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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.

  • Warren, MI 586-264-8100

    Vac-Met, Incorporated offers hydrogen atmosphere processing using state-of-the-art equipment up to 84" in diameter by 120" deep. Vac Met, Inc. is a high-tech processing company specializing in heat treating utilizing the modern machinery capable of proving your business the superior solutions you need to stay ahead of the curve. Please call Vac-Met today for quality and affordable services.

  • Newington, CT 860-523-9090

    We are a commercial facility which processes metal parts to improve their hardness, strength, ductility or formability. We serve commercial, military and aerospace markets. We are an approved source for numerous companies and are approved by NADCAP for heat treating. We are ISO 9001:2000 Registered and AS 9100 Registered. We also process steel parts to provide a deep black oxide surface finish.

  • Fraser, MI 586-293-5355

    Heat treating services for aerospace, auto, truck, tool and die applications. At our facility we have the distinction of being the only US heat treat facility to carburize Class “A” flight-critical and flight-safety mechanisms for Bell Helicopter. Our certifications: ISO 9002, NADCAP, Q1, QS9000.

  • Pittsburgh, PA 412-781-8053

    Offering industrial and commercial heat treating for over 60 years, Pittsburgh Metal Processing specializes in heat treating, both ferrous and nonferrous alloys. We offer annealing, tempering, stress relieving, normalizing, hardening and quenching. Expect short lead times and a quick turnaround!

  • St. Louis, MO 314-647-7500

    Our commercial metal heat treating services include brazing, vacuum tempering, vacuum heat treating, induction heat treating, batch heat treating and more. At PAULO, we are able to do metallurgical testing and offer analysis services, which is why we are a leader in the metal heat treating industry.

  • Fort Wayne, IN 260-426-8700

    We at Ward Corp pride ourselves as being a large enough business to support the tooling, casting, heat treating, and machining requirements of our customers, yet small enough to be responsive and pro-active to assure ongoing customer satisfaction. Located in Fort Wayne, Indiana, this family owned business has successfully grown from 3 employees to over 200 employees throughout its four divisions.

  • 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.