Copper Alloy C76200-H04
Supply condition
UNS C76200 · EN CW405J
H04 = full hard
For flat blanked parts, clips and stiff trim where only gentle forming along the grain is done.
Values for the H04 condition
Other C76200 tempers and conditions
C76200 is listed in 7 conditions; see the grade overview at C76200.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As hot rolled | Hot-rolled plate/bar stock for further machining or forming where no defined cold work is required. | 140 | 370 | 45 | 85 HB | 6 % IACS |
Annealed to 0.035 mm grain size | Choose for deep drawing, severe bending or spinning where maximum ductility is needed. | 152 | 386 | 40 | 95 HB | 6 % IACS |
Quarter hard | Light cold work for parts that still need moderate bending but more stiffness than annealed. | 310 | 450 | 25 | 130 HB | 5.7 % IACS |
H02Default Half hard | The general-purpose stocked strip temper: good balance of strength and 90° bendability for trim and stampings. | 448 | 517 | 10 | 155 HB | 5.5 % IACS |
H04This page Full hard | For flat blanked parts, clips and stiff trim where only gentle forming along the grain is done. | 517 | 586 | 3 | 175 HB | 5.5 % IACS |
Extra hard | High-strength strip for flat springs and contacts formed only with generous bend radii. | 586 | 655 | 2 | 190 HB | 5.5 % IACS |
Spring hard | Maximum strength/elastic limit temper for flat springs, contact fingers and snap parts. | 620 | 700 | 2 | 200 HB | 5.5 % IACS |
What is C76200-H04?
C76200-H04 is C76200 supplied in the H04 condition — for flat blanked parts, clips and stiff trim where only gentle forming along the grain is done. C76200-H04 has a yield strength of 517 MPa (75 ksi) and a tensile strength of 586 MPa (85 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 124 GPa (18 Msi). C76200-H04 has a density of 8.7 g/cm³ (0.314 lb/in³), lighter than 56% of copper alloy grades. It melts at 1,010°C (1,850 °F). H02 is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 90/100, better than 99% of copper alloy grades
- High strength — 517 MPa (75 ksi), better than 91% of copper alloy grades
Limitations
- Limited ductility — 3%, worse than 97% of copper alloy grades
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- 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
- High embodied carbon — 5 kg CO₂/kg, worse than 86% of copper alloy grades
C76200-H04 properties
Typical room-temperature values for C76200-H04; 12 are specific to this condition. Other listed values are C76200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C76200-H04 has a density of 8.7 g/cm³ (0.314 lb/in³), lighter than 56% of copper alloy grades. It melts at 1,010°C (1,850 °F).
Mechanical12
C76200-H04 has a yield strength of 517 MPa (75 ksi) and a tensile strength of 586 MPa (85 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 124 GPa (18 Msi).
Thermal6
C76200-H04 is rated for continuous service to 150°C (302 °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
C76200-H04 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 C76200-H04 takes about 72 MJ of energy and emits 5 kg of CO₂ — more than 86% of copper alloy grades. Typical recycled content is 40%.
Manufacturability6
C76200-H04's machinability is poor (34/100, worse than 53% of copper alloy grades); weldability fair (50/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C76200-H04
Is C76200 easy to machine?
Gummy, low-lead alloy — rating ≈20 % of free-cutting brass; use sharp positive-rake tools, high speed, generous coolant, or specify leaded C79200 when heavy turning is required.
Can C76200 be welded?
Resistance and brazing/soldering are the preferred joining routes; fusion welding risks zinc fume and porosity, so use silver brazing filler or spot welding.
Can C76200 be formed, bent or molded?
Excellent cold formability in OS035/H01 tempers (deep draw, roll form); anneal 600–750 °C between heavy passes and stress-relieve formed hard tempers to avoid ammonia SCC.
What surface finishes work on C76200?
Takes a high bright polish naturally silver-white; readily nickel-, chrome- or silver-plated, and can be chemically blackened or lacquered for decorative trim.
C76200 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 % | 57 – 61 | 59 |
| NiNi + Co | 11 – 13.5 | 12 |
| Pb | ≤ 0.1 | — |
| Fe | ≤ 0.25 | — |
| Mn | ≤ 0.5 | — |
| Zn | balance | — |
C76200-H04 — frequently asked
What is C76200-H04 used for?
C76200-H04 is typically used for hardware trim, costume jewelry, optical components and general stampings. In short: lowest-cost bright nickel silver; best formability in family; high-zinc, low-nickel grade.
What is the yield strength of C76200-H04?
C76200-H04 has a typical yield strength of 517 MPa (75 ksi) and a tensile strength of 586 MPa (85 ksi) — stronger than 91% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C76200-H04 easy to machine?
Not especially — machinability is rated poor (34/100, worse than 53% of copper alloy grades). Gummy, low-lead alloy — rating ≈20 % of free-cutting brass; use sharp positive-rake tools, high speed, generous coolant, or specify leaded C79200 when heavy turning is required.
Can C76200-H04 be welded?
With care — weldability is rated fair (50/100). Resistance and brazing/soldering are the preferred joining routes; fusion welding risks zinc fume and porosity, so use silver brazing filler or spot welding.
What surface finishes work on C76200-H04?
Takes a high bright polish naturally silver-white; readily nickel-, chrome- or silver-plated, and can be chemically blackened or lacquered for decorative trim.
Can C76200-H04 be formed, bent or molded?
Excellent cold formability in OS035/H01 tempers (deep draw, roll form); anneal 600–750 °C between heavy passes and stress-relieve formed hard tempers to avoid ammonia SCC.
What is the maximum service temperature of C76200-H04?
C76200-H04 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C76200-H02 and C76200-M20?
H02 is the default condition — the general-purpose stocked strip temper: good balance of strength and 90° bendability for trim and stampings. M20: hot-rolled plate/bar stock for further machining or forming where no defined cold work is required. Yield strength is 448 MPa in H02 versus 140 MPa in M20.
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 Database — C76200 property sheet — Copper Development Association (2023)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- EN 12163 / CW405J copper-nickel-zinc designations — CEN (2016)
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.