Copper Alloy C71520-H01
Supply condition
UNS C71520
H01 = quarter hard
Use where moderate strength increase is needed but the part still has to be bent or flared.
Values for the H01 condition
Other C71520 tempers and conditions
C71520 is listed in 8 conditions; see the grade overview at C71520.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
O60Default Soft annealed | Default stock condition for seawater tube, plate and fittings — maximum formability and best corrosion behaviour. | 140 | 380 | 45 | 85 HB | 4.6 % IACS |
As hot forged and air cooled | Standard mill condition for hot-forged valve bodies, flanges and fittings that are not subsequently annealed. | 165 | 380 | 40 | 95 HB | 4.6 % IACS |
As forged and quenched | Forgings water-quenched from finishing temperature to retain a solutionised, scale-free structure with the best seawater corrosion behaviour. | 170 | 395 | 42 | 90 HB | 4.6 % IACS |
As-welded deposit | Deposited ERCuNi filler condition — use these numbers when sizing joints in 90/10 and 70/30 Cu-Ni piping and vessels. | 250 | 400 | 30 | 105 HB | 4.3 % IACS |
Light drawn | Choose for condenser/heat-exchanger tube needing slightly higher strength and straightness than fully annealed while still expandable into tubesheets. | 255 | 415 | 30 | 110 HB | 4.6 % IACS |
H01This page Quarter hard | Use where moderate strength increase is needed but the part still has to be bent or flared. | 310 | 450 | 25 | 125 HB | — |
Half hard | Intermediate strength strip, rod and tube for fasteners, sleeves and machined fittings. | 415 | 505 | 15 | 150 HB | 4.5 % IACS |
Full hard | Pick for maximum strength and stiffness in springs, shafting and hard-drawn tube where little further forming is required. | 525 | 585 | 8 | 175 HB | — |
What is C71520-H01?
C71520-H01 is C71520 supplied in the H01 condition — use where moderate strength increase is needed but the part still has to be bent or flared. C71520-H01 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 152 GPa (22 Msi). C71520-H01 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,171°C (2,140 °F). O60 is the default condition FabDigit quotes; H01 is available on request or by drawing note.
Advantages
- Stiff — 152 GPa (22 Msi), better than 99% of copper alloy grades
- Readily welded — 90/100, better than 98% of copper alloy grades
- High service temperature — 350°C (662 °F), better than 95% of copper alloy grades
- Good corrosion resistance — 78/100, better than 94% of copper alloy grades
Limitations
- Low electrical conductivity — 4.6 % IACS, worse than 96% of copper alloy grades
- High embodied carbon — 6.6 kg CO₂/kg, worse than 96% of copper alloy grades
- Poor heat conductor — 29 W/m·K (16.8 BTU/hr·ft·°F), worse than 93% of copper alloy grades
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
C71520-H01 properties
Typical room-temperature values for C71520-H01; 11 are specific to this condition. Other listed values are C71520 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C71520-H01 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,171°C (2,140 °F).
Mechanical14
C71520-H01 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 152 GPa (22 Msi).
Thermal6
C71520-H01 is rated for continuous service to 350°C (662 °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
C71520-H01 conducts electricity at 4.6 % IACS, worse than 96% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of copper alloy grades.
Sustainability4
Producing a kilogram of C71520-H01 takes about 90 MJ of energy and emits 6.6 kg of CO₂ — more than 93% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C71520-H01's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability excellent (90/100); formability good (60/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C71520-H01
Is C71520 easy to machine?
Gummy and work-hardening — run sharp positive-rake carbide at low speed, heavy positive feed and generous coolant; rating only about 20% of AISI 1212.
Can C71520 be welded?
Very good with GTAW/GMAW using ERCuNi (Ti-deoxidised) filler, no preheat, low interpass temperature, and scrupulously clean, oil- and sulphur-free surfaces to avoid porosity and hot cracking.
Can C71520 be formed, bent or molded?
Excellent cold formability in O60 — deep draws, tube bends and expansions are routine; interanneal at 700–850 °C followed by rapid cooling after roughly 50% reduction, and hot work at 850–1000 °C.
What surface finishes work on C71520?
Takes a bright polish and self-forms a protective brown-green patina in seawater; do not anodize — use pickling/passivation, tin or nickel plating, or marine paint over an etch primer where colour matching is needed.
C71520 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 |
|---|---|---|
| Ninickel plus cobalt | 29 – 33 | 31 |
| Feessential for erosion-corrosion resistance | 0.4 – 1 | 0.6 |
| Mn | ≤ 1 | 0.6 |
| Zn | ≤ 1 | — |
| Pb0.02 max for condenser tube per ASTM B111 | ≤ 0.05 | — |
| C | ≤ 0.05 | — |
| S | ≤ 0.02 | — |
| P | ≤ 0.02 | — |
| Tionly in ERCuNi filler per AWS A5.7 (deoxidiser) | 0.2 – 0.5 | 0.3 |
| Cu65.0 % min including silver | balance | — |
C71520-H01 — frequently asked
What is C71520-H01 used for?
C71520-H01 is typically used for welding of Cu-Ni piping, marine pipe fabrication and condenser repair welds. In short: 70/30 Cu-Ni filler metal; matches base-metal corrosion; top weldability in family.
What is the yield strength of C71520-H01?
C71520-H01 has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 64% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C71520-H01 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Gummy and work-hardening — run sharp positive-rake carbide at low speed, heavy positive feed and generous coolant; rating only about 20% of AISI 1212.
Can C71520-H01 be welded?
Yes — weldability is rated excellent (90/100). Very good with GTAW/GMAW using ERCuNi (Ti-deoxidised) filler, no preheat, low interpass temperature, and scrupulously clean, oil- and sulphur-free surfaces to avoid porosity and hot cracking.
What surface finishes work on C71520-H01?
Takes a bright polish and self-forms a protective brown-green patina in seawater; do not anodize — use pickling/passivation, tin or nickel plating, or marine paint over an etch primer where colour matching is needed.
Can C71520-H01 be formed, bent or molded?
Excellent cold formability in O60 — deep draws, tube bends and expansions are routine; interanneal at 700–850 °C followed by rapid cooling after roughly 50% reduction, and hot work at 850–1000 °C.
What is the maximum service temperature of C71520-H01?
C71520-H01 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C71520-O60 and C71520-H04?
O60 is the default condition — default stock condition for seawater tube, plate and fittings — maximum formability and best corrosion behaviour. H04: pick for maximum strength and stiffness in springs, shafting and hard-drawn tube where little further forming is required. Yield strength is 140 MPa in O60 versus 525 MPa in H04.
Sources
- ASTM B111/B111M — Copper and Copper-Alloy Seamless Condenser Tubes — ASTM International (2021)
- ASTM B466/B466M — Seamless Copper-Nickel Pipe and Tube — ASTM International (2020)
- AWS A5.7/A5.7M — Copper and Copper-Alloy Bare Welding Rods and Electrodes (ERCuNi) — American Welding Society (2007)
- C71520 alloy datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Copper-Nickel Alloys: Properties and Applications in Seawater Systems — Nickel Institute / CDA (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.