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Case Hardening Companies

IQS Directory is a top industrial directory listing of leading industrial case hardening companies. Access our comprehensive index to review and source case hardening companies with preview ads and detailed product descriptions. These case hardening companies can design,engineer and provide case hardening services to your specifications and application need. A quick and easy to use request for quote form is provided for you to contact these case hardening companies. Each company has detailed profile information, locations, phone number, website links, product videos and product information defined. Read customer reviews and product specific news articles. We are the right resource for your information requirement whether its for a provider of hi speed-it case hardening, case hardening of steel, nitride hardening.

  • Gastonia, NC 704-864-0998

    Our name implies what we do. At JF Heat Treating we specialize in heat treating for metal, induction hardening, tempering to soften, aging, quenching, stress relieve, steel heat treating and more. Some of our other services include: shot blasting, peening and cleaning services.

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  • Smiths Creek, MI 586-716-4700

    Our two facilities can handle induction heat treating for your products. Magnum concentrates on controlled hardening of gear-, pin- and shaft-type parts; plus case hardening of depths 1-20+mm. Our Induction Engineering facility also does induction heat treating for production runs. ISO/TS 16949:2002.

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  • Winona, MN 507-452-7231

    Midwest Metal Products offers quality heat treating services such as case and thru hardening, annealing, normalizing, tempering and blue coating. We also provide engineering services, grinding services and foundry services. Cost effective services and quality finished products. Call us today!

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  • Detroit, MI 800-632-8005

    Pioneer is a steel service center specializing in stainless, alloy and carbon steel. We also manufacture custom-shaped plate steel. In addition, we offer secondary operations such as heat treating, flame cutting, plasma cutting, and surface finishing. Pioneer provides prompt delivery and cost-effective steel products.

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  • Waterloo, IA 319-232-5221

    Established in 1981, Advanced Heat Treat Corp. (AHT) is a recognized global leader in providing heat treat services and metallurgical solutions. Between locations in Alabama, Iowa and Michigan, AHT offers over 20 surface treatments including trademarked processes UltraGlow® Ion Nitriding, UltraGlow® Induction Hardening, UltraOx®, and more. Quality certifications include ISO 9001:2015, Nadcap Heat Treating, IATF16949:2016, Federal Firearms License, ITAR registered, and more.

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  • South Lyon, MI 877-471-0840

    Sun Steel Treating has specialized in providing our customers precision and specialty Salt Bath Heat Treatments since 1958. Whether Nitriding and hardening alloys, carbon steels, tool steels or high speed specialty tools, our engineers know the metallurgical processes to apply to your steels. Not only the right heat and quench cycles and the precise temperatures, but all with minimal distortion.

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  • More Case Hardening Companies

businessIndustry Information

Case Hardening

Case hardening is a heat treatment that combines the ductility of low carbon materials with the strength of high carbon through the creation of a tough outer coating which surrounds a softer more malleable core. Unlike other coating and plating techniques, case hardening actually penetrates the surface of the base material providing a gradual transition from high carbon content to low.

Also known as surface hardening, case hardening can be applied in various applications. Industries such as construction, fencing, machining, grating and metalworking among others commonly utilize case hardened steel and iron components as they provide reliable parts and improve product longevity even under extreme stresses. Screws, grates, bolts, engine camshafts, firing pins, theft prevention systems, chains, metal panels and doors undergo this particular type of heat treating to resist cutting or shearing while remaining less brittle than untreated high carbon materials. Most often these parts are shaped before hardening as it reduces machining opportunities due to the heightened strength and rigidity. While carburization, or the diffusion of carbon into a metal, is the most commonly used type of case hardening, nitriding and boriding are also used and involve the use of nitrogen and boron diffusion respectively. With each technique high temperatures are used to diffuse the material, after which the surface layer is treated to attain the desired hardness.


Although the results of nitriding and boriding heat treatments may differ slightly from that of carburizing, the processes are quite similar. The steel or iron worked piece is placed inside what is known as a carburizing pack. Essentially this is an encasement tightly filled with carbon-based compounds. The part and its pack are then put inside a hot furnace and heated to very high temperatures, usually between 482 and 955 °C ( 900-1,750 °F) depending upon materials, thickness, desired hardness and corrosion resistance. The duration and temperature of this heating determines the depth to which the hardening extends beyond the surface of the substrate. Typical depths are around 1.5 mm at which point carbon content tapers down. While this is the traditional and perhaps most common technique used for case hardening, it is not the only one. Alternative methods abound and are even growing in popularity. One such technique is to heat the parts in a carbon-rich atmosphere, such as a methane-rich furnace. The carbon from the air will create the thin protective layer. Additionally, steel and iron components can be heated repeatedly with a torch and then quenched in a carbon rich medium, though this is most effective for smaller parts and is often capable of less penetration than furnace based methods. As homogeneous steels with low or high carbon content are now more readily available, case hardening is used less frequently, though these uniform metals cannot match the combination of extreme hardness and extreme toughness provided by case hardened parts and materials.