No abstract

The paper is concerned with the corrosion phenomena likely to influence the selection of materials for refinery service at elevated temperatures. The problems of oxidation, sulfidation and carburization are discussed in detail and consideration is given to the effects of condensate corrosion and residual oil ash corrosion. The contributions of various alloying elements in the common engineering alloys to their physical and mechanical behavior as well as to their corrosion resistance at elevated temperatures are discussed. Basic considerations for the selection of suitable alloys to withstand high temperature corrosive environments are outlined. 8.4.3

The scaling behavior of a number of iron-chromium-nickel alloys has been examined under cyclic conditions involving 15 min heating in air, followed by 5 min air cooling. The results for test temperatures of 1400, 1600, and 1800 F permit the mapping of alloy compositions in terms of ability to resist scaling or flaking of their oxide films. While nearly all compositions are satisfactory at 1400 and 1600 F, scaling is pronounced at 1800 F for alloys containing less than 35 per cent nickel and less than about 20 per cent chromium at the low end of the nickel range and less than about 15 per cent chromium at the high end of the range.

No abstract

No abstract