1 , high-carbon steel : Cutters are made ​​of a high carbon steel carbon content of 0.8% to 1.5% between hardened after use , because the cutting friction four very easy temper softening , being replaced by other high-speed steel cutting tools . Generally only suitable for the cutting of soft metal materials commonly used in there SK1, SK2, SK7 so on. 2 , high-speed steel : HSS is a common name white turning base alloy steel , carbon content of 0.7 to 0.85 % of the carbon added to W, Cr, V , and alloying elements such as Co made ​​. High-speed steel material containing e.g. 18-4-4 18% tungsten, chromium, and 4% 4% vanadium high speed steel. High-speed steel tool cutting frictional heat generated up to 6000C, and less suitable for turning screw speed 1000rpm , the commonly used high-speed steel tool such as SKH2, SKH4A, SKH5, SKH6, SKH9 so on. 3 , non- iron alloy tool : This is an alloy of cobalt, chromium and tungsten , because cutting is difficult to cast molding manufacturing , so called super-hard cast alloy , the most representative of stellite, its tool toughness and excellent wear resistance , the temperature at 8200C its hardness remains unaffected , far beyond the level of high-speed steel heat , suitable for high speed and the cutting deeper work . 4 , sintered carbide tool: Carbide tool is a powder metallurgy product, the main component of the tungsten carbide is 50 % ~ 90% of tungsten , and the added titanium , molybdenum, tantalum, cobalt powder as a binder , and then heating to complete the sintering . Triple high hardness carbide cutting tools than any other material , the most hard high carbon steel , suitable for cutting hard metal or stone, its brittle material , it can only be made ​​from a sheet, and then welded to the more ductile on the handle so that the blade passivation or cracked , you can replace another knife or replacement blade , which is called Disposable enough turning lathe . Carbide cutting tool in accordance with international standards (ISO) cutting their different nature , into P, M, K categories , respectively, in blue , yellow and red colors to identify : P class suitable for cutting steel, there are P01, P10, P20, P30, P40, P50 six , P01 for the high-speed precision lathe , the number of small , high abrasion resistance , P50 for the low speed rough turning, large numbers, high toughness , painted blue to identify the holder . K classes suitable for cutting stone, iron and other brittle materials , there is K01, K10, K20, K30, K40 five , K01 high-speed precision lathe , K40 is low Roughing tool , such holder painted in red to identify . M class between P and M class between classes , suitable for cutting larger materials such as ductile not ? Unlined garment ? Etc. , painted in yellow to handle such identification . 5 , Ceramic Tool : Cutters are made ​​of alumina ceramic powder, add a small amount of the element , and then through the high-temperature sintering made ​​its hardness, heat resistance , high cutting speeds than tungsten carbide , but because crisp, it does not apply to non-continuous or re- turning , only suitable for high-speed precision cutting . 6 , diamond tool When used for advanced surface processing, using a circular blade edge or surface for light industrial diamonds system . Get a more smooth surface , mainly used for precision turning light alloy or copper alloy , you must use high speed, while turning the minimum required in 60 ~ 100m/min, usually 200 ~ 300m/min. 7 , the boron oxide Cubic boron oxide (CBN) in recent years to promote the material , the hardness and wear resistance after the diamond cutting tool suitable for machining the hard, wear-resistant nickel-base alloys and iron family alloy, a cobalt-based alloy .