70/30 is a 70% copper, 30% nickel alloy with additions of iron and manganese. These elemental additions make it somewhat more resistant to corrosion and erosion and with slightly improved strength level than 90/10, making it suitable for more demanding applications. In particular, its corrosion resistance is notably improved in high-velocity waters (up to 4.5m/s) and polluted seawater.
70/30 is readily cold worked, fabricated and welded without any special material considerations. The most popular specifications covering this alloy are the CN107 and C71500 designations, although the Defence Standard DEF STAN 02-879 Annex B (superseding DEF STAN 02-780 and NES 780) offers tighter controls on impurities and mechanical properties together with a mandatory impact value.
SPECIFICATION
- Specifications ASTM B435 / ASME SB435
- Width 1000mm / 1219mm /1250mm / 1500mm / 2000mm
- Length 2000 mm / 2440 mm / 2500 mm / 3000 mm / 6000 mm
- Thickness 0.1mm to 12 mm Thk
- Hardness Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc.
Finish Hot rolled plate (HR), Cold rolled sheet (CR).
Form Coils, Foils, Rolls, Plain Sheet, Strip, Flats, Blank (Circle), Ring (Flange) etc. CUPRO NICKLE ALLOYS
Chemical composition
C % Si % Mn % P % S % Al % Cr % Cu % Ni % Mo % Nb % Ti % V %
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