THE CARBURIZATION OF CHROMIUM - NICKEL STEELS IN HIGH TEMPERATURE GASEOUS ATMOSPHERES OF LOW OXYGEN ACTIVITY AND THE USE OF INHIBITIVE TREATMENTS
The paper is concerned primarily with an evaluation of the carburization behaviour of chromium - nickel steels exposed to gaseous environments within the temperature range 825 degrees C - 1000 degrees C. Materials used are of potential value for the coal gasification and chemical/petrochemical industries have been selected for these investigations. Wrought and cast alloys based on the 25Cr-20Ni, 25Cr-35Ni and 20Cr-32Ni groups have been studied, both commercial and simpler "model" alloys being included. Kinetic and mechanistic evaluations have been made on specimens from each of these materials exposed to low oxygen activity H-2 - CH-4 gas mixtures. The influences of both environmental and materials variables have been studied and results of these investigations are presented. The effect of inhibitive treatments, which may confer a degree of protection against the ingress of carbon, is also included. Preliminary results are presented on the ability of pre-formed oxides to reduce carbon uptake by these materials and also the potential benefits to be gained from minor additions to the gas chemistry, such as sulphur bearing species, is discussed.
Bibliographic Reference: CORROSION IN COAL CONVERSION SYSTEMS, SUDBURY HOUSE, LONDON (UK), MAY 5-7, 1982 PP. 465-489, PROCEEDINGS, WRITE TO APPLIED SCIENCE PUBLISHERS LTD., RIPPLE ROAD, BARKING, ESSEX (ENGLAND)
Record Number: 1989122015100 / Last updated on: 1987-01-01
Available languages: en