Copper Alloy C95820
UNS C95820
C95820 is a higher-nickel nickel-aluminum bronze casting alloy, a modification of standard nickel-aluminum bronze aimed at critical seawater valve and pump service.
Reference datasheet — C95820 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
C95820 tempers and conditions
C95820 is supplied in 4 conditions, soft to hard. M01 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 |
|---|---|---|---|---|---|---|
Temper annealed | Specified for naval/critical seawater service: 675 °C temper anneal homogenises κ-phases and removes β/γ2 to maximise dealuminification and SCC resistance. | 300 | 655 | 24 | 180 HB | 7.5 % IACS |
M01Default As sand cast | Standard supply condition for pump casings, valve bodies and general seawater castings. | 310 | 670 | 20 | 190 HB | 7 % IACS |
As continuous cast | Continuous-cast bar and tube stock for machined valve trim, stems and wear rings. | 325 | 690 | 18 | 195 HB | 7 % IACS |
As centrifugally cast | Pick for seamless rings, bushings, bearing sleeves and valve seats needing dense, defect-free walls. | 330 | 700 | 18 | 200 HB | 7 % IACS |
What is C95820?
C95820 is a higher-nickel nickel-aluminum bronze casting alloy, a modification of standard nickel-aluminum bronze aimed at critical seawater valve and pump service. Poured as sand, continuous or centrifugal castings and available temper-annealed (TQ50), it provides 310 MPa yield, 670 MPa tensile, 20% elongation and 190 HB with a corrosion-resistance rating of 82. It is tough and gummy to cut (machinability rating 30), shows about 1.6% solidification shrinkage and needs oxide control in the melt; lower-nickel nickel-aluminum bronzes are the cheaper option where the extra corrosion margin is not needed. C95820 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,040°C (1,904 °F). C95820 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 670 MPa (97.2 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 117 GPa (17 Msi).
What is C95820 used for?
- Seawater valves
- Pump components
- Offshore hardware
Advantages
- Good corrosion resistance — 82/100, better than 98% of copper alloy grades
- Lightweight — 7.58 g/cm³ (0.274 lb/in³), better than 94% 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
- Hard to polish — 65/100, worse than 87% of copper alloy grades
- 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
C95820 properties
Typical room-temperature values for C95820-M01; bars are the position among copper alloy grades.
Physical3
C95820 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,040°C (1,904 °F).
Mechanical16
C95820 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 670 MPa (97.2 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C95820 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
C95820 conducts electricity at 7 % IACS, worse than 86% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 98% of copper alloy grades.
Sustainability4
Producing a kilogram of C95820 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C95820'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. 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. C95820 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C95820
Is C95820 easy to machine?
Tough and gummy: use rigid setups, sharp carbide (K-grade) tooling, positive rake, 60–120 m/min, generous feed and flood coolant; avoid dwelling to prevent work hardening.
Can C95820 be welded?
Readily welded by GTAW/GMAW with ERCuNiAl-A2/A3 filler, preheat 150–200 °C for heavy sections, low heat input, no post-weld quench; 675 °C temper anneal recommended for critical seawater welds.
Can C95820 be formed, bent or molded?
Casting alloy only — high solidification shrinkage (~1.6 %) and oxide-prone melt; use bottom/tilt pouring with filters, generous risering and directional chilling to avoid gas and shrinkage porosity.
C95820 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 | 9 – 10 | 9.5 |
| NiNi + Co | 4.5 – 5.8 | 5 |
| Fe | 4 – 5 | 4.5 |
| Mn | ≤ 1.5 | 1 |
| Si | ≤ 0.1 | |
| Zn | ≤ 0.2 | |
| Sn | ≤ 0.2 | |
| Pb | ≤ 0.03 | |
| Curemainder, 77.5 % min | ≥ 77.5 (balance) |
What surface finishes work on C95820?
Grit blast and pickle to remove alumina film; not anodisable. Can be polished, and normally left bare in seawater (naturally passivating); paint only with etch/epoxy primer, and isolate from stainless/nickel alloys to limit galvanic attack.
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).
How much does C95820 cost?
C95820 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.
C95820 — frequently asked
What is C95820 used for?
C95820 is typically used for seawater valves, pump components and offshore hardware. In short: most corrosion-resistant NAB; weldable seawater bronze; difficult to machine.
What is the yield strength of C95820?
C95820 has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 670 MPa (97.2 ksi) — stronger than 64% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C95820 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Tough and gummy: use rigid setups, sharp carbide (K-grade) tooling, positive rake, 60–120 m/min, generous feed and flood coolant; avoid dwelling to prevent work hardening.
Can C95820 be welded?
Yes — weldability is rated very good (70/100). Readily welded by GTAW/GMAW with ERCuNiAl-A2/A3 filler, preheat 150–200 °C for heavy sections, low heat input, no post-weld quench; 675 °C temper anneal recommended for critical seawater welds.
What surface finishes work on C95820?
Grit blast and pickle to remove alumina film; not anodisable. Can be polished, and normally left bare in seawater (naturally passivating); paint only with etch/epoxy primer, and isolate from stainless/nickel alloys to limit galvanic attack.
Can C95820 be formed, bent or molded?
Casting alloy only — high solidification shrinkage (~1.6 %) and oxide-prone melt; use bottom/tilt pouring with filters, generous risering and directional chilling to avoid gas and shrinkage porosity.
What is the maximum service temperature of C95820?
C95820 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 C95820-M01 and C95820-M02?
M01 is the default condition — standard supply condition for pump casings, valve bodies and general seawater castings. M02: pick for seamless rings, bushings, bearing sleeves and valve seats needing dense, defect-free walls. Yield strength is 310 MPa in M01 versus 330 MPa in M02.
How much does C95820 cost?
C95820 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 B148 — Aluminum-Bronze Sand Castings — ASTM International (2019)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- ASTM B271 — Copper-Base Alloy Centrifugal Castings — ASTM International (2020)
- CDA Alloy Database — C95820 nickel-aluminum bronze — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Nickel-aluminium bronze casting datasheets (marine pump/valve foundries) — various producers (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.