The C71500 COPPER NICKEL "70/30" alloy is the corrosion resistant alloy mainly used in salt water environment. The alloy is the combination of nickel, iron and manganese that helps in maintaining good corrosion resistance and is commonly used in valves, and pump components.
Applications
Industrial Applications:
Pump Impellers, Heat Exchanger Tubes, Evaporator Tubes, Distiller Tubes, Condenser Plates, Refrigerators, Process Equipment, Condenser Components, Ferrules, Welding Backing Rings, Flexible Metal Hose, Weld Wire, Boiler Parts, Condensers, Propeller Sleeves, Heat Exchanger Components
Marine Applications:
Salt Water Flanges, Salt Water Piping, Valve Bodies, Sea Water Service, Fittings, Sea Water Condensers, Salt Water Pipe Fittings, Water Boxes – Salt Water Applications, Pump Bodies and Internal Parts-Sea Water
Specifications
| End Product | Specification |
|---|---|
| Bar | ASTM B122, B151, MILITARY MIL-C-15726, SAE J461, J463 |
| Bolts | ASTM F468 |
| Electrode, Welding | AWS A5.6, MILITARY MIL-E-22200/4 |
| Nuts | ASTM F467 |
| Pipe, Seamless | ASME SB466, ASTM B466 |
| Pipe, Welded | ASTM B608, B467 |
| Plate | ASTM B122, MILITARY MIL-C-15726, SAE J461, J463 |
| Plate, Clad | ASTM B432 |
| Plate, Condenser Tube | ASME SB171, ASTM B171, SAE J463, J461 |
| Rod | ASTM B151, MILITARY MIL-C-15726 |
| Screws | ASTM F468 |
| Sheet | ASTM B122, MILITARY MIL-C-15726, SAE J463, J461 |
| Strip | ASTM B122, MILITARY MIL-C-15726, SAE J461, J463 |
| Studs | ASTM F468 |
| Tube, Condenser | ASME SB111, ASTM B552, B111, MILITARY MIL-T-15005, SAE J463, J461 |
| Tube, Finned | ASME SB359, ASTM B359, MILITARY MIL-T-22214 |
| Tube, Seamless | ASME SB466, ASTM B466, MILITARY MIL-T-16420 |
| Tube, U-Bend | ASME SB395, ASTM B395 |
| Tube, Welded | ASME SB543, ASTM B543 |
| Wire | MILITARY MIL-C-15726 |
c71500 chemical composition
| Element | Cu | Fe | Pb | Mn | Ni | Zn |
|---|---|---|---|---|---|---|
| Min/Max | Rem | 0.40 – 1.0 | 0.05 | 1 | 29.0 – 33.0 | 1 |
| Nominals | 69.5 | 0.5 | – | – | 30 | – |
Fabrication
| Joining Technique | Suitability |
|---|---|
| Brazing | Excellent |
| Butt Weld | Excellent |
| Capacity for Being Cold Worked | Good |
| Capacity for Being Hot Formed | Good |
| Coated Metal Arc Welding | Excellent |
| Gas Shielded Arc Welding | Excellent |
| Machinability Rating | 20 |
| Oxyacetylene Welding | Good |
| Seam Weld | Excellent |
| Soldering | Excellent |
| Spot Weld | Excellent |
c71500 density and physical properties
c71500 density = 0.323 lb/in³ at 68°F (8.94 g/cm³ at 20°C).
