Special Process Heat Treating

ENGINEERED HEAT TREAT, LLC

YOUR PARTS. METALLURGICALLY ENGINEERED.

Proudly Leading the Special Process Heat Treating Industry Since 1959, For more than six decades, Engineered Heat Treat, LLC has been a trusted partner to manufacturers across Aerospace & Defense, Medical, Automotive, Performance Racing, Industrial, and Commercial markets. As a family-founded and operated company, we combine generations of metallurgical expertise with cutting-edge technology to deliver consistent, reliable, and precision-engineered heat-treating solutions.

EHT offers a comprehensive range of thermal processing services supported by advanced furnace control systems, a state-of-the-art in-house metallurgical laboratory, and continuous investment in equipment, training, and quality systems. Our vertically integrated operation allows us to perform multiple stages of heat-treat preparation, processing, testing, and inspection under one roof, reducing lead times while maintaining complete process control.

Certified to NADCAP, AS9100, ITAR, ISO/IEC 17025, and CMMC Level 2, we proudly serve OEMs, Tier One suppliers, and manufacturers that demand the highest level of quality, traceability, and process consistency.

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Services we offer

SERVICES & SPECIAL PROCESSES
Engineered Heat Treat provides a comprehensive range of thermal processing services, supporting both standard commercial requirements and the industry's most demanding special process specifications. From prototype development to high-volume production, our experienced team delivers precision, consistency, and reliability across a wide variety of materials and applications.

Our fully equipped, state-of-the-art **Metallurgical Laboratory** is staffed by experienced metallurgists and highly qualified technicians who utilize advanced testing and inspection equipment to verify compliance with customer, industry, and aerospace specifications. Every process is backed by rigorous quality control, complete traceability, and detailed metallurgical evaluation to ensure your components perform as designed.

Whether your requirements involve Aerospace & Defense, Medical, Automotive, Industrial, Performance Racing, or Commercial applications, Engineered Heat Treat has the technical expertise and processing capabilities to deliver dependable results.

Explore our available processes below to learn more about our extensive heat-treating capabilities and special process offerings.

Our Commitment
At Engineered Heat Treat, our commitment extends beyond processing parts, we build long-term partnerships through quality, responsiveness, and continuous improvement.
We are dedicated to providing heat-treating services that consistently meet or exceed our customers' expectations for **quality, delivery, technical support, and value**. Through ongoing investment in advanced equipment, employee development, process innovation, and robust quality systems, we continuously improve our operations to provide dependable solutions and exceptional customer satisfaction.
Every part we process reflects our commitment to precision, performance, and the highest standards of metallurgical excellence.

Gas Carburizing

Case hardening is specified by "hardness" and "case depth". The case depth can be specified in two ways: total case depth or effective case depth. The total case depth is the true depth of the case. For most alloys, the effective case depth is the depth of the case that has a hardness equivalent to HRC50; however, some alloys specify a different hardness (40-60 HRC) at effective case depth.

Hardening - Atmosphere

Atmosphere – Martensitic transformation, more commonly known as quenching and tempering, is a hardening mechanism specific for steel. The steel must be heated to a temperature where the iron phase changes from ferrite into austenite.

Hardening - Neutral salt bath

Salt baths are used in a wide variety of heat treatment processes including neutral hardening, liquid carburizing, liquid nitriding, austempering, martempering and tempering. Parts are loaded into a pot of molten salt where they are heated by conduction, giving a very readily available source of heat. The core temperature of a part rises in temperature at approximately the same rate as its surface in a salt bath.

Automated Gas Nitriding

In gas nitriding the donor is a nitrogen-rich gas, usually ammonia (NH3), which is why it is sometimes known as ammonia nitriding. When ammonia comes into contact with the heated work piece it dissociates into nitrogen and hydrogen. The nitrogen then diffuses onto the surface of the material creating a nitride layer.

Vacuum Heat Treating

Vacuum furnaces are used in a wide range of applications in both production industries and research laboratories. At temperatures below 1200 °C, a vacuum furnace is commonly used for the heat treatment of steel alloys. Many general heat-treating applications involve the hardening and tempering of a steel part to make it strong and tough through service. Hardening involves heating the steel to a predetermined temperature, then cooling it rapidly in water, oil or suitable medium.

Gleason Die Quenching

A quench press is a machine that uses concentrated forces to hold an object as it is quenched. These types of quench facilities are used to quench large gears and other circular parts so that they remain circular.

Plug Quenching

A process in which tooling plugs are inserted to critical areas of the part during the quenching process to limit the dimensional changes of the part such as a spline.

OUR PROCESSES

A history of great service for over 65 years…

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How can we help you?

Please let us know if you have any comments or questions by submitting them in our guest book or contacting us by phone (248) 588-5141.