Copper Alloy C70500-H02
Supply condition
UNS C70500 · ASTM B111
H02 = half hard
General-purpose flat temper balancing formability with useful yield strength for brackets, sleeves and shells.
Values for the H02 condition
Other C70500 tempers and conditions
C70500 is listed in 7 conditions; see the grade overview at C70500.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
O61Default Annealed | Standard condition for condenser and heat-exchanger tube that must be expanded/rolled into tubesheets or U-bent. | 105 | 275 | 40 | 55 HB | 25 % IACS |
Drawn and stress-relieved tube | Use where residual stress from drawing must be reduced (ammonia-bearing atmospheres, U-bend legs) while keeping drawn strength. | 190 | 305 | 28 | 72 HB | 24.5 % IACS |
Light-drawn tube | Pick when straight tube with better handling stiffness and dimensional stability is needed but some expandability must remain. | 200 | 310 | 25 | 75 HB | 24 % IACS |
Quarter hard | Flat-product temper for deep-drawn or formed parts needing more spring than fully soft strip. | 220 | 315 | 22 | 78 HB | 25 % IACS |
H02This page Half hard | General-purpose flat temper balancing formability with useful yield strength for brackets, sleeves and shells. | 280 | 350 | 14 | 92 HB | 24 % IACS |
Hard drawn | Highest-strength tube condition for pressure or structural tubing where no significant expansion or bending follows. | 350 | 400 | 8 | 105 HB | 24 % IACS |
Full hard | Choose for flat springs, clips and wear surfaces where only mild bending is required after forming. | 370 | 415 | 6 | 110 HB | 24 % IACS |
What is C70500-H02?
C70500-H02 is C70500 supplied in the H02 condition — general-purpose flat temper balancing formability with useful yield strength for brackets, sleeves and shells. C70500-H02 has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 350 MPa (50.8 ksi) — stronger than 59% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 124 GPa (18 Msi). C70500-H02 has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,090°C (1,994 °F). O61 is the default condition FabDigit quotes; H02 is available on request or by drawing note.
Advantages
- Readily welded — 78/100, better than 91% of copper alloy grades
C70500-H02 properties
Typical room-temperature values for C70500-H02; 19 are specific to this condition. Other listed values are C70500 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C70500-H02 has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,090°C (1,994 °F).
Mechanical12
C70500-H02 has a yield strength of 280 MPa (40.6 ksi) and a tensile strength of 350 MPa (50.8 ksi) — stronger than 59% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 124 GPa (18 Msi).
Thermal6
C70500-H02 is rated for continuous service to 225°C (437 °F). It conducts heat at 88 W/m·K (50.8 BTU/hr·ft·°F), better than 53% of copper alloy grades. Thermal expansion is 17.1 µm/m·K (9.5 µin/in·°F).
Electrical3
C70500-H02 conducts electricity at 24 % IACS, better than 57% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C70500-H02 takes about 60 MJ of energy and emits 4 kg of CO₂ — more than 69% of copper alloy grades. Typical recycled content is 35%.
Manufacturability6
C70500-H02's machinability is poor (28/100, worse than 78% of copper alloy grades); weldability very good (78/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C70500-H02
Is C70500 easy to machine?
Gummy and work-hardening like all cupronickels — use sharp positive-rake carbide, ~60–100 m/min, heavy feed and generous coolant to avoid built-up edge; rating only about 20 % of free-cutting brass.
Can C70500 be welded?
Readily GTAW/GMAW welded with ERCuNi (70/30) filler under argon, no preheat and no post-weld heat treatment; keep joints clean and sulphur/lead-free to avoid hot cracking, and avoid oxyacetylene.
Can C70500 be formed, bent or molded?
Excellent cold formability in O61 — bends, expands and U-bends well; interanneal near 700–800 °C for heavy reductions and stress-relieve drawn tube if ammonia exposure is expected.
What surface finishes work on C70500?
Solders and brazes easily with proper flux; not anodizable — finish by pickling/passivation, mechanical polishing or tin/nickel plating, and expect a protective brown-green patina in seawater service.
C70500 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 (may be reported as Ni+Co); nominal 2 % low-nickel cupronickel | 1.5 – 2.5 | 2 |
| Feiron addition for impingement resistance; verify exact limits against current CDA/ASTM registration | 0.1 – 1 | 0.5 |
| Mndeoxidiser / sulphur scavenger | 0 – 1 | 0.4 |
| Znimpurity limit | ≤ 0.5 | — |
| Pbimpurity limit | ≤ 0.05 | — |
| Cimpurity limit | ≤ 0.05 | — |
| Simpurity limit | ≤ 0.02 | — |
| Curemainder, approximately 96–98 % | balance | — |
C70500-H02 — frequently asked
What is C70500-H02 used for?
C70500-H02 is typically used for condenser tubing, heat exchanger tubes and low-cost marine piping. In short: cheapest cupronickel tube grade; softer than 90/10 Cu-Ni; high formability, low machinability.
What is the yield strength of C70500-H02?
C70500-H02 has a typical yield strength of 280 MPa (40.6 ksi) and a tensile strength of 350 MPa (50.8 ksi) — stronger than 59% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C70500-H02 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 78% of copper alloy grades). Gummy and work-hardening like all cupronickels — use sharp positive-rake carbide, ~60–100 m/min, heavy feed and generous coolant to avoid built-up edge; rating only about 20 % of free-cutting brass.
Can C70500-H02 be welded?
Yes — weldability is rated very good (78/100). Readily GTAW/GMAW welded with ERCuNi (70/30) filler under argon, no preheat and no post-weld heat treatment; keep joints clean and sulphur/lead-free to avoid hot cracking, and avoid oxyacetylene.
What surface finishes work on C70500-H02?
Solders and brazes easily with proper flux; not anodizable — finish by pickling/passivation, mechanical polishing or tin/nickel plating, and expect a protective brown-green patina in seawater service.
Can C70500-H02 be formed, bent or molded?
Excellent cold formability in O61 — bends, expands and U-bends well; interanneal near 700–800 °C for heavy reductions and stress-relieve drawn tube if ammonia exposure is expected.
What is the maximum service temperature of C70500-H02?
C70500-H02 is rated for continuous use to about 225°C (437 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C70500-O61 and C70500-H04?
O61 is the default condition — standard condition for condenser and heat-exchanger tube that must be expanded/rolled into tubesheets or U-bent. H04: choose for flat springs, clips and wear surfaces where only mild bending is required after forming. Yield strength is 105 MPa in O61 versus 370 MPa in H04.
Sources
- ASTM B111/B111M — Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock — ASTM International (2021)
- ASTM B543 — Welded Copper and Copper-Alloy Heat Exchanger Tube — ASTM International (2020)
- CDA/UNS Copper Alloy Property Data (C705xx copper-nickels) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Copper-Nickel Alloys: Properties and Application Guidance — Nickel Institute / CDA UK (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.