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Heat Treatment Companies

Last updated: January 2026

This directory lists 105 heat treatment companies across the United States, from small, specialized vacuum processing shops to large, multi-furnace facilities handling high-volume atmospheric processes.

Buyers utilize these services to fundamentally alter material properties, addressing needs like increasing surface hardness for wear resistance, improving fatigue life, enhancing corrosion resistance, or relieving internal stresses. The goal is often to achieve precise microstructures, optimize tensile strength, prevent issues like decarburization, and manage potential distortion that can arise from thermal cycling.

Suppliers in this space vary significantly, ranging from general job shops offering a broad spectrum of atmospheric furnace operations like carburizing and tempering, to highly specialized facilities focusing solely on advanced processes such as plasma nitriding, vacuum heat treatment, or induction hardening for specific material types or applications. Some also offer integrated services like cryogenics or specialized straightening.

To ensure a successful partnership, buyers should come prepared with clear material specifications, desired final hardness (e.g., HRC, HV), required case depth, acceptable distortion limits, and any post-treatment inspection criteria. Suppliers, in turn, expect detailed part drawings, material certifications, and a clear understanding of the component's end-use application to recommend optimal process parameters.

A notable trend in the heat treatment sector is the increasing demand for enhanced process control and automation, driven by stricter quality requirements and the pursuit of energy efficiency. This includes sophisticated real-time monitoring of furnace atmospheres, precise temperature uniformity controls, and the integration of digital twins for predictive maintenance and optimized thermal cycling, often pushing towards cleaner processes like high-pressure gas quenching.

105 companies·76 emails·93 phones

Company Directory

105 companies nationwide

Ansonia, CT

Based in Ansonia, CT, A1 Heat Treating provides specialized heat treatment services with over 35 years of experience. The company focuses on processing tool and die components, high-speed steels, and offering precision straightening services for industrial applications.

South Gate, CA

Based in South Gate, CA, Accurate Steel Treating is an aerospace heat treating company. They offer a range of thermal processing services including open fire, endo, vacuum, air, gas nitride, ion nitride, and salt to salt quenching. The company is Nadcap accredited and approved by major aerospace manufacturers.

Aerocraft Heat Treating, founded in 1959, is an independent commercial heat treater. They specialize in steel, titanium, and high temperature materials, processing forgings, castings, bar, plate, and rough-machined parts. Services support aircraft engine and structural components, backed by Nadcap and AS9100/ISO9001:2015 certifications.

Akron, OH

Akron Steel Treating Company provides commercial heat treating services to the manufacturing industry from its facility in Akron, Ohio. Specializing in processes like annealing, normalizing, carburizing, carbonitriding, neutral hardening, and induction hardening, the company has served clients since 1957, offering various solutions for metal components.

Lafayette, LA

Analytic Stress Relieving, Inc. provides comprehensive heat treating solutions, tailoring services to customer needs. The company offers a full spectrum of heat treatment methods and innovative wireless technology through its nationwide network. Serving diverse industries since 1979, it focuses on quality, safety, and performance.

South Gate, CA

Based in South Gate, CA, Astro Aluminum Treating Co Inc provides comprehensive heat treatment services with over 50 years of industry experience. The company utilizes 19 ovens and furnaces for precise material treatment. Additionally, it offers straightening services to mitigate distortion caused by the heat treating process.

Huntington Beach, CA

Based in Huntington Beach, CA, Axiom Heat Treatment provides on-site heat treatment services. Specializing in electrical resistance, combustion, and induction, the company utilizes its patent-pending Axi-Therm Blended Heating & Cooling technology. Their methods reduce costs, improve schedules, and quickly return metals to production.

Cleveland, OH

Buckeye Aluminum Foundry, Inc. is a manufacturing company specializing in non-ferrous metal casting and comprehensive heat treatment services. Operating from its own facilities in Cleveland, OH, the company provides casting and thermal processing for various industrial applications.

Burbank, CA

Burbank Steel Treating Inc, based in Burbank, CA, specializes in metal heat treating and world-class thermal processing services. They serve the Aerospace, Military, Automotive, Electronic, and Medical industries. As experienced Southern California heat treating specialists, they ensure the job is done to exact specifications.

Santa Clara, CA

Based in Santa Clara, CA, Byington Steel Treating provides expert heat treating, surface hardening, cryogenics, and metal forming services. For over 70 years, they have served the aerospace, electronics, automotive, and medical industries, offering precision heat treatment to ensure part performance and longevity.

