Copper Alloy C86300 · finish state · default condition
Copper Alloy C86300 As Cast
Properties of the As Cast condition, compared with the other C86300 tempers.
Standard stocked condition for gears, nuts and bearing plates; highest availability, properties per ASTM B584.
What is C86300 As Cast?
C86300 As Cast is C86300 supplied in the As Cast condition — standard stocked condition for gears, nuts and bearing plates; highest availability, properties per ASTM B584. C86300 As Cast 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). C86300 As Cast 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).
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 85% of copper alloy grades
- Limited formability — 15/100, worse than 82% of copper alloy grades
C86300 As Cast properties
Typical room-temperature values for C86300 As Cast — 11 properties are specific to this condition; the rest are grade-level values shared by every C86300 temper. Each bar shows where the value sits among the copper alloy grades in FabDigit's library — further right is higher.
Physical3
C86300 As Cast 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 As Cast 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 As Cast 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 As Cast 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 As Cast 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 As Cast's machinability is poor (25/100, worse than 85% 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.
Other C86300 tempers and conditions
C86300 is also supplied in 3 other conditions. The full side-by-side table is on the C86300 overview.
- As CastDefaultStandard stocked condition for gears, nuts and bearing plates; highest availability, properties per ASTM B584.470 MPa yield · 225 HB
Working with C86300 As Cast
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.
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.
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) | — |
C86300 As Cast — frequently asked
What is C86300 As Cast used for?
C86300 As Cast 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 As Cast?
C86300 As Cast 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 As Cast easy to machine?
Not especially — machinability is rated poor (25/100, worse than 85% 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 As Cast 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 As Cast?
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 As Cast 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 As Cast?
C86300 As Cast 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.
Can FabDigit make parts in C86300 As Cast?
Yes — C86300 As Cast is available for CNC machining with instant online pricing. 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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.