Carbonitriding for Gears, Machined Parts & Stampings at ThermTech

Carbonitriding is a sought-after heat treatment process due to the significant enhancement to wear resistance, surface hardness, and other pivotal properties of steel components subject to this specialized form of heat treatment. At ThermTech, we leverage this process, especially for plain carbon steels, to ensure gears, machined parts, and stampings stand up to rigorous use.

Carbonitriding at ThermTech:

  • Ideal for Plain Carbon Steels:
  • ThermTech is commonly employed to perform carbonitriding on parts made from plain carbon steels. Given the low hardenability of these steels, they respond best to case depths ranging from 0.005″ to 0.020″.
  • Versatile Applications:
  • From heavy gauge stampings to low alloy machined components and gearing, our carbonitriding processes caters to a wide range of parts.
  • Superior Facilities:
  • Our furnaces, which are maintained to be compliant to AMS 2750 standards, allow us optimal process and lot control. Our largest furnace boasts a working dimension of 36” x 54” x 72”, accommodating weights of up to 5000 pounds.

The Carbonitriding Process:

  • Procedure: Austenitizing the heat-treat load in a controlled, carbon & nitrogen rich atmosphere based on the desired case depth requirement, followed by an oil quench to harden the developed case.
  • Selective Case Hardening: Using carb stop-off paints, selective hardening can be achieved.
  • Unique Capabilities: ThermTech can conform to specific carbonitriding requirements that many other heat-treaters find challenging due to our ability to polymer quench post the carbonitriding cycle.

Expert Recommendations from ThermTech:

We frequently advise the carbonitriding process for hardening heavy-gage stampings, low-alloy machined parts, and gears. Typically, case depths are achieved in the .003-.020” range due to the low hardenability of the steels. However, thanks to our advanced capabilities, we can achieve case depths exceeding 0.100” even with the most marginal materials.

ThermTech proudly offers carbonitriding for a wide variety of steel alloys. Among the ones we most frequently treat include:

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


At ThermTech, we employ carbonitriding to guarantee that components such as gears, machined parts, and stampings offer peak performance, durability, and longevity. If you’re looking to enhance the attributes of your components, reach out for a quote, and let our experts provide unmatched heat-treating solutions.

ThermTech—Experts in Austempering Stampings, Machined Parts, and Investment Castings

ThermTech, Inc. offers both small and large batch capabilities for austempering steel and iron investment castings. Between our neutral salt bath furnaces and our larger austempering furnaces, we have the capabilities to austemper a wide variety of stamping, machined components, and investment castings. We have run austempering on alloys from 1060 through 4340 to ductile iron machined parts.

Our dedicated team works with you to ensure we meet your specifications. Count on our decades of experience with hardening, tempering, surface heat treatments, vacuum treatments, and annealing. To learn more about our services, please contact us today.

Learn more about austempering and how ThermTech can serve you by watching these videos.

Request a free quote online or call us at 800-752-6917. You can also contact us online for all your austempering and heat treating needs.


    ThermTech’s quality policy is ZERO DEFECTS for all customer products and in all quality management system activities. Through our efforts to continually improve the quality of the work we offer, we’ve been recognized as being able to meet the rigorous quality standards required by several of our major customers. ThermTech is certified for ISO 9001 and AS9100 in both Metal Heat Treat and Metal Finishing.