The superiority of Halnn solid CBN inserts, (1) Excellent anti - fracture performance (2) Good wear resistance (3) Excellent chemical stability (4) Higher cutting efficiency (5) Longer cutter lifetime (6) Indexable cubic boron nitride sintered body - with more cutting edges Depending on the rolls materials which are corresponding with the cutting tools grade used for turning rolls, it can be divided 3 sorts, 1. Turning the low-hardness rolls Ductile Cast Iron rolls, High alloy cast iron rolls usually used for heat-rolls ,support-rolls, intermediate-rolls, the feature is that hardness is lower comparing to working-rolls .It can turning common alloy cutting tools and the common cutting tools grade is YG6 or YG6X. 2. Turning high hardness cast iron rolls When turning chilled cast iron rolls, High Ni-Cr rolls, high chromium rolls, high speed steel rolls, semi-steel rolls, Ni-Cr-Mo centrifugal composite rolls，Rolls Blank usually have Porosity, trachoma, sand bag defects because of the rolls high hardness. So the tools need well impact resistance, heat resistance and wear resistance. In the past, this type rolls usually use ceramic cutters, the cutting tools will easily chip. In current times, People usually use BN-K1 solid cbn inserts machining this rolls.BN-K1 solid cbn inserts not only insist the excellent property of high hardness and well impact resistance, but also have well impact roughness, can’t easily chip, and can rough machining rolls.BN-K1 solid cbn insert has the best impact resistance, which obey large cutting depth, high metal cutting ratio, the common cutting parameters as follows, For BN-K1 solid cbn inserts machining HSD82 hardness high Ni-Cr cast iron rolls: The cutting depth each side can arrive 12mm; Feed Rate is 1.5mm/r. 3. Turning high hardness forged steel cold roll For example, turning GCr15 Rolling bearing steel roll, Cr3, Cr5 roller, 86CrMoV7, 9Cr2Mo rolls. This type roll rough is forge workpiece, usually use as cold roll after heat-treatment, the common inserts grade is BN-S20 solid cbn inserts which are the research result of National key scientific project, it is made of non-metal adhesives and CBN refined powder, and it not only follow BN-K1 toughness, but also is especially researched for long iron material forged steel cold roll. When machining forged steel cold rolls, BN-S20 solid cbn insert Wear-resistance will be about 3 times of common CBN inserts.