Copper Alloy C61500-H08
Supply condition
UNS C61500
H08 = spring hard
Spring, diaphragm and contact stock: highest strength and elastic limit of the flat-rolled tempers, with minimal formability.
Values for the H08 condition
Other C61500 tempers and conditions
C61500 is listed in 6 conditions; see the grade overview at C61500.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
O60Default Soft annealed | Choose for deep drawing, severe bending and forming, or when maximum ductility and toughness are needed before final heat/work hardening. | 215 | 500 | 50 | 130 HB | 10.5 % IACS |
Light annealed | Choose when moderate forming ability must be combined with somewhat higher strength and better flatness than a full anneal. | 290 | 550 | 35 | 155 HB | 10.5 % IACS |
Half hard | General-purpose cold-rolled temper: good strength with enough ductility for moderate bends and light forming. | 480 | 620 | 12 | 180 HB | 10 % IACS |
Full hard | Pick for high-strength flat parts, washers, bushing stock and wear surfaces where only gentle forming is required. | 585 | 690 | 6 | 205 HB | 10 % IACS |
Extra hard | Use where near-maximum strength and stiffness in thin gauge are needed and forming is limited to flat blanking or slight bends with grain. | 640 | 725 | 4 | 220 HB | 10 % IACS |
H08This page Spring hard | Spring, diaphragm and contact stock: highest strength and elastic limit of the flat-rolled tempers, with minimal formability. | 690 | 760 | 3 | 235 HB | 10 % IACS |
What is C61500-H08?
C61500-H08 is C61500 supplied in the H08 condition — spring, diaphragm and contact stock: highest strength and elastic limit of the flat-rolled tempers, with minimal formability. C61500-H08 has a yield strength of 690 MPa (100 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 96% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 117 GPa (17 Msi). C61500-H08 has a density of 7.72 g/cm³ (0.279 lb/in³), lighter than 89% of copper alloy grades. It melts at 1,045°C (1,913 °F). O60 is the default condition FabDigit quotes; H08 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 82/100, better than 98% of copper alloy grades
- High strength — 690 MPa (100 ksi), better than 96% of copper alloy grades
Limitations
- Limited ductility — 3%, worse than 97% of copper alloy grades
- Poor heat conductor — 45 W/m·K (26 BTU/hr·ft·°F), worse than 76% of copper alloy grades
- Limited formability — 18/100, worse than 75% of copper alloy grades
C61500-H08 properties
Typical room-temperature values for C61500-H08; 13 are specific to this condition. Other listed values are C61500 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C61500-H08 has a density of 7.72 g/cm³ (0.279 lb/in³), lighter than 89% of copper alloy grades. It melts at 1,045°C (1,913 °F).
Mechanical14
C61500-H08 has a yield strength of 690 MPa (100 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 96% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C61500-H08 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
C61500-H08 conducts electricity at 10 % IACS, worse than 74% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 98% of copper alloy grades.
Sustainability4
Producing a kilogram of C61500-H08 takes about 57 MJ of energy and emits 3.6 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C61500-H08's machinability is fair (38/100, better than 55% of copper alloy grades); weldability fair (48/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C61500-H08
Is C61500 easy to machine?
Tough, work-hardening chips: use rigid setups, positive-rake carbide, moderate speed with heavy feed and generous flood coolant; avoid dwelling to prevent glazing.
Can C61500 be welded?
GTAW/GMAW with matching aluminium-bronze filler (ERCuAl-A2) works well; remove alumina film mechanically or with AC/He shielding, keep interpass temperature low and expect loss of cold-worked strength in the HAZ.
Can C61500 be formed, bent or molded?
Form in O60/O50 tempers — deep drawing and severe bends are practical; hard tempers should only be blanked or bent gently with the grain, with interstage annealing at 600–700 °C followed by rapid cooling.
What surface finishes work on C61500?
Not anodisable; polishes to a rich golden lustre, accepts nickel/chrome or tin plating after thorough oxide removal (alkaline clean + acid activation), and self-passivates in service to a stable brown-olive film.
C61500 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 |
|---|---|---|
| Al | 7.7 – 8.3 | 8 |
| Niraises strength and dealuminification resistance | 1.8 – 2.2 | 2 |
| Curemainder, Cu + named elements ≥ 99.5 % | ≥ 89 (balance) | — |
C61500-H08 — frequently asked
What is C61500-H08 used for?
C61500-H08 is typically used for valve components, marine fasteners and pump shafts. In short: nickel-strengthened aluminum bronze; formable and corrosion resistant; 400 °C service capability.
What is the yield strength of C61500-H08?
C61500-H08 has a typical yield strength of 690 MPa (100 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 96% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C61500-H08 easy to machine?
Not especially — machinability is rated fair (38/100, better than 55% of copper alloy grades). Tough, work-hardening chips: use rigid setups, positive-rake carbide, moderate speed with heavy feed and generous flood coolant; avoid dwelling to prevent glazing.
Can C61500-H08 be welded?
With care — weldability is rated fair (48/100). GTAW/GMAW with matching aluminium-bronze filler (ERCuAl-A2) works well; remove alumina film mechanically or with AC/He shielding, keep interpass temperature low and expect loss of cold-worked strength in the HAZ.
What surface finishes work on C61500-H08?
Not anodisable; polishes to a rich golden lustre, accepts nickel/chrome or tin plating after thorough oxide removal (alkaline clean + acid activation), and self-passivates in service to a stable brown-olive film.
Can C61500-H08 be formed, bent or molded?
Form in O60/O50 tempers — deep drawing and severe bends are practical; hard tempers should only be blanked or bent gently with the grain, with interstage annealing at 600–700 °C followed by rapid cooling.
What is the maximum service temperature of C61500-H08?
C61500-H08 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 C61500-O60 and C61500-H08?
O60 is the default condition — choose for deep drawing, severe bending and forming, or when maximum ductility and toughness are needed before final heat/work hardening. H08: spring, diaphragm and contact stock: highest strength and elastic limit of the flat-rolled tempers, with minimal formability. Yield strength is 215 MPa in O60 versus 690 MPa in H08.
Sources
- C61500 alloy data (Copper Development Association alloy database) — CDA / copper.org (2023)
- ASTM B169 – Copper-Aluminum Alloy Plate, Sheet, Strip and Rolled Bar — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (copper alloys in seawater) — ASM International (2005)
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.