Copper Alloy C70620-H02
Supply condition
UNS C70620
H02 = half hard
General structural temper for strip, sheet and drawn tube where strength matters more than deep forming.
Values for the H02 condition
Other C70620 tempers and conditions
C70620 is listed in 7 conditions; see the grade overview at C70620.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
O60Default Soft annealed | Standard condition for condenser/heat-exchanger tube, U-bends and cold-formed parts; maximum ductility and best corrosion consistency. | 120 | 310 | 40 | 65 HB | 9.5 % IACS |
As hot rolled | Mill hot-worked plate, tube shell or extrusion, taken as-processed; used where subsequent forming, welding or machining will follow. | 135 | 320 | 35 | 70 HB | 9.5 % IACS |
Quarter hard | Light temper for tube and strip needing higher yield strength while retaining useful bendability. | 255 | 365 | 20 | 95 HB | 9.5 % IACS |
Cold worked and stress relieved | Cold-drawn tube given a low-temperature stress relief to cut residual stress before seawater or condensate service. | 330 | 400 | 15 | 110 HB | 9 % IACS |
H02This page Half hard | General structural temper for strip, sheet and drawn tube where strength matters more than deep forming. | 360 | 415 | 12 | 120 HB | 9.5 % IACS |
Extra hard | Heavily cold-worked strip/tube for high-strength, wear- and pressure-resisting parts with only slight forming. | 450 | 490 | 6 | 150 HB | 9.5 % IACS |
Spring hard | Maximum cold-worked strength for springy strip, clips and diaphragms in marine/condensate environments. | 485 | 525 | 4 | 165 HB | 9.5 % IACS |
What is C70620-H02?
C70620-H02 is C70620 supplied in the H02 condition — general structural temper for strip, sheet and drawn tube where strength matters more than deep forming. C70620-H02 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 74% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 124 GPa (18 Msi). C70620-H02 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). O60 is the default condition FabDigit quotes; H02 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 80/100, better than 96% of copper alloy grades
- Readily welded — 82/100, better than 95% of copper alloy grades
- High service temperature — 260°C (500 °F), better than 75% of copper alloy grades
Limitations
- High embodied carbon — 5.2 kg CO₂/kg, worse than 88% of copper alloy grades
- Poor heat conductor — 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 82% of copper alloy grades
- Low electrical conductivity — 9.5 % IACS, worse than 76% of copper alloy grades
C70620-H02 properties
Typical room-temperature values for C70620-H02; 13 are specific to this condition. Other listed values are C70620 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C70620-H02 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).
Mechanical14
C70620-H02 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 74% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 124 GPa (18 Msi).
Thermal6
C70620-H02 is rated for continuous service to 260°C (500 °F). It conducts heat at 40 W/m·K (23.1 BTU/hr·ft·°F), worse than 82% of copper alloy grades. Thermal expansion is 17.1 µm/m·K (9.5 µin/in·°F).
Electrical3
C70620-H02 conducts electricity at 9.5 % IACS, worse than 76% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 96% of copper alloy grades.
Sustainability4
Producing a kilogram of C70620-H02 takes about 70 MJ of energy and emits 5.2 kg of CO₂ — more than 84% of copper alloy grades. Typical recycled content is 25%.
Manufacturability8
C70620-H02's machinability is fair (35/100, better than 51% of copper alloy grades); weldability very good (82/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C70620-H02
Is C70620 easy to machine?
Gummy and work-hardening — rate ≈20 % of free-cutting brass; use sharp positive-rake carbide, moderate speed, heavy feed and generous coolant to avoid built-up edge.
Can C70620 be welded?
Designed for welding: GTAW/GMAW with C7158 (65/35 Cu-Ni) filler, no preheat, low interpass temperature, argon back-purge; keep joints oil- and sulphur-free to avoid hot cracking.
Can C70620 be formed, bent or molded?
Excellent cold formability in O60 (deep drawing, U-bending, expansion); work-hardens fast, so interstage anneal at 700–850 °C with rapid cooling; hot work 850–950 °C.
What surface finishes work on C70620?
Not anodizable; pickle in sulphuric/hydrogen-peroxide or inhibited nitric to remove weld oxide, then form the protective film with clean-water commissioning (or FeSO₄ dosing); takes a good mechanical or electro-polish.
C70620 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 |
| Feiron addition gives impingement resistance | 1 – 1.8 | 1.5 |
| Mncontrolled range (deoxidation, weldability) | 0.5 – 1 | 0.7 |
| Zn | ≤ 0.5 | — |
| Pbtightened vs C70600 for weldability | ≤ 0.02 | — |
| C | ≤ 0.05 | — |
| S | ≤ 0.02 | — |
| P | ≤ 0.02 | — |
| CuCu + Ag remainder, ≈86.5 % min | balance | — |
C70620-H02 — frequently asked
What is C70620-H02 used for?
C70620-H02 is typically used for nuclear plant condenser tubes, power plant heat exchangers and marine piping. In short: nuclear-grade 90/10 cupronickel; tighter Fe/Mn than C70600; excellent seawater weldability.
What is the yield strength of C70620-H02?
C70620-H02 has a typical yield strength of 360 MPa (52.2 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 74% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C70620-H02 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of copper alloy grades). Gummy and work-hardening — rate ≈20 % of free-cutting brass; use sharp positive-rake carbide, moderate speed, heavy feed and generous coolant to avoid built-up edge.
Can C70620-H02 be welded?
Yes — weldability is rated very good (82/100). Designed for welding: GTAW/GMAW with C7158 (65/35 Cu-Ni) filler, no preheat, low interpass temperature, argon back-purge; keep joints oil- and sulphur-free to avoid hot cracking.
What surface finishes work on C70620-H02?
Not anodizable; pickle in sulphuric/hydrogen-peroxide or inhibited nitric to remove weld oxide, then form the protective film with clean-water commissioning (or FeSO₄ dosing); takes a good mechanical or electro-polish.
Can C70620-H02 be formed, bent or molded?
Excellent cold formability in O60 (deep drawing, U-bending, expansion); work-hardens fast, so interstage anneal at 700–850 °C with rapid cooling; hot work 850–950 °C.
What is the maximum service temperature of C70620-H02?
C70620-H02 is rated for continuous use to about 260°C (500 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C70620-O60 and C70620-H08?
O60 is the default condition — standard condition for condenser/heat-exchanger tube, U-bends and cold-formed parts; maximum ductility and best corrosion consistency. H08: maximum cold-worked strength for springy strip, clips and diaphragms in marine/condensate environments. Yield strength is 120 MPa in O60 versus 485 MPa in H08.
Sources
- ASTM B466/B466M – Seamless Copper-Nickel Pipe and Tube — ASTM International (2020)
- ASTM B111/B111M – Copper and Copper-Alloy Seamless Condenser Tubes — ASTM International (2021)
- ASTM B171 / B402 – Cu-Ni plate and sheet for condensers — ASTM International (2018)
- CDA alloy datasheet C70600 / C70620 (UNS registration) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties of Copper and Copper Alloys — ASM International (1990)
- Copper-Nickel Alloys for Seawater Systems (technical guide) — Copper Development Association / Nickel Institute (2019)
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.