Copper Alloy CuAg0.07-H04
Supply condition · default condition
EN CuAg0.07
H04 = full hard
Standard stocked condition for silver copper rod and bar: highest practical strength retained at 250–300 °C with near-full conductivity.
Values for the H04 condition
Other CuAg0.07 tempers and conditions
CuAg0.07 is listed in 8 conditions; see the grade overview at CuAg0.07.
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 |
H04DefaultThis page 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-H04?
CuAg0.07-H04 is CuAg0.07 supplied in the H04 condition — standard stocked condition for silver copper rod and bar: highest practical strength retained at 250–300 °C with near-full conductivity. CuAg0.07-H04 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). CuAg0.07-H04 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).
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-H04 properties
Typical room-temperature values for CuAg0.07-H04; 14 are specific to this condition. Other listed values are CuAg0.07 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CuAg0.07-H04 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-H04 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-H04 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-H04 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-H04 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-H04'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. Confirm any required mill or lot documentation when quoting.
Working with CuAg0.07-H04
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.
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.
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 | — |
CuAg0.07-H04 — frequently asked
What is CuAg0.07-H04 used for?
CuAg0.07-H04 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-H04?
CuAg0.07-H04 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-H04 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-H04 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-H04?
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-H04 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-H04?
CuAg0.07-H04 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.