Copper Alloy C86300 M02 Permanent Mold
Heat-treated state
UNS C86300
Use for repeat production of smaller parts where chilled, fine-grained structure raises strength and hardness slightly.
Values for the M02 Permanent Mold condition
Other C86300 tempers and conditions
C86300 is listed in 4 conditions; see the grade overview at C86300.
- M07 Continuous Cast
- As Cast
- M04 Centrifugal Cast
- M02 Permanent Mold
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 Permanent MoldThis page 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 M02 Permanent Mold?
C86300 M02 Permanent Mold is C86300 heat treated to M02 Permanent Mold — use for repeat production of smaller parts where chilled, fine-grained structure raises strength and hardness slightly. C86300 M02 Permanent Mold has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 840 MPa (122 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 103 GPa (14.9 Msi). C86300 M02 Permanent Mold 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). As Cast is the default condition FabDigit quotes; M02 Permanent Mold is available on request or by drawing note.
Advantages
- Lightweight — 7.65 g/cm³ (0.276 lb/in³), better than 91% of copper alloy grades
- High strength — 480 MPa (69.6 ksi), better than 88% 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
- Difficult to machine — 24/100, worse than 91% of copper alloy grades
- Poor heat conductor — 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades
- Limited formability — 14/100, worse than 84% of copper alloy grades
C86300 M02 Permanent Mold properties
Typical room-temperature values for C86300 M02 Permanent Mold; 22 are specific to this condition. Other listed values are C86300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C86300 M02 Permanent Mold 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 M02 Permanent Mold has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 840 MPa (122 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C86300 M02 Permanent Mold 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 M02 Permanent Mold 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 M02 Permanent Mold 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 M02 Permanent Mold's machinability is poor (24/100, worse than 91% of copper alloy grades); weldability poor (30/100); formability not recommended (14/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C86300 M02 Permanent Mold
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 M02 Permanent Mold — frequently asked
What is C86300 M02 Permanent Mold used for?
C86300 M02 Permanent Mold 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 M02 Permanent Mold?
C86300 M02 Permanent Mold has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 840 MPa (122 ksi) — stronger than 88% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C86300 M02 Permanent Mold easy to machine?
Not especially — machinability is rated poor (24/100, worse than 91% 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 M02 Permanent Mold 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 M02 Permanent Mold?
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 M02 Permanent Mold 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 M02 Permanent Mold?
C86300 M02 Permanent Mold 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 M02 Permanent Mold?
Yes — C86300 M02 Permanent Mold 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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.