ThermTech is proud to offer normalizing for machined parts. The process is employed on  machined parts products to homogenize the grain structure, improve machinability and response to subsequent heat treating processes.


All normalizing processes are run out of batch-type furnaces for optimum process and lot control. Our largest furnace capable of performing normalizing heat treatments 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 parst in order to refine that 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, the parts are typically heated to a temperature slightly above the austenitizing temperature – usually 1600°F – 1750°F to promote atomic mobility that enhances homogenization of the steel. The parts are then held at the normalizing temperature for several hours and are usually cooled in still air (although the 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 and 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 a sales representative today to discuss how our normalizing services can benefit your machined parts products!