Copper Alloy CC383H-SR (Stress relieved)
Heat-treated state
EN CC383H · UNS C96900
Use after major weld repair or for dimensionally critical parts; trades a little yield strength for lower residual stress and better ductility.
Values for the SR condition
Other CC383H tempers and conditions
CC383H is listed in 5 conditions; see the grade overview at CC383H.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SRThis page 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-SR?
CC383H-SR is CC383H heat treated to SR — use after major weld repair or for dimensionally critical parts; trades a little yield strength for lower residual stress and better ductility. CC383H-SR has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 56% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 150 GPa (21.8 Msi). CC383H-SR 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). GS is the default condition FabDigit quotes; SR is available on request or by drawing note.
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 — 85/100, better than 95% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
Limitations
- Low electrical conductivity — 4.8 % IACS, worse than 95% of copper alloy grades
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 91% of copper alloy grades
- High embodied carbon — 5.6 kg CO₂/kg, worse than 91% of copper alloy grades
CC383H-SR properties
Typical room-temperature values for CC383H-SR; 20 are specific to this condition. Other listed values are CC383H reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC383H-SR 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-SR has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 56% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 150 GPa (21.8 Msi).
Thermal5
CC383H-SR is rated for continuous service to 300°C (572 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 91% of copper alloy grades. Thermal expansion is 15.8 µm/m·K (8.78 µin/in·°F).
Electrical3
CC383H-SR conducts electricity at 4.8 % IACS, worse than 95% 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 CC383H-SR 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-SR's machinability is poor (33/100, worse than 53% of copper alloy grades); weldability excellent (85/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC383H-SR
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.
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.
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 | — |
CC383H-SR — frequently asked
What is CC383H-SR used for?
CC383H-SR 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-SR?
CC383H-SR has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 56% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is CC383H-SR easy to machine?
Not especially — machinability is rated poor (33/100, worse than 53% 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-SR be welded?
Yes — weldability is rated excellent (85/100). 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-SR?
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-SR 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-SR?
CC383H-SR 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.