Introduction
Cu-Ni alloys have a single-phase structure throughout the complete range of compositions and many standard alloys are available with small variations in their element composition for special applications. The earliest application of Cu-Ni alloy was for marine condenser tubes and presently it has many uses. Apart from their usage in coinage and wire mesh, Cu-Ni alloys containing 10 to 30% nickel with iron and manganese additions (C70600 and C71500) are also used for marine applications.
Alloying Additions
Manganese in commercial alloys acts as a de-sulfurizer and de-oxidant. It enhances the working characteristics and anti-corrosiveness in sea-water.
Chromium can also be added instead of iron to increase strength. It is usually added in a 30% nickel casting alloy.
Iron is supplemented (up to about 2%) to the alloys used in marine applications, as it improves the alloy's strength and provides better resistance to corrosion caused by flowing seawater. Optimum compositions of the copper-nickel-iron alloys offer resistance to corrosion for materials used in making tubes, condensers and other applications which require contact in sea-water. The term "copper-nickel (Cu-Ni)" refers to copper-nickel-iron alloys.
Silicon increases the casting ability of Cu-Ni alloys and is used in combination with either chromium or niobium.
Niobium, when added to cast versions of 10% and 30% nickel alloys, acts as a hardening element. It makes the welding of cast alloys easy.
Addition of tin offers improved resistance to atmospheric tarnishing. The alloy C72500 comprises 2% tin and 9% nickel.
Classification
| Copper Alloy No. | Previous Trade Name | Cu(incl Ag) | Pb | Fe | Zn | Ni | Sn | Mn | Other Named Elements | Status | Inactive Date |
|---|---|---|---|---|---|---|---|---|---|---|---|
| *C701001 | - | Rem. | - | .05 | .25 | 3.0-4.02 | - | .50 | - | Active | - |
| *C702001 | - | Rem. | .05 | .10 | - | 2.0-3.02 | - | .40 | - | Active | - |
| *C702301 | - | Rem. | - | - | .50-2.0 | 2.2-3.2 | .10-.50 | - | .40-.8Si .10Ag | Active | - |
| *C702401 | - | Rem. | .05 | .10 | .30-.8 | 1.0-4.02 | - | .01-.20 | .40-.8Si .01-.10Ag | Active | - |
| *C702501 | - | Rem. | .05 | .20 | 1.0 | 2.2-4.22 | - | .10 | .05-.30Mg .25- 1.2Si | Active | - |
| *C702521 | Copper Nickel | Rem. | .05 | .20 | 1.0 | 3.0-4.22 | - | .11 -.20 | .05-.30Mg .40-1.2Si | Active | - |
| *C702601 | - | Rem. | - | - | - | 1.0-3.02 | - | - | .01P .20 -.7Si | Active | - |
| *C702651 | - | Rem. | .05 | - | .30 | 1.0-3.02 | .05-.8 | - | .01P .20 -.7Si | Active | - |
| *C702701 | - | Rem. | .05 | .28-1.0 | 1.0 | 1.0-3.02 | .10-1.0 | .15 | .20- 1.0Si | Active | - |
| C702751 | Copper Nickel Alloy | Rem. | .01 | .25 | .30-1.0 | .50-1.5 | .30-1.0 | - | .01Ca .06Cr .002-.20Mg .10-.50Si | Active | - |
| *C702801 | - | Rem. | .02 | .015 | .30 | 1.3-1.72 | 1.0-1.5 | - | .02-.04P .22-.30Si | Active | - |
| *C702901 | - | Rem. | .02 | .015 | .30 | 1.3-1.72 | 2.1-2.7 | - | .02-.04P .22-.30Si | Active | - |
| C70300 | Copper Nickel Alloy | Rem. | - | .05 | - | 4.7-5.7 | - | .05 | - | Inactive | 07/01/1974 |
| *C703101 | - | Rem. | .05 | .10 | 2.0 | 1.0-4.02 | 1.0 | - | .01Mg .05P .08- 1.0Si .02-.50Ag .005-.05Zr | Active | - |
