NAK55 die steel is a high polish of plastic mold steel 

 NAK55 mold hardness of steel factory 
 About pre-hardened 40HRC 

 NAK55 characteristics of die steel 

 Precipitation hardening, good workability, easy-to-repair welding, able to maintain long-term use of high accuracy; even hardness, high resistance and excellent finish polishing, the surface bite is easy to spend. ● No Heat Treatment ● ● by cutting a very good availability of excellent and satisfactory gloss mirror finish 

 ● ● increase tool life for high-precision cross-section of the hardness of the mold evenly ● ● ● etching process of the excellent weldability superior ● EDM grinding process after use is not easily deformed ● 

 NAK55 purpose tool steel 
 Products for the production of transparent plastic mold, requiring a good surface finish of the electric corrosion mold, or long-term production of high precision mold hardness. 

 NAK55 welding requiring special attention 
 NAK55 welding requiring special attention if the use of pre-heating or heating gas heater, the entire piece should also be heated to avoid rupture. As a result of welding or the use or the simultaneous rupture of the repair to be given when the solder is often more, in this case even a slight change will make the size, also immediately after the welding stress relief (at 870 ℃), and given hardening treatment temperature of 500 to 520 ℃. 

 Chemical composition 
 C C: 0.15 SI Silicon: 0.30 MN Manganese: moderate NI Nickel: 3.0 

 AL Aluminium: 1.0 CU Copper: 1.0 MO Mo: 0.3 S Sulfur: moderate 

 Mechanical Properties 
 HRC 41HRC hardness yield strength kgf / m ㎡ 103 (0.2%) Tensile strength kgf / mm2 128 Elongation% 15.6 39.8% shrinkage longitudinal section the impact of value Kgf. m / C m 1.8-3