GENERAL TECHNICAL INFORMATION CBN INSERTS KB50, TB650, KB90, KB90A PHYSICAL PROPERTIES Grade KB50 TB650 KB90 KB90A TRS (Gpa) 0,9 - 1,1 1,0 - 1,1 1,1 - 1,2 1,1 - 1,2 Hardness (Gpa) 29 - 31 30 - 32 39 - 42 35 - 38 KB50 • High wear resistant cubic boron nitride with low CBN content. • For precision machining of hardened steels (harder than 45HRC) such as hot and cold working■ tool steels, die steels, case hardened steels, carburized iron and high speed steel. • For continuous cut. • For turning TB650 • High wear resistant cubic boron nitride with low CBN content. • Designed for finishing to roughing applications on hardened steels (harder than 45HRC). • Can be applied to light interrupted cutting applications. • For turning / Pour tournage KB90 • Tough cubic boron nitride with high CBN content. • For high speed machining of cast iron. • Suitable for machining cemented tungsten carbide, sintered metal and heavy alloys. • Excellent for interrupted cutting of hardened steel.■ KB90A • Solid CBN with excellent impact resistance. • For high speed machining of cast iron. • Can be applied for rough to medium machining of hardened steel.■ 1164