Copper Alloy CuAg0.04P-R250
Temper
EN CuAg0.04P
R250 = drawn, medium hard
Intermediate step between half hard and hard for rod requiring higher proof stress.
Values for the R250 condition
Other CuAg0.04P tempers and conditions
CuAg0.04P is listed in 8 conditions; see the grade overview at CuAg0.04P.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As cast | Feedstock condition for rolling/extrusion mills; not a structural condition. | 55 | 160 | 35 | 42 HB | 95 % IACS |
Annealed / soft | Choose for maximum conductivity and deep forming/bending of rod, tube and profile. | 70 | 220 | 45 | 45 HB | 96 % IACS |
Thermomechanically controlled processed | Mill-standard supply when the customer will anneal or draw the material himself. | 100 | 220 | 35 | 57 HB | 95 % IACS |
Lightly drawn / quarter hard | Slight cold work for straightness and improved surface while keeping high ductility. | 150 | 240 | 28 | 68 HB | 95 % IACS |
R240Default Half hard, cold drawn | The usual stock condition for conductor rod, commutator and busbar machining — good strength with workable ductility. | 200 | 265 | 18 | 85 HB | 94 % IACS |
R250This page Drawn, medium hard | Intermediate step between half hard and hard for rod requiring higher proof stress. | 220 | 275 | 12 | 90 HB | 94 % IACS |
Hard drawn | Pick where the part must resist creep/softening in service, e.g. commutator segments and hard-drawn conductors. | 270 | 310 | 8 | 100 HB | 93 % IACS |
Extra hard drawn | Maximum cold-worked strength for small-section rod and wire; very low ductility. | 300 | 330 | 5 | 108 HB | 92 % IACS |
What is CuAg0.04P-R250?
CuAg0.04P-R250 is CuAg0.04P in the R250 temper — intermediate step between half hard and hard for rod requiring higher proof stress. CuAg0.04P-R250 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 51% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 120 GPa (17.4 Msi). CuAg0.04P-R250 has a density of 8.93 g/cm³ (0.323 lb/in³), heavier than 82% of copper alloy grades. It melts at 1,065°C (1,949 °F). R240 is the default condition FabDigit quotes; R250 is available on request or by drawing note.
Advantages
- Readily welded — 85/100, better than 95% of copper alloy grades
- Conducts heat well — 358 W/m·K (206.8 BTU/hr·ft·°F), better than 90% of copper alloy grades
- High electrical conductivity — 94 % IACS, better than 90% of copper alloy grades
CuAg0.04P-R250 properties
Typical room-temperature values for CuAg0.04P-R250; 20 are specific to this condition. Other listed values are CuAg0.04P reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CuAg0.04P-R250 has a density of 8.93 g/cm³ (0.323 lb/in³), heavier than 82% of copper alloy grades. It melts at 1,065°C (1,949 °F).
Mechanical13
CuAg0.04P-R250 has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 51% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
CuAg0.04P-R250 is rated for continuous service to 230°C (446 °F). It conducts heat at 358 W/m·K (206.8 BTU/hr·ft·°F), better than 90% of copper alloy grades. Thermal expansion is 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
CuAg0.04P-R250 conducts electricity at 94 % IACS, better than 90% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 69% of copper alloy grades.
Sustainability4
Producing a kilogram of CuAg0.04P-R250 takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
CuAg0.04P-R250's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability excellent (85/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CuAg0.04P-R250
Is CuAg0.04P easy to machine?
Gummy like pure copper — use sharp positive-rake tools, high speed, low feed and generous flood coolant; expect ~20 % of AISI 1212, best results in R240/R290 temper.
Can CuAg0.04P be welded?
Excellent for TIG/MIG, resistance and oxy-fuel welding — phosphorus deoxidation removes hydrogen-embrittlement risk; preheat 150–400 °C on heavy sections because of high heat conduction.
Can CuAg0.04P be formed, bent or molded?
Cold heads, bends and swages readily in R200/R220; interstage anneal 400–600 °C, and note the silver raises the recrystallisation temperature ~100 °C above plain copper.
What surface finishes work on CuAg0.04P?
Not anodisable; tin, silver or nickel plate for contacts, or polish/lacquer — bare surfaces oxidise and tarnish quickly.
CuAg0.04P 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 counted in the copper content; raises softening temperature | 0.03 – 0.05 | 0.04 |
| Pdeoxidiser; low-P range keeps conductivity high | 0 – 0.01 | 0.01 |
| Biimpurity limit | ≤ 5×10⁻⁴ | — |
| Pbimpurity limit | ≤ 0.01 | — |
| CuCu + Ag ≥ 99.90 % | ≥ 99.9 (balance) | — |
CuAg0.04P-R250 — frequently asked
What is CuAg0.04P-R250 used for?
CuAg0.04P-R250 is typically used for brazed electrical assemblies, heat exchanger tube stock and welded conductor components. In short: weldable silver-bearing copper; no hydrogen embrittlement risk; 94 % IACS with 250 °C service.
What is the yield strength of CuAg0.04P-R250?
CuAg0.04P-R250 has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 51% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is CuAg0.04P-R250 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Gummy like pure copper — use sharp positive-rake tools, high speed, low feed and generous flood coolant; expect ~20 % of AISI 1212, best results in R240/R290 temper.
Can CuAg0.04P-R250 be welded?
Yes — weldability is rated excellent (85/100). Excellent for TIG/MIG, resistance and oxy-fuel welding — phosphorus deoxidation removes hydrogen-embrittlement risk; preheat 150–400 °C on heavy sections because of high heat conduction.
What surface finishes work on CuAg0.04P-R250?
Not anodisable; tin, silver or nickel plate for contacts, or polish/lacquer — bare surfaces oxidise and tarnish quickly.
Can CuAg0.04P-R250 be formed, bent or molded?
Cold heads, bends and swages readily in R200/R220; interstage anneal 400–600 °C, and note the silver raises the recrystallisation temperature ~100 °C above plain copper.
What is the maximum service temperature of CuAg0.04P-R250?
CuAg0.04P-R250 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 CuAg0.04P-R240 and CuAg0.04P Cast?
R240 is the default condition — the usual stock condition for conductor rod, commutator and busbar machining — good strength with workable ductility. Cast: feedstock condition for rolling/extrusion mills; not a structural condition. Yield strength is 200 MPa in R240 versus 55 MPa in Cast.
Sources
- EN 1976 — Copper and copper alloys: cast unwrought copper products (CR014A) — CEN (2012)
- EN 13601 — Copper rod, bar and wire for general electrical purposes — CEN (2021)
- EN 1412 — Copper and copper alloys: European numbering system — CEN (2016)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- CDA / copper.org alloy property data for deoxidised and silver-bearing coppers — Copper Development Association (2023)
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.