Copper Alloy C86800
UNS C86800
C86800 is a nickel-modified manganese bronze — a cast high-strength brass in the UNS C86000 series with manganese, aluminium, iron and nickel additions rather than tin.
Reference datasheet — C86800 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
C86800 tempers and conditions
C86800 is supplied in 4 conditions, soft to hard. M01 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M01Default As sand cast | Default stocked/most-produced condition: general-purpose sand castings to ASTM B584. | 290 | 565 | 20 | 150 HB | 7.5 % IACS |
As centrifugally cast | Choose for rings, sleeves and bushings needing denser, more uniform structure than sand cast. | 305 | 590 | 22 | 155 HB | 7.5 % IACS |
As plaster cast | Use for repeat production of small/medium parts where finer grain and better surface than sand cast are wanted. | 305 | 585 | 20 | 155 HB | 7.5 % IACS |
As continuous cast | Pick for stock bar, tube and hollow bar to be machined into bushings and hydraulic components. | 315 | 600 | 18 | 160 HB | 7.5 % IACS |
What is C86800?
C86800 is a nickel-modified manganese bronze — a cast high-strength brass in the UNS C86000 series with manganese, aluminium, iron and nickel additions rather than tin. In the default condition it reaches 290 MPa yield, 565 MPa tensile, 20 % elongation and 150 HB with service to 200 °C, which is why it is specified for sand, centrifugal and continuous castings that must carry load in seawater and hydraulic duty. The limits are fabrication rather than strength: machinability is about 35 % of free-cutting brass, fusion welding is difficult because of zinc fume and hot cracking, and the alloy is dezincification-sensitive. C95800 nickel-aluminium bronze is the usual alternative when weld repair or higher seawater resistance is required. C86800 has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 88% of copper alloy grades. It melts at 875°C (1,607 °F). C86800 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 565 MPa (81.9 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 105 GPa (15.2 Msi).
What is C86800 used for?
- Marine propeller parts
- Valve bodies
- Pump components
- Gears
Limitations
- Hard to polish — 65/100, worse than 87% of copper alloy grades
- Poor heat conductor — 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades
- Low electrical conductivity — 7.5 % IACS, worse than 84% of copper alloy grades
C86800 properties
Typical room-temperature values for C86800-M01; bars are the position among copper alloy grades.
Physical3
C86800 has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 88% of copper alloy grades. It melts at 875°C (1,607 °F).
Mechanical15
C86800 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 565 MPa (81.9 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal5
C86800 is rated for continuous service to 200°C (392 °F). It conducts heat at 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades. Thermal expansion is 20.5 µm/m·K (11.4 µin/in·°F).
Electrical3
C86800 conducts electricity at 7.5 % IACS, worse than 84% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C86800 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 65%.
Manufacturability7
C86800's machinability is fair (35/100, better than 51% of copper alloy grades); weldability poor (30/100).
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. C86800 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C86800
Is C86800 easy to machine?
Machines like tough manganese bronze: rating ~30% of free-cutting brass — use rigid setups, positive-rake carbide, moderate speeds and generous coolant; chips are stringy, not free-breaking.
Can C86800 be welded?
Fusion welding is difficult (zinc fume, porosity, hot cracking); prefer GTAW/GMAW repair with matched or aluminium-bronze filler, low heat input and preheat control, or braze/mechanical joining.
Can C86800 be formed, bent or molded?
Casting alloy only — good fluidity but wide freezing range, so use tapered risers, chills and clean degassed melt; no cold forming, hot working is limited.
C86800 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 |
|---|---|---|
| Cu | 53.5 – 57 | 55 |
| Mn | 2.5 – 4 | 3.2 |
| NiNi+Co | 2.5 – 4 | 3.2 |
| Fe | 1 – 2.5 | 1.8 |
| Al | ≤ 2 | 1 |
| Sn | ≤ 1 | |
| Pb | ≤ 0.4 | |
| Znremainder, typically 32–36% | balance |
What surface finishes work on C86800?
Not anodizable; finish by shot blasting, grinding/polishing to a bright yellow-gold surface, or electroplate nickel/chrome/tin; seawater parts often left bare or epoxy coated.
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).
How much does C86800 cost?
C86800 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.
C86800 — frequently asked
What is C86800 used for?
C86800 is typically used for marine propeller parts, valve bodies, pump components and gears. In short: high-strength marine bronze; 565 MPa cast tensile; difficult to weld.
What is the yield strength of C86800?
C86800 has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 565 MPa (81.9 ksi) — stronger than 60% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C86800 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of copper alloy grades). Machines like tough manganese bronze: rating ~30% of free-cutting brass — use rigid setups, positive-rake carbide, moderate speeds and generous coolant; chips are stringy, not free-breaking.
Can C86800 be welded?
Not readily — weldability is rated poor (30/100). Fusion welding is difficult (zinc fume, porosity, hot cracking); prefer GTAW/GMAW repair with matched or aluminium-bronze filler, low heat input and preheat control, or braze/mechanical joining.
What surface finishes work on C86800?
Not anodizable; finish by shot blasting, grinding/polishing to a bright yellow-gold surface, or electroplate nickel/chrome/tin; seawater parts often left bare or epoxy coated.
Can C86800 be formed, bent or molded?
Casting alloy only — good fluidity but wide freezing range, so use tapered risers, chills and clean degassed melt; no cold forming, hot working is limited.
What is the maximum service temperature of C86800?
C86800 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 C86800-M01 and C86800-M07?
M01 is the default condition — default stocked/most-produced condition: general-purpose sand castings to ASTM B584. M07: pick for stock bar, tube and hollow bar to be machined into bushings and hydraulic components. Yield strength is 290 MPa in M01 versus 315 MPa in M07.
How much does C86800 cost?
C86800 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 B584 — Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- ASTM B271 — Copper-Base Alloy Centrifugal Castings — ASTM International (2020)
- CDA UNS alloy datasheet C86800 — Copper Development Association (copper.org) (2024)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
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.