Copper Alloy CC381H
EN CC381H · UNS C96400
CC381H is the cast 70-30 copper-nickel (CuNi30Fe1Mn1-C, equivalent to C96400), supplied as sand, die, centrifugal and continuous castings.
Reference datasheet — CC381H 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 GS condition
CC381H tempers and conditions
CC381H is supplied in 4 conditions, soft to hard. GS is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
GSDefault Sand cast | Standard supply condition for pump casings, valve bodies and large marine housings. | 255 | 470 | 25 | 140 HB | 4.6 % IACS |
Gravity (permanent mould) die cast | Choose for medium-run small parts needing finer grain and better surface than sand casting. | 265 | 485 | 22 | 145 HB | 4.6 % IACS |
Continuously cast | Bar/tube stock condition for machined fittings and valve components; uniform, low-porosity structure. | 270 | 490 | 20 | 148 HB | 4.6 % IACS |
Centrifugally cast | Best choice for seawater pipe, sleeves, wear rings and bushings — densest, most sound structure. | 275 | 500 | 20 | 150 HB | 4.6 % IACS |
What is CC381H?
CC381H is the cast 70-30 copper-nickel (CuNi30Fe1Mn1-C, equivalent to C96400), supplied as sand, die, centrifugal and continuous castings. It gives higher strength and better seawater erosion-corrosion resistance than the 90-10 grade — 255 MPa yield, 470 MPa tensile, 25 % elongation, 140 HB / 76 HRB — and is used for marine pump housings and propeller components. Limits are a 300 °C service ceiling, 4.6 % IACS conductivity, a machinability score of 25, and the higher nickel cost; CC380H covers lower-duty seawater parts, and CC383H adds niobium for higher strength. CC381H has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,170°C (2,138 °F). CC381H has a yield strength of 255 MPa (37 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 55% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 150 GPa (21.8 Msi).
What is CC381H used for?
- marine pump housings
- propeller hubs
- condenser end covers
- seawater piping fittings
Advantages
- Stiff — 150 GPa (21.8 Msi), better than 98% of copper alloy grades
- Good corrosion resistance — 80/100, better than 96% of copper alloy grades
- Readily welded — 75/100, better than 89% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
Limitations
- Poor heat conductor — 28 W/m·K (16.2 BTU/hr·ft·°F), worse than 96% of copper alloy grades
- Low electrical conductivity — 4.6 % IACS, worse than 96% of copper alloy grades
- High embodied carbon — 6 kg CO₂/kg, worse than 92% of copper alloy grades
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
CC381H properties
Typical room-temperature values for CC381H-GS; bars are the position among copper alloy grades.
Physical3
CC381H has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,170°C (2,138 °F).
Mechanical13
CC381H has a yield strength of 255 MPa (37 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 55% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 150 GPa (21.8 Msi).
Thermal6
CC381H 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 15.3 µm/m·K (8.5 µin/in·°F).
Electrical3
CC381H conducts electricity at 4.6 % IACS, worse than 96% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 96% of copper alloy grades.
Sustainability4
Producing a kilogram of CC381H takes about 75 MJ of energy and emits 6 kg of CO₂ — more than 88% of copper alloy grades. Typical recycled content is 40%.
Manufacturability6
CC381H's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability very good (75/100).
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. CC381H is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CC381H
Is CC381H easy to machine?
Gummy and work-hardening like all Cu-Ni: use sharp positive-rake carbide, low speed (~30–60 m/min) with heavy positive feed, rigid setup and abundant coolant; avoid dwelling to prevent glazing.
Can CC381H be welded?
Good weldability with GTAW/GMAW using 70/30 Cu-Ni (ERCuNi) or Ni-Cu filler; keep interpass temperature low, no preheat needed, and remove all oxide/sulphur contamination before welding.
Can CC381H be formed, bent or molded?
Cast-only grade: long freezing range demands large risers, chills and directional solidification; deoxidise with Mn/Si and keep melt free of C, S, Pb to avoid porosity and hot tearing.
CC381H 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 |
|---|---|---|
| Niincludes Co | 29 – 32 | 30 |
| Fecorrosion/erosion resistance | 0.5 – 1.5 | 1 |
| Mndeoxidiser | 0.5 – 1.5 | 1 |
| Nbadded to control weld/casting soundness (C96400 requires Nb) | 0.5 – 1 | 0.7 |
| Sideoxidiser, max | ≤ 0.5 | 0.2 |
| C | ≤ 0.1 | |
| Zn | ≤ 0.5 | |
| Pbmax; embrittling | ≤ 0.01 | |
| S | ≤ 0.02 | |
| P | ≤ 0.02 | |
| Curemainder, approx. 64–69 % | balance |
What surface finishes work on CC381H?
Takes a fine polish and develops a protective brown-green patina in seawater; no anodising — use pickling/passivation or leave bare, and avoid galvanic coupling with steel without insulation or cathodic protection.
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 CC381H in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- C96400
- EN / DIN / Werkstoff-Nr.
- CuNi30Fe1Mn1-C
How much does CC381H cost?
CC381H 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.
CC381H — frequently asked
What is CC381H used for?
CC381H is typically used for marine pump housings, propeller hubs, condenser end covers and seawater piping fittings. In short: stronger than cast 90-10; high-velocity seawater service; weldable cast Cu-Ni.
What is the yield strength of CC381H?
CC381H has a typical yield strength of 255 MPa (37 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 55% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC381H easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Gummy and work-hardening like all Cu-Ni: use sharp positive-rake carbide, low speed (~30–60 m/min) with heavy positive feed, rigid setup and abundant coolant; avoid dwelling to prevent glazing.
Can CC381H be welded?
Yes — weldability is rated very good (75/100). Good weldability with GTAW/GMAW using 70/30 Cu-Ni (ERCuNi) or Ni-Cu filler; keep interpass temperature low, no preheat needed, and remove all oxide/sulphur contamination before welding.
What surface finishes work on CC381H?
Takes a fine polish and develops a protective brown-green patina in seawater; no anodising — use pickling/passivation or leave bare, and avoid galvanic coupling with steel without insulation or cathodic protection.
Can CC381H be formed, bent or molded?
Cast-only grade: long freezing range demands large risers, chills and directional solidification; deoxidise with Mn/Si and keep melt free of C, S, Pb to avoid porosity and hot tearing.
What is the maximum service temperature of CC381H?
CC381H 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 CC381H-GS and CC381H-GZ?
GS is the default condition — standard supply condition for pump casings, valve bodies and large marine housings. GZ: best choice for seawater pipe, sleeves, wear rings and bushings — densest, most sound structure. Yield strength is 255 MPa in GS versus 275 MPa in GZ.
How much does CC381H cost?
CC381H 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
- EN 1982 — Copper and copper alloys: ingots and castings (CuNi30Fe1Mn1-C, CC381H) — CEN (2017)
- ASTM B369 — Copper-Nickel Alloy Castings — ASTM International (2021)
- C96400 alloy datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Copper-Nickel Alloys: Properties and Applications (Pub. 12007) — Nickel Institute / CDA (2016)
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.