Copper Alloy C75200
UNS C75200 · EN CW409J
C75200 is the classic 65-18 wrought copper-nickel-zinc nickel silver (UNS C75200 / CW409J) in the C70000-C79999 family, strengthened by solid solution and cold work rather than heat treatment.
Reference datasheet — C75200 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
C75200 tempers and conditions
C75200 is supplied in 9 conditions, soft to hard. H02 is the default FabDigit quotes; the values on this page are for it.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose for deep drawing, spinning and severe forming of flatware and instrument parts before final work-hardening. | 172 | 400 | 40 | 100 HB | 6 % IACS |
As hot rolled | Pick for hot-rolled plate/bar stock that will be machined or subsequently cold-finished; softest commercial mill condition. | 180 | 407 | 37 | 102 HB | — |
Annealed to 0.035 mm grain size | Grain-size-controlled soft strip for consistent draw/stamp behaviour and a fine, streak-free polished surface. | 190 | 414 | 38 | 107 HB | 6 % IACS |
Quarter hard | Best compromise when parts still need moderate bending or drawing but require more stiffness than annealed strip. | 310 | 448 | 15 | 133 HB | — |
H02Default Half hard | The default stocked strip/sheet temper: enough strength for flatware, escutcheons and hardware while still allowing gentle forming. | 427 | 517 | 6 | 160 HB | — |
Full hard | Use where flatness, edge stiffness and wear resistance matter — knife handles, trim strips, blanked contacts with only gentle bends. | 517 | 586 | 3 | 177 HB | — |
Extra hard | For high-strength flat parts and light springs where only very small-radius bends parallel to rolling are needed. | 586 | 655 | 2 | 188 HB | — |
Spring hard | Select for flat springs, clips, reed/valve parts and connector contacts needing high elastic limit with non-magnetic behaviour. | 640 | 700 | 2 | 198 HB | — |
Extra spring hard | Maximum cold-worked strength for thin strip springs and shims; essentially no bending capability across the grain. | 690 | 758 | 1 | 18 HRC | 5.5 % IACS |
What is C75200?
C75200 is the classic 65-18 wrought copper-nickel-zinc nickel silver (UNS C75200 / CW409J) in the C70000-C79999 family, strengthened by solid solution and cold work rather than heat treatment. It offers the whitest, most silver-like appearance in the family with useful strength — 427 MPa yield, 517 MPa tensile, 6% elongation and 160 HB (85 HRB) in the default condition — and is stocked as strip, sheet, wire and rod from O61 through H10. Limits are machinability of about 25 (roughly 20% of free-cutting brass), weldability of about 45 because of zinc fuming, and service to roughly 200 °C. Specify leaded C79200 where screw-machine output matters. C75200 has a density of 8.73 g/cm³ (0.315 lb/in³), lighter than 53% of copper alloy grades. It melts at 1,021°C (1,870 °F). C75200 has a yield strength of 427 MPa (61.9 ksi) and a tensile strength of 517 MPa (75 ksi) — stronger than 83% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 125 GPa (18.1 Msi).
What is C75200 used for?
- flatware and cutlery
- musical instrument fittings
- zippers
- coinage blanks
- optical frames
Advantages
- Polishes to a fine finish — 92/100, better than 100% of copper alloy grades
- High strength — 427 MPa (61.9 ksi), better than 83% of copper alloy grades
Limitations
- Low electrical conductivity — 6 % IACS, worse than 93% of copper alloy grades
- High embodied carbon — 5.6 kg CO₂/kg, worse than 91% of copper alloy grades
- Limited ductility — 6%, worse than 89% of copper alloy grades
- Poor heat conductor — 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 89% of copper alloy grades
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
C75200 properties
Typical room-temperature values for C75200-H02; bars are the position among copper alloy grades.
Physical3
C75200 has a density of 8.73 g/cm³ (0.315 lb/in³), lighter than 53% of copper alloy grades. It melts at 1,021°C (1,870 °F).
