Normalizing Heat Treatment

Normalizing Steel & Carbon Machined Parts & Stampings

ThermTech is proud to offer normalizing heat treatment for machined parts & stampings.

The process is employed to:

  • Homogenize Grain Structure
  • Improve Machinability
  • Improve Response to Subsequent Heat Treating Processes


All normalizing processes are run out of batch-type furnaces for optimum process & lot control.

Our largest furnace is capable has internal working dimensions of 86”W x 182”L x 51”H.

All ThermTech furnaces are certified to AMS 2750, ensuring optimal temperature uniformity during the hardening process.


The normalizing process is commonly applied to carbon and alloy steel parts in order to refine the grain structure and produce a more uniform distribution of carbon content throughout the material. Normalizing does this by producing new austenite grains within the part that are more uniform in size because grain coarsening temperatures are avoided in the process.

Normalizing may also help alleviate a condition known as “banding”, in which alloying elements segregate during either forging or hot rolling.

During normalizing heat treatment, parts are typically heated to a temperature slightly above the austenitizing temperature (usually 1600°F – 1750°F) to promote atomic mobility, whicht enhances homogenization of the steel.

The parts are then held at the normalizing temperature for several hours & are usually cooled in still air (cooling rate can be altered depending on the final hardness needed).

The final result is a part that will machine more easily with less movement.

If the part is subsequently quenched & tempered, the response will be more uniform throughout the part because of the homogenized grain structure and chemistry, lending to better mechanical performance.

ThermTech offers normalizing for machined parts of any steel grade, but the following are the most common:

  • Normalizing 4140 Steel
  • Normalizing 4340 Steel
  • Normalizing 8620 Steel
  • Normalizing 4130 Steel

If a clean finish is required after normalizing, ThermTech offers several different blasting services to remove any oxide present.

Contact ThermTech today to discuss how our normalizing services can benefit your machined parts & stampings!