The SK2 carbon tool steel 

 Chemical Composition (wt%): 
 Carbon C: 1.10 ~ 1.30 
 Silicon Si: ≤ 0.35 
 Mn Mn: ≤ 0.50 
 Sulfur S: ≤ 0.030 
 Phosphorus P: ≤ 0.030 
 Chromium Cr: ≤ 0.20 
 Ni - Ni: ≤ 0.25 
 Copper Cu: ≤ 0.30) 
 Features: 
 Has high strength, wear resistance and sufficient toughness and durability, machinability, quenching without deformation less, tempering stability. 
 Scope: the shape of a simple, small tool and die. 
 Quenching specifications: quenching temperature of 750 ~ 7800C, quenching, tempering hardness 63HRC.