Copper Alloy C73100-H04
Supply condition
UNS C73100
H04 = full hard
Pick for flat blanked parts, light springs and stiff trim needing high strength with only gentle forming.
Values for the H04 condition
Other C73100 tempers and conditions
C73100 is listed in 7 conditions; see the grade overview at C73100.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for deep drawing, spinning and severe bending of decorative parts. | 125 | 340 | 43 | 60 HB | — |
Quarter hard | Pick when moderate forming is still needed but annealed strength is too low. | 275 | 400 | 25 | 100 HB | 10 % IACS |
H02Default Half hard | Most stocked general-purpose temper: balanced strength and bendability for trim, escutcheons and stamped hardware. | 345 | 450 | 15 | 65 HRB | — |
H04This page Full hard | Pick for flat blanked parts, light springs and stiff trim needing high strength with only gentle forming. | 450 | 525 | 5 | 78 HRB | — |
Extra hard | Pick for flat contacts, snap parts and stiff strip where formability is not required. | 520 | 585 | 3 | 84 HRB | — |
Spring hard | Pick for flat springs, clips and reed-type parts needing high elastic limit. | 560 | 620 | 2.5 | 190 HB | 9.5 % IACS |
Extra spring hard | Pick only for the highest-stiffness thin strip springs; essentially no bend formability. | 585 | 655 | 2 | 200 HB | 9.5 % IACS |
What is C73100-H04?
C73100-H04 is C73100 supplied in the H04 condition — pick for flat blanked parts, light springs and stiff trim needing high strength with only gentle forming. C73100-H04 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 525 MPa (76.1 ksi) — stronger than 86% of copper alloy grades. Elongation at break is 5% and the elastic modulus is 125 GPa (18.1 Msi). C73100-H04 has a density of 8.73 g/cm³ (0.315 lb/in³), lighter than 53% of copper alloy grades. It melts at 1,040°C (1,904 °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 — 450 MPa (65.3 ksi), better than 86% of copper alloy grades
Limitations
- Limited ductility — 5%, worse than 93% of copper alloy grades
- High embodied carbon — 4.6 kg CO₂/kg, worse than 82% of copper alloy grades
- Poor heat conductor — 45 W/m·K (26 BTU/hr·ft·°F), worse than 76% of copper alloy grades
C73100-H04 properties
Typical room-temperature values for C73100-H04; 11 are specific to this condition. Other listed values are C73100 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C73100-H04 has a density of 8.73 g/cm³ (0.315 lb/in³), lighter than 53% of copper alloy grades. It melts at 1,040°C (1,904 °F).
Mechanical11
C73100-H04 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 525 MPa (76.1 ksi) — stronger than 86% of copper alloy grades. Elongation at break is 5% and the elastic modulus is 125 GPa (18.1 Msi).
Thermal6
C73100-H04 is rated for continuous service to 180°C (356 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), worse than 76% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C73100-H04 conducts electricity at 10 % IACS, worse than 74% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C73100-H04 takes about 65 MJ of energy and emits 4.6 kg of CO₂ — more than 81% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C73100-H04's machinability is fair (40/100, better than 57% of copper alloy grades); weldability good (55/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C73100-H04
Is C73100 easy to machine?
Gummy, low machinability (~20 % of free-cutting brass); use sharp positive-rake carbide tools, high speed, light feeds and generous coolant, or specify a leaded nickel silver for screw-machine work.
Can C73100 be welded?
Resistance and brazing/soldering are the preferred joining routes; fusion welding needs low heat input and risks zinc fume and porosity, and hot-short cracking in heavily cold-worked stock.
Can C73100 be formed, bent or molded?
Excellent cold formability in O60/H01 for deep drawing and spinning; stress-relieve after severe forming (about 260–300 °C) to avoid ammonia-related stress-corrosion cracking.
What surface finishes work on C73100?
Buffs to a bright silver-white finish; usually clear-lacquered, or nickel/chrome/silver plated for tarnish resistance — anodizing does not apply.
C73100 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 |
|---|---|---|
| Cuhigh-copper nickel silver base | 73.5 – 76.5 | 75 |
| NiNi + Co counted together | 8 – 10 | 9 |
| Fe | ≤ 0.25 | — |
| Mn | ≤ 0.5 | — |
| Pb | ≤ 0.1 | — |
| Zn | balance | — |
C73100-H04 — frequently asked
What is C73100-H04 used for?
C73100-H04 is typically used for decorative hardware, costume jewelry, zippers and musical instrument parts. In short: low-cost silver-look alloy; good deep-drawing nickel silver; low nickel content.
What is the yield strength of C73100-H04?
C73100-H04 has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 525 MPa (76.1 ksi) — stronger than 86% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C73100-H04 easy to machine?
Not especially — machinability is rated fair (40/100, better than 57% of copper alloy grades). Gummy, low machinability (~20 % of free-cutting brass); use sharp positive-rake carbide tools, high speed, light feeds and generous coolant, or specify a leaded nickel silver for screw-machine work.
Can C73100-H04 be welded?
Yes — weldability is rated good (55/100). Resistance and brazing/soldering are the preferred joining routes; fusion welding needs low heat input and risks zinc fume and porosity, and hot-short cracking in heavily cold-worked stock.
What surface finishes work on C73100-H04?
Buffs to a bright silver-white finish; usually clear-lacquered, or nickel/chrome/silver plated for tarnish resistance — anodizing does not apply.
Can C73100-H04 be formed, bent or molded?
Excellent cold formability in O60/H01 for deep drawing and spinning; stress-relieve after severe forming (about 260–300 °C) to avoid ammonia-related stress-corrosion cracking.
What is the maximum service temperature of C73100-H04?
C73100-H04 is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C73100-H02 and C73100-H10?
H02 is the default condition — most stocked general-purpose temper: balanced strength and bendability for trim, escutcheons and stamped hardware. H10: pick only for the highest-stiffness thin strip springs; essentially no bend formability. Yield strength is 345 MPa in H02 versus 585 MPa in H10.
Sources
- Copper Alloy Datasheets (C7xxxx nickel silvers) — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASTM B122/B122M — Copper-Nickel-Tin, Copper-Nickel-Zinc and Copper-Nickel Plate, Sheet, Strip and Rolled Bar — ASTM (2021)
- ASTM B36/B36M and temper designations per ASTM B601 — ASTM (2018)
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.