Fairfield, OH

Based in Fairfield, OH, Byron Products specializes in thermal processing, including vacuum, atmosphere, tempering, and localized stress relieving heat treatment. With 40+ years experience, they provide brazing and welding for diverse industries, handling prototypes to high-volume production. NADCAP and AS9100D certified.

Haltom City, TX

Centex Lab, established in 1984, provides heat treatment and testing services for non-ferrous aluminum and magnesium components. Specializing in solution, aging, and stress relief, the company also offers chemical processing and non-destructive testing. Serving aerospace manufacturers, foundries, and machine shops nationwide, Centex Lab holds NADCAP accreditations for its quality system and services.

Cleveland, OH

Commercial Steel Treating, based in Cleveland, OH, operates as a direct provider of industrial heat treatment services. The company specializes in steel treating, utilizing its own facilities and equipment to process commercial steel components. They offer a range of services to meet various industry demands.

Santa Fe Springs, CA

Continental Heat Treating, Inc., based in Santa Fe Springs, CA, provides expert thermal processing services, altering metal structural composition to precise properties. They employ advanced equipment and experienced personnel, serving aerospace, defense, energy, electronics, and transportation industries. The company is NADCAP accredited, ensuring high-performance and technical reliability.

Maywood, CA

Based in Maywood, CA, Cook Induction Heating Co. specializes in heat treating and brazing services. The company holds Nadcap Merit status for its quality systems, particularly serving the demanding aerospace industry. They have maintained Nadcap accreditation since 2005.

Torrance, CA

Controlled Thermal Processing Inc., based in Torrance, CA, specializes in thermal processing services. The company removes manufacturing stresses and enhances material properties like tensile strength, toughness, and ductility. They also improve cutting properties of tool steels, including HSS and carbide.

Huntington Beach, CA

Based in Huntington Beach, CA, Delta Heat Treating provides comprehensive heat treating and brazing services. They serve diverse industrial sectors including aerospace, defense, medical, oil and gas, electronics, and manufacturing. The company maintains a controlled quality control system, ensuring work adheres to strict specifications and client requirements.

Cincinnati, OH

Based in Cincinnati, OH, Derrick Company Inc. provides comprehensive heat treating services, specializing in large, heavy parts while also handling medium and small components. Their offerings include stress relieving, annealing, normalizing, and specialized aluminum heat treating. The company also offers abrasive blasting and industrial spray painting services.

Detroit, MI

Detroit Flame Hardening Co., founded in 1941, specializes in flame hardening and other heat treatment services. Headquartered in Detroit, MI, with locations in Cleveland and Cincinnati, they provide precise, localized hardening solutions. The company serves a variety of industries nationwide, minimizing distortion and reducing processing time.

Based in Hermitage, PA, ELLWOOD Commercial Heat-Treating provides expert heat treatment services, including normalize and anneal, for industrial applications. They utilize advanced facilities with precision controls, ensuring accuracy and quick turnaround. The company also offers comprehensive machining solutions.

Euclid, OH

Based in Euclid, OH, Euclid Heat Treating has provided specialized heat treating services and secondary operations since 1946. Their capabilities include induction hardening, case hardening, vacuum processing, and quench & temper. They serve industrial clients in the medical, military, automotive, tool & die, and locomotive industries.

Lebanon, OH

Based in Lebanon, OH, Franklin Brazing provides comprehensive metal treating services, including expert brazing and annealing. The company focuses on ensuring smooth manufacturing processes by delivering reliable services, helping clients avoid production line shutdowns and meet their commitments effectively.

Fort Worth, TX

Har-Conn Aerospace provides specialized heat treating and brazing services for critical aerospace components. Based in Fort Worth, TX, the company offers various thermal processing solutions, specifically tailored to the stringent requirements of the aerospace industry, holding Nadcap accreditations.

Montclair, CA

Based in Montclair, CA, High Speed Steel Treating Co. INC operates as a full-service heat treatment facility. The company provides quality and dependable services, drawing on over 60 years of combined practical experience. HSST is committed to meeting customer requirements and continually improving through technological advancements.

Eastlake, OH

Based in Eastlake, OH, HI TecMetal Group Inc. provides comprehensive metal treatment, heat treating, brazing, and welding services. Operating from five specialized locations across Northern Ohio, the company supports diverse industries including aerospace, transportation, industrial, and manufacturing, with accredited facilities.

Lima, OH

Based in Lima, OH, Heat Treating Technologies Inc provides specialized industrial heat treatment services. The company utilizes advanced processes and equipment to enhance the properties of metal components for various manufacturing applications.

