Heat Treatment Companies and Heat Treating Services in the United States

Heat treatment plays a vital role in the performance, durability, and reliability of metal components used across nearly every major industrial sector. RFQ ★ USA was built to connect engineers, buyers, and production teams with certified U.S.-based heat treatment companies that understand the science and standards behind metal hardening, tempering, stress relief, and more. Whether you need one-time heat treatment support or an ongoing contract partnership, our platform allows you to quickly identify and contact proven providers with the equipment, certifications, and experience to meet your exact requirements.

Each company listed on RFQ ★ USA is thoroughly reviewed by our internal manufacturing experts before being added to the directory, so you can browse and submit RFQs with confidence.

Metal Hardening, Annealing, and Normalizing Services

RFQ ★ USA features a broad network of heat treatment shops offering a range of thermal processes to adjust the mechanical properties of ferrous and non-ferrous metals. These include through hardening, case hardening, annealing, normalizing, stress relieving, and more. Whether your parts require improved surface wear resistance or controlled hardness for machining and assembly, the companies featured on our platform have the thermal control and metallurgical knowledge to deliver consistent, documented results.

Commonly treated materials include tool steels, carbon steels, stainless steels, aluminum, copper alloys, titanium, and specialty grades used in aerospace and defense.

ISO and NADCAP Certified Heat Treaters

To meet the high standards of industries like aerospace, energy, defense, and medical manufacturing, many of the heat treatment companies listed on RFQ ★ USA maintain ISO 9001:2015 certification and Nadcap accreditation. These certifications validate their quality management systems, thermal process control, documentation procedures, and traceability throughout the treatment cycle.

When precision and compliance are essential, using a certified heat treater ensures that each part undergoes proper cycle verification, furnace calibration, and post-process inspection. Our advanced search filters allow you to easily identify companies with the certifications that align with your project’s requirements.

Carburizing, Induction Hardening, and Vacuum Heat Treating

Different applications require different approaches, and the RFQ ★ USA platform includes heat treaters with specialized capabilities such as:

• Gas or vacuum carburizing for wear-resistant surface hardening
• Induction hardening for targeted reinforcement of shafts, gears, and components
• Vacuum heat treating for precision parts with tight tolerances and low contamination requirements
• Cryogenic treatment to increase dimensional stability in tool steels
• Flame hardening for large or localized treatment zones

Our member companies serve customers in industries ranging from mold making and tooling to aerospace components, military hardware, agricultural machinery, and automotive drivetrain systems.

Heat Treatment for Aerospace, Military, Automotive, and Tooling Applications

Parts that must withstand wear, load, heat, or fatigue benefit greatly from proper heat treatment, and RFQ ★ USA helps you find trusted suppliers who serve your industry. Our heat treating members regularly process parts like:

• Aerospace structural components and landing gear
• Firearm barrels and receivers
• Automotive gears, crankshafts, and axles
• Hydraulic parts, bushings, and bearing races
• Injection mold tools and dies
• Construction equipment and fasteners

You can easily browse and sort heat treating providers by process, material expertise, industry focus, and certification status to find the right partner for your job.

Ready to Connect with America’s Best Heat Treating Companies?

When you use RFQ ★ USA, you’re not just searching a directory, you’re accessing a network of thoroughly vetted American manufacturing service providers. Every heat treatment company listed has been approved by our internal team based on their technical capabilities, certifications, and reputation for delivering quality work on time.

Use our smart search tools to filter by process type, certification, and location, or reach out directly to request a quote from companies that meet your needs. If your business provides certified heat treatment services and would like to be listed among the country’s top manufacturers, we invite you to register and apply for membership.