Copper Alloy C63020-M20
Finish state
UNS C63020 · ASTM B150
M20 = as hot rolled
Near-net forged shafts, flanges and valve bodies before heat treatment; usually followed by TQ50 to meet B150 minima.
Values for the M20 condition
Other C63020 tempers and conditions
C63020 is listed in 5 conditions; see the grade overview at C63020.
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 |
M20This page 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-M20?
C63020-M20 is C63020 supplied in the M20 condition — near-net forged shafts, flanges and valve bodies before heat treatment; usually followed by TQ50 to meet B150 minima. C63020-M20 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 17% and the elastic modulus is 117 GPa (17 Msi). C63020-M20 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). TQ50 is the default condition FabDigit quotes; M20 is available on request or by drawing note.
Advantages
- 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 strength — 520 MPa (75.4 ksi), better than 91% of copper alloy grades
- Tough — resists crack growth — 55 MPa·√m (50.1 ksi·√in), better than 85% 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-M20 properties
Typical room-temperature values for C63020-M20; 23 are specific to this condition. Other listed values are C63020 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C63020-M20 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-M20 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 17% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C63020-M20 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-M20 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-M20 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-M20's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability fair (50/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C63020-M20
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.
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.
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) | — |
C63020-M20 — frequently asked
What is C63020-M20 used for?
C63020-M20 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-M20?
C63020-M20 has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 91% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C63020-M20 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% 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-M20 be welded?
With care — weldability is rated fair (50/100). 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-M20?
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-M20 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-M20?
C63020-M20 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.