Elkhorn, WI

Based in Elkhorn, WI, Hudapack Metal Treating, Inc. provides high-quality commercial heat treating solutions across its three-plant operation. The company offers a full range of services, including atmosphere hardening, carburizing, induction hardening, annealing, induction fastener heating, vacuum processing, aluminum processing, and nitriding.

Jackson, MI

Based in Jackson, MI, Industrial Steel Treating Company offers comprehensive heat treating services for manufacturers. With over 80 years of experience, the company operates one of the largest steel heat treating facilities in the United States. It specializes in induction hardened steel fasteners and is ISO 9001:2015-QMS certified.

Salt Lake City, UT

Based in Salt Lake City, UT, Industrial Heat Treat, LLC has provided quality heat treating services for metal components since 1971. The company offers expertise in various metal treating processes, focusing on rapid turnaround for diverse industries including machine shops, process equipment, and construction equipment.

Corpus Christi, TX

Based in Corpus Christi, TX, Industrial Thermal Services, LLC specializes in industrial heat treatment, including Post Weld Heat Treatment (PWHT) and furnace heating. They provide stress relief, eliminate residual stresses, and restore physical properties of weldments. Services aim to enhance structural integrity, prevent fracturing, and improve resistance to corrosion and cracking.

Kansas City, KS

JASCO Heat Treating provides a comprehensive array of commercial and industrial heat treatment services from its Kansas City, KS facility. Specializing in processes like carburizing, carbonitriding, hardening, and tempering, the company also offers abrasive blasting and metallurgical testing to diverse industries.

West Lafayette, OH

Based in West Lafayette, OH, Jones Metal Products Company provides comprehensive metal forming and fabrication services. Specializing in custom heat treating, hydroforming, fluid cell forming, precision machining, and metal rolling, the company serves demanding sectors. They offer solutions for aerospace, defense, rocket mounting systems, and space power generation applications.

Houston, TX

Based in Houston, TX, K & D Heat Treat Inc. is a direct provider of industrial heat treating services, established in 1990. The company offers specific furnace sizes and metal shot blasting capabilities. They operate 24 hours a day, 7 days a week, serving manufacturing clients with their heat treatment needs.

Houston, TX

Lark Heat Treating, based in Houston, TX, provides extensive metal heat treatment services. Offerings include carbonitriding, carburizing, gas nitriding, stress relieving, solution anneals, and quench and temper. Founded in 1978, the company serves diverse industrial clients, from local machine shops to the international petroleum industry.

Longmont, CO

Legacy Heat Treatment provides specialized heat treatment services for industrial components. Based in Longmont, CO, the company offers various processes to enhance material properties, including hardening, tempering, annealing, and stress relieving. They serve a range of manufacturing industries requiring precise metallurgical solutions.

Houston, TX

Based in Houston, TX, Lone Star Heat Treating Corp offers industrial heat treating services such as batch, vertical, controlled atmosphere, and induction hardening. They also provide mechanical and non-destructive testing. Certified to AS 9100, ISO/IEC 17025, and with AMS 2750 surveyed furnaces, they deliver quality solutions consistently since 1945.

Longview, TX

Based in Longview, TX, LST Heat Treating offers comprehensive heat treatment services for diverse industrial applications. The company is ISO 9001 certified and a member of MTI, complying with various industry standards. They serve sectors such as agricultural, heavy equipment, machine tool, oil and gas, metalworking, and automotive.

Conroe, TX

Magnum Metal Treating Inc., based in Conroe, TX, specializes in comprehensive heat treatment services for industries including oil & gas, automotive, heavy equipment, and aerospace. They offer processes like carburizing, carbonitriding, normalizing, annealing, quenching & tempering, stress relieving, and induction hardening, utilizing advanced batch and continuous furnaces.

Huntington Beach, CA

Mil-Spec Heat Treating specializes in providing professional heat treatment services. The company focuses on processes that meet stringent military specifications, catering to industrial and commercial clients requiring high-quality metallurgical enhancements for critical components.

Richland Hills, TX

Based in Richland Hills, TX, Modern Heat Treat is a full-service commercial heat treater. They provide a range of heat treatment services including hardening, carburizing, carbonitriding, stress relieving, normalizing, annealing, tempering, and sub-zero treatment. Additional offerings include shot blasting, straightening, and comprehensive lab services.

Houston, TX

Based in Houston, TX, National Heat Treat is a direct provider of heat treatment services. The company specializes in various thermal processing techniques, enhancing the metallurgical properties of components for industrial and commercial applications.

