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Tool SteelCarbon tool steel contains 0.7% of carbon and more. When entirely finished, this material is known for its hardness and strength. It is used in manufacturing tools. The carbon tool steel is valued for its low cost and relative hardness as opposed to the other tool materials. Depending on its chemical properties there exist carbon; alloy and high-speed steel.Carbon tool steel is used to manufacture jointer’s and bench tools operated under easy cutting conditions. It comes in handy in welding structures on the tools operated under the conditions that do not cause heating of the cutting edge. The main drawback of this steel is insufficient heat resistance. Alloy tool steel is used to make cutting tools (drills, milling cutters, tap-screws, tapping dies), and die tools which are more important. The letters and figures used in indicating the brand mean the following: figure -average carbon content in tenths of percent, X – chromium alloy, V – tungsten alloy, G – manganese alloy. The content of chromium, tungsten and manganese in such steel is set by GOST (state standard). High-speed steel is again for the most part used to make cutting tools. This kind of steel has high thermal resistance, is hard and durable. Besides, high-speed steel has increased resistance to plastic deformation. A cutting tool is operated under the conditions of extended contact and friction with the metal being treated. The configurations and properties of the cutting edge should remain unchanged in the process of operation. The material used in manufacturing cutting tools should be hard and durable – that is cable of retaining the cutting properties of the edge under friction.A reliable tool is first of all the high-quality material used by its manufacturer working in the field of commercial tool steel rolling.