| C70320 | Copper Nickel | Rem. | - | - | - | 2.5-5.0 | - | - | .20-1.2Al .18-.50Cr .20- 1.2Si | Inactive | 03/09/1992 |
| *C703501 | - | Rem. | .05 | .20 | 1.0 | 1.0-2.5 | - | .20 | 1.0-2.0Co .04Mg .50- 1.2Si | Active | - |
| *C703701 | - | Rem. | .05 | .20 | 1.0 | 1.0-2.0 | - | .20 | 1.0-2.0Co .04Mg .50-1.0Si .20-.70Ag | Active | - |
| *C704001 | Copper-Nickel, 5% | Rem. | .05 | 1.3-1.7 | 1.0 | 4.8-6.22 | - | .30 -.8 | - | Active | - |
| C704401 | 95/5 Copper-Nickel | Rem. | .05 | 1.0-1.8 | 1.0 | 4.5-6.04 | - | 1.0- 1.5 | .05C .35-.45Si .05S | Inactive | 03/09/1992 |
| *C705001 | Copper-Nickel, 7% | Rem. | .05 | .10 | .20 | 5.8-7.82 | - | .15 | - | Active | - |
| *C706001 | Copper-Nickel, 10% | Rem. | .05 | 1.0-1.8 | 1.0 | 9.0-11.02 | - | 1.0 | - | Active | - |
| *C706101 | - | Rem. | .01 | 1.0-2.0 | - | 10.0-11.02 | - | .50-1.0 | .05C .05S | Active | - |
| *C706201 | - | 86.5min | .02 | 1.0-1.8 | .50 | 9.0-11.02 | - | 1.0 | .05C .02S .02P | Active | - |
| *C706901 | - | Rem. | .001 | .005 | .001 | 9.0-11.02 | - | .001 | 5 | Active | - |
| *C707001 | - | Rem. | - | .05 | - | 9.5-10.52 | - | .50 | - | Active | - |
| *C708001 | Copper-Nickel, 11% | Rem. | .05 | .10 | .20 | 10.5-12.52 | - | .15 | - | Active | - |
| C70900 | Copper Nickel | Rem. | .05 | .6 | 1.0 | 13.5-16.5 | - | .6 | - | Inactive | 03/09/1992 |
| *C710001 | Copper-Nickel, 20% | Rem. | .05 | 1.0 | 1.0 | 19.0-23.02 | - | 1.0 | - | Active | - |
| *C711001 | - | Rem. | .05 | .10 | .20 | 22.0-24.02 | - | .15 | - | Active | - |
| C71110 | Copper Nickel | Rem. | - | - | - | 21.5-23.5 | - | .35 | .008S .05Ti | Inactive | 03/09/1992 |
| *C713001 | - | Rem. | .05 | .20 | 1.0 | 23.5-26.52 | - | 1.0 | - | Active | - |
| *C715001 | Copper-Nickel, 30% | Rem. | .05 | .40-1.0 | 1.0 | 29.0-33.02 | - | 1.0 | - | Active | - |
| *C715201 | - | 65.0min | .02 | .40-1.0 | .50 | 29.0-33.02 | - | 1.0 | .05C .02P .02S | Active | - |
| *C715801 | - | Rem. | .05 | .50 | .05 | 29.0-33.02 | - | .30 | (6) | Active | - |
| *C715811 | - | Rem. | .02 | .40-.7 | - | 29.0-32.02 | - | 1.0 | (7) | Active | - |
| *C71590 | - | Rem. | .001 | .15 | .001 | 29.0-31.02 | .001 | .50 | (5) | Active | - |
| C71600 | Copper Nickel Alloy | Rem. | .05 | 4.8-5.8 | 1.0 | - | - | 1.0 | 29.0- 33.0Si | Inactive | 05/25/1971 |
| C71630 | Copper Nickel | Rem. | .01 | .40-1.0 | - | 30.0-32.0 | - | .50-1.5 | .06C .08S8 | Inactive | 03/09/1992 |
| *C716401 | - | Rem. | .058 | 1.7-2.3 | 1.08 | 29.0-32.02 | - | 1.5-2.5 | .06C .03S | Active | - |
| *C717001 | - | Rem. | - | .40-1.0 | 1.0 | 29.0-33.02 | - | 1.0 | .30 -.7Be | Active | - |
| C719001 | - | Rem. | .015 | .50 | .05 | 28.0-33.02 | - | .20-1.0 | .04C 2.2- 3.0Cr .02P .25Si .015S .01-.20Ti .02-.35Zr | Active | - |
| C72000 | Copper-Nickel Alloy | Rem. | .05 | 1.5-2.5 | .30 | 40.0-43.0 | - | .8-1.7 | - | Inactive | 02/25/1971 |
| C721501 | - | Rem. | .05 | .10 | .20 | 43.0-46.02 | - | .05 | .10C .50Si | Active | - |
| C722009 | - | Rem. | .058 | .50-1.0 | 1.08 | 15.0-18.02 | - | 1.0 | .30-.7Cr .03Si .03Ti8 | Active | - |
| C72400 | Copper Nickel | Rem. | .05 | .10 | .50 | 11.0-15.0 | .05 | - | 1.5-2.5Al .05-.40Mg 1.0Hg | Inactive | 03/09/1992 |