Fontana, CA

National Thermal Processing, based in Fontana, CA, provides comprehensive heat treatment services for industrial clients. Their capabilities include heat treating, annealing, neutral hardening, blasting, and hardness testing. The company focuses on processing various metals to enhance their properties and ensure material integrity.

Based in Hamilton, OH, Neturen America Corporation specializes in manufacturing high-quality induction heat-treated (IHT) steel bars and wire rod. The company produces specialized steel for automotive suspension systems, including coil springs, torsion bars, and stabilizer bars, serving the North American market.

City Of Industry, CA

Newton Heat Treating Co., Inc. provides specialized aluminum heat treatment services nationwide from its City of Industry, CA facility. Capabilities include quenching using glycol, cold water, hot water, or spray methods. They also offer cold stabilization, thermal cycling, and straightening services for aluminum alloys.

Elyria, OH

Based in Elyria, OH, Ohio Metallurgical Service, Inc. has provided heat treat services since 1947. The company specializes in creating unique, highly engineered heat treat processes for the manufacturing industry, ensuring quality and customer satisfaction.

Corpus Christi, TX

Onsite Stress Relieving Services Inc. specializes in Post Weld Heat Treatment (PWHT), often called stress relief, for industrial applications. Their services utilize furnace heating to increase structural integrity, prevent fracturing, and eliminate residual stresses in weldments, reducing hardness and enhancing corrosion resistance.

Phoenix, AZ

Based in Phoenix, AZ, Phoenix Heat Treating specializes in resolving complex heat treatment problems. They offer a wide array of services including vacuum, aluminum, salt, atmosphere processing, nitriding, stress relieving, and metal finishing. The company is dedicated to providing unique solutions to meet diverse customer requirements.

Tulsa, OK

Based in Tulsa, OK, Precision Heat Treating is a locally owned company providing heat treatment services. They focus on client care, ensuring safety and quality in the final product to meet customer needs and sustain equipment life for various projects.

Valencia, CA

Based in Valencia, CA, Metal Plasma Technology specializes in Ion Plasma Nitriding and Nitrocarburizing. They provide case hardening for diverse steel alloys, producing strong, non-brittle surfaces with minimal distortion. NADCAP accredited since 2003, they serve aerospace, defense, power generation, oil & gas, automotive, and medical industries.

Youngstown, OH

Based in Youngstown, OH, P&L Heat Treating provides advanced heat treatment services. The company delivers precision, consistency, and reliability through state-of-the-art equipment and expert technicians. They partner with clients to create durable, high-performing parts and smart solutions tailored to specific needs.

Cincinnati, OH

Based in Cincinnati, OH, Queen City Steel Treating Co. provides a range of heat treating capabilities including carburizing, carbonitriding, neutral hardening, quench & temper, normalizing, annealing, stress relieving, and ferritic nitrocarburizing. They serve diverse industries such as automotive, commercial vehicle, agricultural, construction equipment, mining, appliance parts, and military, and are ITAR compliant.

Burbank, CA

Based in Burbank, CA, Quality Heat Treating, Inc. specializes in advanced thermal processing, altering the structural composition of metals to precise metallurgical properties. They perform carefully controlled heating and cooling of various alloy combinations for critical components. Serving aerospace, defense, and electronics, the company is NADCAP accredited.

Based in Lansdale, PA, Rex Heat Treat provides commercial heat treating services from two cutting-edge facilities. Established in 1938, their capabilities include austempering, carburizing, hardening & tempering, solution treating, aging, and vacuum heat treating. They serve aerospace, medical, defense, and transportation industries with 24/7 operations.

Based in East Petersburg, PA, Richter Precision offers vacuum heat treating services from its facilities in PA, MI, and KY, utilizing positive pressure quenching. The company also specializes in PVD and CVD thin-film coating technologies, providing diverse solutions to enhance the performance and longevity of tools and components.

Chesterfield, MI

Solar Atmospheres provides vacuum heat treating and brazing services with over 90 furnaces across seven US locations. They offer extensive commercial vacuum furnace capacity, handling parts up to 48 feet and 150,000 lbs. Services cater to aerospace, medical, and additive manufacturing sectors, operating 24/7.

Houston, TX

Based in Houston, TX, Southern Stress provides comprehensive heat treatment services utilizing advanced technologies for material optimization. Their offerings include preheating, post-weld heat treatment, bake-out, Brinell hardness testing, line thaw, and refractory dryout. They focus on precision, strength, and reliability for industrial applications.

