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Metal bonding has nothing to do with cement or concrete for construction. It is a thermal process for hardening.

What is case-hardening?

Cementing steel is a thermochemical process that is carried out to harden the surface of parts without modifying their internal structure so that they continue to have the same properties.

How is cementing done?

This process is achieved by adding a special carbon-enriched product to its surface and placing the part in an oven at about 900 degrees Celsius for hours, depending on the depth of cementing that we need. Thus, the cementitious agent combines with steel, providing more carbon only in the most superficial part.

Subsequently, a tempering process is carried out. Since the steel part has 2 zones with different percentages of carbon, a different hardening will occur.

Better steels for the process

The less carbon concentration the steel has, the more appropriate it is, since if the steel itself has a lot of carbon, its concentration on the surface cannot be changed much.

Steels with a good amount of chromium help the process to be faster, and those with more than 5% nickel do the opposite effect, make the process slower.


With this process we get parts with a very high external hardness, but with a less brittle core to a blow than with a tempered steel with high carbon content.

We can find it in the market in discs for saws, where the outer part that works more and suffers more friction has been cemented, thus preventing the rest of the disc from being more prone to breaking.

Another example that we can find is in cutting tools, which are cemented on the outside to give consistency in the cut and prevent breakage thanks to a core that better absorbs shocks.

I hope I have clarified your doubts about cementing. You can follow us on Facebook or subscribe to our emails with offers or promotions that you find interesting.