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The Reaction Of Stainless Steel Plate With Gas
Oct 25, 2017

Hydrogenation may occur in ammonia synthesis, hydrodesulfurization and petroleum refining. Carbon steel is not suitable for high pressure hydrogen devices above 232 ° C. Hydrogen diffuses into the steel and reacts at the grain boundary or in the pearlite zone and the iron carbide to produce methane. Methane (gas) can not diffuse beyond the steel and gather together to produce white spots and cracks in the metal or one of them. In order to prevent the generation of methane, the cementite must be replaced with stable carbides, and chromium, vanadium, titanium or diamonds must be added to the steel. It is noted that increasing the chromium content allows higher temperatures and hydrogen pressures to be formed in these steels Chromium carbide, and it encounters hydrogen is stable. Chromium steel and austenitic stainless steels with a chromium content greater than 12% are resistant to corrosion in all known applications under harsh conditions of use (temperatures above 593 ° C).