Copper Alloy C77600-H04
Supply condition
UNS C77600
H04 = full hard
Pick for flat stamped parts, screws and fittings needing higher strength with only gentle bends.
Values for the H04 condition
Other C77600 tempers and conditions
C77600 is listed in 8 conditions; see the grade overview at C77600.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for deep drawing, spinning and severe forming of hardware and instrument parts. | 170 | 400 | 40 | 90 HB | 5.8 % IACS |
Quarter hard | Pick when moderate bending or forming is still needed but annealed strength is too low. | 380 | 480 | 20 | 127 HB | 5.6 % IACS |
H02Default Half hard | Default stock condition — best balance of strength, bendability and surface finish for hardware and fittings. | 470 | 550 | 10 | 150 HB | 5.5 % IACS |
Drawn and stress-relieved | Pick for cold-worked parts that must resist stress-corrosion cracking in ammonia-bearing or humid service. | 480 | 560 | 10 | 155 HB | 5.5 % IACS |
H04This page Full hard | Pick for flat stamped parts, screws and fittings needing higher strength with only gentle bends. | 550 | 620 | 5 | 10 HRC | 5.4 % IACS |
Extra hard | Pick for flat springs and contacts where high strength matters more than formability. | 610 | 690 | 3 | 14 HRC | 5.3 % IACS |
Spring hard | Pick for spring washers, clips and elastic contact members made by simple forming. | 660 | 740 | 2 | 17 HRC | 5.3 % IACS |
Extra spring hard | Pick for the highest strength flat springs in thin strip; forming limited to very large bend radii. | 700 | 780 | 2 | 20 HRC | 5.2 % IACS |
What is C77600-H04?
C77600-H04 is C77600 supplied in the H04 condition — pick for flat stamped parts, screws and fittings needing higher strength with only gentle bends. C77600-H04 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 92% of copper alloy grades. Elongation at break is 5% and the elastic modulus is 125 GPa (18.1 Msi). C77600-H04 has a density of 8.7 g/cm³ (0.314 lb/in³), lighter than 56% of copper alloy grades. It melts at 1,030°C (1,886 °F). H02 is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 88/100, better than 97% of copper alloy grades
- High strength — 550 MPa (79.8 ksi), better than 92% of copper alloy grades
Limitations
- Low electrical conductivity — 5.4 % IACS, worse than 95% of copper alloy grades
- Limited ductility — 5%, worse than 93% of copper alloy grades
- Poor heat conductor — 29 W/m·K (16.8 BTU/hr·ft·°F), worse than 93% of copper alloy grades
- Limited service temperature — 175°C (347 °F), worse than 92% of copper alloy grades
- High embodied carbon — 4.5 kg CO₂/kg, worse than 79% of copper alloy grades
C77600-H04 properties
Typical room-temperature values for C77600-H04; 21 are specific to this condition. Other listed values are C77600 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C77600-H04 has a density of 8.7 g/cm³ (0.314 lb/in³), lighter than 56% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical14
C77600-H04 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 92% of copper alloy grades. Elongation at break is 5% and the elastic modulus is 125 GPa (18.1 Msi).
Thermal6
C77600-H04 is rated for continuous service to 175°C (347 °F). It conducts heat at 29 W/m·K (16.8 BTU/hr·ft·°F), worse than 93% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C77600-H04 conducts electricity at 5.4 % IACS, worse than 95% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C77600-H04 takes about 62 MJ of energy and emits 4.5 kg of CO₂ — more than 76% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C77600-H04's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability fair (50/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C77600-H04
Is C77600 easy to machine?
Unleaded and gummy — use sharp positive-rake carbide, high speed, generous coolant and chip-breaking geometry; rating ≈20 % of free-cutting brass.
Can C77600 be welded?
Braze and soft-solder readily with silver filler; resistance welding is fair, fusion welding needs zinc-fume extraction and low heat input to avoid dezincification and porosity.
Can C77600 be formed, bent or molded?
Excellent deep-drawing and stamping in O60/H01; interstage anneal at 600–750 °C, and stress-relieve at 260–300 °C after heavy cold work to prevent SCC.
What surface finishes work on C77600?
Polishes to a bright silver-white finish; commonly buffed, lacquered, or nickel/chrome/silver plated — anodizing does not apply.
C77600 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 |
|---|---|---|
| Cuincludes Ag by convention | 55 – 58 | 56.5 |
| NiNi + Co | 12.5 – 15.5 | 14 |
| Mn | ≤ 0.5 | 0.15 |
| Fe | ≤ 0.25 | — |
| Pbunleaded grade | ≤ 0.05 | — |
| Zn | balance | — |
C77600-H04 — frequently asked
What is C77600-H04 used for?
C77600-H04 is typically used for musical instrument hardware, decorative fittings and electrical parts. In short: general-purpose nickel silver; bright silver-white surface; balanced strength and forming.
What is the yield strength of C77600-H04?
C77600-H04 has a typical yield strength of 550 MPa (79.8 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 92% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C77600-H04 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Unleaded and gummy — use sharp positive-rake carbide, high speed, generous coolant and chip-breaking geometry; rating ≈20 % of free-cutting brass.
Can C77600-H04 be welded?
With care — weldability is rated fair (50/100). Braze and soft-solder readily with silver filler; resistance welding is fair, fusion welding needs zinc-fume extraction and low heat input to avoid dezincification and porosity.
What surface finishes work on C77600-H04?
Polishes to a bright silver-white finish; commonly buffed, lacquered, or nickel/chrome/silver plated — anodizing does not apply.
Can C77600-H04 be formed, bent or molded?
Excellent deep-drawing and stamping in O60/H01; interstage anneal at 600–750 °C, and stress-relieve at 260–300 °C after heavy cold work to prevent SCC.
What is the maximum service temperature of C77600-H04?
C77600-H04 is rated for continuous use to about 175°C (347 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C77600-H02 and C77600-O60?
H02 is the default condition — default stock condition — best balance of strength, bendability and surface finish for hardware and fittings. O60: pick for deep drawing, spinning and severe forming of hardware and instrument parts. Yield strength is 470 MPa in H02 versus 170 MPa in O60.
Sources
- CDA UNS Standard Designations for Wrought Copper Alloys — C77600 nickel silver — Copper Development Association (2023)
- ASTM B122/B122M — Copper-Nickel-Tin, Copper-Nickel-Zinc Plate, Sheet, Strip and Rolled Bar — ASTM International (2022)
- ASTM B151/B151M — Copper-Nickel-Zinc (Nickel Silver) and Copper-Nickel Rod and Bar — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: 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.