Copper Alloy C67500-M30
Temper
UNS C67500 · ASTM B138 · EN CW721R
M30 = as hot extruded
Mill-standard condition for large-diameter rod, hollow bar and profiles supplied straight from the extrusion press.
Values for the M30 condition
Other C67500 tempers and conditions
C67500 is listed in 6 conditions; see the grade overview at C67500.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for maximum ductility when parts must be bent, upset or further cold worked before final machining. | 207 | 448 | 33 | 130 HB | 24 % IACS |
As hot forged and air cooled | Standard condition for hot-forged propeller hubs, blade flanges and valve bodies where uniform mid-range properties are wanted. | 207 | 483 | 30 | 140 HB | 24 % IACS |
M30This page As hot extruded | Mill-standard condition for large-diameter rod, hollow bar and profiles supplied straight from the extrusion press. | 240 | 490 | 25 | 145 HB | 24 % IACS |
As forged and quenched | Water-quenched from forging heat to retain more β phase — higher strength and finer structure than air-cooled forgings. | 241 | 517 | 26 | 152 HB | 23 % IACS |
H02Default Half hard | The standard stocked condition for machined shafts, valve stems and fasteners — best balance of strength, straightness and remaining ductility. | 310 | 517 | 20 | 160 HB | 24 % IACS |
Full hard | Pick when maximum strength, wear resistance and thread/bearing hardness are needed and bending is not required. | 414 | 579 | 15 | 180 HB | 23 % IACS |
What is C67500-M30?
C67500-M30 is C67500 in the M30 temper — mill-standard condition for large-diameter rod, hollow bar and profiles supplied straight from the extrusion press. C67500-M30 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 490 MPa (71.1 ksi) — stronger than 52% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 103 GPa (14.9 Msi). C67500-M30 has a density of 8.36 g/cm³ (0.302 lb/in³), lighter than 76% of copper alloy grades. It melts at 865°C (1,589 °F). H02 is the default condition FabDigit quotes; M30 is available on request or by drawing note.
C67500-M30 properties
Typical room-temperature values for C67500-M30; 13 are specific to this condition. Other listed values are C67500 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C67500-M30 has a density of 8.36 g/cm³ (0.302 lb/in³), lighter than 76% of copper alloy grades. It melts at 865°C (1,589 °F).
Mechanical14
C67500-M30 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 490 MPa (71.1 ksi) — stronger than 52% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C67500-M30 is rated for continuous service to 200°C (392 °F). It conducts heat at 100 W/m·K (57.8 BTU/hr·ft·°F), better than 54% of copper alloy grades. Thermal expansion is 21.2 µm/m·K (11.8 µin/in·°F).
Electrical3
C67500-M30 conducts electricity at 24 % IACS, better than 57% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C67500-M30 takes about 50 MJ of energy and emits 3.4 kg of CO₂ — less than 89% of copper alloy grades. Typical recycled content is 55%.
Manufacturability8
C67500-M30's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability good (55/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C67500-M30
Is C67500 easy to machine?
Machinability ~30 % of free-cutting brass — use sharp positive-rake carbide, moderate speeds and generous coolant; chips are tough and stringy because of the low lead content.
Can C67500 be welded?
Weldable by GTAW/GMAW with silicon-bronze or manganese-bronze filler; preheat heavy sections, keep heat input low to limit zinc fume and dezincification of the HAZ.
Can C67500 be formed, bent or molded?
Excellent hot workability at 650–760 °C (forge, extrude, hot bend); cold formability is only fair — anneal at ~600 °C before severe cold bends.
What surface finishes work on C67500?
Not anodizable; takes bright polishing, nickel/chrome plating and tin plating well, and marine parts are usually left bare or coated with anti-fouling/epoxy systems.
C67500 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 |
|---|---|---|
| Cumay include Ag | 57 – 60 | 58.5 |
| Sn | 0.5 – 1.5 | 1 |
| Feforms Fe-rich dispersoids, grain refiner | 0.8 – 2 | 1.2 |
| Mn | 0.05 – 0.5 | 0.25 |
| Al | ≤ 0.25 | 0.15 |
| Pbimpurity limit | ≤ 0.2 | — |
| Znbalance, nominally ~38–39 % | balance | — |
C67500-M30 — frequently asked
What is C67500-M30 used for?
C67500-M30 is typically used for ship propellers, valve stems, marine hardware and gears. In short: classic propeller bronze; high-strength marine bronze; forges well hot.
What is the yield strength of C67500-M30?
C67500-M30 has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 490 MPa (71.1 ksi) — stronger than 52% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C67500-M30 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Machinability ~30 % of free-cutting brass — use sharp positive-rake carbide, moderate speeds and generous coolant; chips are tough and stringy because of the low lead content.
Can C67500-M30 be welded?
Yes — weldability is rated good (55/100). Weldable by GTAW/GMAW with silicon-bronze or manganese-bronze filler; preheat heavy sections, keep heat input low to limit zinc fume and dezincification of the HAZ.
What surface finishes work on C67500-M30?
Not anodizable; takes bright polishing, nickel/chrome plating and tin plating well, and marine parts are usually left bare or coated with anti-fouling/epoxy systems.
Can C67500-M30 be formed, bent or molded?
Excellent hot workability at 650–760 °C (forge, extrude, hot bend); cold formability is only fair — anneal at ~600 °C before severe cold bends.
What is the maximum service temperature of C67500-M30?
C67500-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 C67500-H02 and C67500-H04?
H02 is the default condition — the standard stocked condition for machined shafts, valve stems and fasteners — best balance of strength, straightness and remaining ductility. H04: pick when maximum strength, wear resistance and thread/bearing hardness are needed and bending is not required. Yield strength is 310 MPa in H02 versus 414 MPa in H04.
Sources
- ASTM B138/B138M — Manganese Bronze Rod, Bar and Shapes — ASTM International (2019)
- CDA Alloy C67500 property datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- EN 12163 / CW721R (CuZn40Mn1Fe1) wrought copper alloy rod — 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.