| Product Property | US Customary | Metric |
|---|---|---|
| Density | 0.323 lb/in³ at 68°F | 8.94 g/cm³ at 20°C |
| Coefficient of Thermal Expansion | 9.0 × 10⁻⁶ per °F (68-572°F) | 16.2 × 10⁻⁶ per °C (20-300°C) |
| Electrical Conductivity | 4% IACS at 68°F | 0.027 MegaSiemens/cm at 20°C |
| Electrical Resistivity | 225.0 ohms-cmil/ft at 68°F | 37.4 microhm-cm at 20°C |
| Melting Point – Liquidus | 2260°F | 1238°C |
| Melting Point – Solidus | 2140°F | 1171°C |
| Modulus of Elasticity in Tension | 22,000 ksi | 152,000 MPa |
| Modulus of Rigidity | 8,300 ksi | 57,230 MPa |
| Specific Gravity | 8.94 | 8.94 |
| Specific Heat Capacity | 0.09 Btu/lb/°F at 68°F | 377.1 J/kg·K at 293 K |
| Thermal Conductivity | 17.0 Btu·ft/(hr·ft²·°F) at 68°F | 29.4 W/m·K at 20°C |
Sizes Available
| Product Form | Size Range |
|---|---|
| Hollow Rods | Min Bore Size 20 mm and Max OD 100 mm |
| Round Rods | 8 mm To 100 mm |
| Hex | 10 mm To 60 mm |
| Square | 10 mm To 60 mm |
| Flat | 10 mm Min Thickness and max Width 120 mm |
| Billets | Up to 200 mm |
| Ingots | As per Specification |
FAQ
Q1: What is the difference between C71500 and C70600 copper nickel?
C71500 has higher strength and better corrosion resistance than C70600. C71500 (70/30) contains 29-33% nickel for enhanced mechanical properties. C70600 (90/10) contains 9-11% nickel with lower strength. For salt water piping, valve bodies, and high-velocity seawater applications, choose C71500. For general marine use, C70600 is more economical.
Q2: What ASTM standards cover C71500 seamless pipe?
ASTM B466 and ASME SB466 cover C71500 seamless pipe. For welded pipe, ASTM B608 and B467 apply. For condenser tube, ASTM B111 and ASME SB111 apply. Military specifications include MIL-T-16420 for seamless tube and MIL-T-15005 for condenser tube.
Q3: What is the density of C71500 material for weight calculation?
C71500 density is 0.323 lb/in³ (8.94 g/cm³). For pipe weight calculation: (OD - wall) × wall × 10.68 = lb/ft. This density contributes to the alloy's durability and pressure tightness.
Q4: What is the machinability rating of 70/30 copper nickel?
Machinability rating is 20 (free-cutting brass = 100). The page shows machinability rating of 20. For complex machined components like valve bodies and pump impellers, consider ordering finished parts rather than machining bar stock in-house.
Q5: What welding methods are suitable for C71500?
Gas shielded arc welding, coated metal arc welding, butt weld, seam weld, and spot weld are all Excellent. Brazing and soldering are Excellent. Oxyacetylene welding is Good. For seawater piping, use TIG welding with ERNi-7 filler metal and argon back-purge.
Q6: What are the available sizes for C71500 round rods?
Round rods from 8 mm to 100 mm diameter. Other sizes available: hollow rods (min bore 20 mm, max OD 100 mm), hex (10-60 mm), square (10-60 mm), flat (min thickness 10 mm, max width 120 mm), billets (up to 200 mm).
Q7: What are the applications of C71500 in marine environments?
Salt water flanges, salt water piping, valve bodies, seawater service fittings, seawater condensers, water boxes, pump bodies and internal parts. The page lists these marine applications. The alloy's combination of nickel, iron and manganese provides good corrosion resistance in salt water.
Q8: What are the industrial applications of C71500?
Pump impellers, heat exchanger tubes, evaporator tubes, distiller tubes, condenser plates, refrigerators, process equipment, boiler parts, condensers, propeller sleeves. The page lists these industrial applications.
Q9: What is the melting point of C71500?
Solidus: 2140°F (1171°C), Liquidus: 2260°F (1238°C). Hot forming capacity is Good. For hot working, temperatures should be above solidus but below liquidus.
Q10: What fasteners specifications apply to C71500?
ASTM F468 for bolts, screws, and studs; ASTM F467 for nuts. The page lists these fastener specifications. For military applications, MIL-C-15726 applies to bar, rod, sheet, plate, strip, and wire.
