The tool material , for faster machining , should have wear resistance , red hardness and thoughness

 The tool material, for faster machining, should have wear resistance, red hardness and toughness.The principal material used in cutting tool are as follows ;

1) High speed steel :- The high-speed steel containing 18% tungsten, 4% chromium and1% vanadium is considered to be one pf the best all-purpose tool steel, They retain their hardness upto a temperature of 900-degree centigrade .

2)High carbon steel :- The tool made up of high carbon steel have low heat and wear resistance. Since these tools lose hardness at about 300-degree centigrade , therefore they are not suitable for hight cutting speed and heavy -duty work. Such tools may be used  on soft material such as wood.

3)Carbide :- A carbide suitable for steel machining consists of  82% tungsten carbide, 10% titanium carbide and 8% cobalt . The carbide tools operating at very low cutting speeds (below 30 m/min) reduces tool life.

4)Ceramic:- The ceramic tools are fixed to a tool  body by brazing . These tool have greater tool life than carbide tools.