Fort Worth, TX

Based in Fort Worth, TX, Southwest Metal Treating offers advanced NADCAP heat treating solutions, utilizing cutting-edge furnace technology. With over 40 years of experience, they improve durability and strength for industrial clients in cutlery, hand tool, industrial machinery, and turbine manufacturing.

Houston, TX

Specialty Heat Treat, Inc. provides advanced industrial metal heat treatment services from its Houston, TX facility. Specializing in processes like annealing, hardening, tempering, normalizing, quenching, and stress relieving, the company serves demanding sectors including oil and gas, aerospace, and automotive with state-of-the-art equipment.

Cincinnati, OH

Based in Cincinnati, OH, The Cincinnati Steel Treating Company is an outsourcing partner for a comprehensive range of heat treatment services. With over 80 years of experience, they specialize in processes such as carburizing, nitriding, annealing, hardening, and stress relieving, serving various industries to improve parts performance.

Aurora, CO

Based in Aurora, CO, Superheat provides on-site heat treatment services, utilizing advanced electrical resistance SmartWay™ and induction technologies. The company also offers induction heat treatment equipment for rental, lease, and sales, aiming to deliver better, safer, and faster solutions for industrial heat treatment needs across 25 facilities worldwide.

Round Rock, TX

Based in Round Rock, TX, Texas Heat Treating, Inc. provides comprehensive heat treatment services, notably for the aerospace industry. The company holds certifications including AS9100D, ISO 9001, and ISO 17025 accreditation. They ensure compliance with rigorous industry standards, best practices, and customer requirements, incorporating Nadcap for critical applications.

La Porte, TX

Based in La Porte, Texas, Texas Stress, Inc. specializes in high-quality preheating, post-weld heat treatment (PWHT), and furnace heat treatment services. They offer both on-site and in-house capabilities for various industrial applications, ensuring material integrity and preventing stress-related failures.

Pelham, AL

Based in Pelham, AL, Precision Heat Treating Corp. provides commercial heat treating services. The company supports a variety of industries and applications across the United States, offering specialized thermal processing solutions to meet diverse client needs.

Hayward, CA

Based in Hayward, CA, ThermoFusion Inc. provides comprehensive heat treating and brazing services. They specialize in annealing, carburizing, nitriding, and stress relieving, alongside aluminum secondary operations. The company operates 24 hours Monday through Friday and is Nadcap certified, serving industrial clients.

Waukesha, WI

Based in Waukesha, WI, ThermTech is a privately held commercial heat-treating company. They provide a comprehensive range of heat treatment services, catering to a diverse and discerning customer base across various industries. Their offerings ensure material property enhancements for industrial applications.

Longmont, CO

Based in Longmont, CO, Temperature Processing Colorado, Inc. offers heat treatment services like cryogenics, bright hardening, and brazing. Certified for aerospace, nuclear, military, and medical applications, they provide custom solutions and a metallurgy lab for commercial and private clients.

Pomona, CA

Based in Pomona, CA, Tri-J Metal Heat Treating Inc. has provided full-service metal heat treatment since the 1940s. Certified to ISO 9001:2015 and AS9100:2016, they offer neutral hardening, carburizing, austempering, annealing, stress relieving, and more. Services handle alloy, carbon, stainless, and tool steels, with possible 24-hour turnaround.

Cleveland, OH

Based in Cleveland, OH, USA Heat Treating provides commercial heat treatment services to the manufacturing industry. Established in 2002, they specialize in processes such as continuous austemper, neutral-hardening, and stress relieving. The company is ISO 9001 certified and meets IATF automotive supplier requirements, emphasizing quality and efficient turnaround.

Based in Quakertown, PA, Vacu Braze Inc provides specialized vacuum heat treating and brazing services. The company also offers atmospheric heat treating, cryogenic treatment, and metallurgical consulting. Serving North America, Vacu Braze caters to medical, defense, aerospace, nuclear, and additive manufacturing industries.

Garden Grove, CA

Based in Garden Grove, CA, Varco Heat Treating Company provides reliable metal heat treating services. Established in 1908, the company offers high-quality solutions tailored to project needs. They are NADCAP, ISO 9001:2015, and AS9100D accredited, ensuring excellence and adherence to industry standards.

Dayton, OH

Winston Heat Treating Inc., based in Dayton, OH, has provided heat treatment services since 1967. Specializing in vacuum heat treating, case hardening, and gas nitriding, the company serves diverse industries including aerospace, automotive, medical, and tooling. They hold NADCAP and ISO accreditations.

