c71500 copper nickel
c71500 copper nickel (70/30) is available in:
Sheet / Plate / Strip
Round Bar / Rod
Pipe / Tube
Fittings (Threaded and Socketweld, 3000#/6000#)
Flanges (Slip-on, threaded, blind, weldneck)
This copper nickel 70/30 offers moderate strength, workability, formability, and weldability.
Small iron content (up to 0.5%) delivers extraordinary resistance to general corrosion and stress corrosion cracking. The alloy is best applied in high temperatures, high pressure, high velocity, and destructive turbulence.
Applications: Condensers, seawater piping, power plants, exchanger shells, marine, industrial.
c71500 copper pipe and tube – complete size range
c71500 copper pipe available sizes:
| Product | Size Range |
|---|---|
| Round Bar | 1/2" dia to 10-1/8" |
| Plate | 3/16" thick to 2-5/8" |
| Sheet/Strip | .065", .125" |
| Tube | 3/8" OD to 1" |
| Pipe (Standard sch 40) | 1/4" to 12" |
| Pipe (Extra Heavy sch 80) | 1/4" to 4" |
| Pipe (Class 200 MIL-T-16420K) | 1/2" to 12" |
| Fittings | 3000#/6000# (Threaded and Socketweld) |
| Flanges | Slip-on, threaded, blind, weldneck |
c71500 chemical composition
| Element | Cu | Pb | Zn | Fe | Ni | Mn |
|---|---|---|---|---|---|---|
| Min % | Rem | - | - | 0.4 | 29 | - |
| Max % | Rem | 0.05 | 1 | 1 | 33 | 1 |
Why iron matters: The 0.4-1.0% iron content gives c71500 copper nickel its extraordinary resistance to general corrosion and stress corrosion cracking. Without iron, 70/30 cupronickel loses its marine-grade performance.
c71500 density and physical properties
c71500 density = 0.323 lb/in³ at 68°F (8.94 g/cm³).
| Property | Value (Imperial) |
|---|---|
| Melting Point – Liquidus | 2260°F |
| Melting Point – Solidus | 2140°F |
| Density | 0.323 lb/in³ |
| Specific Gravity | 8.94 |
| Electrical Conductivity | 4.6% IACS at 68°F |
| Thermal Conductivity | 17 Btu/(sq ft·ft·hr·°F) at 68°F |
| Thermal Expansion (68-572°F) | 9 × 10⁻⁶ /°F |
| Modulus of Elasticity (Tension) | 22,000 ksi |
| Modulus of Rigidity | 8,300 ksi |
70/30 copper nickel machinability – rating 20
70/30 copper nickel machinability rating is 20 (free-cutting brass = 100).
| Fabrication Method | Suitability |
|---|---|
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Excellent |
| Coated Metal Arc Welding | Excellent |
| Spot / Seam / Butt Weld | Excellent |
| Cold Forming | Good |
| Hot Forming | Good |
c71500 mechanical properties
c71500 mechanical properties by form and temper:
| Form | Temper | Tensile (ksi) | Yield (ksi) | Elong (%) | Hardness |
|---|---|---|---|---|---|
| Round Bar | H02 | 75 | 70 | 15 | 80 HRB |
| Plate/Sheet/Strip | M20 | 55 | 20 | 45 | 35 HRB |
| Tube | OS025 | 60 | 25 | 45 | 45 HRB / 80 HRF |
| Tube | OS035 | 54 | - | 45 | 36 HRF |
Equivalent specifications for c71500 copper nickel
c71500 material is available to the following standards:
| ASTM | ASME | Military | Other |
|---|---|---|---|
| B111, B122, B151, B171, B432, B466, B467, B552, B956 | SB111, SB151, SB171, SB359, SB395, SB466, SB467, SB543 | MILT-15005, MIL-C-15726, MIL-C-1726F, MIL-C-24679, MIL-T-16420K, MIL-T-22214 | DIN 2.0872, BS 2871 CN102, EN CW352H, SAE J461, SAE J463 |
FAQ
Q1: Can C71500 be used for high-velocity seawater piping?
