Top Heat Treating Suppliers in the USA

Heat treating sits at the core of American manufacturing, quietly enabling everything from automotive drivetrains and heavy equipment to aerospace components and medical devices. While often invisible to the end user, heat treating determines how metal performs in real-world conditions, affecting strength, wear resistance, fatigue life, and safety. As manufacturers push for tighter tolerances, longer part life, and more consistent quality, heat treating providers have become critical partners rather than downstream vendors.

This week’s report examines the current state of the U.S. heat treating sector, including how demand is evolving, where the industry is concentrated geographically, and which operational trends are shaping service providers nationwide. Using verified data collected directly by MNI, we also introduce the largest heat treating companies and highlight IndustryNet’s top heat treating suppliers supporting manufacturers across key industrial markets.

Key Facts on U.S. Heat Treating Suppliers

MNI, compiler and publisher of industrial business profiles for the U.S. industrial sector and informational engine behind IndustryNet, surveyed the nation’s more than 400 heat treating suppliers, directly collecting key data points on this essential industry.

• There are currently 421 suppliers of heat treating in the U.S.
• 13,939 workers are employed in this subset nationwide.
•  Employment amongst U.S. heat treating suppliers has grown 0.14% in the past year.
• Average reported sales for America’s heat treating suppliers stands at $2.3 billion.
• Heat treating companies in the U.S. are far less reliant on important, with 3% reporting they import raw materials (compared to 11% among all industrial companies)
• Meanwhile, 18% report international distribution.
•  The greater Midwest accounts for nearly half of America’s heat treating companies, encompassing 48%. The U.S. South follows, with 22%, while the East Coast accounts for 17%. The remainder (14%) are situated in the Pacific Mountain region.

What Is Heat Treating?

Heat treating is a controlled industrial process used to alter the physical and mechanical properties of metal without changing its shape. By heating and cooling metals under precise conditions, heat treaters improve hardness, toughness, ductility, and resistance to wear or fatigue. These processes are essential for components that must withstand stress, friction, pressure, or extreme temperatures.

Common heat treating methods include hardening and tempering for strength and durability, carburizing and nitriding to improve surface hardness, annealing to relieve internal stresses, and vacuum heat treating for clean, tightly controlled results. Heat treating is widely used in automotive, aerospace, defense, energy, agriculture, and industrial machinery applications, where part failure is not an option.

Because the process directly affects performance and safety, heat treating is highly specialized. Many providers operate under strict quality systems and certifications to meet customer and regulatory requirements.

Largest Heat Treating Suppliers in the U.S.

The largest heat treating companies in the United States are defined by scale, capacity, and technical depth. These operations typically run multiple facilities, operate dozens of furnaces, and support national or international customer bases. Their size allows them to handle high-volume production while maintaining the certifications and quality systems required by regulated industries. Here are the largest heat treating companies in the U.S., based on number of employees.

About the Largest Heat Treating Suppliers in the U.S.A.

• TC Industries, Inc.
  Crystal Lake, IL | 400 Employees

Founded in 1881, TC Industries is one of the longest-operating heat treating companies in the U.S. The company provides commercial heat treating and thermal processing services for alloy, low-carbon, and stainless steels, serving OEM manufacturers in the construction and mining sectors. In addition to heat treating, TC Industries produces wear components, ground engaging tools, cutting edges, and bucket edges. The company operates internationally and maintains AS9100 certification.

• Team Industrial Services, Inc.
  Pasadena, TX | 400 Employees

Team Industrial Services is a large regional provider of industrial services, including metal heat treating. Established in 1973, the company supports a broad range of industrial customers with thermal processing capabilities as part of its wider maintenance, repair, and inspection offerings. Its scale and geographic reach allow it to support complex, multi-site industrial operations.

• Bolttech Mannings, Inc.
  Theodore, AL | 200 Employees

Founded in 1989, Bolttech Mannings provides metal heat treating services to customers operating at both national and international levels. The company maintains ISO 9001 certification and focuses on consistent, process-driven thermal treatment solutions for industrial applications.

