Copper Alloy C70600-H08
Supply condition
UNS C70600 · ASTM B111/B466 · EN CuNi10Fe1Mn, CW352H · GB BFe10-1-1
H08 = spring hard
Maximum cold-worked strength for springs, diaphragms and contacts in marine or brackish environments.
Values for the H08 condition
Other C70600 tempers and conditions
C70600 is listed in 9 conditions; see the grade overview at C70600.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Fully soft annealed strip/tube for deep drawing, tube expanding into tubesheets and severe bending. | 110 | 300 | 42 | 60 HB | 9.5 % IACS |
OS050Default Annealed to 0.050 mm grain size | Standard stocked annealed condition for seawater tube, plate and sheet where maximum ductility and formability are needed. | 120 | 310 | 40 | 65 HB | 9.5 % IACS |
As hot rolled | Hot-rolled plate condition for welded seawater piping, tubesheets and structural marine fabrications. | 140 | 315 | 35 | 70 HB | 9.5 % IACS |
Light drawn | Preferred condition for condenser and heat-exchanger tube needing higher pressure rating while still expandable into tubesheets. | 250 | 350 | 25 | 90 HB | 9.3 % IACS |
Quarter hard | Mild cold-worked strip/rod when moderate strength must be combined with continued bending and forming. | 290 | 360 | 20 | 100 HB | 9.3 % IACS |
Half hard | General-purpose cold-worked temper for pressure tube, fittings and machined parts requiring higher yield strength. | 380 | 415 | 10 | 125 HB | 9.2 % IACS |
Full hard | Hard temper strip/rod/tube for maximum strength in mildly formed or straight parts; expect springback and low ductility. | 440 | 470 | 6 | 145 HB | 9.1 % IACS |
Extra hard | Heavily cold-worked strip for flat springs, clips and wear surfaces where forming is minimal. | 480 | 510 | 4 | 160 HB | 9 % IACS |
H08This page Spring hard | Maximum cold-worked strength for springs, diaphragms and contacts in marine or brackish environments. | 515 | 545 | 3 | 170 HB | 9 % IACS |
What is C70600-H08?
C70600-H08 is C70600 supplied in the H08 condition — maximum cold-worked strength for springs, diaphragms and contacts in marine or brackish environments. C70600-H08 has a yield strength of 515 MPa (74.7 ksi) and a tensile strength of 545 MPa (79 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 124 GPa (18 Msi). C70600-H08 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,100°C (2,012 °F). OS050 is the default condition FabDigit quotes; H08 is available on request or by drawing note.
Advantages
- High strength — 515 MPa (74.7 ksi), better than 91% of copper alloy grades
- Readily welded — 78/100, better than 91% of copper alloy grades
- Good corrosion resistance — 74/100, better than 88% of copper alloy grades
Limitations
- Limited ductility — 3%, worse than 97% of copper alloy grades
- High embodied carbon — 5.2 kg CO₂/kg, worse than 88% of copper alloy grades
- Poor heat conductor — 37 W/m·K (21.4 BTU/hr·ft·°F), worse than 85% of copper alloy grades
- Low electrical conductivity — 9 % IACS, worse than 78% of copper alloy grades
C70600-H08 properties
Typical room-temperature values for C70600-H08; 14 are specific to this condition. Other listed values are C70600 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C70600-H08 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,100°C (2,012 °F).
Mechanical13
C70600-H08 has a yield strength of 515 MPa (74.7 ksi) and a tensile strength of 545 MPa (79 ksi) — stronger than 91% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 124 GPa (18 Msi).
Thermal6
C70600-H08 is rated for continuous service to 200°C (392 °F). It conducts heat at 37 W/m·K (21.4 BTU/hr·ft·°F), worse than 85% of copper alloy grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
C70600-H08 conducts electricity at 9 % IACS, worse than 78% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (74/100), better than 88% of copper alloy grades.