Yes, C71500 is specifically designed for high-velocity seawater. The alloy finds its greatest application in areas of "high velocity and destructive turbulence." With 30% nickel and 0.4-1.0% iron, C71500 handles seawater flow up to 4-5 m/s. Use C71500 for condenser inlet rows, turbulent pipe runs, and naval seawater systems.
Q2: What sizes of C71500 copper pipe are available?
C71500 copper pipe is available from 1/4" to 12" in schedule 40, and 1/4" to 4" in schedule 80. Class 200 pipe per MIL-T-16420K is available from 1/2" to 12". Tube sizes range from 3/8" to 1" OD. Fittings (3000#/6000#) and flanges (slip-on, threaded, blind, weldneck) are also available.
Q3: What is the density of C71500 material for weight calculation?
C71500 density is 0.323 lb/in³ at 68°F. For pipe weight: (OD - wall) × wall × 10.68 = lb/ft. Example: 1" OD × 0.065" wall C71500 copper pipe = approximately 0.65 lb/ft. For 1" thick plate: 46.5 lb per square foot.
Q4: Why does C71500 contain iron? Does it matter?
Yes, C71500 requires 0.4-1.0% iron for corrosion resistance. The small iron content gives extraordinary resistance to general corrosion and stress corrosion cracking. Without sufficient iron, 70/30 cupronickel loses its marine-grade performance. Always verify iron content on the mill test certificate.
Q5: What is the machinability rating of 70/30 copper nickel?
Machinability rating is 20 (free-cutting brass = 100). For H02 temper round bar, tensile is 75 ksi and yield is 70 ksi – this harder temper machines better than annealed. Use sharp carbide tooling, low speeds, and abundant coolant.
Q6: What welding methods work for C71500 copper nickel?
Gas shielded arc welding (TIG/MIG), coated metal arc welding (MMA), spot, seam, and butt welding are all rated "Excellent". Oxyacetylene welding is "Good". Soldering and brazing are also "Excellent". For seawater pipe, use ERNi-7 filler metal and argon back-purge.
Q7: What is the difference between C71500 tube tempers OS025 and OS035?
OS025 has higher strength (60 ksi tensile, 25 ksi yield); OS035 is softer (54 ksi tensile) with same 45% elongation. OS035 is fully annealed – best for bending, flaring, and tube expansion. OS025 is light drawn – suitable for straight pipe runs requiring some strength.
Q8: What applications use C71500 plate and sheet?
C71500 plate and sheet are used for exchanger shells, baffle plates, and tube sheets. M20 temper plate/sheet has 55 ksi tensile, 20 ksi yield, and 45% elongation – suitable for forming into shells. Thickness range: 3/16" to 2-5/8" for plate; .065" and .125" for sheet/strip.
Q9: What military specifications cover C71500?
MILT-15005 (tube), MIL-C-15726 (general), MIL-T-16420K (pipe), MIL-T-22214 (finned tube), and MIL-C-24679. For naval shipbuilding, specify the correct MIL spec for your product form. MIL-T-16420K Class 200 pipe is available from 1/2" to 12".
Q10: How does C71500 perform at high temperatures?
C71500 is applicable in high temperatures combined with high pressure and high velocity. The melting point is 2140-2260°F. For continuous service, C71500 retains good mechanical properties up to 350°C (662°F). For power plant condensers and heat exchangers in the 200-300°C range, C71500 is a proven material.
