Copper Alloy C67000
UNS C67000 · ASTM B138 · EN CW704R
C67000 is a high-strength copper-zinc-manganese-aluminum-iron alloy, commonly called manganese bronze, covered by ASTM B138 and EN CW704R and supplied as extruded rod, forgings and shapes.
Reference datasheet — C67000 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the H02 condition
C67000 tempers and conditions
C67000 is supplied in 6 conditions, soft to hard. H02 is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
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?
C67000 is a high-strength copper-zinc-manganese-aluminum-iron alloy, commonly called manganese bronze, covered by ASTM B138 and EN CW704R and supplied as extruded rod, forgings and shapes. It is chosen for load-bearing marine and drive components that need 655 MPa tensile, 379 MPa yield, 20% elongation and 185 HB with corrosion resistance rated 55. Thermal conductivity is only 42 W/m·K, electrical conductivity 12% IACS, service is capped near 200 °C, and both weldability (30) and machinability (32) are limited by hard Fe/Al particles and zinc fuming. C65100 silicon bronze is the alternative when the joint must be welded. C67000 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). C67000 has a yield strength of 379 MPa (55 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 75% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 103 GPa (14.9 Msi).
What is C67000 used for?
- propeller shafts
- marine hardware
- gears
- structural fittings
Advantages
- Low embodied carbon — 2.8 kg CO₂/kg, better than 100% of copper alloy grades
- High strength — 379 MPa (55 ksi), better than 75% of copper alloy grades
Limitations
- Poor heat conductor — 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 80% of copper alloy grades
C67000 properties
Typical room-temperature values for C67000-H02; bars are the position among copper alloy grades.
Physical3
C67000 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 has a yield strength of 379 MPa (55 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 75% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C67000 is rated for continuous service to 200°C (392 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 80% of copper alloy grades. Thermal expansion is 21.6 µm/m·K (12 µin/in·°F).
Electrical3
C67000 conducts electricity at 12 % IACS, worse than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C67000 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's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability poor (30/100); formability fair (40/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C67000 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C67000
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.
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 |
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.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy C67000 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B138
- EN / DIN / Werkstoff-Nr.
- CW704R
- Similar grades
- HMn58-2-1HMn58-2
How much does C67000 cost?
C67000 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C67000 — frequently asked
What is C67000 used for?
C67000 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?
C67000 has a typical yield strength of 379 MPa (55 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 75% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C67000 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% 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 be welded?
Not readily — weldability is rated poor (30/100). 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?
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 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?
C67000 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 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.
How much does C67000 cost?
C67000 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.