Copper Alloy C72650-TH04
Precip hard
UNS C72650
TH04 = tD04 and precipitation hardened
Mill-hardened balanced temper for springs, connectors and fasteners needing strength with retained ductility.
Values for the TH04 condition
Other C72650 tempers and conditions
C72650 is listed in 6 conditions; see the grade overview at C72650.
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 |
TH04This page 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-TH04?
C72650-TH04 is C72650 in the TH04 condition — mill-hardened balanced temper for springs, connectors and fasteners needing strength with retained ductility. C72650-TH04 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 95% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 135 GPa (19.6 Msi). C72650-TH04 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). CX105 is the default condition FabDigit quotes; TH04 is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 95% 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
C72650-TH04 properties
Typical room-temperature values for C72650-TH04; 10 are specific to this condition. Other listed values are C72650 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C72650-TH04 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-TH04 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 95% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 135 GPa (19.6 Msi).
Thermal6
C72650-TH04 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-TH04 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-TH04 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-TH04's machinability is very good (80/100, better than 86% of copper alloy grades); weldability fair (35/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C72650-TH04
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.
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.
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 | — |
C72650-TH04 — frequently asked
What is C72650-TH04 used for?
C72650-TH04 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-TH04?
C72650-TH04 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 95% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C72650-TH04 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-TH04 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-TH04?
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-TH04 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-TH04?
C72650-TH04 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.