Detection & Quality Control
| Test Method | Purpose | Acceptance Criteria |
|---|---|---|
| Optical Emission Spectrometry | Verify c71500 chemical composition | Ni 29-33%, Fe 0.40-1.0%, Cu rem |
| Tensile Test | Confirm c71500 mechanical properties | Per ASTM B466 specification |
| Flattening Test | Ductility for tube forming | No cracks when flattened |
| Hardness Test | Uniformity of temper | Per specification |
| Dimensional Check | OD, wall, length | Per ASTM B466 tolerances |
| Hydrostatic Test | Leak tightness | Per specification |
| Eddy Current Test (when specified) | Detect pits and wall variations | Per ASTM E243 |
Packaging
c71500 copper pipe is packaged to prevent damage during transit:
| Packaging Type | Details |
|---|---|
| Hexagonal bundles | Steel straps, plywood separators, plastic end caps. Max bundle weight 2000 kg. |
| Wooden crates | ISPM-15 certified, foam-lined for finished components. |
| Steel reels | For coiled tube. Marked with heat number, size, length. |
Marking per bundle: Alloy (C71500 / 70/30), heat number, size, length, quantity, PO number, net/gross weight.
Moisture protection: Desiccant bags for tropical or long-term storage.
Factory Equipment
| Equipment | Role in C71500 Pipe Production |
|---|---|
| Induction melting furnaces | Precise control of Ni 29-33%, Fe 0.40-1.0%, Cu balance |
| Continuous casting | Produces billet (up to 200 mm) and ingots |
| Extrusion press | Produces hollow rods, pipe, tube shells |
| Cold pilger mills | Reduces OD and wall thickness |
| Draw benches | Final sizing, smooth finish |
| Annealing furnaces | Softening after cold work |
| Straightening machines | Achieves straightness |
| Hydrostatic testers | Pressure testing |
| Metallurgical lab | OES, tensile, hardness verification |
Our Full Product Range
| Product Form | Common Standards | Size Range | Typical Applications |
|---|---|---|---|
| Copper Pipe & Tube (Seamless) | ASTM B466, ASME SB466, MIL-T-16420 | Per ASTM standard | Salt water piping, seawater service, condenser tubes |
| Copper Pipe (Welded) | ASTM B608, B467 | Per ASTM standard | Lower cost alternative for non-critical lines |
| Copper Rod & Bar | ASTM B122, B151, MIL-C-15726, SAE J461, J463 | Round: 8-100 mm; Hex: 10-60 mm; Square: 10-60 mm; Flat: 10 mm min thickness, 120 mm max width | Valve bodies, pump shafts, fasteners, bolts, nuts, screws, studs |
| Copper Hollow Rods | Per extrusion standard | Min bore 20 mm, Max OD 100 mm | Hydraulic cylinders, sleeve bearings |
| Copper Billets & Ingots | As per specification | Billets: up to 200 mm | For further processing |
| Copper Sheet & Plate | ASTM B122, ASME SB171, MIL-C-15726, SAE J461, J463 | Per ASTM standard | Condenser plates, water boxes, tube sheets |
| Copper Strip | ASTM B122, MIL-C-15726, SAE J461, J463 | Per ASTM standard | Finned tube base, gaskets |
| Copper Wire | MIL-C-15726 | Per MIL standard | Welding filler wire, fasteners |
| Finned Tube | ASME SB359, ASTM B359, MIL-T-22214 | Per ASTM standard | Enhanced heat transfer |
| U-Bend Tube | ASME SB395, ASTM B395 | Per ASTM standard | Floating head heat exchangers |
| Clad Plate | ASTM B432 | Per ASTM standard | Corrosion-resistant surface on structural steel |
| Welding Electrode | AWS A5.6, MIL-E-22200/4 | Standard welding sizes | Welding C71500 and similar alloys |
| CNC Machined Components (service) | Custom drawing | Custom tolerances | Valve bodies, pump housings, impellers, custom fittings |
