During steel production, increased local hardening may occasionally occur on the surfaces of semi-finished products.
In the further processing and later use of the finished products, this hardening (also called hard spots) can cause problems or lead to component failure. Because of this, relevant specifications increasingly call for surface hardness testing. Testing was previously only possible using „destructive“ methods (Vickers, Brinell, Rockwell) on samples or, non-destructively, using the Leeb rebound hardness test.
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