Copper Alloy Cu-OF
UNS C10200 · EN CR008A · JIS C1020 · GB TU1
Cu-OF (C10200) is oxygen-free copper with oxygen held at 10 ppm or less, supplied as wrought bar, sheet and strip in O60 through H10 tempers and as gas-atomized powder for L-PBF, EB-PBF, binder jetting and DED.
Reference datasheet — Cu-OF 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.
Cu-OF tempers and conditions
Cu-OF is supplied in 14 conditions, soft to hard.
Compare all 14 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed to 0.050 mm grain size | Coarse-grain soft temper for maximum drawability and lowest springback. | 69 | 220 | 48 | 42 HB | 101 % IACS |
Soft annealed | Wrought benchmark condition: maximum conductivity and formability, minimum strength. | 70 | 225 | 45 | 45 HB | 101 % IACS |
As hot rolled | Mill condition of hot-worked plate and extrusion, essentially soft with mill surface. | 70 | 215 | 45 | 45 HB | 101 % IACS |
Binder Jetted + Sintered | Lowest-cost route for complex heat-sink geometries; 95–99 % density leaves some loss of strength and conductivity. | 75 | 175 | 25 | 45 HB | 88 % IACS |
Annealed to 0.025 mm grain size | Fine-grain soft strip for deep drawing with good surface finish. | 85 | 235 | 42 | 48 HB | 101 % IACS |
EB-PBF As-Built | Vacuum EB melting gives near-full density and >97 % IACS as-built; best route for large conductive parts. | 95 | 200 | 45 | 52 HB | 98 % IACS |
1/8 hard | Light cold work when slightly higher stiffness than soft is needed but forming is still required. | 165 | 240 | 35 | 60 HB | 101 % IACS |
Quarter hard | Standard bendable temper for busbar and terminals needing some stiffness. | 195 | 260 | 30 | 68 HB | 101 % IACS |
Half hard | Most-stocked cold-worked temper for busbar, terminals and machined fittings. | 250 | 285 | 14 | 80 HB | 100 % IACS |
Hard drawn | As-drawn tube temper for rigid conductive tubing and waveguide bodies. | 250 | 290 | 15 | 85 HB | 100 % IACS |
Full hard | Hard temper for straight bar, hard-drawn wire and contacts where strength and machining behaviour matter. | 300 | 325 | 8 | 92 HB | 100 % IACS |
Extra hard | Higher cold work for thin strip and wire where formability is no longer needed. | 320 | 345 | 6 | 96 HB | 99 % IACS |
Spring hard | Spring-hard strip/wire for contacts and gaskets requiring elastic stiffness. | 340 | 365 | 4 | 100 HB | 99 % IACS |
Extra spring hard | Maximum-strength cold-drawn wire/strip; essentially no formability left. | 370 | 395 | 3 | 105 HB | 98 % IACS |
Supply forms, finishes and certifications
Ways Cu-OF is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
PWD | Powder Feedstock | Supply form |
DED | DED / Laser or Wire Deposition, as-deposited | Printing process |
LPBF-ABDefault | L-PBF As-Built | Printing process |
LPBF-ANN | L-PBF Annealed | Surface finish |
LPBF-HIP | L-PBF + HIP | Surface finish |
LPBF-SR | L-PBF Stress Relieved | Surface finish |
What is Cu-OF?
Cu-OF (C10200) is oxygen-free copper with oxygen held at 10 ppm or less, supplied as wrought bar, sheet and strip in O60 through H10 tempers and as gas-atomized powder for L-PBF, EB-PBF, binder jetting and DED. Engineers use it where electrical and thermal conductivity dominate, at 88 % IACS and 340 W/m·K on the reference condition, for induction coils, heat sinks and RF hardware. It is soft and low in strength — 150 MPa yield, 230 MPa tensile, 30 % elongation, 65 HB — with service to 200 °C and machinability near 20. High IR reflectivity complicates laser processing; use CuCrZr where strength is needed. Cu-OF has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,083°C (1,981 °F). Cu-OF has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 115 GPa (16.7 Msi).
What is Cu-OF used for?
- induction coils
- heat sinks
- electrical contacts
- waveguides
Advantages
- Tough — resists crack growth — 90 MPa·√m (81.9 ksi·√in), better than 96% of copper alloy grades
- Forms and bends easily — 95/100, better than 94% of copper alloy grades
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
- Conducts heat well — 340 W/m·K (196.4 BTU/hr·ft·°F), better than 86% of copper alloy grades
- High electrical conductivity — 88 % IACS, better than 86% of copper alloy grades
Limitations
- Difficult to machine — 20/100, worse than 98% of copper alloy grades
Cu-OF properties
Typical room-temperature values; bars are the position among copper alloy grades.
