Copper Alloy C64700-TH01
Precip hard
UNS C64700 · ASTM B411 · EN CuNi2Si
TH01 = tD01 and precipitation hardened
Light cold work plus ageing when strength above TF00 is needed with reasonable ductility.
Values for the TH01 condition
Other C64700 tempers and conditions
C64700 is listed in 9 conditions; see the grade overview at C64700.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition for maximum forming/bending before any age hardening. | 125 | 330 | 45 | 80 HB | 42 % IACS |
Solution heat treated | Choose when parts must be deep-drawn, formed or machined before a customer-performed ageing cycle. | 140 | 340 | 45 | 85 HB | 25 % IACS |
Solution heat treated and cold worked, quarter hard | Light cold work before ageing; used when moderate stiffness plus some remaining formability is needed. | 310 | 415 | 25 | 115 HB | 26 % IACS |
Solution heat treated and cold worked, half hard | Half-hard drawn rod/wire for parts to be aged after light forming or heading. | 380 | 460 | 15 | 135 HB | 26 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard stocked condition: best balance of strength, ductility and ~38% IACS conductivity for fasteners, bushings and valve stems. | 415 | 550 | 18 | 165 HB | 38 % IACS |
Solution heat treated and cold worked, full hard | Hard-drawn, un-aged stock: good straightness and strength when ageing will be done after machining. | 450 | 515 | 10 | 155 HB | 27 % IACS |
TH01This page TD01 and precipitation hardened | Light cold work plus ageing when strength above TF00 is needed with reasonable ductility. | 515 | 600 | 14 | 12 HRC | 39 % IACS |
TD02 and precipitation hardened | Half-hard plus age: common for springs, connectors and high-load bushings. | 570 | 655 | 11 | 18 HRC | 40 % IACS |
TD04 and precipitation hardened | Maximum-strength temper for wear parts, high-strength fasteners and welding-electrode holders; lowest ductility. | 655 | 725 | 8 | 22 HRC | 40 % IACS |
What is C64700-TH01?
C64700-TH01 is C64700 in the TH01 condition — light cold work plus ageing when strength above TF00 is needed with reasonable ductility. C64700-TH01 has a yield strength of 515 MPa (74.7 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 132 GPa (19.1 Msi). C64700-TH01 has a density of 8.83 g/cm³ (0.319 lb/in³), heavier than 65% of copper alloy grades. It melts at 1,030°C (1,886 °F). TF00 is the default condition FabDigit quotes; TH01 is available on request or by drawing note.
Advantages
- Stiff — 132 GPa (19.1 Msi), better than 93% of copper alloy grades
- High strength — 515 MPa (74.7 ksi), better than 91% of copper alloy grades
- Readily welded — 70/100, better than 85% of copper alloy grades
C64700-TH01 properties
Typical room-temperature values for C64700-TH01; 21 are specific to this condition. Other listed values are C64700 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C64700-TH01 has a density of 8.83 g/cm³ (0.319 lb/in³), heavier than 65% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical13
C64700-TH01 has a yield strength of 515 MPa (74.7 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 132 GPa (19.1 Msi).
Thermal6
C64700-TH01 is rated for continuous service to 200°C (392 °F). It conducts heat at 158 W/m·K (91.3 BTU/hr·ft·°F), better than 73% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C64700-TH01 conducts electricity at 39 % IACS, better than 74% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C64700-TH01 takes about 62 MJ of energy and emits 4 kg of CO₂ — more than 76% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C64700-TH01's machinability is fair (45/100, better than 64% of copper alloy grades); weldability very good (70/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C64700-TH01
Is C64700 easy to machine?
Machines like a tough medium-strength bronze (~30 % of free-cutting brass); use sharp positive-rake carbide, high speed, generous coolant — best chip control in the aged TF00/TH condition.
Can C64700 be welded?
GTAW/GMAW with matching or silicon-bronze filler is good; keep heat input low and re-age after welding since the HAZ over-ages and softens.
Can C64700 be formed, bent or molded?
Form, head or draw in the TB00/O61 condition, then age at ~450–500 °C for 2–3 h; cold forming in TH tempers risks cracking.
What surface finishes work on C64700?
Not anodizable — polishes to a bright bronze finish and accepts tin, nickel, silver or gold plating; passivate or lacquer to limit atmospheric tarnish.
C64700 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 |
|---|---|---|
| Ni | 1.6 – 2.2 | 1.9 |
| Si | 0.5 – 0.8 | 0.65 |
| Zn | ≤ 0.5 | — |
| Fe | ≤ 0.1 | — |
| Pb | ≤ 0.09 | — |
| Curemainder, Cu + named elements 99.5 % min (Ag counted as Cu) | balance | — |
C64700-TH01 — frequently asked
What is C64700-TH01 used for?
C64700-TH01 is typically used for fasteners, springs and wear-resistant components. In short: age-hardening silicon bronze; strength with 38% IACS; wear-resistant weldable bronze.
What is the yield strength of C64700-TH01?
C64700-TH01 has a typical yield strength of 515 MPa (74.7 ksi) and a tensile strength of 600 MPa (87 ksi) — stronger than 91% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C64700-TH01 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Machines like a tough medium-strength bronze (~30 % of free-cutting brass); use sharp positive-rake carbide, high speed, generous coolant — best chip control in the aged TF00/TH condition.
Can C64700-TH01 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW with matching or silicon-bronze filler is good; keep heat input low and re-age after welding since the HAZ over-ages and softens.
What surface finishes work on C64700-TH01?
Not anodizable — polishes to a bright bronze finish and accepts tin, nickel, silver or gold plating; passivate or lacquer to limit atmospheric tarnish.
Can C64700-TH01 be formed, bent or molded?
Form, head or draw in the TB00/O61 condition, then age at ~450–500 °C for 2–3 h; cold forming in TH tempers risks cracking.
What is the maximum service temperature of C64700-TH01?
C64700-TH01 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C64700-TF00 and C64700-O61?
TF00 is the default condition — standard stocked condition: best balance of strength, ductility and ~38% IACS conductivity for fasteners, bushings and valve stems. O61: softest condition for maximum forming/bending before any age hardening. Yield strength is 415 MPa in TF00 versus 125 MPa in O61.
Sources
- ASTM B411/B411M — Copper-Nickel-Silicon Alloy Rod and Bar — ASTM International (2020)
- CDA Alloy Datasheet C64700 (UNS) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- GB/T 5231 / JIS H3110 C1860 Corson alloy designations — SAC / JISC (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.