Copper Alloy CuAg0.07P-R250
Temper
EN CuAg0.07P
R250 = cold worked, Rm ≥ 250 MPa
Standard drawn rod/profile temper for machined contact and commutator parts.
Values for the R250 condition
Other CuAg0.07P tempers and conditions
CuAg0.07P is listed in 8 conditions; see the grade overview at CuAg0.07P.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
R200Default Annealed (soft), Rm ≥ 200 MPa | Fully annealed condition for deep drawing, bending and forming of conductor parts before final brazing. | 70 | 225 | 45 | 45 HB | 98 % IACS |
Thermomechanically controlled processed | Hot-worked mill product supplied without guaranteed mechanical values; used as feedstock for further drawing or forging. | 70 | 210 | 40 | 43 HB | 98 % IACS |
Light cold work (quarter hard), Rm ≥ 220 MPa | Lightly drawn/rolled strip and rod where mild stiffening is needed but bending is still required. | 150 | 240 | 30 | 62 HB | 97 % IACS |
Half hard, Rm ≥ 240 MPa | General-purpose semi-hard bar and strip for busbars and commutator segments that are still bent on assembly. | 200 | 265 | 15 | 76 HB | 97 % IACS |
R250This page Cold worked, Rm ≥ 250 MPa | Standard drawn rod/profile temper for machined contact and commutator parts. | 230 | 275 | 10 | 85 HB | 96.5 % IACS |
Hard, Rm ≥ 290 MPa | Hard strip/rod for commutator segments and springy contacts that must survive brazing without softening. | 280 | 320 | 5 | 95 HB | 96 % IACS |
Extra hard, Rm ≥ 300 MPa | Heavily drawn temper where maximum as-brazed strength and creep resistance are needed. | 300 | 330 | 4 | 102 HB | 96 % IACS |
Hard drawn wire/rod, Rm ≥ 360 MPa | Hard-drawn wire and small rod for windings, trolley wire and welding-machine conductors requiring softening resistance. | 350 | 385 | 2.5 | 112 HB | 95.5 % IACS |
What is CuAg0.07P-R250?
CuAg0.07P-R250 is CuAg0.07P in the R250 temper — standard drawn rod/profile temper for machined contact and commutator parts. CuAg0.07P-R250 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 51% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 122 GPa (17.7 Msi). CuAg0.07P-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). R200 is the default condition FabDigit quotes; R250 is available on request or by drawing note.
Advantages
- Conducts heat well — 372 W/m·K (214.9 BTU/hr·ft·°F), better than 91% of copper alloy grades
- High electrical conductivity — 96.5 % IACS, better than 91% of copper alloy grades
- Readily welded — 68/100, better than 82% of copper alloy grades
Limitations
- Limited ductility — 10%, worse than 76% of copper alloy grades
CuAg0.07P-R250 properties
Typical room-temperature values for CuAg0.07P-R250; 20 are specific to this condition. Other listed values are CuAg0.07P reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CuAg0.07P-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).
Mechanical13
CuAg0.07P-R250 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 51% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 122 GPa (17.7 Msi).
Thermal6
CuAg0.07P-R250 is rated for continuous service to 250°C (482 °F). It conducts heat at 372 W/m·K (214.9 BTU/hr·ft·°F), better than 91% of copper alloy grades. Thermal expansion is 17.7 µm/m·K (9.83 µin/in·°F).
Electrical3
CuAg0.07P-R250 conducts electricity at 96.5 % IACS, better than 91% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of CuAg0.07P-R250 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%.
Manufacturability7
CuAg0.07P-R250's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability good (68/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CuAg0.07P-R250
Is CuAg0.07P easy to machine?
Gummy like pure copper (≈20 % of AISI 1212) — use sharp positive-rake tools, high speed, generous soluble-oil coolant; cold-worked tempers cut noticeably cleaner than annealed.
Can CuAg0.07P be welded?
Readily TIG/MIG/resistance welded and phosphorus-deoxidised so it is immune to hydrogen embrittlement; preheat thick sections (high thermal conductivity) and expect local annealing to R200 in the HAZ.
Can CuAg0.07P be formed, bent or molded?
Excellent cold formability in R200 — deep drawing, coining and tight bends; interanneal at 400–600 °C, but note the silver raises the required anneal temperature versus plain Cu.
What surface finishes work on CuAg0.07P?
Not anodisable; solders and brazes very easily, takes bright tin, silver or nickel plating, and polishes to a high lustre — protect with lacquer or benzotriazole to prevent tarnish.
CuAg0.07P 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 raises the softening/recrystallisation temperature | 0.06 – 0.08 | 0.07 |
| Plow-P deoxidation; keeps conductivity high while removing oxygen | 0 – 0.01 | 0.01 |
| Biimpurity limit | ≤ 5×10⁻⁴ | — |
| Pbimpurity limit | ≤ 0.01 | — |
| CuCu + Ag ≥ 99.90 %, remainder impurities per EN 1976/EN 13601 | ≥ 99.9 (balance) | — |
CuAg0.07P-R250 — frequently asked
What is CuAg0.07P-R250 used for?
CuAg0.07P-R250 is typically used for brazed busbar joints, heat exchanger tubing and welded electrical hardware. In short: silver-bearing deoxidized copper; resists brazing-cycle softening; 98 % IACS conductor grade.
What is the yield strength of CuAg0.07P-R250?
CuAg0.07P-R250 has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 51% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is CuAg0.07P-R250 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Gummy like pure copper (≈20 % of AISI 1212) — use sharp positive-rake tools, high speed, generous soluble-oil coolant; cold-worked tempers cut noticeably cleaner than annealed.
Can CuAg0.07P-R250 be welded?
Yes — weldability is rated good (68/100). Readily TIG/MIG/resistance welded and phosphorus-deoxidised so it is immune to hydrogen embrittlement; preheat thick sections (high thermal conductivity) and expect local annealing to R200 in the HAZ.
What surface finishes work on CuAg0.07P-R250?
Not anodisable; solders and brazes very easily, takes bright tin, silver or nickel plating, and polishes to a high lustre — protect with lacquer or benzotriazole to prevent tarnish.
Can CuAg0.07P-R250 be formed, bent or molded?
Excellent cold formability in R200 — deep drawing, coining and tight bends; interanneal at 400–600 °C, but note the silver raises the required anneal temperature versus plain Cu.
What is the maximum service temperature of CuAg0.07P-R250?
CuAg0.07P-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 CuAg0.07P-R200 and CuAg0.07P-R360?
R200 is the default condition — fully annealed condition for deep drawing, bending and forming of conductor parts before final brazing. R360: hard-drawn wire and small rod for windings, trolley wire and welding-machine conductors requiring softening resistance. Yield strength is 70 MPa in R200 versus 350 MPa in R360.
Sources
- EN 1976 — Copper and copper alloys: cast unwrought copper products (material designations CW014A–CW016A) — CEN (2012)
- EN 13601 — Copper rod, bar and wire for general electrical purposes (tempers R200–R360) — CEN (2021)
- EN 1652 / EN 13599 — Copper plate, sheet and strip for electrical purposes — CEN (2014)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- CDA alloy datasheets, silver-bearing coppers (C10400–C10700 analogues) — Copper Development Association (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.