Houston, TX

Worldwide Heat Treat, based in Houston, TX, provides comprehensive industrial heat treating services. Capabilities include hardening, quenching, tempering, metallurgy, hardness testing, and sandblasting. The company utilizes enhanced 40-foot furnaces, capable of processing larger materials, to serve clients in the Houston area and surrounding regions.

Fremont, CA

Bodycote is the world's largest provider of heat treatment and specialist thermal processing services, serving diverse industrial sectors including aerospace, automotive, energy, and medical. Operating numerous facilities across the United States, the company offers a comprehensive range of critical heat treatment processes like carburizing, nitriding, induction hardening, and vacuum heat treatment to enhance material properties.

Fraser, MI

Based in Fraser, MI, Engineered Heat Treat, LLC has provided special process heat treating services since 1959. The company focuses on high-quality service and customer satisfaction, operating with state-of-the-art, advanced technology in house. They offer a variety of heat treatment processes for metallurgically engineered parts.

Santa Fe Springs, CA

HTA Los Angeles, based in Santa Fe Springs, CA, provides advanced heat treatment and metallurgical services. With over 50 years of expertise, they specialize in Cryotemp® Processing, Vacuum Brazing, and Precipitation Hardening. The company also offers ASTM E18 laboratory testing, serving industrial clients with comprehensive thermal processing solutions.

Based in North Attleboro, MA, S.M. Engineering & Heat Treating offers comprehensive commercial heat treatment services. They specialize in processes like annealing, carburizing, carbonitriding, and hardening & tempering, enhancing material properties for a wide range of industrial applications and components.

Aalberts Heat Treatment provides technologically advanced heat treating services, specializing in surface technologies for material handling components. Their processes are applicable to a wide range of component sizes, offering robust solutions for industrial applications.

Advanced Heat Treat Corp. provides commercial heat treat services and metallurgical solutions for industrial applications. Offering over 20 surface treatment options, the company specializes in addressing wear, corrosion, and abrasion issues to enhance part strength. AHT operates from four locations across Iowa, Michigan, and Alabama.

Applied Thermal Technologies, Inc. is a metal processing company specializing in bright vacuum heat treating and brazing of stainless steel and exotic alloys. Since 1992, they have offered industrial solutions for medical, orthopedic, aerospace, military, food handling, and stamping industries. The company maintains Nadcap™ accreditation and provides validation engineering services.

Greenville, SC

Bluewater Thermal Solutions provides a wide array of metal heat treating processes from seven U.S. locations. The company offers diverse thermal processing solutions for metal components, serving various industrial clients. It is also NADCAP accredited, ensuring high-quality services for critical applications.

Ogden, UT

High Desert Heat Treating LLC, based in Ogden, UT, provides comprehensive thermal processing services for industrial applications. They specialize in a variety of heat treatment processes designed to enhance material properties, including carburizing, nitriding, annealing, hardening, and tempering. The company serves manufacturing clients requiring precise and high-quality metallurgical solutions.

La Porte, TX

HTS AmeriTek provides expert on-site and off-site metal heat treating services, including post-weld heat treatment, for stainless steel, aluminum, and various alloys. The company serves industries such as refinery, fabrication, petrochemical, maintenance, and pipelines, operating from locations in Texas, Montana, and Louisiana.

Pontiac, MI

HTSMI provides heat treatment services to large-volume manufacturers and machiners in the United States. They specialize in addressing the specific needs of clients working with rough castings and forgings, aiming to resolve common frustrations in the heat treating process.

Detroit, MI

Hy-Vac Technologies Inc. provides comprehensive commercial heat treating services, including aluminum, vacuum, and controlled atmosphere heat treating, along with furnace brazing, bright annealing, and sintering. Based in Detroit, MI, the company serves the aerospace, military/defense, automotive/heavy truck, and medical industries with thermal processing expertise.

Orange, CA

Pacific Aerodynamic Inc., based in Orange, CA, specializes in repairing and overhauling jet engine compressor blades and vanes. They provide a better OEM alternative, offering high-quality services including vacuum heat-treat and welding. Serving airlines and overhaulers, the company restores components to OEM standards with extensive aerospace experience.

Sunnyvale, CA

Based in Sunnyvale, CA, Pacific Heat Treating Co. provides specialized heat treatment services. They are recognized for high-quality craftsmanship, exceptional customer service, and reliable turnaround times for various products. The company offers complimentary pickup and delivery, aiming for efficiency and client satisfaction.

