Patent ID: 6375762
Filing Date: 2002-04-23
Classification: B23D,C23C

Abstract:
Base material for producing blank blades for circular saws, cutoff disks, gang saws as well as cutting and scraping devices, comprising a plate with two broad surfaces, two short edge sides and two long edge sides and consisting of a thermochemically carbon-enriched base steel plate having a base carbon content of less than 0.3 wt % carbon, said base steel plate having at least one boundary area enriched with 0.5-1.1 wt % carbon starting from at least one of said broad surfaces, characterized in that:said boundary area being enriched with carbon transitions with a decreasing mean carbon gradient of 0.25-0.75 wt % C/mm into an area not enriched with carbon; the base steel plate being hardened and tempered so that said boundary area enriched with carbon has a hardness of 50-63 HRC and transforms with a decreasing mean hardness gradient of 10-22 HRC/mm into said area not enriched with carbon, having a hardness of 20-40 HRC; and said edge sides of said base steel plate have a sandwich structure formed of said carbon-enriched boundary area and said area not enriched with carbon.