Copper Alloy C63020
UNS C63020 · ASTM B150
C63020 is a high-strength nickel-aluminum bronze from the wrought C60000 series, supplied to ASTM B150 as rod, bar and forgings in tempers such as TQ50, HR50, M30, M20 and O60.
Reference datasheet — C63020 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 TQ50 condition
C63020 tempers and conditions
C63020 is supplied in 5 conditions, soft to hard. TQ50 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 |
|---|---|---|---|---|---|---|
Soft annealed | Furnace-annealed condition supplied for maximum ductility prior to heavy machining or hot working; not a service condition for structural loads. | 450 | 760 | 20 | 15 HRC | 7.5 % IACS |
As hot rolled | Near-net forged shafts, flanges and valve bodies before heat treatment; usually followed by TQ50 to meet B150 minima. | 520 | 800 | 17 | 19 HRC | 7 % IACS |
As hot extruded | Mill-condition bar taken straight from extrusion; pick it when parts will be heat treated after rough machining or when full TQ50 strength is not needed. | 550 | 830 | 16 | 21 HRC | — |
Drawn and stress relieved | Cold-drawn small-diameter bar with a stress-relief anneal; chosen for straightness, tighter tolerance and good surface on fasteners and pins. | 650 | 900 | 12 | 26 HRC | 7 % IACS |
TQ50Default Quench hardened and tempered | Standard stocked condition for C63020 bar/forgings; use whenever the full 900 MPa class strength and ASTM B150 property minima are required. | 725 | 965 | 13 | 29 HRC | 7 % IACS |
What is C63020?
C63020 is a high-strength nickel-aluminum bronze from the wrought C60000 series, supplied to ASTM B150 as rod, bar and forgings in tempers such as TQ50, HR50, M30, M20 and O60. In the default heat-treated condition it reaches 725 MPa yield and 965 MPa tensile with 13 % elongation and 285 HB (29 HRC), which is why it is specified for heavily loaded marine and aerospace parts that must also survive seawater. The trade-offs are low machinability (rated 28), 7 % IACS electrical and 40 W/m·K thermal conductivity, a 300 °C service ceiling and effectively no cold formability. C63200 is the lower-strength, easier-to-weld alternative. C63020 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,027°C (1,881 °F). C63020 has a yield strength of 725 MPa (105 ksi) and a tensile strength of 965 MPa (140 ksi) — stronger than 97% of copper alloy grades. Elongation at break is 13% and the elastic modulus is 117 GPa (17 Msi).
What is C63020 used for?
- marine gears
- high-load bushings
- aerospace fittings
- pump components
Advantages
- High strength — 725 MPa (105 ksi), better than 97% of copper alloy grades
- Lightweight — 7.58 g/cm³ (0.274 lb/in³), better than 94% of copper alloy grades
- Good corrosion resistance — 78/100, better than 94% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
Limitations
- Low electrical conductivity — 7 % IACS, worse than 86% of copper alloy grades
- Poor heat conductor — 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 82% of copper alloy grades
C63020 properties
Typical room-temperature values for C63020-TQ50; bars are the position among copper alloy grades.
Physical3
C63020 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,027°C (1,881 °F).
Mechanical16
C63020 has a yield strength of 725 MPa (105 ksi) and a tensile strength of 965 MPa (140 ksi) — stronger than 97% of copper alloy grades. Elongation at break is 13% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C63020 is rated for continuous service to 300°C (572 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 82% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C63020 conducts electricity at 7 % IACS, worse than 86% 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 C63020 takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C63020's machinability is poor (28/100, worse than 78% of copper alloy grades); weldability fair (45/100); 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. C63020 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C63020
Is C63020 easy to machine?
Machine at low surface speed with rigid setups, positive-rake carbide or CBN and generous coolant; hard κ-phase particles cause rapid tool wear, chips are stringy — chip-break by interrupted feed.
Can C63020 be welded?
GTAW/GMAW with matching NAB filler (ERCuNiAl / AWS A5.7 A-2); preheat 150–200 °C, control interpass below ~250 °C and post-weld temper at ~675 °C to restore corrosion resistance and avoid gamma-2.
Can C63020 be formed, bent or molded?
Hot work between about 850 and 950 °C only; cold formability is very poor — no significant bending or cold heading in the TQ50 condition.
C63020 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 | 10 – 11 | 10.5 |
| NiNi + Co | 4.2 – 6 | 5 |
| Fe | 4 – 5.5 | 4.7 |
| Mn | ≤ 1.5 | 0.8 |
| Si | ≤ 0.25 | |
| Zn | ≤ 0.3 | |
| Sn | ≤ 0.25 | |
| Pb | ≤ 0.03 | |
| Curemainder, 74.5 % min | ≥ 74.5 (balance) |
What surface finishes work on C63020?
Not anodizable; pickle/passivate after heat treatment, then mechanically polish or bead-blast. Accepts electroless nickel or chrome plating with proper activation; naturally forms a protective olive-brown alumina/oxide film in seawater.
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 C63020 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B150
How much does C63020 cost?
C63020 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.
C63020 — frequently asked
What is C63020 used for?
C63020 is typically used for marine gears, high-load bushings, aerospace fittings and pump components. In short: highest-strength aluminum bronze; heat-treatable nickel-aluminum bronze; seawater service to 300 °C.
What is the yield strength of C63020?
C63020 has a typical yield strength of 725 MPa (105 ksi) and a tensile strength of 965 MPa (140 ksi) — stronger than 97% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C63020 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 78% of copper alloy grades). Machine at low surface speed with rigid setups, positive-rake carbide or CBN and generous coolant; hard κ-phase particles cause rapid tool wear, chips are stringy — chip-break by interrupted feed.
Can C63020 be welded?
With care — weldability is rated fair (45/100). GTAW/GMAW with matching NAB filler (ERCuNiAl / AWS A5.7 A-2); preheat 150–200 °C, control interpass below ~250 °C and post-weld temper at ~675 °C to restore corrosion resistance and avoid gamma-2.
What surface finishes work on C63020?
Not anodizable; pickle/passivate after heat treatment, then mechanically polish or bead-blast. Accepts electroless nickel or chrome plating with proper activation; naturally forms a protective olive-brown alumina/oxide film in seawater.
Can C63020 be formed, bent or molded?
Hot work between about 850 and 950 °C only; cold formability is very poor — no significant bending or cold heading in the TQ50 condition.
What is the maximum service temperature of C63020?
C63020 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 C63020-TQ50 and C63020-O60?
TQ50 is the default condition — standard stocked condition for C63020 bar/forgings; use whenever the full 900 MPa class strength and ASTM B150 property minima are required. O60: furnace-annealed condition supplied for maximum ductility prior to heavy machining or hot working; not a service condition for structural loads. Yield strength is 725 MPa in TQ50 versus 450 MPa in O60.
How much does C63020 cost?
C63020 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 B150/B150M — Aluminum Bronze Rod, Bar and Shapes — ASTM International (2019)
- CDA/UNS Alloy Data — C630xx Nickel-Aluminum Bronzes — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Nickel-Aluminium Bronze bar and forging datasheets — Specialty copper alloy 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.