THE BEHAVIOUR OF STEELS IN ATMOSPHERES CONTAINING CO AND H2 AND THE EFFECT OF PRETREATMENT AND GASEOUS ADDITIVES

摘要

The behaviour of various heat exchanger steel materials in gas mixtures containing 0.1-1 vol % CO and H2 and approximately 10 vpm of H20 has been investigated in the temperature range of 400-600"C for periods of exposure up to 2000 hours under flow conditions. It was found that in these conditions mild steels, steels with low Cr-content and ferritic steels tend to form carbon deposits whereas austenitic steels and Ni-based alloys undergo superficial oxidation, the latter causing considerable weight increases in the case of alloys with very high Ni-content.