Copper Alloy C81300
UNS C81300 · ASTM B824
C81300 is a low-beryllium cast high-copper alloy (ASTM B824) available as-cast (M02), solution treated (TB00) or aged (TF00); the small beryllium addition gives an age-hardening response with better conductivity than higher-Be cast alloys such as C81400.
Reference datasheet — C81300 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
C81300 tempers and conditions
C81300 is supplied in 3 conditions, soft to hard. TF00 is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
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?
C81300 is a low-beryllium cast high-copper alloy (ASTM B824) available as-cast (M02), solution treated (TB00) or aged (TF00); the small beryllium addition gives an age-hardening response with better conductivity than higher-Be cast alloys such as C81400. It is used for cast tooling and electrical connector castings that must combine conductivity with moderate hardness. Aged values are 172 MPa yield, 310 MPa tensile, 11 % elongation, 95 HB (55 HRB), 60 % IACS, 250 W/m·K and service to 350 °C. Beryllium-bearing dust and fume require extraction and controlled handling. C81300 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). C81300 has a yield strength of 172 MPa (24.9 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 60% of copper alloy grades. Elongation at break is 11% and the elastic modulus is 128 GPa (18.6 Msi).
What is C81300 used for?
- Cast tooling requiring conductivity and hardness
- Electrical connector castings
- Resistance welding fixture components
- Mold inserts with heat extraction duty
- Cast current-carrying brackets
Advantages
- High service temperature — 350°C (662 °F), better than 95% of copper alloy grades
- Conducts heat well — 250 W/m·K (144.4 BTU/hr·ft·°F), better than 81% of copper alloy grades
- High electrical conductivity — 60 % IACS, better than 81% of copper alloy grades
- Readily welded — 60/100, better than 76% of copper alloy grades
C81300 properties
Typical room-temperature values for C81300-TF00; bars are the position among copper alloy grades.
Physical3
C81300 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 has a yield strength of 172 MPa (24.9 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 60% of copper alloy grades. Elongation at break is 11% and the elastic modulus is 128 GPa (18.6 Msi).
Thermal6
C81300 is rated for continuous service to 350°C (662 °F). It conducts heat at 250 W/m·K (144.4 BTU/hr·ft·°F), better than 81% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C81300 conducts electricity at 60 % IACS, better than 81% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C81300 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's machinability is fair (35/100, better than 51% of copper alloy grades); weldability good (60/100); formability poor (25/100).
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. C81300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C81300
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.
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) |
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.
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 C81300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B824
How much does C81300 cost?
C81300 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.
C81300 — frequently asked
What is C81300 used for?
C81300 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?
C81300 has a typical yield strength of 172 MPa (24.9 ksi) and a tensile strength of 310 MPa (45 ksi) — weaker than 60% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C81300 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% 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 be welded?
Yes — weldability is rated good (60/100). 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?
Takes a good mechanical polish; nickel, silver or tin electroplating is common for contact surfaces; anodizing is not applicable.
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 is the maximum service temperature of C81300?
C81300 is rated for continuous use to about 350°C (662 °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.
How much does C81300 cost?
C81300 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 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; 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.