Copper Alloy C67000-O60
Temper
UNS C67000 · ASTM B138 · EN CW704R
O60 = soft annealed
Pick for maximum ductility when parts must be cold formed, bent or upset before final machining.
Values for the O60 condition
Other C67000 tempers and conditions
C67000 is listed in 6 conditions; see the grade overview at C67000.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
O60This page Soft annealed | Pick for maximum ductility when parts must be cold formed, bent or upset before final machining. | 290 | 565 | 32 | 140 HB | 13 % IACS |
As hot rolled | Condition of net-shape hot forgings such as marine propeller hubs, gear blanks and heavy nuts. | 310 | 600 | 26 | 160 HB | 12 % IACS |
As hot extruded | Standard mill condition for large-diameter bar, shapes and forging stock where no cold draw is applied. | 330 | 620 | 25 | 165 HB | — |
Quarter hard | Compromise temper for straight, close-tolerance bar that still needs moderate bending or riveting. | 345 | 620 | 25 | 170 HB | 12 % IACS |
H02Default Half hard | Default stocked rod/bar temper: best balance of ~655 MPa strength, 20 % elongation and machinable structure. | 379 | 655 | 20 | 185 HB | 12 % IACS |
Full hard | Choose for maximum strength and wear resistance in shafts, valve stems and heavy-duty bushings with little forming. | 480 | 740 | 12 | 210 HB | 12 % IACS |
What is C67000-O60?
C67000-O60 is C67000 in the O60 temper — pick for maximum ductility when parts must be cold formed, bent or upset before final machining. C67000-O60 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 565 MPa (81.9 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 32% and the elastic modulus is 103 GPa (14.9 Msi). C67000-O60 has a density of 8.36 g/cm³ (0.302 lb/in³), lighter than 76% of copper alloy grades. It melts at 862°C (1,584 °F). H02 is the default condition FabDigit quotes; O60 is available on request or by drawing note.
Advantages
- Low embodied carbon — 2.8 kg CO₂/kg, better than 100% of copper alloy grades
- Ductile — tolerates forming and impact — 32%, better than 77% of copper alloy grades
Limitations
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
- Poor heat conductor — 43 W/m·K (24.8 BTU/hr·ft·°F), worse than 78% of copper alloy grades
C67000-O60 properties
Typical room-temperature values for C67000-O60; 17 are specific to this condition. Other listed values are C67000 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C67000-O60 has a density of 8.36 g/cm³ (0.302 lb/in³), lighter than 76% of copper alloy grades. It melts at 862°C (1,584 °F).
Mechanical13
C67000-O60 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 565 MPa (81.9 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 32% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C67000-O60 is rated for continuous service to 250°C (482 °F). It conducts heat at 43 W/m·K (24.8 BTU/hr·ft·°F), worse than 78% of copper alloy grades. Thermal expansion is 21.6 µm/m·K (12 µin/in·°F).
Electrical3
C67000-O60 conducts electricity at 13 % IACS, worse than 58% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C67000-O60 takes about 42 MJ of energy and emits 2.8 kg of CO₂ — less than 99% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C67000-O60's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability poor (32/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C67000-O60
Is C67000 easy to machine?
Machines like a tough alpha-beta brass at roughly 30 % of free-cutting brass — use rigid setups, carbide tooling, positive rake, moderate speeds and generous coolant; hard Fe/Al particles abrade edges.
Can C67000 be welded?
Poor to fair: GTAW/GMAW with aluminium-bronze filler and DCEN cleaning is possible but zinc fuming, aluminium oxide and hot-short HAZ cracking make brazing/soldering unreliable; mechanical joining is preferred.
Can C67000 be formed, bent or molded?
Excellent hot workability at 650–760 °C (extrusion, forging); cold formability only fair — limit cold bends in H04 and interanneal at ~550–600 °C for severe forming.
What surface finishes work on C67000?
Not anodizable; takes a bright mechanical polish and accepts nickel/chrome or tin plating after thorough oxide removal — passivate with benzotriazole or lacquer for marine service and avoid ammonia-containing cleaners.
C67000 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 |
|---|---|---|
| CuASTM B138 alloy C67000 (manganese bronze B) | 63 – 68 | 65 |
| Alprimary strengthener; raises oxide-film problems in welding | 3 – 6 | 4.5 |
| Mn | 2 – 4 | 3 |
| Fegrain refiner, forms Fe-rich particles | 2 – 4 | 3 |
| Sn | ≤ 0.5 | — |
| Ni | ≤ 0.25 | — |
| Si | ≤ 0.1 | — |
| Pb | ≤ 0.2 | — |
| Znremainder, nominally ~24–26 % | balance | — |
C67000-O60 — frequently asked
What is C67000-O60 used for?
C67000-O60 is typically used for propeller shafts, marine hardware, gears and structural fittings. In short: high-tensile manganese bronze; strongest wrought brass-type alloy; excellent hot forgeability.
What is the yield strength of C67000-O60?
C67000-O60 has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 565 MPa (81.9 ksi) — stronger than 60% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C67000-O60 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Machines like a tough alpha-beta brass at roughly 30 % of free-cutting brass — use rigid setups, carbide tooling, positive rake, moderate speeds and generous coolant; hard Fe/Al particles abrade edges.
Can C67000-O60 be welded?
Not readily — weldability is rated poor (32/100). Poor to fair: GTAW/GMAW with aluminium-bronze filler and DCEN cleaning is possible but zinc fuming, aluminium oxide and hot-short HAZ cracking make brazing/soldering unreliable; mechanical joining is preferred.
What surface finishes work on C67000-O60?
Not anodizable; takes a bright mechanical polish and accepts nickel/chrome or tin plating after thorough oxide removal — passivate with benzotriazole or lacquer for marine service and avoid ammonia-containing cleaners.
Can C67000-O60 be formed, bent or molded?
Excellent hot workability at 650–760 °C (extrusion, forging); cold formability only fair — limit cold bends in H04 and interanneal at ~550–600 °C for severe forming.
What is the maximum service temperature of C67000-O60?
C67000-O60 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C67000-H02 and C67000-H04?
H02 is the default condition — default stocked rod/bar temper: best balance of ~655 MPa strength, 20 % elongation and machinable structure. H04: choose for maximum strength and wear resistance in shafts, valve stems and heavy-duty bushings with little forming. Yield strength is 379 MPa in H02 versus 480 MPa in H04.
Sources
- ASTM B138/B138M — Manganese Bronze Rod, Bar and Shapes — ASTM International (2019)
- CDA Alloy Database — C67000 (Manganese Bronze B) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- EN 12163/12164 — Copper and copper alloys, rod and bar (CW704R CuZn40Mn2Fe1) — CEN (2016)
- GB/T 4423 / GB/T 13808 — / (HMn58-2) — SAC (2020)
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.