Physical3
Cu-OF has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,083°C (1,981 °F).
Mechanical13
Cu-OF has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 115 GPa (16.7 Msi).
Thermal6
Cu-OF is rated for continuous service to 200°C (392 °F). It conducts heat at 340 W/m·K (196.4 BTU/hr·ft·°F), better than 86% of copper alloy grades. Thermal expansion is 17.7 µm/m·K (9.83 µin/in·°F).
Electrical3
Cu-OF conducts electricity at 88 % IACS, better than 86% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of Cu-OF takes about 57 MJ of energy and emits 4 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 25%.
Manufacturability8
Cu-OF's machinability is poor (20/100, worse than 98% of copper alloy grades); weldability good (55/100); formability excellent (95/100).
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. Cu-OF is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Cu-OF
Is Cu-OF easy to machine?
Gummy and abrasive-free but built-up-edge prone: use sharp, polished, high-positive-rake carbide, high speed (200–400 m/min), heavy flood coolant and avoid dwelling; AM parts machine similarly to annealed bar.
Can Cu-OF be welded?
Best joined by EB, laser (green preferred) or GTAW/GMAW with 150–500 °C preheat because of the huge thermal conductivity; brazing and soldering are excellent, and no hydrogen embrittlement risk since O ≤10 ppm.
Can Cu-OF be formed, bent or molded?
Outstanding cold formability in the soft tempers (deep draw, spin, bend to 0T); anneal 400–600 °C in inert or reducing atmosphere between heavy reductions; L-PBF needs green/blue laser or high-power IR plus preheat to overcome reflectivity.
Cu-OF 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 |
|---|---|---|
| O≤10 ppm; AM powder typically 150–400 ppm total O after atomisation | ≤ 0 | 5×10⁻⁴ |
| PTU1 limit (GB/T 5231) | ≤ 3×10⁻⁴ | |
| BiTU1 limit | ≤ 0 | |
| PbTU1 limit | ≤ 0 | |
| STU1 limit | ≤ 0 | |
| CuCu + Ag, ASTM B170 Grade 2 / GB/T 5231 TU1 | ≥ 99.95 (balance) |
What surface finishes work on Cu-OF?
Not anodisable — electropolish or bead-blast then plate (Ni barrier + Ag/Au for RF), or protect with benzotriazole/clear lacquer; AM surfaces normally need chemical/abrasive polishing to reach low RF loss.
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 Cu-OF in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does Cu-OF cost?
Cu-OF 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.
Cu-OF — frequently asked
What is Cu-OF used for?
Cu-OF is typically used for induction coils, heat sinks, electrical contacts and waveguides. In short: highest-conductivity AM copper; oxygen-free, embrittlement-free; soft with low machinability.
What is the yield strength of Cu-OF?
Cu-OF has a typical yield strength of 150 MPa (21.8 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 69% of copper alloy grades. Strength varies by condition: see the 14 listed tempers.
Is Cu-OF easy to machine?
Not especially — machinability is rated poor (20/100, worse than 98% of copper alloy grades). Gummy and abrasive-free but built-up-edge prone: use sharp, polished, high-positive-rake carbide, high speed (200–400 m/min), heavy flood coolant and avoid dwelling; AM parts machine similarly to annealed bar.
Can Cu-OF be welded?
Yes — weldability is rated good (55/100). Best joined by EB, laser (green preferred) or GTAW/GMAW with 150–500 °C preheat because of the huge thermal conductivity; brazing and soldering are excellent, and no hydrogen embrittlement risk since O ≤10 ppm.
What surface finishes work on Cu-OF?
Not anodisable — electropolish or bead-blast then plate (Ni barrier + Ag/Au for RF), or protect with benzotriazole/clear lacquer; AM surfaces normally need chemical/abrasive polishing to reach low RF loss.
Can Cu-OF be formed, bent or molded?
Outstanding cold formability in the soft tempers (deep draw, spin, bend to 0T); anneal 400–600 °C in inert or reducing atmosphere between heavy reductions; L-PBF needs green/blue laser or high-power IR plus preheat to overcome reflectivity.
What is the maximum service temperature of Cu-OF?
Cu-OF 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.
How much does Cu-OF cost?
Cu-OF 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 B170 — Oxygen-Free Electrolytic Copper Refinery Shapes — ASTM International (2019)
- CDA Alloy Datasheet C10200 (OF Copper) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Gas-atomised pure copper (Cu-OF) AM powder datasheets — AM powder producers (SLM/EOS/Trumpf/Sandvik-class data) (2024)
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.