MATERIAL PERFORMANCE IN A SOLVENT-EXTRACTION LIQUEFACTION PLANT IN JAPAN

Corrosion behaviour of various steels and alloys in the solvent extrac tion coal liquefaction process in Japan has been studied by the inplan t testing in a 1 ton/day plant and by the laboratory tests related to it. The severest corrosion was observed in the high pressure separator , corrosion thickness loss and pitting depth being the greatest and st ress corrosion cracking bring observed for 18-8 series austenitic stai nless steels. The cause may be the occurrence of water condensate cont aining high Cl- and H2S. Otherwise corrosion was relatively mild. No o bvious symptom of notorious organ ic-chloride corrosion reported in th e U.S. has been observed.