Normalizing homogenises the structure and modifies the grain size of the material. It is recommended after forging, hot rolling, flame cutting, etc.
The treatment in itself enhances the properties of the material, but is also advantageous in preparing material for subsequent heat treatment processes.
Holt’s offer normalising for plain carbon, medium alloys steels, and cast irons. Component sizes/capacity of up to 2.7m long x 1.5m in diameter can be accommodated.
Available processing atmospheres are: air, products of combustion, controlled atmosphere and vacuum, with the choice of atmosphere dependant on the component size, shape and final requirements.
The process is sometimes confused with some of the annealing processes and it does have some similarities because normalizing involves heating to the austenitizing temperature of the steel (or iron). However normalizing is generally considered to include a faster cooling rate that is undertaken in air rather than a controlled atmosphere.
Normalizing can also offer improvements in mechanical properties (UTS, YS, reduction of area, and impact strength), to levels higher than which are achievable with annealing.