Copper Alloy CuAg0.10-R250
Temper · default condition
EN CuAg0.10 · UNS C11300
R250 = cold drawn, Rm ≥ 250 MPa
Most commonly stocked drawn condition for commutator bars, busbar and machined conductive parts.
Values for the R250 condition
Other CuAg0.10 tempers and conditions
CuAg0.10 is listed in 9 conditions; see the grade overview at CuAg0.10.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed / soft, Rm ≥ 200 MPa | Choose for maximum ductility and conductivity: deep drawing, bending, riveting, coil winding. | 65 | 220 | 45 | 45 HB | 101 % IACS |
Thermomechanically controlled processed | Cheapest mill condition for bus bar and forging stock where properties are set by later working or annealing. | 70 | 215 | 40 | 45 HB | 101 % IACS |
Lightly drawn, Rm ≥ 220 MPa | Light draw for straightness and better surface while keeping high elongation for bending. | 130 | 235 | 33 | 59 HB | 100 % IACS |
Cold drawn half hard, Rm ≥ 240 MPa | General-purpose drawn rod/bar balance of strength, bendability and conductivity. | 180 | 260 | 20 | 71 HB | 100 % IACS |
R250DefaultThis page Cold drawn, Rm ≥ 250 MPa | Most commonly stocked drawn condition for commutator bars, busbar and machined conductive parts. | 200 | 275 | 15 | 76 HB | 100 % IACS |
Cold drawn hard, Rm ≥ 280 MPa | Higher-strength drawn bar for commutator segments and contact carriers that see brazing heat. | 250 | 300 | 10 | 87 HB | 99 % IACS |
Cold drawn hard, Rm ≥ 300 MPa | Hard drawn bar/profile where creep and softening resistance after soldering are critical. | 280 | 320 | 8 | 95 HB | 99 % IACS |
Extra hard drawn, Rm ≥ 320 MPa | Small-section drawn rod/wire needing maximum strength with full conductivity. | 305 | 345 | 5 | 103 HB | 98 % IACS |
Hard drawn wire, Rm ≥ 360 MPa | Hard-drawn silver-copper wire for high-temperature magnet windings and overhead/trolley conductors. | 340 | 385 | 2.5 | 110 HB | 98 % IACS |
What is CuAg0.10-R250?
CuAg0.10-R250 is CuAg0.10 in the R250 temper — most commonly stocked drawn condition for commutator bars, busbar and machined conductive parts. CuAg0.10-R250 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 54% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 122 GPa (17.7 Msi). CuAg0.10-R250 has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,065°C (1,949 °F).
Advantages
- High electrical conductivity — 100 % IACS, better than 96% of copper alloy grades
- Conducts heat well — 388 W/m·K (224.2 BTU/hr·ft·°F), better than 95% of copper alloy grades
- Forms and bends easily — 70/100, better than 80% of copper alloy grades
Limitations
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
CuAg0.10-R250 properties
Typical room-temperature values for CuAg0.10-R250; 20 are specific to this condition. Other listed values are CuAg0.10 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CuAg0.10-R250 has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,065°C (1,949 °F).
Mechanical14
CuAg0.10-R250 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 54% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 122 GPa (17.7 Msi).
Thermal6
CuAg0.10-R250 is rated for continuous service to 250°C (482 °F). It conducts heat at 388 W/m·K (224.2 BTU/hr·ft·°F), better than 95% of copper alloy grades. Thermal expansion is 17.7 µm/m·K (9.83 µin/in·°F).
Electrical3
CuAg0.10-R250 conducts electricity at 100 % IACS, better than 96% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of CuAg0.10-R250 takes about 58 MJ of energy and emits 3.8 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
CuAg0.10-R250's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability fair (40/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CuAg0.10-R250
Is CuAg0.10 easy to machine?
Gummy and low-rated (~20 % of AISI 1212): use sharp positive-rake tools, high speed, generous soluble-oil coolant and avoid dwell; drawn tempers machine better than annealed.
Can CuAg0.10 be welded?
Tough-pitch grade — prefer resistance, brazing or soldering; TIG/MIG needs high heat input and produces oxide/hydrogen embrittlement risk, so use deoxidised filler and avoid reducing atmospheres above ~400 °C.
Can CuAg0.10 be formed, bent or molded?
Excellent cold formability in R200/R220 (bending, deep drawing, upsetting); interanneal 400–500 °C for heavy reductions, hot working 750–950 °C.
What surface finishes work on CuAg0.10?
Not anodisable; tin, silver or nickel electroplating is standard for contacts, otherwise mechanical polish plus benzotriazole/lacquer to limit tarnish.
CuAg0.10 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 |
|---|---|---|
| Agsilver addition raises softening/recrystallisation temperature | 0.08 – 0.12 | 0.1 |
| Otough-pitch (oxygen-containing); OF variant is CR014A | ≤ 0.04 | 0.03 |
| Pkept low to preserve conductivity | ≤ 0 | — |
| Bi | ≤ 5×10⁻⁴ | — |
| Pb | ≤ 0.01 | — |
| CuCu + Ag ≥ 99.90 % (excluding oxygen) | balance | — |
CuAg0.10-R250 — frequently asked
What is CuAg0.10-R250 used for?
CuAg0.10-R250 is typically used for overhead contact wire, high-temperature commutator segments and resistance welding electrodes. In short: most softening-resistant CuAg grade; 100 % IACS conductivity; drawn R200–R360 tempers.
What is the yield strength of CuAg0.10-R250?
CuAg0.10-R250 has a typical yield strength of 200 MPa (29 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 54% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is CuAg0.10-R250 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Gummy and low-rated (~20 % of AISI 1212): use sharp positive-rake tools, high speed, generous soluble-oil coolant and avoid dwell; drawn tempers machine better than annealed.
Can CuAg0.10-R250 be welded?
With care — weldability is rated fair (40/100). Tough-pitch grade — prefer resistance, brazing or soldering; TIG/MIG needs high heat input and produces oxide/hydrogen embrittlement risk, so use deoxidised filler and avoid reducing atmospheres above ~400 °C.
What surface finishes work on CuAg0.10-R250?
Not anodisable; tin, silver or nickel electroplating is standard for contacts, otherwise mechanical polish plus benzotriazole/lacquer to limit tarnish.
Can CuAg0.10-R250 be formed, bent or molded?
Excellent cold formability in R200/R220 (bending, deep drawing, upsetting); interanneal 400–500 °C for heavy reductions, hot working 750–950 °C.
What is the maximum service temperature of CuAg0.10-R250?
CuAg0.10-R250 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 CuAg0.10-R250 and CuAg0.10-R360?
R250 is the default condition — most commonly stocked drawn condition for commutator bars, busbar and machined conductive parts. R360: hard-drawn silver-copper wire for high-temperature magnet windings and overhead/trolley conductors. Yield strength is 200 MPa in R250 versus 340 MPa in R360.
Sources
- EN 1977 — Copper and copper alloys: copper drawing stock (wire rod) — CEN (2013)
- EN 13601 — Copper rod, bar and wire for general electrical purposes — CEN (2021)
- EN 13602 — Drawn round copper wire for electrical conductors — CEN (2013)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- CDA alloy data, C11600 silver-bearing tough pitch copper — Copper Development Association (2023)
- DKI Informationsdruck — Niedriglegierte Kupferwerkstoffe (silver coppers) — Deutsches Kupferinstitut (2019)
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.