Copper Alloy C67400-O60
Temper
UNS C67400 · ASTM B138
O60 = soft annealed
Choose when maximum ductility for bending, upsetting or secondary forming is needed.
Values for the O60 condition
Other C67400 tempers and conditions
C67400 is listed in 6 conditions; see the grade overview at C67400.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
O60This page Soft annealed | Choose when maximum ductility for bending, upsetting or secondary forming is needed. | 260 | 585 | 30 | 150 HB | — |
As hot rolled | Hot-rolled plate, flats and heavy shapes where section size prevents extrusion or drawing. | 305 | 620 | 24 | 170 HB | 8 % IACS |
M30Default As hot extruded | Standard stock condition for rod, bar and shapes; best balance of strength, ductility and price. | 331 | 655 | 20 | 185 HB | 8 % IACS |
Quarter hard | Light cold draw for improved straightness, surface finish and moderate strength gain. | 380 | 655 | 20 | 175 HB | 8 % IACS |
Half hard | Cold-drawn rod for shafts, stems and wear parts needing higher yield strength and hardness. | 450 | 725 | 15 | 200 HB | — |
Half hard and stress relieved | Pick for precision machined marine/structural parts where residual-stress distortion and SCC risk must be minimised at high strength. | 470 | 745 | 14 | 205 HB | — |
What is C67400-O60?
C67400-O60 is C67400 in the O60 temper — choose when maximum ductility for bending, upsetting or secondary forming is needed. C67400-O60 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 55% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 105 GPa (15.2 Msi). C67400-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). M30 is the default condition FabDigit quotes; O60 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 30%, better than 75% of copper alloy grades
Limitations
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
- Poor heat conductor — 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 82% of copper alloy grades
- Low electrical conductivity — 8 % IACS, worse than 81% of copper alloy grades
C67400-O60 properties
Typical room-temperature values for C67400-O60; 10 are specific to this condition. Other listed values are C67400 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C67400-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
C67400-O60 has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 55% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
C67400-O60 is rated for continuous service to 200°C (392 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 82% of copper alloy grades. Thermal expansion is 21 µm/m·K (11.7 µin/in·°F).
Electrical3
C67400-O60 conducts electricity at 8 % IACS, worse than 81% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C67400-O60 takes about 55 MJ of energy and emits 3.5 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C67400-O60's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability fair (35/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C67400-O60
Is C67400 easy to machine?
Machinable but only ~25 % of free-cutting brass: use rigid setups, sharp carbide, positive rake, moderate speeds and generous coolant; chips are tough and stringy, not free-breaking.
Can C67400 be welded?
Arc welding (GTAW/GMAW with Si-bronze or Al-bronze filler) is only fair — zinc fumes, porosity and HAZ softening; oxyfuel welding is not recommended, soldering is good and brazing fair.
Can C67400 be formed, bent or molded?
Excellent hot workability (extrusion/forging ~650–760 °C); cold formability is limited by the β phase, so keep bends generous and interanneal, then stress-relieve to avoid SCC.
What surface finishes work on C67400?
Takes a good mechanical polish and buffs to a bright gold tone; chrome, nickel or tin plating is straightforward — no anodizing; use conversion/lacquer or patination for outdoor colour stability.
C67400 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 | 57 – 60 | 58.5 |
| Mnprimary strengthener | 2 – 3.5 | 2.7 |
| Si | 0.5 – 1.5 | 1 |
| Alraises strength and wear resistance | 0.5 – 2 | 1.2 |
| Fe | ≤ 0.35 | — |
| Sn | ≤ 0.3 | — |
| Pb | ≤ 0.5 | — |
| Znremainder, nominally ~36 % | balance | — |
C67400-O60 — frequently asked
What is C67400-O60 used for?
C67400-O60 is typically used for marine shafting, propeller components, gears and structural hardware. In short: high-strength manganese brass; marine shafting grade; low machinability rating 28.
What is the yield strength of C67400-O60?
C67400-O60 has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 55% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C67400-O60 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Machinable but only ~25 % of free-cutting brass: use rigid setups, sharp carbide, positive rake, moderate speeds and generous coolant; chips are tough and stringy, not free-breaking.
Can C67400-O60 be welded?
With care — weldability is rated fair (35/100). Arc welding (GTAW/GMAW with Si-bronze or Al-bronze filler) is only fair — zinc fumes, porosity and HAZ softening; oxyfuel welding is not recommended, soldering is good and brazing fair.
What surface finishes work on C67400-O60?
Takes a good mechanical polish and buffs to a bright gold tone; chrome, nickel or tin plating is straightforward — no anodizing; use conversion/lacquer or patination for outdoor colour stability.
Can C67400-O60 be formed, bent or molded?
Excellent hot workability (extrusion/forging ~650–760 °C); cold formability is limited by the β phase, so keep bends generous and interanneal, then stress-relieve to avoid SCC.
What is the maximum service temperature of C67400-O60?
C67400-O60 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 C67400-M30 and C67400-HR02?
M30 is the default condition — standard stock condition for rod, bar and shapes; best balance of strength, ductility and price. HR02: pick for precision machined marine/structural parts where residual-stress distortion and SCC risk must be minimised at high strength. Yield strength is 331 MPa in M30 versus 470 MPa in HR02.
Sources
- ASTM B138/B138M — Manganese Bronze Rod, Bar and Shapes — ASTM International (2019)
- Copper Alloy C67400 alloy data (UNS C67400) — 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.