Life Improvement of Furnace Alloys by Hot Dip Aluminizing

As a part of a large project in CHTE to extend the life of furnace alloys and fixtures, a hot dip process to aluminize RA330 steel has been experimentally investigated. It is well known that aluminum oxide at the surface steel will reduce carbon pick up.

Samples of RA330 steel were dipped in pure liquid aluminum at 700 °C for 10 minutes. The microstructure of the hot dipped alloy was determined to be comprised of a layer of Aluminum as well as several oxide layers. The as-hot dipped samples were also given a diffusion heat treatment. In this presentation the results of this research will be described in term of microstructure development.