St. Louis, MO

Based in St. Louis, MO, Paulo is a commercial thermal processing company specializing in precise, repeatable heat treatment for mission-critical parts. They serve advanced manufacturers in aerospace, automotive, and other industries, offering a wide range of services for both simple and complex processing needs.

Clintonville, WI

Precision Thermal Processing offers thermal processing services, including heat treating, normalizing, annealing, stress relieving, and hardening. The company provides metallurgical analysis, serving industrial clients in transportation and tool & die sectors. It holds ISO 9001 and ISO 17025 accreditations.

Dallas, TX

Based in Dallas, TX, Q Tech Heat Treat Inc. offers comprehensive heat treating services, including vacuum heat treating, precipitation hardening, tempering, and annealing. Utilizing state-of-the-art furnaces, they serve demanding industries like aerospace, oil & gas, automotive, and medical, providing precise material property enhancement.

Orange, CA

Based in Orange, CA, Scarrott Metallurgical Company provides high vacuum heat treating and brazing services. The facility specializes in processing aerospace and medical grade materials, ensuring pristine and clean atmospheres for critical thermal production processes. They are ITAR, SAM, and JCP registered.

Cranston, RI

Based in Cranston, RI, Spectrum Thermal Processing is a Nadcap accredited company specializing in thermal processing. They provide a comprehensive suite of services including brazing, hardening, annealing, aging, cryogenic freezing, quenching, vacuum carburizing, and gas nitriding for the automotive, aerospace, and electronics sectors.

Farmington Hills, MI

Based in Farmington Hills, MI, Specialty Steel Treating is an ISO certified metal and steel heat treatment company with over 60 years of experience. They provide services including case hardening, tempering, carburizing, quenching, and vacuum heat treatments for industries such as aerospace, rail, and automotive.

South El Monte, CA

Based in South El Monte, CA, Supreme Steel Treating Inc. provides comprehensive heat treatment services since 1982. Capabilities include hardening for tool steels and alloys, induction hardening, annealing, precipitation hardening, stress relieving, tempering, carburizing, carbonitriding, normalizing, homogenizing, and cryogenic treatment, with free pickup and delivery.

Greenville, SC

Southwest Heat Treat provides industrial heat treatment services, specializing in processes such as annealing, hardening, tempering, and carburizing. This NADCAP accredited company offers various metal heat treating solutions for diverse components and industries. It operates as part of the Bluewater Thermal group.

Orange, CA

Thermal-Vac Technology, Inc. provides vacuum heat treating, brazing, and coating services, primarily for the aerospace and defense industries. The company handles extreme environments and exacting tolerances for critical components. They are NADCAP approved for brazing and heat treating, ensuring high quality for demanding applications.

Sacramento, CA

Vacuum Process Engineering, Inc. (VPE) is a thermal engineering and manufacturing company based in Sacramento, CA. VPE provides science-based metallurgical services including precision brazing, diffusion bonding, hot pressing, and heat treating. They also offer thin film coating and complex assemblies for aerospace, medical, and semiconductor industries.

Grand Ledge, MI

Zion Industries, Inc. provides induction heat treating and process development for metal parts. With facilities in Ohio, North Carolina, and Michigan, the company specializes in high-volume heat treatment production, including aluminum age hardening. They utilize induction heating to harden, soften, or bond metals.

Cleveland, OH

Based in Cleveland, OH, General Metal Heat Treating offers comprehensive heat treatment services. Specializing in processes like annealing, normalizing, hardening, and tempering, the company enhances the properties of various metals. Serving industrial clients, they provide solutions from their US-based facilities, ensuring improved material performance.

Brooklyn, NY

Hercules Heat Treating Corporation, based in Brooklyn, NY, provides comprehensive heat treatment services, including case hardening, carbonitriding, nitriding, through hardening, annealing, and stress relieving. Serving the New York Metropolitan area since 1957, the company focuses on quality and precision for diverse industrial needs.

Houston, TX

Houston Heat Treat, based in Houston, TX, provides comprehensive thermal processing services. Specializing in various heat treatment processes, the company serves industrial clients needing enhanced material properties, including strength and durability. They cater to sectors like oil & gas and general manufacturing.

Peninsula, OH

Based in Peninsula, OH, Induction Hardening Specialists provides expert induction hardening services, specializing in gear teeth. They offer custom orders to client specifications, prioritizing timely service and quality workmanship. Their highly trained staff supports diverse industries, enhancing material properties through advanced heat treatment processes.

