re-solution + re-age afterward, with fume extraction mandatory.
Can C81800 be formed, bent or molded?
Sand, permanent-mold, centrifugal and investment casting all practical; feed heavily with chills/risers because of the high thermal conductivity and moderate solidification range.
What surface finishes work on C81800?
Ages to a hard surface that takes a mirror polish for mold inserts; can be electroplated (Ni, Cr) or chemically passivated — avoid anodizing and avoid ammonia-containing cleaners.
C81800 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 | 0.4 – 0.7 | 0.55 |
| CoCo may be partly replaced by Ni in some castings | 0.3 – 0.65 | 0.45 |
| Agcounted with Cu toward the 95% Cu min | 0.9 – 1.1 | 1 |
| Si | ≤ 0.15 | — |
| Al | ≤ 0.1 | — |
| Fe | ≤ 0.1 | — |
| Cu95.0 % min including Ag | balance | — |
C81800-TB00 — frequently asked
What is C81800-TB00 used for?
C81800-TB00 is typically used for injection mold inserts, wear plates, bearing bushings and welding fixtures. In short: strongest cast beryllium copper here; mould inserts with high conductivity; service to 300 °C.
What is the yield strength of C81800-TB00?
C81800-TB00 has a typical yield strength of 150 MPa (21.8 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 69% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C81800-TB00 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Machine soft (TB00) where possible and finish after ageing with sharp carbide tools, positive rake and flood coolant; all cutting must use local exhaust and wet methods to control beryllium-bearing particulate.
Can C81800-TB00 be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW with matching BeCu filler works well; weld in the solution-treated state and re-solution + re-age afterward, with fume extraction mandatory.
What surface finishes work on C81800-TB00?
Ages to a hard surface that takes a mirror polish for mold inserts; can be electroplated (Ni, Cr) or chemically passivated — avoid anodizing and avoid ammonia-containing cleaners.
Can C81800-TB00 be formed, bent or molded?
Sand, permanent-mold, centrifugal and investment casting all practical; feed heavily with chills/risers because of the high thermal conductivity and moderate solidification range.
What is the maximum service temperature of C81800-TB00?
C81800-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 C81800-TF00 and C81800-TB00?
TF00 is the default condition — standard supplied condition: peak strength and hardness with ~45% IACS conductivity for molds, electrodes and wear parts. TB00: softest, most ductile condition; used for rough machining, straightening or repair welding before ageing. Yield strength is 550 MPa in TF00 versus 150 MPa in TB00.
Sources
- ASTM B770 — Copper-Beryllium Alloy Sand Castings for General Applications — ASTM International (2019)
- ASTM B824 — General Requirements for Copper Alloy Castings — ASTM International (2021)
- CDA/UNS Alloy Datasheet C81800 — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Cast Beryllium Copper Alloys — properties and heat treatment — 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.