Copper Nickel 70/30, C71500, is a 70% copper and 30% nickel alloy with good workability and corrosion resistance. C71500 is a highly corrosion resistant material used in plate, sheet, pipe, and tube forms. The alloy is versatile and durable, used in heat exchangers, fire resistant applications, and shipbuilding components.
c71500 vs c70600 chemical composition (ASTM B122)
| Element | C71500 (70/30) | C70600 (90/10) |
|---|---|---|
| Copper (Cu) | Nominal 70% | Nominal 90% |
| Nickel (Ni) | 29 – 33% | 9.0 – 11.0% |
| Lead (Pb) | 0.05% max | 0.05% max |
| Iron (Fe) | 0.40 – 1.0 | 1.0 – 1.8 |
| Zinc (Zn) | 1.0% max | 1.0% max |
| Manganese (Mn) | 1.0% max | 1.0% max |
c71500 mechanical properties (tensile strength MPa)
| Temper | C71500 (70/30) | C70600 (90/10) |
|---|---|---|
| As hot rolled | 310 – 450 | 275 – 425 |
| 1/4 Hard | 400 – 495 | 350 – 460 |
| 1/2 Hard | 455 – 550 | 400 – 495 |
| Hard | 515 – 605 | 490 – 570 |
| Extra Hard | 550 – 635 | 505 – 585 |
| Spring | 580 – 650 | 540 – 605 |
c71500 applicable ASTM specifications
| Standard | Description |
|---|---|
| ASTM B111 | Copper and Copper Alloy Seamless Condenser Tubes and Ferrule Stock |
| ASTM B122 | Copper-Nickel Alloy Plate, Sheet, Strip and Rolled Bar |
| ASTM B151 | Copper-Nickel Alloy Rod and Bar |
| ASTM B171 | Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers, and Heat Exchangers |
| ASTM B466 | Seamless Copper-Nickel Pipe and Tube |
c71500 applications
Heat exchangers
Tube plates for heat exchangers
Welded tube
Shipbuilding components
High temperature operation applications
Seawater corrosion resistant applications
FAQ
Q1: C71500 vs C70600 – which one has higher tensile strength?
C71500 has higher tensile strength across all tempers compared to C70600. In as hot rolled condition, C71500 ranges 310-450 MPa vs C70600 275-425 MPa. In spring temper, C71500 ranges 580-650 MPa vs C70600 540-605 MPa. The higher nickel content (29-33% vs 9-11%) gives C71500 superior mechanical properties.
Q2: What ASTM standards cover C71500 plate and sheet?
ASTM B122 covers C71500 plate, sheet, strip, and rolled bar. ASTM B171 covers plate and sheet for pressure vessels, condensers, and heat exchangers. For pipe and tube, ASTM B111 and ASTM B466 apply. For rod and bar, ASTM B151 applies.
Q3: What is the chemical composition difference between C71500 and C70600?
C71500 contains 29-33% nickel (nominal 70% copper); C70600 contains 9-11% nickel (nominal 90% copper). C71500 has 0.40-1.0% iron; C70600 has 1.0-1.8% iron. Both have lead max 0.05%, zinc max 1.0%, manganese max 1.0%. Higher nickel content gives C71500 better corrosion resistance and higher strength.
Q4: What tempers are available for C71500?
As hot rolled, 1/4 Hard, 1/2 Hard, Hard, Extra Hard, and Spring. Tensile strength increases with each temper. As hot rolled ranges 310-450 MPa. Spring temper ranges 580-650 MPa. Higher hardness tempers provide greater strength but reduced ductility.
Q5: Is C71500 durable for high temperature operation?
Yes, C71500 is durable for relatively high temperature operation. The JIS specification notes this as a key characteristic. The alloy maintains good mechanical properties at elevated temperatures, making it suitable for heat exchangers and other high-temperature applications.
Q6: What is the difference between ASTM B111, B122, B151, B171, and B466 for C71500?
ASTM B111 covers seamless condenser tubes. ASTM B122 covers plate, sheet, strip, and rolled bar. ASTM B151 covers rod and bar. ASTM B171 covers plate and sheet for pressure vessels, condensers, and heat exchangers. ASTM B466 covers seamless pipe and tube. Choose the standard based on the product form required.
Q7: What product forms is C71500 available in?
