Cupro Nickel 90/10 Tubes (UNS C70600)
| Standard | Symbol |
|---|---|
| ASTM B111 | C70600 |
| BS 2871 Part 3 | CN 102 |
| EN 12451 | CuNi10 Fe 1Mn |
| NFA51 102 | CuNi10 Fe1Mn |
| JIS H 3300 | C 7060 |
| EEMUA Pub 144 1987 | C7060X |
| NES 779 Part 3 | 90/10 CuNi |
Guide to Selection of Tube Materials (90/10):
Seawater with dissolved salts from 1500 to 3000 ppm
Suspended solids more than 25 ppm
H2S or Ammonia less than 1 ppm
Permissible average water velocity: 3.0 – 4.0 meters/second
Cupro Nickel 70/30 Tubes (UNS C71500)
| Standard | Symbol |
|---|---|
| ASTM B111 | C71500 |
| BS 2871 part 3 | CN 107 |
| EN 12451 | CuNi30 Fe 1Mn |
| NFA 51 102 | CuNi30 Fe 1Mn |
| JIS H 3300 | C 7150 |
Guide to Selection of Tube Materials (70/30):
Seawater with dissolved salts more than 10,000 ppm
Presence of abrasive suspended solids
Polluted with H2S and Ammonia
Permissible average water velocity: 3.0 – 4.0 meters/second
Product Applications
| Application Area | Recommended Alloy |
|---|---|
| Chillers | 90/10 |
| Heat Exchangers & Condensers | 90/10 or 70/30 |
| Power Plants (High Capacity) | 70/30 |
| Refineries | 90/10 |
| Desalination Plants | 90/10 |
| Ship Building & Ship Repairs | 90/10 or 70/30 |
| Distiller Tubes & Evaporators | 70/30 |
| Ferrules | 70/30 |
| Defense | 90/10 or 70/30 |
Special Application: Automotive Brake Tubing (90/10 Copper Nickel)
Copper-nickel alloy C70600 is used for brake tubing. It typically contains 10% nickel, with iron (1.4%) and manganese (0.8%) additions.
Standards & Properties:
Conforms to ASTM B466 (dimensions, tensile strength, yield strength)
Meets SAE J527, ASTM A254, ISO 4038, and SAE J1047
Excellent formability allows ease of flaring and bending
Corrosion Resistance:
In salt spray testing over 180 days, steel's burst strength decreases significantly while copper-nickel remains consistently resistant
In a moist, salty mudpack test for six months, brazed steel perforated while copper-nickel tubing showed only superficial general corrosion
Easily exceeds the required corrosion resistance of ISO 3768 (minimum burst pressure 110 MPa after 96 hours in neutral salt spray)
Cupro Nickel Tubes
Cupro Nickel Tubes C70600 (90/10 Copper Nickel)
Chemical Composition (C70600):
| Element | Percentage (%) |
|---|---|
| Copper (Cu) + Silver (Ag) | Remainder |
| Nickel (Ni) + Cobalt (Co) | 9.00 - 11.00 |
| Iron (Fe) | 1.00 - 1.80 |
| Manganese (Mn) | 1.00 Max. |
| Zinc (Zn) | 1.00 Max. |
| Lead (Pb) | 0.05 Max. |
Mechanical Properties – Light Drawn (C70600 Tube):
| Property | Value |
|---|---|
| Tensile Strength (UTS) | 45.00 ksi Min. |
| Yield Strength (0.5% Ext.) | 35.00 ksi Min. |
| Flattening Test | Required (after 'O') |
| Expansion Test | 30% at 60° (after 'O') |
Mechanical Properties – Annealed Temper (C70600 Tube):
| Property | Value |
|---|---|
| Tensile Strength (UTS) | 40.00 ksi Min. |
| Yield Strength (0.5% Ext.) | 15.00 ksi Min. |
| Grain Size (75X mm Avg.) | 0.010 – 0.045 |
| Flattening Test | Required |
| Expansion Test | 30% at 60° |
Cupro Nickel Tubes C71500 (70/30 Copper Nickel)
Chemical Composition (C71500):
| Element | Percentage (%) |
|---|---|
| Copper (Cu) | ~ 69.0 |
| Nickel (Ni) + Cobalt (Co) | 29.0 - 33.0 |
| Iron (Fe) | 0.4 - 1.0 |
| Manganese (Mn) | 1.00 Max. |
| Lead (Pb) | 0.05 Max. |
Mechanical Properties – Annealed Temper (C71500 Tube):
| Property | Value |
|---|---|
| Tensile Strength (UTS) | 275 MPa (40.00 ksi) Min. |
| Yield Strength (0.5% Ext.) | 105 MPa (15.00 ksi) Min. |
| Elongation | 40% Min. |
