Normalizing
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NORMALIZING HEAT TREATMENT

NORMALIZING HEAT TREATMENT FOR STEEL FORGINGS

ThermTech is proud to provide normalizing heat treatment for steel forgings. The process is employed on forged products to homogenize the grain structure, enhance machinability, and improve response to subsequent heat-treating processes.

Capability to Run Batch-Type Furnaces

  • All normalizing steel processes are run out of batch-type furnaces for optimum process and lot control.
  • Our largest furnace capable of performing steel normalizing heat treatment, 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.

Normalizing Steel Process

Since the forging process is typically performed at temperatures well above grain-coarsening temperatures (usually 1800°F), forged products have significant variability in grain size and a non-uniform microstructure. This can result in difficulties during machining and non-uniform properties. Normalizing steel is a remedy for these conditions. Below is the outline of the process:

  • When normalizing steel, the forgings 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 forgings are then held at the normalizing temperature for several hours and are usually cooled in still air.
  • The cooling rate can be altered depending on the final hardness needed.
  • The final result is a forging that will machine more easily with less movement.
  • If the forging is subsequently quenched and tempered, the response will be more uniform throughout the part because of the homogenized grain structure and chemistry, leading to better mechanical performance.

ThermTech offers normalizing heat treatment for forgings, castings, machined parts and investment castings of any steel grade, but the following are the most common:

  • Normalizing 4140 Steel
  • Normalizing 4340 Steel
  • Normalizing 8620 Steel
  • Normalizing 4130 Steel
  • Normalizing 1045 Steel

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

NORMALIZED HEAT TREATMENT FOR CASTINGS

ThermTech is proud to offer normalizing heat treatments for castings. The process can be employed on cast products to homogenize grain structure, improve machinability and response to subsequent heat- treating processes.

Capable of Optimal Temperature Uniformity and Lot Control

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

Normalizing Process for Carbon and Alloy Steel Castings

Non-uniform cooling after casting can result in non-uniform micro-structures which can result in difficult machinability and non-uniform properties within the casting. The normalizing process is commonly applied to carbon and alloy steel castings in order to refine grain structure and produce a more uniform distribution of carbon content throughout the material after the casting process. Normalizing can also help alleviate a condition known as “segregation” in which alloy elements segregate during either casting or hot rolling.

Normalizing Ductile Iron Castings

Of special interest is ThermTech’s capability to normalize ductile iron castings. Ductile Iron Castings (or DCI castings) often need special cooling rates from above the critical temperature to achieve conformance with the mechanical property requirements of a particular grade (100-70-03 is the most common).

ThermTech’s staff includes two metallurgists who would be happy to provide advice and input into alloying and processing considerations for your part. Our customers have found that our expertise in this field enables them to meet even the most difficult requirements for DCI parts.

NORMALIZING FOR MACHINED PARTS

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.

Normalizing Process to Refine Grain Structure of Steel Alloys

The normalizing process is commonly applied to carbon and alloy steel parts 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.

NORMALIZING HEAT TREATMENT FOR INVESTMENT CASTINGS

ThermTech is proud to offer normalizing heat treatment for investment castings. The process is one of the simplest that can be employed on cast products to homogenize grain structure, improve machinability and generate better response to subsequent heat-treating processes.

Normalizing Process for Investment Castings

Investment castings are usually cooled in ceramic molds as part of the casting process. As a result, the cooling times can be long and may create undesirable microstructures and decarburization.

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