Alumina-Forming High-Temperature Steels Offer New Opportunities in Heat Treatment
The goal of energy-efficient heat processing often sets demands on higher operating temperatures and/or reduced cooling. A limiting factor in this respect is often material issues, such as materials that can withstand extreme temperatures and corrosive atmospheres.
In two novel, alumina-forming steels, Kanthal APMT and Nikrothal PM 58, corrosion resistance is based on the formation of an adherent alumina layer. This, along with a high creep resistance, is caused by a dispersion-strengthened microstructure from the powder metallurgical processing route. This unique combination of properties enables application temperatures ranging from 1470 to 2282 °F and new possibilities for design of high-temperature components, such as furnace rollers with reduced or eliminated water cooling.
For more information: Kanthal, Part of Sandvik Group, www.kanthal.com.