Copper Alloy C72650
UNS C72650
C72650 (Toughmet 2) is a spinodally hardened copper-nickel-tin alloy in the C70000–C79999 family that reaches 745 MPa yield, 795 MPa tensile and 29 HRC without beryllium.
Reference datasheet — C72650 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 CX105 condition
C72650 tempers and conditions
C72650 is supplied in 6 conditions, soft to hard. CX105 is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution heat treated | Choose for deep forming, heading or machining of complex shapes before spinodal aging. | 210 | 450 | 40 | 115 HB | 9 % IACS |
Solution heat treated and precipitation hardened | Aged-only condition for parts formed or machined soft and then hardened, giving uniform properties in thick sections. | 490 | 700 | 16 | 21 HRC | 12.5 % IACS |
Solution heat treated and cold worked, full hard | Cold-drawn hard rod/strip when moderate strength plus some further forming is needed before aging. | 580 | 660 | 9 | 18 HRC | 9.5 % IACS |
TD04 and precipitation hardened | Mill-hardened balanced temper for springs, connectors and fasteners needing strength with retained ductility. | 620 | 720 | 12 | 24 HRC | 12 % IACS |
CX105Default Cold worked / spinodal-hardened rod, 105 ksi min yield | Standard stocked bar/tube condition for bushings, bearings and wear parts — best combination of strength, hardness and machinability. | 745 | 795 | 8 | 29 HRC | 12 % IACS |
Mill hardened, 110 ksi min tensile class | Highest-strength stocked strip/rod temper for high-load springs and small precision wear parts. | 760 | 830 | 6 | 31 HRC | 11.5 % IACS |
What is C72650?
C72650 (Toughmet 2) is a spinodally hardened copper-nickel-tin alloy in the C70000–C79999 family that reaches 745 MPa yield, 795 MPa tensile and 29 HRC without beryllium. It is chosen for connectors, bearings and springs that need strength with 12% IACS conductivity, 50 W/m·K thermal conductivity and good wear and corrosion resistance; bar, rod and strip are available in solution-treated TB00 through aged CX105 and TS110 tempers. Formability is limited (score 30) once aged, service is capped near 250 °C, and fusion welding destroys the temper. Beryllium copper is the nearest alternative where restricted-material rules allow it. C72650 has a density of 8.85 g/cm³ (0.32 lb/in³), heavier than 66% of copper alloy grades. It melts at 1,030°C (1,886 °F). C72650 has a yield strength of 745 MPa (108 ksi) and a tensile strength of 795 MPa (115 ksi) — stronger than 97% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 135 GPa (19.6 Msi).
What is C72650 used for?
- electrical connectors
- bearings
- springs
- wear plates
Advantages
- High strength — 745 MPa (108 ksi), better than 97% of copper alloy grades
- Stiff — 135 GPa (19.6 Msi), better than 93% of copper alloy grades
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
- Easy to machine — 80/100, better than 86% of copper alloy grades
- Good corrosion resistance — 72/100, better than 84% of copper alloy grades
Limitations
- Limited ductility — 8%, worse than 83% of copper alloy grades
C72650 properties
Typical room-temperature values for C72650-CX105; bars are the position among copper alloy grades.
Physical3
C72650 has a density of 8.85 g/cm³ (0.32 lb/in³), heavier than 66% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical15
C72650 has a yield strength of 745 MPa (108 ksi) and a tensile strength of 795 MPa (115 ksi) — stronger than 97% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 135 GPa (19.6 Msi).
Thermal6
C72650 is rated for continuous service to 250°C (482 °F). It conducts heat at 50 W/m·K (28.9 BTU/hr·ft·°F), worse than 66% of copper alloy grades. Thermal expansion is 16.5 µm/m·K (9.17 µin/in·°F).
Electrical3
C72650 conducts electricity at 12 % IACS, worse than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 84% of copper alloy grades.
Sustainability4
Producing a kilogram of C72650 takes about 65 MJ of energy and emits 4.2 kg of CO₂ — more than 81% of copper alloy grades. Typical recycled content is 30%.
Manufacturability7
C72650's machinability is very good (80/100, better than 86% of copper alloy grades); weldability fair (35/100); formability poor (30/100).
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. C72650 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C72650
Is C72650 easy to machine?
Machines very well in hardened tempers with fine, non-gummy chips — use sharp carbide, positive rake, high speed and flood coolant; no lead needed for chip breaking.
Can C72650 be welded?
Fusion welding is not recommended for load-bearing joints since heat destroys the spinodal temper; if required use low-heat GTAW with Cu-Ni filler and expect local softening.
Can C72650 be formed, bent or molded?
Form, coin or bend in TB00/soft temper and then spinodally age; hardened CX/TS tempers tolerate only gentle large-radius bending.
C72650 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 |
|---|---|---|
| Nispinodal-forming addition with Sn | 7 – 9 | 8 |
| Sn | 4 – 6 | 5 |
| Mndeoxidizer, optional | ≤ 0.3 | 0.1 |
| Feimpurity limit | ≤ 0.5 | |
| Znimpurity limit | ≤ 0.5 | |
| Pbimpurity limit | ≤ 0.02 | |
| Curemainder, nominally ~87% | balance |
What surface finishes work on C72650?
Polishes to low-Ra bearing surfaces; accepts electroless nickel, tin or silver plating; not anodizable, and natural surface develops a dark oxide/patina.
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 C72650 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- Toughmet 2
How much does C72650 cost?
C72650 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.
C72650 — frequently asked
What is C72650 used for?
C72650 is typically used for electrical connectors, bearings, springs and wear plates. In short: beryllium-free high-strength copper; best-machining copper-nickel; bearing and connector duty.
What is the yield strength of C72650?
C72650 has a typical yield strength of 745 MPa (108 ksi) and a tensile strength of 795 MPa (115 ksi) — stronger than 97% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C72650 easy to machine?
Yes — machinability is rated very good (80/100, better than 86% of copper alloy grades). Machines very well in hardened tempers with fine, non-gummy chips — use sharp carbide, positive rake, high speed and flood coolant; no lead needed for chip breaking.
Can C72650 be welded?
With care — weldability is rated fair (35/100). Fusion welding is not recommended for load-bearing joints since heat destroys the spinodal temper; if required use low-heat GTAW with Cu-Ni filler and expect local softening.
What surface finishes work on C72650?
Polishes to low-Ra bearing surfaces; accepts electroless nickel, tin or silver plating; not anodizable, and natural surface develops a dark oxide/patina.
Can C72650 be formed, bent or molded?
Form, coin or bend in TB00/soft temper and then spinodally age; hardened CX/TS tempers tolerate only gentle large-radius bending.
What is the maximum service temperature of C72650?
C72650 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C72650-CX105 and C72650-TB00?
CX105 is the default condition — standard stocked bar/tube condition for bushings, bearings and wear parts — best combination of strength, hardness and machinability. TB00: choose for deep forming, heading or machining of complex shapes before spinodal aging. Yield strength is 745 MPa in CX105 versus 210 MPa in TB00.
How much does C72650 cost?
C72650 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
- ToughMet 2 CX / TS alloy (C72650) technical data — Materion Performance Alloys (2023)
- Copper Alloy C72650 datasheet — Copper Development Association (copper.org) (2022)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASTM B505/B505M — Copper-Base Alloy Continuous Castings / temper designations ASTM B601 — ASTM International (2018)
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.