Copper Alloy C96400-M07
Heat-treated state
UNS C96400 · EN CC381H, CuNi30Fe1Mn1-C
M07 = as continuous cast
Continuous-cast bar and tube stock for machined seawater fittings and shafts; sound, low-porosity sections.
Values for the M07 condition
Other C96400 tempers and conditions
C96400 is listed in 5 conditions; see the grade overview at C96400.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress relieved | Optional post-weld or post-machining treatment to relieve residual stress and homogenise heavy sections; strength drops slightly, ductility rises. | 250 | 470 | 28 | 132 HB | 4.7 % IACS |
M01Default As sand cast | Standard stocked/ordered condition for valve bodies, pump casings and marine fittings per ASTM B369. | 265 | 480 | 25 | 140 HB | 4.5 % IACS |
As investment cast | For small, near-net-shape marine hardware, impellers and valve trim needing fine detail and low machining allowance. | 270 | 490 | 24 | 142 HB | 4.5 % IACS |
M07This page As continuous cast | Continuous-cast bar and tube stock for machined seawater fittings and shafts; sound, low-porosity sections. | 270 | 495 | 25 | 143 HB | 4.5 % IACS |
As centrifugally cast | Choose for seamless rings, sleeves, seawater pipe spools and bearing/pump liners where a denser, finer-grained wall is wanted. | 275 | 505 | 26 | 145 HB | 4.5 % IACS |
What is C96400-M07?
C96400-M07 is C96400 heat treated to M07 — continuous-cast bar and tube stock for machined seawater fittings and shafts; sound, low-porosity sections. C96400-M07 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 495 MPa (71.8 ksi) — stronger than 56% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 152 GPa (22 Msi). C96400-M07 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,171°C (2,140 °F). M01 is the default condition FabDigit quotes; M07 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 85/100, better than 100% of copper alloy grades
- Stiff — 152 GPa (22 Msi), better than 99% of copper alloy grades
- Readily welded — 80/100, better than 93% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
Limitations
- Low electrical conductivity — 4.5 % IACS, worse than 98% of copper alloy grades
- Poor heat conductor — 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 96% of copper alloy grades
- High embodied carbon — 5.5 kg CO₂/kg, worse than 89% of copper alloy grades
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
C96400-M07 properties
Typical room-temperature values for C96400-M07; 20 are specific to this condition. Other listed values are C96400 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C96400-M07 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,171°C (2,140 °F).
Mechanical14
C96400-M07 has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 495 MPa (71.8 ksi) — stronger than 56% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 152 GPa (22 Msi).
Thermal6
C96400-M07 is rated for continuous service to 300°C (572 °F). It conducts heat at 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 96% of copper alloy grades. Thermal expansion is 16 µm/m·K (8.89 µin/in·°F).
Electrical3
C96400-M07 conducts electricity at 4.5 % IACS, worse than 98% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 100% of copper alloy grades.
Sustainability4
Producing a kilogram of C96400-M07 takes about 78 MJ of energy and emits 5.5 kg of CO₂ — more than 90% of copper alloy grades. Typical recycled content is 35%.
Manufacturability7
C96400-M07's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability very good (80/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C96400-M07
Is C96400 easy to machine?
Gummy and work-hardening — use sharp, positive-rake carbide, heavy feeds, rigid setups, low-to-moderate speeds and flood coolant; never dwell or rub.
Can C96400 be welded?
Very good with GTAW/GMAW/SMAW using 70-30 CuNi (ERCuNi / ENiCu) filler; keep interpass temperature low, clean all oil and sulphur, no preheat needed.
Can C96400 be formed, bent or molded?
Supplied as castings — sand, centrifugal, investment and continuous casting all practical; wide freezing range demands directional solidification, generous risers and chills.
What surface finishes work on C96400?
Takes a bright polish and passivates naturally in seawater to a protective adherent film; no anodizing — pickle/passivate after welding and avoid iron contamination of the surface.
C96400 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 |
|---|---|---|
| NiNi + Co | 28 – 32 | 30 |
| Fe | 0.25 – 1.5 | 0.9 |
| Mn | 0.5 – 1.5 | 1 |
| Nbcolumbium — deoxidiser/weldability | 0.5 – 1.5 | 0.8 |
| Si | ≤ 0.5 | — |
| C | ≤ 0.15 | — |
| Pb | ≤ 0.03 | — |
| P | ≤ 0.02 | — |
| S | ≤ 0.02 | — |
| Curemainder, including Co counted with Ni per ASTM B369 | balance | — |
C96400-M07 — frequently asked
What is C96400-M07 used for?
C96400-M07 is typically used for marine propellers, heavy-duty pump castings, condenser water boxes and offshore piping components. In short: standard 70-30 cast Cu-Ni; best seawater erosion resistance; highly weldable marine casting.
What is the yield strength of C96400-M07?
C96400-M07 has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 495 MPa (71.8 ksi) — stronger than 56% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C96400-M07 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Gummy and work-hardening — use sharp, positive-rake carbide, heavy feeds, rigid setups, low-to-moderate speeds and flood coolant; never dwell or rub.
Can C96400-M07 be welded?
Yes — weldability is rated very good (80/100). Very good with GTAW/GMAW/SMAW using 70-30 CuNi (ERCuNi / ENiCu) filler; keep interpass temperature low, clean all oil and sulphur, no preheat needed.
What surface finishes work on C96400-M07?
Takes a bright polish and passivates naturally in seawater to a protective adherent film; no anodizing — pickle/passivate after welding and avoid iron contamination of the surface.
Can C96400-M07 be formed, bent or molded?
Supplied as castings — sand, centrifugal, investment and continuous casting all practical; wide freezing range demands directional solidification, generous risers and chills.
What is the maximum service temperature of C96400-M07?
C96400-M07 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C96400-M01 and C96400-SR?
M01 is the default condition — standard stocked/ordered condition for valve bodies, pump casings and marine fittings per ASTM B369. SR: optional post-weld or post-machining treatment to relieve residual stress and homogenise heavy sections; strength drops slightly, ductility rises. Yield strength is 265 MPa in M01 versus 250 MPa in SR.
Sources
- ASTM B369 — Copper-Nickel Alloy Castings — ASTM International (2021)
- EN 1982 — Copper and copper alloys: ingots and castings (CC381H) — CEN (2017)
- CDA Alloy Datasheet C96400 — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Copper-Nickel Alloys: Properties and Applications — Nickel Institute / CDA UK (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.