Copper Alloy C96400
UNS C96400 · EN CC381H, CuNi30Fe1Mn1-C
C96400 (CC381H, CuNi30Fe1Mn1-C) is the high-nickel 70-30 cast copper-nickel, giving higher strength and better seawater erosion resistance than the 90-10 cast grade.
Reference datasheet — C96400 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 M01 condition
C96400 tempers and conditions
C96400 is supplied in 5 conditions, soft to hard. M01 is the default FabDigit quotes; the values on this page are for it.
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 |
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?
C96400 (CC381H, CuNi30Fe1Mn1-C) is the high-nickel 70-30 cast copper-nickel, giving higher strength and better seawater erosion resistance than the 90-10 cast grade. Default properties are 265 MPa yield, 470–480 MPa class tensile at 480 MPa, 25% elongation and 140 HB, with service to 300 °C and 4.5% IACS electrical conductivity; it is produced by sand, centrifugal, investment and continuous casting. Conductivity is low and the alloy machines gummy, so cycle times and tooling cost run above leaded bronzes. For higher strength in the same family, consider C96900 or the age-hardening C96600. C96400 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). C96400 has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 55% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 152 GPa (22 Msi).
What is C96400 used for?
- marine propellers
- heavy-duty pump castings
- condenser water boxes
- offshore piping components
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 properties
Typical room-temperature values for C96400-M01; bars are the position among copper alloy grades.
Physical3
C96400 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 has a yield strength of 265 MPa (38.4 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 55% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 152 GPa (22 Msi).
Thermal6
C96400 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 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 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's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability very good (80/100); formability poor (20/100).
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. C96400 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C96400
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.
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 |
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.
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 C96400 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CC381HCuNi30Fe1Mn1-C
How much does C96400 cost?
C96400 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.
C96400 — frequently asked
What is C96400 used for?
C96400 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?
C96400 has a typical yield strength of 265 MPa (38.4 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 55% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C96400 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 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?
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 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?
C96400 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.
How much does C96400 cost?
C96400 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 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; 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.