Copper Alloy C95820-TQ50
Supply condition
UNS C95820
TQ50 = 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.
Values for the TQ50 condition
Other C95820 tempers and conditions
C95820 is listed in 4 conditions; see the grade overview at C95820.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
TQ50This page 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-TQ50?
C95820-TQ50 is C95820 supplied in the TQ50 condition — specified for naval/critical seawater service: 675 °C temper anneal homogenises κ-phases and removes β/γ2 to maximise dealuminification and SCC resistance. C95820-TQ50 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 61% of copper alloy grades. Elongation at break is 24% and the elastic modulus is 117 GPa (17 Msi). C95820-TQ50 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). M01 is the default condition FabDigit quotes; TQ50 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 88/100, better than 100% of copper alloy grades
- Lightweight — 7.58 g/cm³ (0.274 lb/in³), better than 94% of copper alloy grades
- Readily welded — 74/100, better than 88% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
Limitations
- Hard to polish — 65/100, worse than 87% of copper alloy grades
- Low electrical conductivity — 7.5 % IACS, worse than 84% 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-TQ50 properties
Typical room-temperature values for C95820-TQ50; 22 are specific to this condition. Other listed values are C95820 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C95820-TQ50 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-TQ50 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 61% of copper alloy grades. Elongation at break is 24% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C95820-TQ50 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-TQ50 conducts electricity at 7.5 % IACS, worse than 84% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 100% of copper alloy grades.
Sustainability4
Producing a kilogram of C95820-TQ50 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-TQ50's machinability is poor (33/100, worse than 53% of copper alloy grades); weldability very good (74/100); formability poor (24/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C95820-TQ50
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.
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.
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) | — |
C95820-TQ50 — frequently asked
What is C95820-TQ50 used for?
C95820-TQ50 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-TQ50?
C95820-TQ50 has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 61% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C95820-TQ50 easy to machine?
Not especially — machinability is rated poor (33/100, worse than 53% 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-TQ50 be welded?
Yes — weldability is rated very good (74/100). 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-TQ50?
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-TQ50 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-TQ50?
C95820-TQ50 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.