Mechanical12
C75200 has a yield strength of 427 MPa (61.9 ksi) and a tensile strength of 517 MPa (75 ksi) — stronger than 83% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 125 GPa (18.1 Msi).
Thermal6
C75200 is rated for continuous service to 200°C (392 °F). It conducts heat at 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 89% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C75200 conducts electricity at 6 % IACS, worse than 93% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C75200 takes about 82 MJ of energy and emits 5.6 kg of CO₂ — more than 91% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C75200's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability fair (45/100); 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. C75200 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C75200
Is C75200 easy to machine?
Gummy and abrasive on tooling — rating ~20 % of free-cutting brass; use sharp positive-rake carbide, high speed, low feed and generous coolant, or switch to leaded C79200 for screw-machine work.
Can C75200 be welded?
Solders and silver-brazes excellently; resistance and GTAW welding are workable with low heat input and matching Cu-Ni filler, but zinc fuming, hot-shortness and post-weld colour mismatch limit fusion welding.
Can C75200 be formed, bent or molded?
Anneal at 600–750 °C for deep drawing/spinning; work-hardens fast, so plan interstage anneals and stress-relieve cold-worked parts (~250 °C) to avoid ammonia-related stress-corrosion cracking.
C75200 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 + named elements ≥ 99.5 % | 63.5 – 66.5 | 65 |
| NiNi + Co | 16.5 – 19.5 | 18 |
| Pb | ≤ 0.05 | |
| Fe | ≤ 0.25 | |
| Mn | ≤ 0.5 | |
| Zn | balance |
What surface finishes work on C75200?
Polishes to a bright silver-white lustre and takes silver, nickel or chrome plating readily; lacquer or plate for tarnish protection — it cannot be anodized.
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 C75200 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CW409J
How much does C75200 cost?
C75200 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.
C75200 — frequently asked
What is C75200 used for?
C75200 is typically used for flatware and cutlery, musical instrument fittings, zippers, coinage blanks and optical frames. In short: whitest nickel silver; highest-nickel 65-18 grade; flatware-grade appearance.
What is the yield strength of C75200?
C75200 has a typical yield strength of 427 MPa (61.9 ksi) and a tensile strength of 517 MPa (75 ksi) — stronger than 83% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C75200 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Gummy and abrasive on tooling — rating ~20 % of free-cutting brass; use sharp positive-rake carbide, high speed, low feed and generous coolant, or switch to leaded C79200 for screw-machine work.
Can C75200 be welded?
With care — weldability is rated fair (45/100). Solders and silver-brazes excellently; resistance and GTAW welding are workable with low heat input and matching Cu-Ni filler, but zinc fuming, hot-shortness and post-weld colour mismatch limit fusion welding.
What surface finishes work on C75200?
Polishes to a bright silver-white lustre and takes silver, nickel or chrome plating readily; lacquer or plate for tarnish protection — it cannot be anodized.
Can C75200 be formed, bent or molded?
Anneal at 600–750 °C for deep drawing/spinning; work-hardens fast, so plan interstage anneals and stress-relieve cold-worked parts (~250 °C) to avoid ammonia-related stress-corrosion cracking.
What is the maximum service temperature of C75200?
C75200 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C75200-H02 and C75200-H10?
H02 is the default condition — the default stocked strip/sheet temper: enough strength for flatware, escutcheons and hardware while still allowing gentle forming. H10: maximum cold-worked strength for thin strip springs and shims; essentially no bending capability across the grain. Yield strength is 427 MPa in H02 versus 690 MPa in H10.
How much does C75200 cost?
C75200 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
- 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 (2021)
- CDA Alloy C75200 property datasheet — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- EN 12163 / CW409J (CuNi18Zn20) wrought nickel silver — CEN (2016)
- GB/T 2059 / GB/T 2040 (BZn18-17) — SAC (2017)
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.