Plate, sheet, pipe, tube, strip, rolled bar, and rod. ASTM B122 covers plate, sheet, strip, and rolled bar. ASTM B151 covers rod and bar. ASTM B111 and B466 cover tube and pipe.
Q8: What is C71500 used for in JIS standards?
C71500 is used for applications requiring good corrosion resistance against sea water, durability for relatively high temperature operation, tube plates for heat exchangers, and welded tube. This is stated in the JIS H3100 specification.
Q9: What are the mechanical properties of C71500 in 1/2 Hard temper?
1/2 Hard C71500 has tensile strength of 455-550 MPa. This is higher than C70600 1/2 Hard which ranges 400-495 MPa. For applications requiring moderate strength with good formability, 1/2 Hard temper is commonly specified.
Q10: What is the nickel content of C71500?
C71500 contains 29-33% nickel with nominal 70% copper. This high nickel content provides excellent corrosion resistance, especially against sea water. The remainder is copper with small additions of iron (0.40-1.0%) and manganese (1.0% max).
Quality Control for C71500 Copper Pipe
Chemical verification: Per ASTM B122, B151, B171, B466 requirements: Ni 29-33%, Fe 0.40-1.0%, Mn 1.0% max, Pb 0.05% max, Zn 1.0% max, Cu remainder.
Mechanical testing: Tensile strength tested per temper: as hot rolled (310-450 MPa), 1/4 Hard (400-495 MPa), 1/2 Hard (455-550 MPa), Hard (515-605 MPa), Extra Hard (550-635 MPa), Spring (580-650 MPa).
Hardness testing: Verified per temper requirements.
Flattening test (tube): Ensures ductility for tube forming. No cracks when flattened to specified percentage of OD.
Hydrostatic testing: Each pipe pressure tested per ASTM B466.
Eddy current testing: When specified, per ASTM E243 for non-destructive testing.
Dimensional inspection: OD, wall thickness, length checked per ASTM B466 / B111 tolerances.
Traceability: All test reports linked to heat numbers. Third-party inspection available.
Packaging for C71500 Copper Pipe
Bundling: C71500 copper pipes are formed into hexagonal bundles with steel straps every 1.5 meters. Plywood separators between each layer prevent surface scratching.
End protection: Plastic caps on both ends of each pipe keep debris out and protect beveled ends.
Bundle weight: Maximum 2000 kg (4400 lbs) per bundle for safe handling.
Cut length packaging: Shorter pipes are packed into ISPM-15 certified wooden crates with foam lining.
Coiled pipe packaging: Long continuous lengths are wound onto steel reels. Reel flange marked with heat number, size, and total length.
Labels on every bundle: Alloy (C71500 70/30), heat number, OD × wall thickness, length, quantity, PO number, net weight, gross weight.
Sea freight protection: Desiccant bags placed inside moisture-barrier plastic liner for tropical destinations or storage exceeding 6 months.
Factory Equipment for C71500 Copper Pipe
| Equipment | Specification | Purpose |
|---|---|---|
| Induction melting furnace | 6 ton capacity, argon stirring | Precise control of Ni 29-33%, Fe 0.40-1.0%, Cu balance |
| Horizontal continuous caster | 200 mm billet diameter | Casts solid billet for pipe extrusion |
| Extrusion press | 3500 ton capacity | Pierces billet to form hollow pipe shell |
| Cold pilger mill | Multiple stands, up to 40 m length | Reduces OD and wall thickness, can reduce OD by up to 75% |
| Draw bench | 30 ton and 60 ton capacities | Final sizing, achieves straightness of 0.5 mm/m |
| Annealing furnace | 650-815°C (1200-1500°F), water quench | Produces annealed temper, restores ductility and corrosion resistance |
| Stress relieving furnace | Lower temperature range | Produces 1/4 Hard, 1/2 Hard, Hard, Extra Hard, Spring tempers |
| Tube straightening machine | 6-roll rotary | Corrects bending, achieves straightness of 0.5 mm/m |
| Eddy current tester | 100% online, rotating probe | Detects pinholes, slivers, wall variations, marks rejects with spray paint |
| Hydrostatic tester | Pressure up to 6000 psi | Leak tests each pipe, holds pressure for minimum 5 seconds |
| Metallurgical lab | OES spectrometer, tensile tester, hardness tester, microscopes | Verifies chemical composition and mechanical properties |
