Refractory steels are characterised by their modified behaviour in high-temperature environments, i.e. these steels are prepared to function at high temperatures thanks to a reinforced oxide layer. When subjected to an increase in temperature, steel becomes less rigid and experiences plastic deformation which depends on time. This yield also accompanied by other consequences, such as increased brittleness.
This type of steel also experiences a change due to its medium, which gives rise to high resistance to corrosion at high temperature. Refractory steels usually have a high chromium and nickel content, and are recommended for processes with a risk of thermal shock.
Refractory steels are mainly used in heat treatment furnaces and in the steel industry.