Copper Alloy C86300
UNS C86300
C86300 is a high-strength cast manganese bronze — commercially called manganese bronze, metallurgically a high-zinc brass alloyed with aluminium, iron and manganese — reaching about 820 MPa tensile, 470 MPa yield and 225 HB as cast, the strongest of the standard cast copper alloys.
Values for the As Cast condition
C86300 tempers and conditions
C86300 is supplied in 4 conditions, soft to hard. As Cast 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 |
|---|---|---|---|---|---|---|
M07 | Choose for solid or hollow bar stock to be machined into nuts, bushings and worm gears; finer, denser structure than sand cast. | 460 | 800 | 14 | 19 HRC | 8 % IACS |
As CastDefault sand cast, no heat treatment (ASTM B584) | Standard stocked condition for gears, nuts and bearing plates; highest availability, properties per ASTM B584. | 470 | 820 | 15 | 225 HB | 8 % IACS |
M04 | Preferred for large-diameter rings, worm-gear rims and thick sleeves; dense, porosity-free wall with properties equal to or above sand cast. | 475 | 830 | 15 | 20 HRC | 8 % IACS |
M02 | Use for repeat production of smaller parts where chilled, fine-grained structure raises strength and hardness slightly. | 480 | 840 | 14 | 21 HRC | 8 % IACS |
What is C86300?
C86300 is a high-strength cast manganese bronze — commercially called manganese bronze, metallurgically a high-zinc brass alloyed with aluminium, iron and manganese — reaching about 820 MPa tensile, 470 MPa yield and 225 HB as cast, the strongest of the standard cast copper alloys. It is specified for heavy-duty worm gears, screw-down nuts, bridge bearing plates, hydraulic cylinder parts and mill bushings carrying high contact stress, in as-cast, permanent-mould, centrifugal and continuous cast forms. Limits are poor machinability (score 25, roughly 8 % of free-cutting brass), limited ductility and impact toughness, and sensitivity to dezincification and stress-corrosion cracking; avoid ammonia atmospheres and stagnant seawater, where C95500 is the usual substitute. C86300 has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 91% of copper alloy grades. It melts at 862°C (1,584 °F). C86300 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 87% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 103 GPa (14.9 Msi).
What is C86300 used for?
- Heavy-duty worm gears and worm wheels
- Screw-down and lead-screw nuts
- Bridge and structural bearing plates
- Hydraulic cylinder components
- Rolling mill bearings and bushings
- Manganese bronze gears
- Heavily loaded bushings and slide plates
Advantages
- Lightweight — 7.65 g/cm³ (0.276 lb/in³), better than 91% of copper alloy grades
- High strength — 470 MPa (68.2 ksi), better than 87% of copper alloy grades
Limitations
- Needs corrosion protection — 45/100, worse than 98% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Poor heat conductor — 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
- Low electrical conductivity — 8 % IACS, worse than 81% of copper alloy grades
C86300 properties
Typical room-temperature values for C86300-As Cast; bars are the position among copper alloy grades.
Physical3
C86300 has a density of 7.65 g/cm³ (0.276 lb/in³), lighter than 91% of copper alloy grades. It melts at 862°C (1,584 °F).
Mechanical14
C86300 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 87% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C86300 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 19.3 µm/m·K (10.7 µin/in·°F).
Electrical3
C86300 conducts electricity at 8 % IACS, worse than 81% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 98% of copper alloy grades.
Sustainability4
Producing a kilogram of C86300 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 70%.
Manufacturability7
C86300's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability poor (30/100); formability poor (15/100).
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. C86300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C86300
Is C86300 easy to machine?
Tough and gummy-to-abrasive (rating ≈8 vs free-cutting brass): use rigid setups, positive-rake carbide, moderate speed with heavy feed and generous coolant; hard Fe/Al phases accelerate tool wear.
Can C86300 be welded?
Poor to fair — GTAW with matching aluminium-bronze/Mn-bronze filler and preheat is possible for repair, but the alumina film, zinc fumes and cracking sensitivity make production welding inadvisable; do not oxy-fuel weld.
Can C86300 be formed, bent or molded?
Casting alloy only: short freezing range needs chilled, well-fed gating and risering; not cold formable, but hot working near 700–750 °C is feasible for wrought analogues.
Manufacturability
The process limits FabDigit applies to C86300. Every C86300 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Fair25 / 100 |
|---|---|
| ISO material group | N.5 |
| Cutting speed (rough / finish) | 180 / 220 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 6× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
C86300 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 | 60 – 66 | 63 |
| Alprincipal strengthener | 5 – 7.5 | 6 |
| Fegrain refinement / hard phase | 2 – 4 | 3 |
| Mn | 2.5 – 5 | 3.5 |
| Sn | ≤ 0.2 | |
| Pb | ≤ 0.2 | |
| Nimax, incl. Co | ≤ 1 | |
| Simax (typical foundry limit) | ≤ 0.1 | |
| Znremainder after specified elements | ≥ 22 (balance) |
What surface finishes work on C86300?
Grinds and polishes to a bright yellow-gold finish; nickel/chrome plating requires careful alkaline etch due to aluminium, and passivation or paint is advisable in marine service to limit dezincification.
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).
Passivation
Plating
Organic Coating
Equivalent designations
Standards and trade names that resolve to Copper Alloy C86300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- Manganese BronzeHigh Strength Yellow Brass
- Similar grades
- CC762S
How much does C86300 cost?
C86300 is a specialty-cost copper alloy ($$$$$), pricier than about 58% 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.
C86300 — frequently asked
What is C86300 used for?
C86300 is typically used for heavy-duty worm gears and worm wheels, screw-down and lead-screw nuts, bridge and structural bearing plates, hydraulic cylinder components, rolling mill bearings and bushings and manganese bronze gears. In short: massive load-bearing capacity.
What is the yield strength of C86300?
C86300 has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 820 MPa (119 ksi) — stronger than 87% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C86300 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Tough and gummy-to-abrasive (rating ≈8 vs free-cutting brass): use rigid setups, positive-rake carbide, moderate speed with heavy feed and generous coolant; hard Fe/Al phases accelerate tool wear.
Can C86300 be welded?
Not readily — weldability is rated poor (30/100). Poor to fair — GTAW with matching aluminium-bronze/Mn-bronze filler and preheat is possible for repair, but the alumina film, zinc fumes and cracking sensitivity make production welding inadvisable; do not oxy-fuel weld.
What surface finishes work on C86300?
Grinds and polishes to a bright yellow-gold finish; nickel/chrome plating requires careful alkaline etch due to aluminium, and passivation or paint is advisable in marine service to limit dezincification.
Can C86300 be formed, bent or molded?
Casting alloy only: short freezing range needs chilled, well-fed gating and risering; not cold formable, but hot working near 700–750 °C is feasible for wrought analogues.
What is the maximum service temperature of C86300?
C86300 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.
How much does C86300 cost?
C86300 is a specialty-cost copper alloy ($$$$$), pricier than about 58% 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.
Can FabDigit make parts in C86300?
Yes — C86300 is available for CNC machining; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B584 — Standard Specification for Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- CDA Alloy Datasheet C86300 (high-strength manganese bronze) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- GB/T 1176 ZCuZn25Al6Fe3Mn3 (2013)
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.