• Chem-Plate Industries, Inc.
  Elk Grove Village, IL | 200 Employees

Chem-Plate Industries specializes in metal heat treating and surface finishing services, including electroplating, mechanical zinc plating, dip-spin coatings, induction hardening, and high-corrosion passivation. Established in 1979, the company operates nationally and is TS 16949 certified, supporting automotive and engineered product manufacturers under the ArmorGald brand.

• Heat Treating Services Corp., Plant 1
  Pontiac, MI | 200 Employees

Heat Treating Services Corp. operates a high-volume heat treating facility focused on normalizing, oil quenching and tempering, annealing, and isothermal processing. Founded in 1978, the company also provides post-heat treating cleaning services for steel forgings and castings prior to machining. It serves customers nationwide and holds TS 16949 certification.

• Astro Aluminum Treating Co., Inc.
  South Gate, CA | 160 Employees

Astro Aluminum Treating specializes in aluminum heat treating and precision straightening services for complex components. Founded in 1967, the company operates internationally and holds AS9100 certification. Its capabilities support demanding applications that require tight dimensional control and consistent metallurgical performance.

• Brunner Wire Products, Inc.
  Elroy, WI | 150 Employees

Brunner Wire Products manufactures wire form products and special assemblies while also providing in-house heat treating and metal finishing services. Founded in 1963, the company serves customers nationwide and integrates thermal processing directly into its manufacturing workflow to ensure quality and performance consistency.

• Metals Technology
  Carol Stream, IL | 150 Employees

Established in 1963, Metals Technology is a national provider of metal heat treating services. The company operates with ISO 9001 certification and supports a wide range of industrial customers with controlled thermal processing solutions.

• Parker Trutec, Inc.
  Springfield, OH | 150 Employees

Parker Trutec provides metal coating and heat treating services, including gas ferritic nitrocarburizing, carburizing, carbon nitriding, salt bath nitriding, e-coating, and manganese phosphating. Founded in 1989, the company operates nationally and is ISO 9001:2015 certified. Its proprietary Isonite and Isonite Q processes are widely used in performance-critical applications.

• Team Industrial Services, Inc.
  Edwardsville, IL | 150 Employees

This Edwardsville facility supports Team Industrial Services’ regional operations with metal heat treating and nondestructive examination services. Established in 1979, the location plays a role in the company’s broader industrial service platform, supporting asset reliability and performance for industrial clients.

Key Trends Among U.S. Heat Treating Suppliers.

Demand for heat treating services continues to track closely with broader manufacturing activity, particularly in automotive, aerospace, defense, and heavy equipment markets. As reshoring and domestic production gain traction, manufacturers are leaning more heavily on U.S.-based heat treaters to reduce lead times and maintain tighter process control.

One of the most significant trends is the growing emphasis on precision and repeatability. Customers increasingly expect consistent results across large production runs, which has driven investment in automation, advanced furnace controls, and real-time process monitoring. Vacuum heat treating and low-pressure carburizing are gaining ground as manufacturers seek cleaner processes and tighter metallurgical control.

Certification and compliance requirements are also rising. Aerospace, defense, and medical manufacturers are pushing heat treaters to maintain ISO, AS9100, NADCAP, and customer-specific approvals. This has elevated the role of quality systems, documentation, and traceability across the industry.

Energy efficiency and environmental responsibility are becoming more important as well. Heat treating is energy-intensive by nature, and providers are upgrading furnaces, improving insulation, and optimizing cycle times to reduce operating costs and emissions. These investments are increasingly viewed as both a compliance necessity and a competitive advantage.

Finally, specialization is accelerating. Rather than offering every process under one roof, many heat treaters are focusing on niche capabilities such as nitriding, aluminum heat treatment, brazing, or exotic alloy processing. This allows them to serve high-value applications where expertise matters more than volume alone.

IndustryNet’s Top Heat Treating Suppliers

IndustryNet’s top heat treating suppliers represent the operational backbone of the industry. These companies range from regional specialists to multi-location providers, offering a wide array of heat treating services tailored to specific materials, industries, and performance requirements. Get to know them below.

