Tool Steel (Tool Steel (51-100)), is used to manufacture cutting tools, measuring tools, dies and wear-resistant tool steel. Tool steel with high hardness and high temperature can maintain high hardness and red hardness, and high wear resistance and appropriate toughness. Tool steel is generally divided into carbon tool steel, alloy tool steel and high speed tool steel.
Carbon tool steel carbon mass fraction is higher, at 0.65-1.35%, and their organizations are hypoeutectoid, or eutectoid eutectoid steel. Carbon tool steel heat treated to receive a higher surface hardness and wear resistance, the center has good toughness; annealed low hardness (less than HB207), good processing properties. But its red hardness difference, when the working temperature up to 250 ℃, the hardness and wear resistance of a sharp decline, down to HRC60 hardness below the hardenability of these steels is low. Larger tools can not hardenability (water quenching diameter of 15mm), water quenched when the center of the surface hardened layer with hardness vary greatly. Makes the tool easy to produce deformation during quenching. Or the formation of cracks addition, the quenching temperature range is narrow, the quenching temperature should be strictly controlled. Prevent overheating, decarburization and deformation.
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