262.723.3345 kim@hudapack.com

atmosphere hardening

Hudapack offers state of the art atmosphere heat treating services designed with our customers in mind. Contact us today via the form for more information.


Atmosphere Heat Treating

Hudapack supports a wide range of atmosphere heat treating services including carburizing, carbonitriding, neutral hardening, carbon restoration, annealing, normalizing, stress relieving and cryogenic treatment. Our batch internal quench furnaces are equipped with state-of-the-art instrumentation to ensure superior heat treating quality, through precise control of temperature, atmospheres and time.

We can also process parts to meet straightness specifications. Secondary services such as straightening, and blasting are also available. We also offer black oxide and plating processes through outside services.



what is atmosphere hardening?

When there is a need to harden mid-carbon to high carbon steels, maintaining the integrity of the surface is critical. To achieve this, heat treating in protective atmosphere is required. This process is also known as neutral hardening. This means that the carbon potential of the protective atmosphere is equal to the components carbon makeup within the steel.

During the heat treat process, the material will experience phase transformation. When the component begins a phase transformation known as austenite, this key temperature is known as the critical temperature. It is at this stage of the heat treat process where the carbon potential set-point of the protective atmosphere is equal to the carbon composition of the steel. If the carbon set-point is lower than the components carbon content degradation of the surface will begin. This degradation is the depletion of carbon at the surface known as decarburization. If the decarburization is severe scaling of the surface will be visual.

restoring surface carbon

The protective atmosphere carbon set-point can be controlled to perform restoration of depleted surface carbon. This is achieved by having the carbon potential within the atmosphere equal to or slightly higher than the carbon content of the component. When the component exceeds the critical temperature for the material the carbon will diffuse into the components surface. This will restore the surface carbon for the component material.

Headquarters/Elkhorn Facility

979 Koopman Lane

Elkhorn, WI 53121

(262) 723-3345 Phone

(262) 723-3752 Fax

Franklin Facility

5512 W. Airways Avenue

Franklin, WI 53132

(414) 421-5140 Phone

(414) 421-2360 Fax

Proudly Serving the midwest


Founded in Elkhorn, WI in 1985 by Gary Huss, our commitment to continuous improvement pushed us to higher levels of quality, delivery, and customer expectation.

Best-in-Class Knowledge

Our expertise guarantees that even the hardest jobs are completed right the first time.

Our Network

As a part of the Thermal Process Holdings network of brands, we are able to provide a number of value adds that go beyond the industry standards in quality, safety, redundancy and best practices.

Take a closer look at the services we provide: