Copper Alloy C64710
UNS C64710 · ASTM B98
C64710 is a nickel-modified silicon bronze to ASTM B98, supplied in solution-treated, cold-worked and aged tempers (TB00, TD04, TF00, TH02, TH04) for fasteners and marine fittings.
Reference datasheet — C64710 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 TF00 condition
C64710 tempers and conditions
C64710 is supplied in 9 conditions, soft to hard. TF00 is the default FabDigit quotes; the values on this page are for it.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Maximum ductility for deep forming, heading or bending before ageing. | 130 | 330 | 45 | 75 HB | 14 % IACS |
Solution heat treated | Supply condition for parts that will be formed/headed and then aged by the fabricator. | 150 | 350 | 45 | 80 HB | 10 % IACS |
As hot rolled | Mill as-extruded bar before heat treatment; only for re-heat-treated or lightly loaded parts. | 170 | 380 | 35 | 90 HB | 15 % IACS |
Half hard | Cold-drawn intermediate temper when moderate strength plus some formability is needed without ageing. | 380 | 470 | 15 | 140 HB | 13 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard stocked high-strength condition for marine bolts, studs, shafts and fittings. | 480 | 620 | 15 | 180 HB | 25 % IACS |
Full hard | Cold-drawn hard rod/wire for springs and screw-machine stock where no ageing furnace is available. | 480 | 550 | 9 | 160 HB | 13 % IACS |
Solution heat treated and cold worked, full hard | Cold-worked after solution treatment; intermediate stock for TH tempers or for high-strength unaged wire. | 490 | 560 | 10 | 165 HB | 11 % IACS |
TD02 and precipitation hardened | Moderate cold work before ageing for a strength/ductility balance above TF00. | 570 | 660 | 11 | 13 HRC | 25 % IACS |
TD04 and precipitation hardened | Highest-strength temper for heavily loaded bolts, pins and springs where ductility can be traded away. | 640 | 720 | 8 | 21 HRC | 25 % IACS |
What is C64710?
C64710 is a nickel-modified silicon bronze to ASTM B98, supplied in solution-treated, cold-worked and aged tempers (TB00, TD04, TF00, TH02, TH04) for fasteners and marine fittings. The precipitation response gives 620 MPa tensile strength, 480 MPa yield, 15 % elongation and 180 HB (88 HRB), with 25 % IACS electrical conductivity, 50 W/m·K thermal conductivity and service to about 230 °C. It welds and cold-heads better than the high-aluminum bronzes (weldability 70, formability 40, corrosion resistance 72), but aged material has limited formability and the HAZ loses precipitation strength. Plain silicon bronze C65500 is the lower-strength alternative. C64710 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 1,055°C (1,931 °F). C64710 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 131 GPa (19 Msi).
What is C64710 used for?
- marine fasteners
- high-strength bolts
- corrosion-resistant fittings
Advantages
- Stiff — 131 GPa (19 Msi), better than 91% of copper alloy grades
- High strength — 480 MPa (69.6 ksi), better than 88% of copper alloy grades
- Readily welded — 70/100, better than 85% of copper alloy grades
- Good corrosion resistance — 72/100, better than 84% of copper alloy grades
C64710 properties
Typical room-temperature values for C64710-TF00; bars are the position among copper alloy grades.
Physical3
C64710 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 1,055°C (1,931 °F).
Mechanical14
C64710 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 131 GPa (19 Msi).
Thermal6
C64710 is rated for continuous service to 230°C (446 °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 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C64710 conducts electricity at 25 % IACS, better than 59% 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 C64710 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C64710's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability very good (70/100); formability fair (40/100).
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. C64710 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C64710
Is C64710 easy to machine?
Rating ~30 % of C36000: use sharp positive-rake carbide, moderate speeds, generous coolant; chips are gummy in the solution-treated state so machine in TF00/TH04 for best finish.
Can C64710 be welded?
GTAW/GMAW with matching or Si-bronze filler is practical; keep heat input low and re-age critical joints because the HAZ loses precipitation strength.
Can C64710 be formed, bent or molded?
Head, bend and cold form in O60/TB00 then age; formability is limited once aged, and hot working is done around 750–870 °C.
C64710 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 |
|---|---|---|
| NiNi+Co counted together in some registrations | 1.6 – 2.2 | 1.9 |
| Si | 0.4 – 0.8 | 0.6 |
| Zn | ≤ 0.5 | |
| Fe | ≤ 0.2 | |
| Mn | ≤ 0.2 | |
| Sn | ≤ 0.2 | |
| Pb | ≤ 0.05 | |
| Cu≈96–97 %; composition limits close to C64700, verify against current CDA/ASTM B98 registration | balance |
What surface finishes work on C64710?
Not anodisable — polishes to a bright bronze lustre; tin, nickel or chromate/patina finishes are used, and passivation is unnecessary for marine service.
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 C64710 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B98
How much does C64710 cost?
C64710 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.
C64710 — frequently asked
What is C64710 used for?
C64710 is typically used for marine fasteners, high-strength bolts and corrosion-resistant fittings. In short: age-hardenable silicon bronze; weldable high-strength bronze; cold-headable fastener alloy.
What is the yield strength of C64710?
C64710 has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 88% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C64710 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Rating ~30 % of C36000: use sharp positive-rake carbide, moderate speeds, generous coolant; chips are gummy in the solution-treated state so machine in TF00/TH04 for best finish.
Can C64710 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW with matching or Si-bronze filler is practical; keep heat input low and re-age critical joints because the HAZ loses precipitation strength.
What surface finishes work on C64710?
Not anodisable — polishes to a bright bronze lustre; tin, nickel or chromate/patina finishes are used, and passivation is unnecessary for marine service.
Can C64710 be formed, bent or molded?
Head, bend and cold form in O60/TB00 then age; formability is limited once aged, and hot working is done around 750–870 °C.
What is the maximum service temperature of C64710?
C64710 is rated for continuous use to about 230°C (446 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C64710-TF00 and C64710-O60?
TF00 is the default condition — standard stocked high-strength condition for marine bolts, studs, shafts and fittings. O60: maximum ductility for deep forming, heading or bending before ageing. Yield strength is 480 MPa in TF00 versus 130 MPa in O60.
How much does C64710 cost?
C64710 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 B98/B98M — Copper-Silicon Alloy Rod, Bar and Shapes — ASTM International (2020)
- CDA/UNS Copper Alloy Datasheets (C647xx nickel-silicon bronzes) — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (copper alloys in seawater) — ASM International (2005)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
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.