| C7242010 | - | Rem. | .02 | .7-1.2 | .20 | 13.5-16.52 | .10 | 3.5-5.5 | 1.0- 2.0Al .05C .50Cr .05Mg .01P .15Si .15S | Active | - |
| *C725009 | - | Rem. | .05 | .6 | .50 | 8.5-10.52 | 1.8-2.8 | .20 | - | Active | - |
| C7260010 | Copper Nickel | 91.0-93.0 | - | .20 | .50 | 3.5-4.52 | 3.5- 4.5 | .20 | .05P | Inactive | 03/09/1992 |
| *C7265010 | - | Rem. | .01 | .10 | .10 | 7.0-8.02 | 4.5-5.5 | .10 | - | Active | - |
| *C7270010 | - | Rem. | .0211 | .50 | .50 | 8.5-9.52 | 5.5-6.5 | .05 -.30 | .15Mg .10Nb | Active | - |
| *C7280010 | - | Rem. | .005 | .50 | 1.0 | 9.5-10.52 | 7.5-8.5 | .05 -.30 | .10Al .02Sb .001Bi .001B .005-.15Mg .10-.30Nb .005P .05Si .0025S .01Ti | Active | - |
| *C7290010 | - | Rem. | .0211 | .50 | .50 | 14.5-15.52 | 7.5- 8.5 | .30 | .15Mg .10Nb | Active | - |
| *C7295010 | - | Rem. | .05 | .6 | - | 20.0-22.02 | 4.5-5.7 | .6 | - | Active | - |
| C731001 | Copper Zinc Nickel Alloy | Rem.12 | .05 | .10 | 18.0-22.0 | 4.0- 6.0 | .10 | .50 | - | Active | - |
| C73150 | Copper Nickel | Rem. | .10 | .25 | 9.0-15.0 | 4.0-7.0 | - | .50 | - | Inactive | 03/09/1992 |
| C73200 | Copper Nickel | Rem. | .05 | .6 | 3.0-6.0 | 19.0-23.0 | - | 1.0 | - | Inactive | 03/09/1992 |
Our spot inventory
| ASME SB111 C71500 |
C70600 seamless condenser tube |
C70600 welded copper nickel pipe |
| ASTM B111 C70600 |
ASTM B466 C71500 pipe |
C71500 cupronickel boiler tube |
| 70/30 copper nickel pipe |
C71500 heat exchanger tube |
C70600 welded copper nickel pipe |
| SB111 UNS C70600 |
70/30 cupronickel condenser tube |
ASTM B111 C71500 heat exchanger tube |
|
C71500 copper nickel pipe |
ASTM B111 C70600 heat exchanger tube |
ASME SB111 C70600 copper nickel pipe |
About us
Gnee is a premier manufacturer and international supplier of comprehensive copper and copper alloy products, committed to delivering excellence in copper tubes, copper sheets, copper plates, copper bars, copper rods, copper wires, and copper strips.
Our Extensive Product Portfolio & Specifications:
Copper Tubes & Pipes:
We supply a full range including **Capillary Tubes, Thin-Walled Copper Tubes, Thick-Walled Copper Tubes, Round Pipes, Square Pipes, Rectangular Pipes, Welded Pipes, Seamless Pipes, Heat Exchanger Tubes, and Condenser Tubes.
Copper Sheets, Plates:
Our flat-rolled products cover Copper Foils, Thin Sheets, Thick Plates, and Circles (Round Plates) in various tempers (O, H) for diverse applications.
Copper Bars, Rods & Profiles:
We offer Round Bars, Square Bars, Hexagonal Bars, and Flat Bars with excellent machinability and strength.
Copper Wires & Strips:
Our lineup includes high-conductivity Bare Copper Wires, Stranded Wires, and precisely manufactured Copper Strips.
Common Alloys & International Standards:
We master a wide array of materials compliant with ASTM, EN, JIS, and GB standards:
Pure Copper: C11000 (ETP Copper), C10200 (Oxygen-Free Copper), C12000 (DLP)
Brass Alloys: C26000 (Cartridge Brass), C27200 (Brass), C28000 (Muntz Metal)
Copper-Nickel: C70600 (CuNi90/10), C71500 (CuNi70/30)
Phosphor Bronze: C51900, C52100, C54400
Serving industries from HVAC/R and plumbing to electrical, automotive, and marine engineering, Gnee provides OEM support, competitive pricing, and reliable bulk supply for your global projects.