Detection & Quality Control
| Test Method | Purpose | Acceptance Criteria |
|---|---|---|
| Optical Emission Spectrometry | Verify c71500 chemical composition | Ni 29-33%, Fe 0.4-1.0%, Cu balance, Mn ≤1%, Pb ≤0.05%, Zn ≤1% |
| Tensile Test | Confirm c71500 mechanical properties | OS035 tube: UTS ≥54 ksi, Elong ≥45%; OS025 tube: UTS ≥60 ksi, Elong ≥45% |
| Flattening Test (tube) | Ductility for forming | No cracks when flattened to specified % of OD |
| Hardness Test | Uniformity of temper | OS035 ~36 HRF, OS025 ~45 HRB / 80 HRF |
| Dimensional Check | OD, wall, length | Per ASTM B111 / B466 tolerances |
| Eddy Current Test (when specified) | Detect pits and wall variations | Per ASTM E243 |
| Hydrostatic Test (when specified) | Leak tightness | Per ASTM / MIL spec requirements |
Packaging
C71500 copper pipe is packaged to prevent damage during transit:
| Packaging Type | Length Range | Details |
|---|---|---|
| Hexagonal bundles | 12 – 24 ft (typical) | Steel straps, plywood separators between layers, plastic end caps. Max bundle weight 2000 kg. |
| Wooden crates | Cut lengths, fittings, flanges | ISPM-15 certified, foam-lined for finished components. |
| Steel reels | Coiled tube | For continuous lengths. Reel marked with heat number, size, and length. |
| Individual sleeving | Polished or precision tube | VCI paper or plastic sleeving for surface protection. |
Marking per bundle: Alloy (C71500 / 70/30), heat number, size (OD × wall), length, quantity, PO number, net/gross weight.
Moisture protection: Desiccant bags added for tropical or long-term storage shipments.
Factory Equipment
| Equipment | Role in C71500 Pipe Production |
|---|---|
| Induction melting furnaces | Precise control of Ni (29-33%), Fe (0.4-1.0%), Mn (≤1%) |
| Horizontal continuous caster | Produces solid billet |
| Extrusion press | Pierces billet to hollow shell |
| Cold pilger mills | Reduces OD and wall thickness |
| Draw benches | Final sizing, smooth ID finish |
| Annealing furnaces (650-850°C) | Softening to OS035 or OS025 temper |
| Straightening machines | Achieves straightness per ASTM spec |
| Eddy current / Hydrostatic testers | Non-destructive and pressure testing |
| Metallurgical lab | OES, tensile, hardness verification |
Our Full Product Range
| Product Form | Common Standards | Typical Alloy Grades | Size Range | Typical Applications |
|---|---|---|---|---|
| Seamless Copper Pipe | ASTM B466, ASME SB466, MIL-T-16420K | C71500, C70600, C12200 | 1/4" to 12" sch 40; 1/4" to 4" sch 80; Class 200 1/2"-12" | Seawater piping, power plants, hydraulic lines, fire mains |
| Seamless Copper Tube | ASTM B111, ASME SB111, MILT-15005 | C71500, C70600, C12200, C68700 | 3/8" to 1" OD | Condensers, heat exchangers |
| Copper Round Bar / Rod | ASTM B151, MIL-C-15726, SAE J461/J463 | C71500, C70600, C36000, C46400, C63000 | 1/2" to 10-1/8" diameter | Valve stems, pump shafts, machined components |
| Copper Plate | ASTM B122, B171, SAE J461/J463 | C71500, C70600, C46400, C63000 | 3/16" to 2-5/8" thick | Exchanger shells, tube sheets, baffle plates |
| Copper Sheet / Strip | ASTM B122, MIL-C-15726 | C71500, C70600, C11000 | .065", .125" thick | Cladding, gaskets, forming |
| Pipe Fittings | Threaded / Socketweld, 3000#/6000# | C71500, C96400 | All standard sizes | Seawater piping connections |
| Pipe Flanges | Slip-on, threaded, blind, weldneck | C71500 | All standard sizes | Seawater piping connections |
| CNC Machined Components (service available) | Custom drawing | C71500, C70600, C36000, C63000, C17200 | Custom tolerances | Valve bodies, pump housings, custom fittings |
