Copper Alloy C67000-M30
Temper
UNS C67000 · ASTM B138 · EN CW704R
M30 = as hot extruded
Standard mill condition for large-diameter bar, shapes and forging stock where no cold draw is applied.
Values for the M30 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 |
|---|---|---|---|---|---|---|
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 |
M30This page 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-M30?
C67000-M30 is C67000 in the M30 temper — standard mill condition for large-diameter bar, shapes and forging stock where no cold draw is applied. C67000-M30 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 69% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 103 GPa (14.9 Msi). C67000-M30 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; M30 is available on request or by drawing note.
Advantages
- Low embodied carbon — 2.8 kg CO₂/kg, better than 100% 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-M30 properties
Typical room-temperature values for C67000-M30; 10 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-M30 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-M30 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 69% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C67000-M30 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-M30 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-M30 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-M30's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability poor (30/100); formability fair (48/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C67000-M30
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-M30 — frequently asked
What is C67000-M30 used for?
C67000-M30 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-M30?
C67000-M30 has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 69% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C67000-M30 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% 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-M30 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-M30?
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-M30 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-M30?
C67000-M30 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.
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.