Copper Alloy C81300-TB00
Heat-treated state
UNS C81300 · ASTM B824
TB00 = solution heat treated
Soft, ductile intermediate state for straightening, machining or forming before ageing.
Values for the TB00 condition
Other C81300 tempers and conditions
C81300 is listed in 3 conditions; see the grade overview at C81300.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
TB00This page Solution heat treated | Soft, ductile intermediate state for straightening, machining or forming before ageing. | 90 | 225 | 30 | 42 HB | 38 % IACS |
As centrifugally cast | Cheapest condition; use only where conductivity and shape matter and strength is not critical. | 105 | 235 | 22 | 50 HB | 45 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard supply condition: best combination of strength, hardness and high electrical/thermal conductivity. | 172 | 310 | 11 | 95 HB | 60 % IACS |
What is C81300-TB00?
C81300-TB00 is C81300 heat treated to TB00 — soft, ductile intermediate state for straightening, machining or forming before ageing. C81300-TB00 has a yield strength of 90 MPa (13.1 ksi) and a tensile strength of 225 MPa (32.6 ksi) — weaker than 88% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 124 GPa (18 Msi). C81300-TB00 has a density of 8.83 g/cm³ (0.319 lb/in³), heavier than 65% of copper alloy grades. It melts at 1,065°C (1,949 °F). TF00 is the default condition FabDigit quotes; TB00 is available on request or by drawing note.
Advantages
- Readily welded — 70/100, better than 85% of copper alloy grades
- Ductile — tolerates forming and impact — 30%, better than 75% of copper alloy grades
Limitations
- Low strength — 90 MPa (13.1 ksi), worse than 88% of copper alloy grades
C81300-TB00 properties
Typical room-temperature values for C81300-TB00; 19 are specific to this condition. Other listed values are C81300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C81300-TB00 has a density of 8.83 g/cm³ (0.319 lb/in³), heavier than 65% of copper alloy grades. It melts at 1,065°C (1,949 °F).
Mechanical11
C81300-TB00 has a yield strength of 90 MPa (13.1 ksi) and a tensile strength of 225 MPa (32.6 ksi) — weaker than 88% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 124 GPa (18 Msi).
Thermal6
C81300-TB00 is rated for continuous service to 200°C (392 °F). It conducts heat at 170 W/m·K (98.2 BTU/hr·ft·°F), better than 74% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C81300-TB00 conducts electricity at 38 % IACS, better than 73% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C81300-TB00 takes about 58 MJ of energy and emits 3.6 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C81300-TB00's machinability is fair (48/100, better than 68% of copper alloy grades); weldability very good (70/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C81300-TB00
Is C81300 easy to machine?
Machines like a tough medium-hard copper — gummy in TB00, better in TF00; use sharp positive-rake carbide, flood coolant and local exhaust to control beryllium-bearing dust.
Can C81300 be welded?
GTAW/GMAW with matching or Cu-Si filler works; preheat lightly, keep heat input low, and re-solution + re-age afterwards to restore aged properties; extract fume.
Can C81300 be formed, bent or molded?
A casting alloy — sand, investment and centrifugal casting all practical; design for feeding since it freezes over a narrow range, and only limited straightening/coining in TB00.
What surface finishes work on C81300?
Takes a good mechanical polish; nickel, silver or tin electroplating is common for contact surfaces; anodizing is not applicable.
C81300 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 |
|---|---|---|
| Beberyllium — precipitation hardener; toxic dust/fume | 0.02 – 0.1 | 0.06 |
| Coforms Co-Be precipitates, grain refiner | 0.3 – 0.55 | 0.45 |
| Si | ≤ 0.2 | — |
| CuCu + named elements 99.5 % min | ≥ 98.5 (balance) | — |
C81300-TB00 — frequently asked
What is C81300-TB00 used for?
C81300-TB00 is typically used for cast tooling requiring conductivity and hardness, electrical connector castings, resistance welding fixture components, mold inserts with heat extraction duty and cast current-carrying brackets. In short: age-hardening cast copper; better conductivity than C81400; beryllium-bearing foundry alloy.
What is the yield strength of C81300-TB00?
C81300-TB00 has a typical yield strength of 90 MPa (13.1 ksi) and a tensile strength of 225 MPa (32.6 ksi) — weaker than 88% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C81300-TB00 easy to machine?
Reasonably — machinability is rated fair (48/100, better than 68% of copper alloy grades). Machines like a tough medium-hard copper — gummy in TB00, better in TF00; use sharp positive-rake carbide, flood coolant and local exhaust to control beryllium-bearing dust.
Can C81300-TB00 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW with matching or Cu-Si filler works; preheat lightly, keep heat input low, and re-solution + re-age afterwards to restore aged properties; extract fume.
What surface finishes work on C81300-TB00?
Takes a good mechanical polish; nickel, silver or tin electroplating is common for contact surfaces; anodizing is not applicable.
Can C81300-TB00 be formed, bent or molded?
A casting alloy — sand, investment and centrifugal casting all practical; design for feeding since it freezes over a narrow range, and only limited straightening/coining in TB00.
What is the maximum service temperature of C81300-TB00?
C81300-TB00 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 C81300-TF00 and C81300-TB00?
TF00 is the default condition — standard supply condition: best combination of strength, hardness and high electrical/thermal conductivity. TB00: soft, ductile intermediate state for straightening, machining or forming before ageing. Yield strength is 172 MPa in TF00 versus 90 MPa in TB00.
Sources
- ASTM B824 — General Requirements for Copper Alloy Castings — ASTM (2021)
- ASTM B770 — Copper-Beryllium Alloy Castings — ASTM (2019)
- CDA alloy database (copper.org) — C81300 — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties of 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.