Copper Alloy C86700-M02
Heat-treated state
UNS C86700
M02 = as centrifugally cast
Choose for bushings, sleeves and worm-gear rims needing a dense, porosity-free wall and slightly higher strength.
Values for the M02 condition
Other C86700 tempers and conditions
C86700 is listed in 4 conditions; see the grade overview at C86700.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M01Default As sand cast | Standard as-cast sand-mould condition for gears, housings and marine hardware per ASTM B584. | 310 | 620 | 18 | 170 HB | 11 % IACS |
As continuous cast | Continuous-cast bar and tube stock for machined bushings and gear blanks — most uniform structure and best machined finish. | 330 | 650 | 18 | 175 HB | 11 % IACS |
M02This page As centrifugally cast | Choose for bushings, sleeves and worm-gear rims needing a dense, porosity-free wall and slightly higher strength. | 340 | 660 | 18 | 180 HB | 11 % IACS |
As pressure die cast | Use for medium-volume small parts where the faster chill gives finer grain, better surface and higher hardness. | 345 | 655 | 16 | 180 HB | 11 % IACS |
What is C86700-M02?
C86700-M02 is C86700 heat treated to M02 — choose for bushings, sleeves and worm-gear rims needing a dense, porosity-free wall and slightly higher strength. C86700-M02 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 71% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 103 GPa (14.9 Msi). C86700-M02 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; M02 is available on request or by drawing note.
Limitations
- Poor heat conductor — 36 W/m·K (20.8 BTU/hr·ft·°F), worse than 86% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
- Difficult to weld — 25/100, worse than 78% of copper alloy grades
C86700-M02 properties
Typical room-temperature values for C86700-M02; 21 are specific to this condition. Other listed values are C86700 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C86700-M02 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).
Mechanical15
C86700-M02 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 71% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C86700-M02 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 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C86700-M02 conducts electricity at 11 % IACS, worse than 68% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (53/100), worse than 92% of copper alloy grades.
Sustainability4
Producing a kilogram of C86700-M02 takes about 45 MJ of energy and emits 3.4 kg of CO₂ — less than 97% of copper alloy grades. Typical recycled content is 75%.
Manufacturability8
C86700-M02's machinability is good (60/100, better than 74% of copper alloy grades); weldability poor (25/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C86700-M02
Is C86700 easy to machine?
Lead addition makes it the easiest of the high-strength manganese bronzes to cut (~60% of free-cutting brass); use sharp positive-rake carbide, high speed, light feed and copious coolant.
Can C86700 be welded?
Fusion welding is not recommended — lead causes hot cracking and zinc fumes; repair by brazing or mechanical fastening and use ventilation for any hot work.
Can C86700 be formed, bent or molded?
Sand, permanent-mould, centrifugal and continuous casting all work well; feed heavily with chills and risers due to the short freezing range and use a low-turbulence gating to avoid oxide films.
What surface finishes work on C86700?
Takes a good mechanical polish and accepts nickel, chrome or tin electroplating; no anodizing — for marine service consider cathodic protection or coatings to limit dezincification.
C86700 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 | 55 – 60 | 58 |
| Sn | ≤ 1.5 | 0.8 |
| Pbadded for machinability | 0.5 – 1.5 | 1 |
| Fe | 1 – 3 | 2 |
| Al | 1 – 3 | 2 |
| Mn | 0.1 – 3.5 | 1 |
| Niincl. Co | ≤ 1 | — |
| Zntypically ~34% | balance | — |
C86700-M02 — frequently asked
What is C86700-M02 used for?
C86700-M02 is typically used for gears, bushings, marine fittings and valve parts. In short: free-machining high-strength bronze; strength with low machining cost.
What is the yield strength of C86700-M02?
C86700-M02 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 71% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C86700-M02 easy to machine?
Reasonably — machinability is rated good (60/100, better than 74% of copper alloy grades). Lead addition makes it the easiest of the high-strength manganese bronzes to cut (~60% of free-cutting brass); use sharp positive-rake carbide, high speed, light feed and copious coolant.
Can C86700-M02 be welded?
Not readily — weldability is rated poor (25/100). Fusion welding is not recommended — lead causes hot cracking and zinc fumes; repair by brazing or mechanical fastening and use ventilation for any hot work.
What surface finishes work on C86700-M02?
Takes a good mechanical polish and accepts nickel, chrome or tin electroplating; no anodizing — for marine service consider cathodic protection or coatings to limit dezincification.
Can C86700-M02 be formed, bent or molded?
Sand, permanent-mould, centrifugal and continuous casting all work well; feed heavily with chills and risers due to the short freezing range and use a low-turbulence gating to avoid oxide films.
What is the maximum service temperature of C86700-M02?
C86700-M02 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 C86700-M01 and C86700-M04?
M01 is the default condition — standard as-cast sand-mould condition for gears, housings and marine hardware per ASTM B584. M04: use for medium-volume small parts where the faster chill gives finer grain, better surface and higher hardness. Yield strength is 310 MPa in M01 versus 345 MPa in M04.
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 C86700 (leaded 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)
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.