Copper Alloy C95800-AC (Spheroidize annealed)
Heat-treated state · default condition
UNS C95800 · ASTM B148 C95800
Standard stocked condition for general marine castings, pump housings and valve bodies where full temper-anneal certification is not required.
Values for the AC condition
Other C95800 tempers and conditions
C95800 is listed in 4 conditions; see the grade overview at C95800.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Temper annealed 675 °C / 6 h, air cool | Choose for naval/propeller and long-life seawater service — the anneal breaks up continuous β phase and maximises resistance to dealuminification and SCC. | 265 | 630 | 25 | 155 HB | 7.5 % IACS |
ACDefaultThis page Spheroidize annealed | Standard stocked condition for general marine castings, pump housings and valve bodies where full temper-anneal certification is not required. | 275 | 655 | 22 | 159 HB | 7 % IACS |
Continuous cast bar/tube | Best for machined bushings, shafts, nuts and stock bar where a homogeneous, low-porosity semi-finished form is wanted. | 290 | 655 | 18 | 170 HB | 7 % IACS |
Centrifugally cast | Pick for rings, sleeves, bushings and pump wear parts needing denser, finer-grained, higher-strength sound sections. | 300 | 690 | 20 | 170 HB | 7 % IACS |
What is C95800-AC?
C95800-AC is C95800 heat treated to AC — standard stocked condition for general marine castings, pump housings and valve bodies where full temper-anneal certification is not required. C95800-AC has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 57% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 115 GPa (16.7 Msi). C95800-AC has a density of 7.64 g/cm³ (0.276 lb/in³), lighter than 92% of copper alloy grades. It melts at 1,043°C (1,909 °F).
Advantages
- Good corrosion resistance — 84/100, better than 100% of copper alloy grades
- Lightweight — 7.64 g/cm³ (0.276 lb/in³), better than 92% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
- Readily welded — 70/100, better than 85% of copper alloy grades
Limitations
- Low electrical conductivity — 7 % IACS, worse than 86% of copper alloy grades
- Poor heat conductor — 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 80% of copper alloy grades
- High embodied carbon — 4.5 kg CO₂/kg, worse than 79% of copper alloy grades
C95800-AC properties
Typical room-temperature values for C95800-AC; 21 are specific to this condition. Other listed values are C95800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C95800-AC has a density of 7.64 g/cm³ (0.276 lb/in³), lighter than 92% of copper alloy grades. It melts at 1,043°C (1,909 °F).
Mechanical15
C95800-AC has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 57% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 115 GPa (16.7 Msi).
Thermal5
C95800-AC is rated for continuous service to 300°C (572 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 80% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C95800-AC conducts electricity at 7 % IACS, worse than 86% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (84/100), better than 100% of copper alloy grades.
Sustainability4
Producing a kilogram of C95800-AC takes about 65 MJ of energy and emits 4.5 kg of CO₂ — more than 81% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C95800-AC's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability very good (70/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C95800-AC
Is C95800 easy to machine?
Tough, gummy chip — use sharp positive-rake carbide, rigid setups, 30–60 m/min with flood coolant; rating ~30 % of free-cutting brass.
Can C95800 be welded?
Readily welded by GTAW/GMAW with ERCuNiAl-A2 filler; preheat 150–200 °C for heavy sections, limit interpass to ~200 °C and re-temper-anneal weld repairs for seawater service.
Can C95800 be formed, bent or molded?
A casting alloy — sand, centrifugal and continuous cast; use bottom gating and filters to avoid alumina film defects, and generous risers because of the narrow freezing range.
What surface finishes work on C95800?
Not anodizable; grind/polish or shot blast, then rely on the natural passive film, cathodic protection or antifouling paint schemes; avoid direct coupling to steel without isolation.
C95800 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 |
|---|---|---|
| Al | 8.5 – 9.5 | 9 |
| NiNi + Co | 4 – 5 | 4.5 |
| FeFe content shall not exceed Ni content | 3.5 – 4.5 | 4 |
| Mn | 0.8 – 1.5 | 1.1 |
| Si | ≤ 0.1 | — |
| Pb | ≤ 0.03 | — |
| Curemainder; ASTM B148 specifies 79.0 % min | ≥ 79 (balance) | — |
C95800-AC — frequently asked
What is C95800-AC used for?
C95800-AC is typically used for ship propellers, seawater pump housings, valve bodies and offshore hardware. In short: highest-strength marine cast bronze; excellent seawater corrosion resistance; hardest to machine of the family.
What is the yield strength of C95800-AC?
C95800-AC has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 57% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C95800-AC easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Tough, gummy chip — use sharp positive-rake carbide, rigid setups, 30–60 m/min with flood coolant; rating ~30 % of free-cutting brass.
Can C95800-AC be welded?
Yes — weldability is rated very good (70/100). Readily welded by GTAW/GMAW with ERCuNiAl-A2 filler; preheat 150–200 °C for heavy sections, limit interpass to ~200 °C and re-temper-anneal weld repairs for seawater service.
What surface finishes work on C95800-AC?
Not anodizable; grind/polish or shot blast, then rely on the natural passive film, cathodic protection or antifouling paint schemes; avoid direct coupling to steel without isolation.
Can C95800-AC be formed, bent or molded?
A casting alloy — sand, centrifugal and continuous cast; use bottom gating and filters to avoid alumina film defects, and generous risers because of the narrow freezing range.
What is the maximum service temperature of C95800-AC?
C95800-AC 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 C95800-AC and C95800 CENT?
AC is the default condition — standard stocked condition for general marine castings, pump housings and valve bodies where full temper-anneal certification is not required. CENT: pick for rings, sleeves, bushings and pump wear parts needing denser, finer-grained, higher-strength sound sections. Yield strength is 275 MPa in AC versus 300 MPa in CENT.
Sources
- ASTM B148 — Aluminum-Bronze Sand Castings — ASTM International (2019)
- ASTM B505/B505M — Continuous Cast Copper Alloys — ASTM International (2022)
- ASTM B271 — Centrifugally Cast Copper-Base Alloys — ASTM International (2018)
- MIL-B-24480 / NAVSEA nickel-aluminum bronze castings — US DoD (1991)
- GB/T 1176 (ZCuAl9Fe4Ni4Mn2) (2013)
- CDA Alloy Datasheet C95800 — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
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.