Copper Nickel Alloy with Additions of Iron and Manganese—Copper Nickel 70/30 / NES 780

The 70/30 copper nickel stocked by Columbia Metals Ltd is a 70% copper, 30% nickel alloy with additions of manganese and iron elements. These elemental incorporations make it fairly more resistant to corrosion and erosion, and with marginally enhanced strength level than 90/10, making it ideal for more challenging applications.

Specifically, 70/30’s corrosion resistance is remarkably enhanced in high-velocity waters (up to 4.5 m/second) and polluted seawater. 70/30 can be easily cold worked, fabricated, and welded without any extraordinary material considerations.

The most common specifications covering this alloy are the C71500 and CN107 designations, although the Defense Standard DEF STAN 02-879 Annex B (superseding DEF STAN 02-780 and NES 780) provides stricter controls on impurities and mechanical properties along with a compulsory impact value.

Related Specifications of 70/30

  • C71500
  • C71520
  • CN107
  • CW354H
  • DGS320
  • DEF STAN 02-780
  • DEF STAN 02-879 Annex B
  • EN 12164
  • 2.0882
  • BS2874
  • CuNi30Mn1Fe
  • ASTM B151
  • NES780

Nominal Composition of 70/30

Cu rem, Fe 0.7%, Ni 30%, and Mn 1.0%

Mechanical Properties of 70/30

Ultimate Tensile Strength (N/mm²) Proof Stress (N/mm²) Elongation (%) Hardness (HB)
310   27 80-120

 

Key Features of 70/30

  • Superior corrosion and pitting resistance in marine environments
  • Resistance to biofouling
  • Easy to weld and fabricate
  • Good toughness and strength

Applications of 70/30

  • Offshore and marine—salt water flanges, sea water intakes, pipe fittings, valve bodies, salt water piping and pipe fittings, propeller sleeves, water boxes, and pump bodies and parts
  • Chemical processing—heat exchanger and cooling plant, distiller tubes, evaporator tubes, and refrigerator and condenser parts
  • Others—welding backing rings, weld wire, flexible metal hose, and boiler parts

Columbia Metals—a Top Supplier of 70/30

With almost 60 years of experience and an extensive variety of stock, Columbia Metals is an industry leader in the supply of 70/30 and other top quality specialist engineering alloys.

Copper Alloys

  Related Specifications Mechanical Properties
Alloy Name BS UNS BS EN Others Ultimate Tensile Strength N/mm² Minimum Yield Strength N/mm² Elongation % Hardness HB
Copper Nickel 90/10 CN102 C70600; C70610 CW352H 2.0872 280 105 27 70-120
Copper Nickel 70/30 / NES 780 CN107 C7150­; C71520 CW354H NES780 310   27 80-120
DEF STAN 02-835   C72420   DGS357 710-725 400-430 18-22  
NIBRON SPECIA­L® DTD900/4805 C72400   2.1504 770-850 555-630 12 229-240
DTD498 / BSB25 DTD498 C64700 CW111C BSB25 580 430 18 159-207HV
COLSIBRO® DTD498 C64700; C18000 CW111C 2.0855 550-640 430-590 10 155-180
TROJAN   C70250; C70252 CW112C 2.0857 690-800 570-750 10 190-200
Beryllium Copper (BECOL-25) CB101 C17200 CW101C ASTM B196­; CDA 17­200        
CHROMZIRC-3 CC101 C18200 CW105C BS4577 A/2/1 450 400 20 140HV
CHROMZIRC-328 CC102 C18150 CW106C BS4577 A/2/2; IS­O5182 450 400 20 140HV
COLDUR-A® CS101 C6550­; C65600 CW116C ASTM B98; ASTM B249 485 260 20  
COLDUR-B   C65100 CW115C ASTM B98 380 140 15  

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