Copper Alloy C80900
UNS C80900 · ASTM B369
C80900 is a high-copper casting grade to ASTM B369, deoxidized with boron so that weldability is retained alongside conductivity.
Reference datasheet — C80900 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 M01 condition
C80900 tempers and conditions
C80900 is supplied in 3 conditions, soft to hard. M01 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 |
|---|---|---|---|---|---|---|
M01Default As sand cast | Standard as-cast sand casting condition — the usual supply state for electrical and general engineering copper castings. | 62 | 172 | 40 | 44 HB | 92 % IACS |
As centrifugally cast | Chill-cast sections with finer grain — slightly higher strength and hardness than sand cast, for repeat-production electrical parts. | 70 | 190 | 35 | 48 HB | 92 % IACS |
As pressure die cast | Continuously cast bar/tube stock — soundest, densest structure; choose when machining pressure-tight or high-conductivity parts from stock. | 85 | 200 | 30 | 52 HB | 93 % IACS |
What is C80900?
C80900 is a high-copper casting grade to ASTM B369, deoxidized with boron so that weldability is retained alongside conductivity. It gives 92% IACS and 350 W/m·K with 62 MPa yield, 172 MPa tensile, 40% elongation and 44 HB, and its corrosion resistance makes it a choice for marine hardware and electrical fittings up to about 200 °C. Strength and hardness are low, and the alloy shrinks 4–5% while absorbing gas readily, so section design and feeding control the casting yield. C80700 and C80500 are the nearest substitutes. C80900 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,065°C (1,949 °F). C80900 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 172 MPa (24.9 ksi) — weaker than 99% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 115 GPa (16.7 Msi).
What is C80900 used for?
- Marine hardware castings
- Electrical fittings and terminals
- Deck and hull fastening hardware
- Heat-exchanger end castings
- Grounding and bonding hardware
- Conductive valve components
Advantages
- High electrical conductivity — 92 % IACS, better than 89% of copper alloy grades
- Conducts heat well — 350 W/m·K (202.2 BTU/hr·ft·°F), better than 88% of copper alloy grades
- Readily welded — 70/100, better than 85% of copper alloy grades
- Ductile — tolerates forming and impact — 40%, better than 84% of copper alloy grades
Limitations
- Low strength — 62 MPa (8.99 ksi), worse than 99% of copper alloy grades
- Difficult to machine — 20/100, worse than 98% of copper alloy grades
C80900 properties
Typical room-temperature values for C80900-M01; bars are the position among copper alloy grades.
Physical3
C80900 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,065°C (1,949 °F).
Mechanical13
C80900 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 172 MPa (24.9 ksi) — weaker than 99% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 115 GPa (16.7 Msi).
Thermal6
C80900 is rated for continuous service to 200°C (392 °F). It conducts heat at 350 W/m·K (202.2 BTU/hr·ft·°F), better than 88% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C80900 conducts electricity at 92 % IACS, better than 89% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C80900 takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C80900's machinability is poor (20/100, worse than 98% of copper alloy grades); weldability very good (70/100); formability fair (35/100).
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. C80900 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C80900
Is C80900 easy to machine?
Gummy and low rating (~20 % of free-cutting brass) — use sharp, high-rake, polished-flute tools, high speed, low feed and generous flood coolant to avoid built-up edge.
Can C80900 be welded?
Boron deoxidation gives good GTAW/GMAW weldability with ERCu filler, but high preheat (250–500 °C for thick sections) is required because of the huge thermal conductivity; braze and solder readily.
Can C80900 be formed, bent or molded?
Casting only: needs strong deoxidation/degassing, large risers and chills — pure copper shrinks ~4–5 % and gasses easily, so favour simple, uniformly thick sections.
C80900 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 |
|---|---|---|
| Bboron added as deoxidizer | 0.02 – 0.04 | 0.03 |
| CuCu (including Ag) 99.70 % min | ≥ 99.7 (balance) |
What surface finishes work on C80900?
Not anodizable; electroplate Ni/Ag/Sn for contact surfaces or apply clear lacquer/benzotriazole to slow tarnishing; polishes bright but is soft and scratches easily.
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 C80900 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B369
How much does C80900 cost?
C80900 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.
C80900 — frequently asked
What is C80900 used for?
C80900 is typically used for marine hardware castings, electrical fittings and terminals, deck and hull fastening hardware, heat-exchanger end castings, grounding and bonding hardware and conductive valve components. In short: boron-deoxidized cast copper; weldable conductive castings; corrosion-resistant copper grade.
What is the yield strength of C80900?
C80900 has a typical yield strength of 62 MPa (8.99 ksi) and a tensile strength of 172 MPa (24.9 ksi) — weaker than 99% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C80900 easy to machine?
Not especially — machinability is rated poor (20/100, worse than 98% of copper alloy grades). Gummy and low rating (~20 % of free-cutting brass) — use sharp, high-rake, polished-flute tools, high speed, low feed and generous flood coolant to avoid built-up edge.
Can C80900 be welded?
Yes — weldability is rated very good (70/100). Boron deoxidation gives good GTAW/GMAW weldability with ERCu filler, but high preheat (250–500 °C for thick sections) is required because of the huge thermal conductivity; braze and solder readily.
What surface finishes work on C80900?
Not anodizable; electroplate Ni/Ag/Sn for contact surfaces or apply clear lacquer/benzotriazole to slow tarnishing; polishes bright but is soft and scratches easily.
Can C80900 be formed, bent or molded?
Casting only: needs strong deoxidation/degassing, large risers and chills — pure copper shrinks ~4–5 % and gasses easily, so favour simple, uniformly thick sections.
What is the maximum service temperature of C80900?
C80900 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 C80900-M01 and C80900-M04?
M01 is the default condition — standard as-cast sand casting condition — the usual supply state for electrical and general engineering copper castings. M04: continuously cast bar/tube stock — soundest, densest structure; choose when machining pressure-tight or high-conductivity parts from stock. Yield strength is 62 MPa in M01 versus 85 MPa in M04.
How much does C80900 cost?
C80900 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
- Cast Copper Alloys — C80900 property listing — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASTM B824 — General Requirements for Copper Alloy Castings — ASTM International (2021)
- ASM Handbook Vol.13B — Corrosion: Materials (copper alloys) — ASM International (2005)
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.