Effect of the Operating Temperature of a Steam Methane Reforming Furnace on Structural Changes and Crack Susceptibility in Welding 800HT Nickel Alloy.

Gudenko, A. S.; Skorobogatykh, V. N.; Korneev, A. A.; Bardin, I. V.; Parshikova, N. V.; Bukharin, I. I.; Makarova, E. A.

The long-term operation of 800HT nickel alloy parts of a steam methane reforming furnace at temperatures above 800°C leads to significant embrittlement of the metal, sharp grain growth, and precipitation and coagulation of metal carbides along the grain boundaries. The operation of equipment at lower temperatures (400–420°C) does not lead to significant changes in the microstructure of 800HT nickel alloy; hence, no embrittlement. It was found out that the cause of the cracking of the welded joint after repair is the degradation of the base metal during operation at temperatures above 800°C.

NICKEL alloys; STEAM reforming; TEMPERATURE effect; WELDING; FURNACES; CRYSTAL grain boundaries; EMBRITTLEMENT

Metallurgist, 2023, Vol 67, Issue 1/2, p17

0026-0894

Academic Journal

10.1007/s11015-023-01485-5