Sustainability4
Producing a kilogram of C70600-H08 takes about 75 MJ of energy and emits 5.2 kg of CO₂ — more than 88% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C70600-H08's machinability is fair (45/100, better than 64% of copper alloy grades); weldability very good (78/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C70600-H08
Is C70600 easy to machine?
Gummy, work-hardening chip: use positive-rake sharp carbide, moderate speed (~60–90 m/min), heavy feed and generous coolant; rating only ~20 % of free-cutting brass.
Can C70600 be welded?
Excellent with GTAW/GMAW using CuNi 70/30 filler (ERCuNi/AWS A5.7); no preheat, keep interpass cool, avoid sulfur/carbon contamination and back-purge to prevent oxide entrapment.
Can C70600 be formed, bent or molded?
Very good cold formability in O60/OS050 — deep drawing, tube bending and tubesheet expansion are routine; anneal 700–850 °C then water quench between heavy reductions.
What surface finishes work on C70600?
Not anodizable; typically supplied clean/pickled and left to form its protective seawater film. Can be polished, tin- or nickel-plated; avoid pre-service exposure to sulfide-polluted water.
C70600 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 |
|---|---|---|
| Niincludes Co | 9 – 11 | 10 |
| Feessential for impingement resistance | 1 – 1.8 | 1.5 |
| Mn | 0 – 1 | 0.6 |
| Zn | ≤ 1 | — |
| Pb0.02 max for welded tube per some specs | ≤ 0.05 | — |
| C | ≤ 0.05 | — |
| S | ≤ 0.02 | — |
| Cu86.5 % min including Ag | balance | — |
C70600-H08 — frequently asked
What is C70600-H08 used for?
C70600-H08 is typically used for seawater piping systems, condenser and heat-exchanger tubes, shipbuilding hardware and offshore desalination equipment. In short: standard 90/10 marine cupronickel; strong biofouling resistance; highly weldable copper alloy.
What is the yield strength of C70600-H08?
C70600-H08 has a typical yield strength of 515 MPa (74.7 ksi) and a tensile strength of 545 MPa (79 ksi) — stronger than 91% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C70600-H08 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Gummy, work-hardening chip: use positive-rake sharp carbide, moderate speed (~60–90 m/min), heavy feed and generous coolant; rating only ~20 % of free-cutting brass.
Can C70600-H08 be welded?
Yes — weldability is rated very good (78/100). Excellent with GTAW/GMAW using CuNi 70/30 filler (ERCuNi/AWS A5.7); no preheat, keep interpass cool, avoid sulfur/carbon contamination and back-purge to prevent oxide entrapment.
What surface finishes work on C70600-H08?
Not anodizable; typically supplied clean/pickled and left to form its protective seawater film. Can be polished, tin- or nickel-plated; avoid pre-service exposure to sulfide-polluted water.
Can C70600-H08 be formed, bent or molded?
Very good cold formability in O60/OS050 — deep drawing, tube bending and tubesheet expansion are routine; anneal 700–850 °C then water quench between heavy reductions.
What is the maximum service temperature of C70600-H08?
C70600-H08 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 C70600-OS050 and C70600-H08?
OS050 is the default condition — standard stocked annealed condition for seawater tube, plate and sheet where maximum ductility and formability are needed. H08: maximum cold-worked strength for springs, diaphragms and contacts in marine or brackish environments. Yield strength is 120 MPa in OS050 versus 515 MPa in H08.
Sources
- ASTM B111/B111M — Copper and Copper-Alloy Seamless Condenser Tubes — ASTM (2021)
- ASTM B466/B466M — Seamless Copper-Nickel Pipe and Tube — ASTM (2020)
- EN 12449 / CW352H CuNi10Fe1Mn — CEN (2016)
- C70600 alloy datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys — ASM International (1990)
- Guide to the Use of Copper-Nickel Alloys in Seawater Systems — Nickel Institute / CDA (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.