Copper Alloy CC383H
EN CC383H · UNS C96900
CC383H is a niobium- and silicon-stabilised 30 % nickel cast copper-nickel (CuNi30Fe1Mn1NbSi-C, equivalent to C96900), available as sand, die, centrifugal and continuous castings and in a stress-relieved (SR) condition.
Reference datasheet — CC383H 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
CC383H tempers and conditions
CC383H is supplied in 5 conditions, soft to hard. GS 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 | Use after major weld repair or for dimensionally critical parts; trades a little yield strength for lower residual stress and better ductility. | 270 | 470 | 25 | 130 HB | 4.8 % IACS |
GSDefault Sand cast, as-cast | Standard route for pump casings, valve bodies and complex marine housings. | 290 | 480 | 22 | 140 HB | 4.6 % IACS |
Permanent (chill) mould cast | Chill casting of simpler repeat parts; finer structure and slightly higher strength than sand cast. | 300 | 495 | 20 | 145 HB | 4.6 % IACS |
Continuously cast bar/tube | Semi-finished bar and hollow stock for machined valve trim, flanges and fittings. | 300 | 500 | 20 | 145 HB | 4.6 % IACS |
Centrifugally cast | Best choice for seawater pipe, sleeves, bushings and rings needing dense, porosity-free walls. | 310 | 510 | 20 | 150 HB | 4.6 % IACS |
What is CC383H?
CC383H is a niobium- and silicon-stabilised 30 % nickel cast copper-nickel (CuNi30Fe1Mn1NbSi-C, equivalent to C96900), available as sand, die, centrifugal and continuous castings and in a stress-relieved (SR) condition. The niobium addition raises strength to 290 MPa yield and 480 MPa tensile at 22 % elongation and 140 HB, and improves resistance to weld and repair cracking, which is why it is used for propellers and high-load marine castings. Machinability is only about 20 % of AISI 1212, nickel content makes it costly, and it is a casting-only grade; CC381H is the standard 70-30 alternative. CC383H 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). CC383H has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 150 GPa (21.8 Msi).
What is CC383H used for?
- ship propellers
- high-load pump castings
- offshore hardware
Advantages
- Stiff — 150 GPa (21.8 Msi), better than 98% of copper alloy grades
- Good corrosion resistance — 78/100, better than 94% 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 — 4.6 % IACS, worse than 96% of copper alloy grades
- Poor heat conductor — 29 W/m·K (16.8 BTU/hr·ft·°F), worse than 93% of copper alloy grades
- High embodied carbon — 5.6 kg CO₂/kg, worse than 91% of copper alloy grades
CC383H properties
Typical room-temperature values for CC383H-GS; bars are the position among copper alloy grades.
Physical3
CC383H 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).
Mechanical14
CC383H has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 150 GPa (21.8 Msi).
Thermal5
CC383H is rated for continuous service to 300°C (572 °F). It conducts heat at 29 W/m·K (16.8 BTU/hr·ft·°F), worse than 93% of copper alloy grades. Thermal expansion is 15.8 µm/m·K (8.78 µin/in·°F).
Electrical3
CC383H conducts electricity at 4.6 % IACS, worse than 96% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of copper alloy grades.
Sustainability4
Producing a kilogram of CC383H takes about 90 MJ of energy and emits 5.6 kg of CO₂ — more than 93% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
CC383H's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability very good (80/100); formability poor (25/100).
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. CC383H is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CC383H
Is CC383H easy to machine?
Gummy and work-hardening — use sharp positive-rake carbide, heavy positive feed, rigid setups and generous coolant; rating ≈20 % of AISI 1212.
Can CC383H be welded?
Very good with GTAW/GMAW using ERCuNi (70/30) filler, no preheat, low interpass temperature, and iron/sulphur-free clean surfaces; Nb greatly reduces weld and repair cracking.
Can CC383H be formed, bent or molded?
Casting alloy only — long freezing range demands large risers, directional solidification and chilled sections; keep Pb/S contamination out of the melt to avoid hot tearing.
CC383H 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 | 29 – 32 | 30.5 |
| Feimpingement resistance | 0.4 – 1 | 0.7 |
| Mn | 0.5 – 1.5 | 1 |
| Nbcarbide/nitride stabiliser, improves weldability and strength | 0.5 – 1.5 | 0.9 |
| Sideoxidiser / strengthener | 0.15 – 0.5 | 0.3 |
| Zn | ≤ 0.5 | |
| C | ≤ 0.05 | |
| S | ≤ 0.02 | |
| P | ≤ 0.02 | |
| Pbmax, hot-cracking control | ≤ 0.01 | |
| Curemainder, ~64–68 % | balance |
What surface finishes work on CC383H?
Normally supplied bare so the protective seawater film can develop; pickle/passivate after welding, avoid ferrous smearing, and use marine paint systems only where fouling control demands it.
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 CC383H in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- C96900
- EN / DIN / Werkstoff-Nr.
- CuNi30Fe1Mn1NbSi-C
How much does CC383H cost?
CC383H 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.
CC383H — frequently asked
What is CC383H used for?
CC383H is typically used for ship propellers, high-load pump castings and offshore hardware. In short: strongest cast Cu-Ni here; niobium-stabilised for weld repair; marine propulsion castings.
What is the yield strength of CC383H?
CC383H has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 480 MPa (69.6 ksi) — stronger than 60% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is CC383H easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Gummy and work-hardening — use sharp positive-rake carbide, heavy positive feed, rigid setups and generous coolant; rating ≈20 % of AISI 1212.
Can CC383H be welded?
Yes — weldability is rated very good (80/100). Very good with GTAW/GMAW using ERCuNi (70/30) filler, no preheat, low interpass temperature, and iron/sulphur-free clean surfaces; Nb greatly reduces weld and repair cracking.
What surface finishes work on CC383H?
Normally supplied bare so the protective seawater film can develop; pickle/passivate after welding, avoid ferrous smearing, and use marine paint systems only where fouling control demands it.
Can CC383H be formed, bent or molded?
Casting alloy only — long freezing range demands large risers, directional solidification and chilled sections; keep Pb/S contamination out of the melt to avoid hot tearing.
What is the maximum service temperature of CC383H?
CC383H 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 CC383H-GS and CC383H-GZ?
GS is the default condition — standard route for pump casings, valve bodies and complex marine housings. GZ: best choice for seawater pipe, sleeves, bushings and rings needing dense, porosity-free walls. Yield strength is 290 MPa in GS versus 310 MPa in GZ.
How much does CC383H cost?
CC383H 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 — CEN (2017)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Copper-nickel alloy datasheets and seawater service guidance — Copper Development Association / Nickel Institute (2020)
- Cast copper-nickel marine components (foundry typical properties) — Cu-Ni foundry datasheets (2022)
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.