Copper Alloy C86400-M05
Finish state
UNS C86400
M05 = as plaster cast
Use for medium-volume parts needing better surface finish, tighter tolerances and a modest strength gain over sand casting.
Values for the M05 condition
Other C86400 tempers and conditions
C86400 is listed in 5 conditions; see the grade overview at C86400.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M01Default As sand cast | Standard general-purpose condition for valve bodies, housings and one-off or low-volume castings per ASTM B584. | 193 | 448 | 20 | 90 HB | 20 % IACS |
As investment cast | For small, intricate near-net-shape parts where machining allowance must be minimised. | 193 | 448 | 18 | 92 HB | 20 % IACS |
As centrifugally cast | Choose for bushings, sleeves and rings where the denser, finer-grained centrifugal structure gives slightly higher strength and soundness. | 207 | 483 | 20 | 95 HB | 20 % IACS |
M05This page As plaster cast | Use for medium-volume parts needing better surface finish, tighter tolerances and a modest strength gain over sand casting. | 221 | 483 | 18 | 100 HB | 20 % IACS |
As continuous cast | Best choice for machined bar and tube stock: dense, porosity-free structure with the highest as-cast strength and hardness. | 241 | 483 | 15 | 105 HB | 20 % IACS |
What is C86400-M05?
C86400-M05 is C86400 supplied in the M05 condition — use for medium-volume parts needing better surface finish, tighter tolerances and a modest strength gain over sand casting. C86400-M05 has a yield strength of 221 MPa (32.1 ksi) and a tensile strength of 483 MPa (70.1 ksi) — stronger than 50% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 100 GPa (14.5 Msi). C86400-M05 has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 862°C (1,584 °F). M01 is the default condition FabDigit quotes; M05 is available on request or by drawing note.
Advantages
- Low embodied carbon — 2.9 kg CO₂/kg, better than 99% of copper alloy grades
- Easy to machine — 65/100, better than 76% of copper alloy grades
Limitations
- Limited formability — 14/100, worse than 84% of copper alloy grades
- Low stiffness — 100 GPa (14.5 Msi), worse than 82% of copper alloy grades
C86400-M05 properties
Typical room-temperature values for C86400-M05; 20 are specific to this condition. Other listed values are C86400 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C86400-M05 has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 862°C (1,584 °F).
Mechanical14
C86400-M05 has a yield strength of 221 MPa (32.1 ksi) and a tensile strength of 483 MPa (70.1 ksi) — stronger than 50% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
C86400-M05 is rated for continuous service to 200°C (392 °F). It conducts heat at 87 W/m·K (50.3 BTU/hr·ft·°F), better than 53% of copper alloy grades. Thermal expansion is 21.6 µm/m·K (12 µin/in·°F).
Electrical3
C86400-M05 conducts electricity at 20 % IACS, better than 52% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (53/100), worse than 92% of copper alloy grades.
Sustainability4
Producing a kilogram of C86400-M05 takes about 47 MJ of energy and emits 2.9 kg of CO₂ — less than 93% of copper alloy grades. Typical recycled content is 80%.
Manufacturability8
C86400-M05's machinability is good (65/100, better than 76% 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 C86400-M05
Is C86400 easy to machine?
Free-machining thanks to ~1% Pb: rated about 65% of C36000, use sharp positive-rake carbide or HSS tools, high speed and light feed with flood coolant; chips are short and breaking.
Can C86400 be welded?
Poor arc weldability — zinc volatilisation and porosity; oxyacetylene braze welding or silver brazing with flux is preferred, and lead content further degrades fusion welds.
Can C86400 be formed, bent or molded?
A casting alloy only: pours well in sand, permanent mold, investment and centrifugal processes with 1.5–2% shrinkage; needs directional solidification and generous risering because of its short freezing range.
What surface finishes work on C86400?
Polishes to a bright yellow-gold finish; can be nickel/chrome plated or lacquered, but not anodizable — passivate or lacquer to prevent tarnish and avoid ammonia cleaners (SCC risk).
C86400 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 | 56 – 62 | 59 |
| Sn | 0.5 – 1.5 | 1 |
| Pbadded for machinability; not for potable-water service | 0.5 – 1.5 | 1 |
| Fe | 0.4 – 2 | 1 |
| Al | 0.5 – 1.5 | 1 |
| Mn | 0.1 – 1.5 | 0.5 |
| Niincluding Co | ≤ 1 | — |
| Zn | ≥ 34 (balance) | — |
C86400-M05 — frequently asked
What is C86400-M05 used for?
C86400-M05 is typically used for gears, bushings, valve components and machine parts. In short: free-machining manganese bronze; moderate strength, low machining cost.
What is the yield strength of C86400-M05?
C86400-M05 has a typical yield strength of 221 MPa (32.1 ksi) and a tensile strength of 483 MPa (70.1 ksi) — stronger than 50% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C86400-M05 easy to machine?
Reasonably — machinability is rated good (65/100, better than 76% of copper alloy grades). Free-machining thanks to ~1% Pb: rated about 65% of C36000, use sharp positive-rake carbide or HSS tools, high speed and light feed with flood coolant; chips are short and breaking.
Can C86400-M05 be welded?
Not readily — weldability is rated poor (30/100). Poor arc weldability — zinc volatilisation and porosity; oxyacetylene braze welding or silver brazing with flux is preferred, and lead content further degrades fusion welds.
What surface finishes work on C86400-M05?
Polishes to a bright yellow-gold finish; can be nickel/chrome plated or lacquered, but not anodizable — passivate or lacquer to prevent tarnish and avoid ammonia cleaners (SCC risk).
Can C86400-M05 be formed, bent or molded?
A casting alloy only: pours well in sand, permanent mold, investment and centrifugal processes with 1.5–2% shrinkage; needs directional solidification and generous risering because of its short freezing range.
What is the maximum service temperature of C86400-M05?
C86400-M05 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 C86400-M01 and C86400-M07?
M01 is the default condition — standard general-purpose condition for valve bodies, housings and one-off or low-volume castings per ASTM B584. M07: best choice for machined bar and tube stock: dense, porosity-free structure with the highest as-cast strength and hardness. Yield strength is 193 MPa in M01 versus 241 MPa in M07.
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)
- ASTM B271 Copper-Base Alloy Centrifugal Castings — ASTM International (2019)
- CDA Alloy Datasheet C86400 (Leaded Manganese Bronze) — Copper Development Association (2023)
- 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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.