Copper Alloy CuAg0.07
EN CuAg0.07
CuAg0.07 (CR012A) is a tough-pitch copper with a higher silver content than CuAg0.04, giving further improvement in resistance to softening during elevated-temperature electrical service while retaining 97 % IACS conductivity and 388 W/m·K thermal conductivity.
Reference datasheet — CuAg0.07 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.
Values for the H04 condition
CuAg0.07 tempers and conditions
CuAg0.07 is supplied in 8 conditions, soft to hard. H04 is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for maximum ductility and conductivity — deep drawing, bending, riveted or formed conductors and gaskets. | 70 | 220 | 48 | 42 HB | 101 % IACS |
Thermomechanically controlled processed | Mill-finish hot-worked rod or bar bought for subsequent drawing, forging or machining rather than for guaranteed strength. | 90 | 235 | 40 | 48 HB | 100 % IACS |
H00 / R220 | Light cold work for slightly stiffer strip/rod that still bends freely; used for formed busbar links. | 180 | 250 | 32 | 60 HB | 100 % IACS |
Quarter hard | Balanced strength/formability temper for stamped contacts and commutator segments that need moderate bending. | 215 | 275 | 25 | 70 HB | 99 % IACS |
Half hard | Most common strip/plate temper for machined commutator rings and heavy contact parts needing stiffness with some bendability. | 250 | 300 | 16 | 85 HB | 98 % IACS |
H04Default Full hard | Standard stocked condition for silver copper rod and bar: highest practical strength retained at 250–300 °C with near-full conductivity. | 310 | 350 | 9 | 100 HB | 97 % IACS |
Spring hard | Heavily drawn wire and thin rod for rotor bars, coil conductors and welding-machine leads where tensile strength plus anti-softening is critical. | 360 | 400 | 4 | 112 HB | 96 % IACS |
Spring temper strip/wire | Maximum cold-worked strength for springy current-carrying clips and brush holders; almost no formability left. | 390 | 420 | 2 | 122 HB | 95 % IACS |
What is CuAg0.07?
CuAg0.07 (CR012A) is a tough-pitch copper with a higher silver content than CuAg0.04, giving further improvement in resistance to softening during elevated-temperature electrical service while retaining 97 % IACS conductivity and 388 W/m·K thermal conductivity. It is used as rod, wire and profile for parts that see heat or brazing cycles, with 350 MPa tensile, 310 MPa yield, 9 % elongation and 100 HB in the default temper and service to 300 °C. It is gummy to machine, and the tough-pitch base can embrittle in hydrogen-bearing flames, so the oxygen-free or phosphorus-deoxidised grades are preferred where fusion welding dominates. CuAg0.07 has a density of 8.91 g/cm³ (0.322 lb/in³), heavier than 80% of copper alloy grades. It melts at 1,065°C (1,949 °F). CuAg0.07 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 350 MPa (50.8 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 9% and the elastic modulus is 120 GPa (17.4 Msi).
What is CuAg0.07 used for?
- commutators
- motor windings exposed to heat
- railway contact wire
Advantages
- Conducts heat well — 388 W/m·K (224.2 BTU/hr·ft·°F), better than 95% of copper alloy grades
- High electrical conductivity — 97 % IACS, better than 92% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
Limitations
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
- Limited ductility — 9%, worse than 79% of copper alloy grades
CuAg0.07 properties
Typical room-temperature values for CuAg0.07-H04; bars are the position among copper alloy grades.
Physical3
CuAg0.07 has a density of 8.91 g/cm³ (0.322 lb/in³), heavier than 80% of copper alloy grades. It melts at 1,065°C (1,949 °F).
Mechanical14
CuAg0.07 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 350 MPa (50.8 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 9% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
CuAg0.07 is rated for continuous service to 300°C (572 °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
CuAg0.07 conducts electricity at 97 % IACS, better than 92% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of CuAg0.07 takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 20%.
Manufacturability8
CuAg0.07's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability fair (45/100); formability fair (45/100).
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. CuAg0.07 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CuAg0.07
Is CuAg0.07 easy to machine?
Gummy and low-rated (~20 % of AISI 1212): use sharp positive-rake tools, high speed, generous soluble-oil flood and avoid dwelling to prevent smearing.
Can CuAg0.07 be welded?
Resistance and TIG/MIG welding need high heat input and preheat because of 390 W/m·K conductivity; the tough-pitch base can embrittle in hydrogen-bearing flames, so prefer the oxygen-free variant for fusion welding.
Can CuAg0.07 be formed, bent or molded?
Excellent cold formability in O60; hard tempers should be bent with generous radii or interstage-annealed, and the silver keeps strength after brazing/soldering cycles up to ~300 °C.
CuAg0.07 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 raising softening temperature; counted with Cu for purity | 0.06 – 0.08 | 0.07 |
| Otough-pitch base; oxygen-free version supplied on request | 0.01 – 0.04 | 0.02 |
| Bi | ≤ 5×10⁻⁴ | |
| Pb | ≤ 0.01 | |
| CuCu + Ag ≥ 99.90 % | balance |
What surface finishes work on CuAg0.07?
Not anodizable — solder, silver-, tin- or nickel-plate for contacts; mechanically polishes to a bright finish but tarnishes without lacquer or passivation.
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 CuAg0.07 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CR012A
How much does CuAg0.07 cost?
CuAg0.07 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.
CuAg0.07 — frequently asked
What is CuAg0.07 used for?
CuAg0.07 is typically used for commutators, motor windings exposed to heat and railway contact wire. In short: higher-silver softening resistance; 97 % IACS with 300 °C service; holds strength after brazing.
What is the yield strength of CuAg0.07?
CuAg0.07 has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 350 MPa (50.8 ksi) — stronger than 64% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is CuAg0.07 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 flood and avoid dwelling to prevent smearing.
Can CuAg0.07 be welded?
With care — weldability is rated fair (45/100). Resistance and TIG/MIG welding need high heat input and preheat because of 390 W/m·K conductivity; the tough-pitch base can embrittle in hydrogen-bearing flames, so prefer the oxygen-free variant for fusion welding.
What surface finishes work on CuAg0.07?
Not anodizable — solder, silver-, tin- or nickel-plate for contacts; mechanically polishes to a bright finish but tarnishes without lacquer or passivation.
Can CuAg0.07 be formed, bent or molded?
Excellent cold formability in O60; hard tempers should be bent with generous radii or interstage-annealed, and the silver keeps strength after brazing/soldering cycles up to ~300 °C.
What is the maximum service temperature of CuAg0.07?
CuAg0.07 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CuAg0.07-H04 and CuAg0.07-O60?
H04 is the default condition — standard stocked condition for silver copper rod and bar: highest practical strength retained at 250–300 °C with near-full conductivity. O60: choose for maximum ductility and conductivity — deep drawing, bending, riveted or formed conductors and gaskets. Yield strength is 310 MPa in H04 versus 70 MPa in O60.
How much does CuAg0.07 cost?
CuAg0.07 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
- EN 13601 — Copper and copper alloys: rod, bar and wire for electrical purposes — CEN (2021)
- EN 1652 / EN 1978 designation system CW/CR012A silver copper — CEN (2019)
- Alloy datasheet C10700 (silver-bearing copper) — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys — ASM International (1990)
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.