Detection
Standard quality control for C71500 copper pipe, ASTM B111 C70600, and copper nickel 70/30 products includes:
Flattening Test (Required after temper)
Expansion Test (30% at 60°)
Grain Size Analysis (75X magnification)
Tensile Strength & Yield Strength Testing
Chemical Composition Verification (via spectrometer)
Bend Test (180° close for 95/5 rods)
Packaging
To ensure sb111 c71500 and asme sb111 c715 material arrives in perfect condition:
Waterproof Paper inner wrapping
Plastic bag sealed with moisture absorbent
Wooden cases or spools for coils
End caps on each pipe to prevent debris entry
Clear labeling with alloy, standard, heat number, and dimensions
Factory Equipment
Production of Copper Nickel Alloy UNS C71500 and c71500 copper nickel involves:
Induction Melting Furnaces (for precise c71500 chemical composition control)
Continuous Casting Machines
Extrusion Press (for solid and hollow billets)
Cold Pilger Mills & Draw Benches
Annealing Furnaces (controlled atmosphere)
Straightening Machines & Cutting Equipment
Non-Destructive Testing (NDT) Lines
FAQ
1. What is the European equivalent grade for ASTM B111 C70600 material?
The European (EN) equivalent for ASTM B111 C70600 is CuNi10Fe1Mn (EN 12451). It has the same nominal composition of 90% copper and 10% nickel with iron and manganese additions.
2. How does the corrosion resistance of UNS C71500 compare to UNS C70600 in polluted seawater?
UNS C71500 (70/30 copper nickel) is preferred over UNS C70600 for polluted seawater containing hydrogen sulfide or ammonia. However, neither alloy is completely immune under severely polluted conditions.
3. What is the maximum allowable water velocity for asme sb111 c715 condenser tubes?
For asme sb111 c715 condenser tubes, the permissible average water velocity is 3.0 – 4.0 meters per second. Exceeding this range may cause impingement attack.
4. Can sb111 c71500 tube be used for automobile brake tubing?
No. sb111 c71500 is a condenser tube standard. For brake tubing, ASTM B466 for C70600 (90/10 copper nickel) is the correct specification, commonly used for automotive brake lines.
5. What is the typical grain size range for annealed C70600 tubing?
For annealed copper nickel 90/10 (C70600) tubing, the average grain size at 75X magnification is 0.010 – 0.045 mm.
6. Does Copper Nickel Alloy UNS C71500 require post-weld heat treatment?
No. Copper Nickel Alloy UNS C71500 does not require post-weld heat treatment after conventional welding methods such as GTAW/TIG.
7. What is the minimum elongation for 95/5 copper nickel strip cut from tube?
For 95/5 copper nickel, the minimum elongation at 5.65√So G.L. is 40% in the annealed condition.
8. How does the density of C71500 affect heat exchanger weight calculations?
The c71500 density is 8.94 g/cm³. This high density means c71500 copper pipe will be heavier than equivalent-sized titanium or stainless steel tubes, which is important for total heat exchanger weight budgeting.
9. What is the tensile strength requirement for light-drawn UNS C70600 tubing?
For light-drawn UNS C70600 (90/10 copper nickel) tubing, the minimum tensile strength is 45.00 ksi (approximately 310 MPa).
10. Which alloy is better for high-temperature feedwater heaters: C70600 or C71500?
Copper nickel 70/30 (C71500) is more resistant to exfoliation attack in feedwater heaters working under cyclic conditions compared to C70600. Always verify specific temperature limits with design codes.
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