Lone Star Heat Treating Corp.
Houston, TX

Lone Star Heat Treating Corp. provides commercial metal heat treating services to manufacturers across Texas and surrounding regions. The company supports a wide range of industrial applications, helping customers improve part durability, strength, and performance through reliable, production-focused heat treating processes.

Metal Treaters, Inc.
St. Paul, MN

Founded in 1948, Metal Treaters, Inc. is a long-established provider of vacuum and atmosphere heat treating services. Its capabilities include carburizing, induction heat treating, and stress relieving, with certifications that support aerospace, automotive, and industrial manufacturing requirements.

DOWA THT America, Inc.
Bowling Green, OH

DOWA THT America specializes in metal component heat treating for precision-driven industries. Operating under ISO 9001:2015 certification, the company supports customers who require consistent process control and documented quality systems for critical components.

Engineered Heat Treat, LLC
Madison Heights, MI

Engineered Heat Treat offers a broad portfolio of advanced thermal processing services, including gas carburizing, automated gas nitriding, vacuum heat treating, and neutral salt hardening. Serving industries such as aerospace, automotive, mining, and defense, the company brings decades of experience to complex metallurgical challenges.

Flame Metals Processing Corp.
Rogers, MN

Flame Metals Processing provides commercial heat treating services across a wide range of processes, from salt bath nitrocarburizing and carburizing to austempering and vacuum processing. Its diverse capabilities allow manufacturers to address both high-volume production needs and specialized applications.

Houston Heat Treat
Houston, TX

Houston Heat Treat serves manufacturers in one of the nation’s largest industrial hubs. The company provides metal heat treating services designed to support regional demand from energy, fabrication, and heavy equipment markets.

ThermTech
Waukesha, WI

ThermTech delivers a full suite of heat treating processes, including vacuum heat treating, carburizing, quenching, austempering, and press quenching. The company supports customers who require precise control over metallurgical outcomes and repeatable performance.

Astro Aluminum Treating Co., Inc.
South Gate, CA

Astro Aluminum Treating is a NADCAP-accredited and AS9100-certified processor specializing in aluminum heat treatment. With extensive furnace capacity and precision straightening expertise, the company plays a key role in supporting aerospace and complex aluminum component manufacturing.

Coleman Heat Treating, Inc.
Jacksonville, AR

Coleman Heat Treating provides comprehensive heat treating services for manufacturers across multiple industries. The company focuses on delivering dependable thermal processing solutions tailored to customer specifications.

Donohoo Steel Treating
Bettendorf, IA

Established in 1946, Donohoo Steel Treating has built a reputation around quality, reliability, and on-time performance. The company serves a range of industrial customers who depend on consistent results and disciplined process control.

hti Inc.
Logansport, IN

hti Inc. specializes in austemper heat treating and related services such as stress relieving and age hardening of beryllium copper. The company also offers metal finishing capabilities, allowing customers to consolidate multiple processes with a single supplier.

Nitro-Vac Heat Treat, Inc.
Warren, MI

Nitro-Vac Heat Treat is NADCAP accredited and focuses on advanced processes such as nitriding, vacuum hardening, and copper brazing. The company supports manufacturers with demanding quality and performance requirements, particularly in regulated industries.

Ohio Metallurgical Service, Inc.
Elyria, OH

Ohio Metallurgical Service has supplied heat treating services since 1947. With ISO 9001:2015 and aerospace quality accreditations, the company serves customers who require documented compliance and consistent metallurgical performance

Applied Thermal Technologies, Inc.
Warsaw, IN

Applied Thermal Technologies specializes in heat treating and brazing of stainless steel, titanium, and exotic alloys. Its validated processes support medical and aerospace manufacturers that operate under strict regulatory and performance standards.

Braddock Metallurgical – Tampa
Riverview, FL

Braddock Metallurgical operates multiple Florida locations, providing regional heat treating coverage across the state. The company supports a wide range of industrial customers with production-scale thermal processing services.

