Copper Alloy C77000
UNS C77000 · EN CW410J
C77000 is the strongest common unleaded wrought nickel silver (UNS C77000 / CW410J), combining high nickel with elevated zinc in the C70000-C79999 copper-nickel-zinc family and hardened by cold rolling from OS035 to H10.
Reference datasheet — C77000 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 H02 condition
C77000 tempers and conditions
C77000 is supplied in 8 conditions, soft to hard. H02 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 |
|---|---|---|---|---|---|---|
Annealed to 0.035 mm grain size | Softest commercial condition for deep drawing, spinning and severe forming before final work-hardening. | 186 | 414 | 40 | 100 HB | 5.7 % IACS |
As hot rolled | Hot-rolled plate/bar stock for subsequent machining or forming where temper is not critical. | 205 | 435 | 35 | 62 HRB | — |
Quarter hard | Light cold work when moderate strength must be combined with continued bending and drawing ability. | 400 | 483 | 25 | 76 HRB | — |
H02Default Half hard | Most widely stocked strip/sheet temper: good balance of strength, formability and flatness for hardware and contacts. | 505 | 565 | 12 | 84 HRB | — |
Full hard | High-strength flat stock for stamped parts with only gentle bends, and for wear-resistant decorative trim. | 585 | 655 | 4 | 89 HRB | — |
Extra hard | Use where near-spring strength is needed but full spring temper flatness is not required. | 655 | 725 | 3 | 92 HRB | — |
Spring hard | Standard choice for flat springs, contact fingers and diaphragms needing maximum elastic limit with good tarnish resistance. | 710 | 790 | 2 | 95 HRB | — |
Extra spring hard | Maximum-strength strip for thin, highly stressed springs formed with very generous bend radii only. | 745 | 825 | 2 | 19 HRC | 5.3 % IACS |
What is C77000?
C77000 is the strongest common unleaded wrought nickel silver (UNS C77000 / CW410J), combining high nickel with elevated zinc in the C70000-C79999 copper-nickel-zinc family and hardened by cold rolling from OS035 to H10. It reaches 505 MPa yield, 565 MPa tensile, 12% elongation and 84 HRB in the default condition, making it a standard strip choice for springs and plating base stock. Machinability is roughly 20% of free-cutting brass, hot working is limited, oxy-fuel welding is poor because of zinc loss, and service temperature is capped near 175 °C. C76400 is the nearest alternative in strip and wire. C77000 has a density of 8.72 g/cm³ (0.315 lb/in³), lighter than 54% of copper alloy grades. It melts at 1,010°C (1,850 °F). C77000 has a yield strength of 505 MPa (73.2 ksi) and a tensile strength of 565 MPa (81.9 ksi) — stronger than 90% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 124 GPa (18 Msi).
What is C77000 used for?
- springs
- silverware base metal for plating
- zippers
- marine hardware
- musical instrument fittings
Advantages
- Polishes to a fine finish — 90/100, better than 99% of copper alloy grades
- High strength — 505 MPa (73.2 ksi), better than 90% of copper alloy grades
Limitations
- Low electrical conductivity — 5.5 % IACS, worse than 95% 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 — 5.6 kg CO₂/kg, worse than 91% of copper alloy grades
C77000 properties
Typical room-temperature values for C77000-H02; bars are the position among copper alloy grades.
Physical3
C77000 has a density of 8.72 g/cm³ (0.315 lb/in³), lighter than 54% of copper alloy grades. It melts at 1,010°C (1,850 °F).
Mechanical12
C77000 has a yield strength of 505 MPa (73.2 ksi) and a tensile strength of 565 MPa (81.9 ksi) — stronger than 90% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 124 GPa (18 Msi).
Thermal6
C77000 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
C77000 conducts electricity at 5.5 % IACS, worse than 95% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C77000 takes about 78 MJ of energy and emits 5.6 kg of CO₂ — more than 90% of copper alloy grades. Typical recycled content is 35%.
Manufacturability7
C77000's machinability is poor (28/100, worse than 78% of copper alloy grades); weldability fair (40/100); formability fair (50/100).
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. C77000 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C77000
Is C77000 easy to machine?
Tough and gummy (≈20% of free-cutting brass) — use sharp positive-rake carbide, rigid setups, moderate speeds and generous coolant; consider leaded C79200 if turning volume is high.
Can C77000 be welded?
Resistance and GTAW welding are workable with low heat input; oxy-fuel welding is poor due to zinc fume loss, and soldering/silver brazing are the preferred joining routes.
Can C77000 be formed, bent or molded?
Excellent cold formability in OS035/H01 with interstage anneals at 600–750 °C; hot working is limited, and cold-worked parts should be stress-relieved (~260 °C) to avoid ammonia SCC.
C77000 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 |
|---|---|---|
| CuCu + sum of named elements ≥ 99.5% | 53.5 – 56.5 | 55 |
| NiNi includes Co | 16.5 – 19.5 | 18 |
| Pbunleaded grade | ≤ 0.05 | |
| Fe | ≤ 0.25 | |
| Mn | ≤ 0.5 | |
| Znremainder, nominally ~27% | balance |
What surface finishes work on C77000?
Takes a bright silver-white polish and accepts nickel, chrome, silver and gold plating readily; lacquer or clear coat for long-term tarnish protection — anodizing does not apply.
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 C77000 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CW410J
How much does C77000 cost?
C77000 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.
C77000 — frequently asked
What is C77000 used for?
C77000 is typically used for springs, silverware base metal for plating, zippers, marine hardware and musical instrument fittings. In short: strongest unleaded nickel silver; spring and zipper grade; high-nickel, high-zinc strip.
What is the yield strength of C77000?
C77000 has a typical yield strength of 505 MPa (73.2 ksi) and a tensile strength of 565 MPa (81.9 ksi) — stronger than 90% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C77000 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 78% of copper alloy grades). Tough and gummy (≈20% of free-cutting brass) — use sharp positive-rake carbide, rigid setups, moderate speeds and generous coolant; consider leaded C79200 if turning volume is high.
Can C77000 be welded?
With care — weldability is rated fair (40/100). Resistance and GTAW welding are workable with low heat input; oxy-fuel welding is poor due to zinc fume loss, and soldering/silver brazing are the preferred joining routes.
What surface finishes work on C77000?
Takes a bright silver-white polish and accepts nickel, chrome, silver and gold plating readily; lacquer or clear coat for long-term tarnish protection — anodizing does not apply.
Can C77000 be formed, bent or molded?
Excellent cold formability in OS035/H01 with interstage anneals at 600–750 °C; hot working is limited, and cold-worked parts should be stress-relieved (~260 °C) to avoid ammonia SCC.
What is the maximum service temperature of C77000?
C77000 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 C77000-H02 and C77000-OS035?
H02 is the default condition — most widely stocked strip/sheet temper: good balance of strength, formability and flatness for hardware and contacts. OS035: softest commercial condition for deep drawing, spinning and severe forming before final work-hardening. Yield strength is 505 MPa in H02 versus 186 MPa in OS035.
How much does C77000 cost?
C77000 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
- CDA Alloy Datasheet C77000 (Nickel Silver 55-18) — Copper Development Association (2023)
- ASTM B122/B122M Copper-Nickel-Zinc (Nickel Silver) Plate, Sheet, Strip and Rolled Bar — ASTM International (2022)
- ASTM B151/B151M Copper-Nickel-Zinc and Copper-Nickel Rod and Bar — ASTM International (2020)
- EN 12163 / EN 1652 CuNi18Zn27 (CW410J) — CEN (2016)
- 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; 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.