Berthoud, CO

Based in Berthoud, CO, Metalex Thermal Specialties is a NADCAP and AS9100 accredited commercial heat treatment provider. They specialize in a comprehensive range of thermal processing capabilities, including vacuum brazing, vacuum heat treatment, neutral atmosphere heat treatment, cryogenic treatment, tempering, and stress relieving, serving diverse industrial sectors.

Based in Meadville, PA, Peters' Heat Treating, Inc. provides comprehensive metallurgical and thermal processing solutions. Services include vacuum heat treating, carburizing, nitriding, stress relieving, annealing, and cryogenic processing. They serve critical industries like aerospace, automotive, defense, medical, and tool & die.

Fort Wayne, IN

Precision Heat Treating Corporation, located in Fort Wayne, IN, specializes in a wide array of industrial heat treatment services. The company performs metallurgical processes to enhance the strength, durability, and performance of various metal components. They serve manufacturing clients across diverse sectors, ensuring high-quality and precise material property modifications.

North Baltimore, OH

Progressive Metal Service offers specialized metal heat treatment and finishing services, prominently featuring comprehensive gas and ion nitriding. Based in North Baltimore, OH, they enhance surface hardness and wear resistance for industrial components. Additional treatments include black oxide, shot peening, and phosphating, providing tailored solutions.

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How to Choose a Company

  • Verify they have the specific furnace type (e.g., integral quench, vacuum, pit furnace) and atmosphere control (e.g., endothermic gas, nitrogen, argon) required for your material and process (e.g., carburizing, nitriding, solution annealing), ensuring correct part geometry and desired metallurgical outcome.
  • For critical applications like aerospace or medical, require NADCAP AC7102 for heat treating or CQI-9 for automotive, and inquire about their internal process control documentation, traceability protocols, and whether they perform in-house metallurgical testing (e.g., microhardness, case depth verification).
  • Discuss their approach to part distortion and ask about their fixturing capabilities; a red flag is a supplier who dismisses concerns about warpage or doesn't have experience with complex geometries, as inadequate fixturing or quenching strategies can lead to costly rework or scrap.
  • Evaluate their capacity for the volume you need, their typical lead times for your specific process, and if they offer complementary services like blasting, straightening, or surface finishing, which can streamline your supply chain and reduce handling damage.

Supplier Types at a Glance

TypeBest ForTypical MOQ
General Job ShopDiverse small-to-medium batch runs, prototypes, varied material types requiring common atmospheric processes.Low to Medium (1-1000s)
Specialized Vacuum/Ion Nitriding ShopHigh-precision components, aerospace, medical, tool & die, or parts requiring minimal distortion, clean surfaces, and specific case properties.Medium (50-1000s)
High-Volume Production FacilityLarge-scale manufacturing, automotive, construction equipment, consumer goods requiring consistent quality and throughput.High (1000s+)
Metallurgical Engineering Firm (with HT capabilities)Complex R&D projects, failure analysis, exotic alloys, critical component development needing material science expertise alongside processing.Very Low (1-50)

Frequently Asked Questions

How does quenching media choice impact the final properties and distortion of heat-treated parts?

The selection of quenching media—such as oil, water, polymer solutions, salt, or high-pressure gas—critically influences a part's final hardness, toughness, and residual stress. Each medium cools at a different rate; faster cooling generally yields higher hardness but also increases the risk of excessive distortion or cracking, especially in complex geometries or sensitive alloys. A knowledgeable supplier will balance your hardness requirements with the need to minimize distortion by carefully selecting the appropriate quenching strategy and part fixturing.

What are the most common causes of heat treatment rework or rejection, and how can they be avoided?

Common causes for rework or rejection include excessive distortion or warpage, insufficient or excessive case depth, decarburization (loss of carbon from the surface), cracking, or incorrect final hardness. These often stem from improper material specifications, inadequate process control, incorrect fixturing, or poorly optimized quenching. They can be avoided by providing precise material and process specifications to your supplier, ensuring they have robust process control, comprehensive inspection protocols, and metallurgical oversight to verify outcomes against design requirements.

When is NADCAP certification critical for a heat treatment supplier, and what does it signify?

NADCAP (National Aerospace and Defense Contractors Accreditation Program), specifically its AC7102 standard for heat treating, is critical for suppliers serving the aerospace, defense, and other highly regulated industries where part failure can have catastrophic consequences. This certification signifies that a supplier has undergone rigorous, independent third-party audits of their quality systems and heat treatment processes, demonstrating adherence to stringent industry-specific standards for process control, traceability, equipment calibration, and personnel training, far exceeding general ISO certifications.

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