Sunday, June 12, 2011

Nickel and Nickel Alloys

As I promised in the last post that I want to post about Nickel and Nickel Alloys in this Piping & Fabrication blog and here it is. Nickel is a tough, malleable metal that offers good resistance to oxidation and corrosion. When nickel is combined with copper as the secondary element, the well-known series of Monel alloys are created. Nickel,Monel, and various modifications of these materials are used in piping systems, turbine blading, valves, and miscellaneous power plant accessories handling steam.

TABLE A3.9 Nickel and Nickel-Based Pipe and Tubing Alloy Specifications

The presence of even a small amount of sulfur in a reducing environment will result in embrittlement as temperatures of 700–1200°F (370–650°C).

By addition of Cr, Co, Mo, Ti, Al, or Nb, the high temperature strength and creep resistance of the nickel-base materials can be substantially increased. However, these alloys possess low ductility values and require special care in forming of these materials, even at elevated temperatures. Table A3.9 lists a number of ASME specifications for nickel-based alloy piping and tubing.

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