Share this page on

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.

Related Categories

Our case hardening services are second to none. We are an accomplished company that can provide you with sound products. We aim to please and you will not be upset with the items you receive. We are your source for case hardening. You can count on us to handle any of your requests. Just let us know your application and we can handle the rest. We look forward to hearing from you!
Read Reviews
If you have been searching for a company that will provide you with case hardening services then you have come to the place. We offer superb products at a very reasonable price. These hassle-free products are far superior compared to our competition. We are devoted to all of your needs. The attributes of our case hardening is unmatched. You will not find a better quality anywhere else. Give us a call today!
Read Reviews
Are you in need of case hardening? The attributes of our hardening services are beyond compare. These world-class services will dramatically improve the durability of your products. Our solutions can handle the rigors of normal wear and there is no task too demanding. Just let us know your applications and we can handle the rest. Give us a call today to learn more information!
Read Reviews
We are eager to provide you with case hardening services. Our teams will accurately heat treat all of your items. Unlike other heat treat facilities, our normal delivery includes drop shipment of products to customers' requested final destination. We offer the procedures and case hardening you can count on. Turn to Queen City Steel Treating for the best case hardening around!
Read Reviews
We perform our case hardening in endothermic atmosphere or vacuum conditions. Our common through hardened material is 4140 and 420SS. We promise that our processes result in products having surfaces that are harder than their cores. Turn to us for compromising quality on all of our items. We have raised the standard in our industry. Give us a call today to learn more about our case hardening.
Read Reviews
More Case Hardening Companies More Case Hardening Companies
Industry 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.
Move to Top