FPM Heat Treating, LLC
Elk Grove Village, IL

FPM Heat Treating offers metal heat treating services to manufacturers throughout the Midwest. Its operations focus on consistent processing and dependable turnaround for production and job shop customers alike.

Heat Treating Engineers, Inc.
Milwaukee, WI

Heat Treating Engineers provides steel and aluminum heat treating services, supporting manufacturers that require both ferrous and non-ferrous processing expertise. The company serves a broad base of industrial applications.

Midwest Thermal-Vac, Inc.
Kenosha, WI

Midwest Thermal-Vac specializes in advanced vacuum-based processes, including low-pressure carburizing, vacuum carbonitriding, high-pressure gas quenching, and plasma nitriding. Its technical capabilities support high-performance and precision-driven manufacturing.

Scientific Metal Treating Co., Inc.
Roselle, IL

Founded in 1964, Scientific Metal Treating focuses on quality, on-time delivery, and cost-effective heat treating services. The company operates under ISO 9001:2015 registration and serves a wide range of industrial customers.

Wyatt Services, Inc.
Sterling Heights, MI

Wyatt Services has provided quality heat treating since 1969. Operating under ISO 9001 certification, the company supports manufacturers that require consistent processing and dependable service.

Bulaw Welding & Engineering Co.
Itasca, IL

Bulaw Welding & Engineering combines production welding, brazing, and heat treating services under one roof. Founded in 1935, the company serves customers looking to integrate multiple fabrication and thermal processes efficiently.

Hi-Tech Steel Treating, Inc.
Saginaw, MI

Hi-Tech Steel Treating has operated for more than four decades, providing metal heat treating services to manufacturers across Michigan and beyond. The company focuses on dependable processing for industrial applications

Hy-Vac Technologies, Inc.
Detroit, MI

Hy-Vac Technologies delivers heat treating services with an emphasis on quality and performance. The company supports manufacturers that require controlled thermal processing for demanding applications.

Metals Technology
Carol Stream, IL

Metals Technology provides metal heat treating services for a variety of industrial customers. The company supports both production and specialty processing needs.

Precision Heat Treating, Inc.
Tulsa, OK

Precision Heat Treating focuses on metal part heat treating for manufacturers in the central United States. The company supports customers seeking reliable processing and consistent metallurgical outcomes.

Q-Tech Heat Treat, LLC
Dallas, TX

Q-Tech Heat Treat offers metal heat treating services to manufacturers throughout North Texas. The company supports a range of industrial applications requiring controlled thermal processing.

Solar Atmospheres
Multiple locations

Solar Atmospheres operates multiple facilities across the U.S., specializing in vacuum heat treating and brazing services. The company is widely known for its expertise in high-purity and controlled-atmosphere processing for aerospace, medical, and advanced manufacturing applications.

Southwest Metal Treating Corp.
Fort Worth, TX

Southwest Metal Treating brings decades of experience in precision heat treating. With multiple certifications and advanced processing capabilities, the company supports aerospace, defense, and industrial customers with complex requirements.

Specialty Steel Treating, Inc.
Farmington Hills, MI

Specialty Steel Treating focuses on precision-controlled heat treating services. The company serves manufacturers that require exacting metallurgical specifications and reliable repeatability.

Temperature Processing Co., Inc.
Longmont, CO

Temperature Processing provides metal heat treating services for manufacturers across the Rocky Mountain region. The company supports a range of industrial applications with dependable thermal processing solutions.

See all 400+ heat treating suppliers here.

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About This Data

MNI collects detailed information firsthand, making direct contact with each industrial company in the U.S to verify multiple data points about their business. While this data is used to power a variety of industrial solutions, it also yields key insights and statistics as a natural outcome of our hand-verified collection process.

This data forms the informational engine behind IndustrySelect, which offers real-time access to detailed company and executive profiles for sales, marketing, recruiting, and research. MNI data also powers IndustryNet, an industrial sourcing platform that connects buyers with industrial suppliers across thousands of product categories. Both platforms are designed to help professionals find accurate, up-to-date information for sales and business development, prospecting, and procurement.