EROSION CORROSION RESISTANCE OF CHROMIUM AND NIOBIUM MODIFIED 70/30 COPPER NICKEL ALLOYS FOR SEAWATER PIPING SYSTEMS

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Authors
  1. Hanham, C.M.
  2. Hollingshead, R.S.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The erosion corrosion resistances of two potential firemain replacement weldable alloys with sufficient strength were evaluated: cast chromium modified 70/30 copper nickel and cast niobium modified 70/30 copper nickel. For comparison purposes the present firemain materials, wrought 90/10 copper nickel and cast leaded tin bronze (ASTM B61), were also tested. The weight loss of each alloy was measured after exposure to impingement attack by a seawater jet mixed with air bubbles. Cast chromium modified 70/30 copper nickel in both the welded and parent metal conditions had greater resistance to erosion corrosion under the severe conditions to which the alloys were exposed than the niobium modified alloy. The parent metal of the chromium modified alloy exhibited erosion corrosion resistance that was as good as or better than that of the presently employed materials, but the weld metal of the chromium modified alloy was generally not as resistant.
Report Number
DREA-TM-84-I — Technical Memorandum
Date of publication
15 May 1984
Number of Pages
47
DSTKIM No
84-02886
CANDIS No
122194
Format(s):
Electronic Document(PDF);Originator's fiche received by DSIS;Hardcopy

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