Published: Jan 1982
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Chromium contents of at least 20 percent are necessary for long-term protection from hydrogen sulfide attack at 889 to 982°C (1650 to 1800°F) in high British thermal unit gas compositions. The cast alloys HD and HE with a chromium content range of 26 to 30 percent are duplex alloys ferrite in an austenitic matrix as normally produced. Additions of nitrogen can lower the ferrite content and increase the short-time elevated temperature properties. This report notes the rate of increase per 0.01 percent nitrogen for HD and HE at 760°C (1400°F) and HF at 704°C (1300°F).
nitrogen, hydrogen sulfide attack, elevated-temperature properties
Senior metallurgist, ESCO Corp., Portland, Ore.