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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.

  • Sacramento, CA 916-925-6100

    Vacuum Processing Engineering, Inc. is best known for several types of Precision Brazing, Diffusion Bonding, Thin Film Coating, Heat Treating and Production of Precision Assemblies. Since its founding in 1976, VPE has established a track record of excellence as both an innovator and as a reliable ISO 9001:2008 certified volume producer of mission-critical assemblies for demanding customers.

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  • Williamston, MI 517-655-4402

    Modern Metal Processing has nearly 30 years of experience, and that shows in the quality of heat treating processes practiced. Our in-house aluminum fabricating abilities allow us to keep the cost of our heat exchangers low, as well as giving us the flexibility to develop unique solutions and new products. Look no further for custom heat exchangers, brazing, and heat treating services.

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  • Londonderry, NH 888-669-3539

    From prototypes to large production runs, MuShield provides unsurpassed quality and service. For example, with every magnetic shield MuShield manufactures, the Company's goal is to attain the maximum shielding capacity for that part while maintaining its structural integrity. MuShield meets these objectives by heat treating parts and material on-site.

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  • Meadville, PA 814-333-1782

    We do vacuum heat treating such as hardening, straighten parts & minimize distortions. We specialize in vacuum heat treating technology & offer a wide range of heat treating choices. At Peters’ Heat Treating, our main concern is on precision parts & has been for over 100 years of combined experience. Some services we offer: vacuum hardening/annealing, vacuum aging, & induction hardening/annealing.

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  • Hayward, CA 510-782-7755

    ThermoFusion has been offering superior heat treating services for more than three decades. A full-service ISO9001-2000 facility, our goal is to work hard, have fun and exceed our customers’ needs and expectations. We have worldwide experience and training and are constantly involved in large, small and development projects. Call or visit our website today, we would love to serve you!

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  • Winchester, KY 859-744-9551

    All of our value-added heat treating is designed to satisfy a number of applications. Our batch hardening furnaces can reach temperatures from 1400 to 2400 °F. We are a turnkey manufacturer which means you will receive your products in a short amount of time. There are numerous benefits to our heat treating services. Please visit our website for more information!

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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.