Elotest HST Heavy Plate Hard Spot Tester
During steel production occasionally local hardening may occur on the surfaces of semi-finished products (e.g. heavy plates). In the further processing and later use of the finished products (e.g. longitudinal seam-welded tubes), this hardening (also called as "hard spots") can cause problems or lead to component failure. Thus relevant specifications increasingly require an in-process hardness testing of surfaces. In the past hardness measurements had been performed only on a sample basis, commonly using "destructive" methods combined with lab analysis. Due to the increasing call for an extensive surface testing of semi-finished products, Rohmann GmbH developed a new test method (EDDY+), which had been applied for a patent.