Home > Carbonitriding


Case Hardening/ Carbonitriding for Plain Carbon Steels
Carbonitriding can be performed on both heavy gage stampings as well as low alloy machined components and gearing. It is most commonly used for plain carbon steels. The case depths most commonly requested are in the 0.003" to 0.020" range due to the low hardenability of the steels involved. We have numerous furnaces capable of carbonitriding. If you have a large volume of parts, submit a quote request and we will respond promptly.

Carbonitriding Capabilities on Furnace Variables
All our carbonitriding cycles are run in batch-type furnaces for optimum process and lot-control. Our largest furnace capable of performing the carbonitriding cycle has a working dimension of 36” x 42” x 72” and can handle weights up to 7000 pounds. All our furnaces are certified to the temperature accuracy and uniformity requirements of AMS 2750.

The Carbonitriding Process

  • The process of case hardening by carbonitriding is performed by austenitizing the heat-treat load in a controlled, carbon-rich atmosphere for a length of time commensurate with the case depth requirement, and then quenching the part in oil to harden the developed case.
  • Selective case hardening is possible through the application of carb stop-off paints.
  • ThermTech is able to achieve conformance with carbonitriding requirements that other heat-treaters cannot conform to, due to our ability to polymer quench after a carbonitriding cycle.

Expert Recommendations from ThermTech
We often recommend the carbonitriding process to case harden heavy-gage stampings, low-alloy machined components, and gears. Typical case depths are in the .003-.020” range due to the low hardenability of the steels involved. But with our superior capabilities and expertise, we can reach case depths in excess of 0.100” even for the most marginal materials.

ThermTech offers this carbonitriding processes for many steel alloys. The following are among those we treat most often:

  • Case hardening of 1018
  • Case hardening of 1117
  • Case hardening of 12L14
  • Case Hardening of A-36