NAK80 is pre-hardened plastic mold steel. Have a good polishing performance and carving of the discharge process of good 

 NAK80 factory hardness: hard to pre-36 ~ 45HRC 

 NAK80 Features: without heat treatment, excellent optical rotation throw, cutting, etching resistance 

 ● pure steel vacuum degassing refining process. 

 ● ball annealing softening process, cutting performance is good. 

 ● strengthening the elements vanadium, molybdenum special added, extremely excellent wear resistance. 

 NAK80 use 
 Use the mirror-polished mold, dust, TV gels, cosmetic boxes, precision mold processing wrinkles, office automation equipment, automotive parts EDM mold. Transparent finish of the product or product requirements, such as home, car, camera, computer products and other supplies on the transparent mold. 

 ● 2MM thickness of not more than a thin sheet, efficient blanking die, punch die and pressure die set. [1] 

 ● a variety of scissors, mounted blade, woodworking blade. 

 ● thread rolling die and wear-resistant slider. 

 ● cold heading dies, thermosetting resin molding. 

 ● deep drawing forming, cold extrusion dies 



 Physical properties 
 NAK80 steel features: without heat treatment, excellent optical rotation throw, cutting, etching resistance. Solution treatment will die or the workpiece temperature to 600 ℃ preheating, and then heated to 840-900 ℃ holding a certain time (at least 2 hours), then cooled to room temperature, solid solution after the hardness 29-32HRC. 

 According to customer needs, can also provide easy cutting of the solid solution state of steel (29-32HRC), followed by aging treatment finishing mold hardness of up to 37-43HRC, saving machining costs and time. 

 NAK80 chemical composition 


 Element C Si Ni Mn Mo Cu AI 
 Content 0.12 0.35 3.20 1.80 0.2-0.50 1.0 1.0 [2] 

 NAK80 mechanical properties 
 NAK80 mechanical properties: 

 1, the mechanical properties at room temperature (20 ℃) 



 Hardness 41HRC 
 0.2% yield strength 103kgf / sq mm (147Ksi) 
 Tensile strength 128kgf / sq mm (147Ksi) 
 Cross-section reduction rate of 38.0% 
 Elongation 15.6% 
 Impact value (U-notch, 20 ℃) ??2.0Kgf-m / ??sq cm (151bf-ft) vertical 

 2, high temperature mechanical properties 



 Mechanical Testing temperature (℃ 
 100 200 300 
 Tensile strength (Ksi) - 145 143 
 Cross-section reduction rate (%) - 38.5 40.1 
 Elongation - 15.9 16.0 
 Shock Value 1.8 3.6 3.5 
 Hardness (HV) 395 375 360 

 NAK80 processing methods 
 NAK80 machining 

 Cutting Tools 

 NAK80 high hardness, cutting resistance than other steels play, it is recommended to use high-speed steel-M2 (SKH9) or super-hard alloy-P40 tool. Drilling 

 When drilling, the hole diameter greater the cutting speed to be smaller. If smaller than the standard spiral groove, short length, will reduce the risk of tool breakage. 

 Milling 

 Feed to 0.06m / l standard, if the feed rate is too large, will reduce tool life. 

 Planer processing 

 Recommended for super-hard alloy planer, planer for the super-hard alloy, make the tool angle of about 8 ℃, front clearance angle below 10 ℃, so get a better result; NAK80 precipitation hardening for the pre-hardened steel, the hardness of 40HRC so, without further heat treatment can be used directly. 

 Solution treatment 

 The purpose of the uniform alloy composition in the austenite solid solution. Not hardened due, so do not need fast cooling rate, so there is no significant residual stress. 

 Precipitation hardening 

 Temperature and maintain a considerable time, nickel, aluminum, copper and other metal compounds between precipitation, the material hardening. Because they do not have to rely on hardened, it does not matter the quality of the general effect of steel material issue, even thicker steel material also may be very uniform hardness distribution of cross-section. 

 Welding performance 

 Weld and heat affected zone will not harden, hardness slightly lower than the base metal (already precipitation hardened), but the welding and then giving 500 ℃ * 5 hours of precipitation hardening treatment can restore hardness. 

 Grinding of 

 NAK80 easy to achieve than other steel mirror requirements, because the following two points: 

 1) the double melting refining leaving the pinhole to a minimum. 

 2) because the precipitation hardening low-carbon steel, and has a fine and uniform microstructure. Prior to the grinding and polishing, the surface must first reach the required flatness, straightness, and the right shape and size and so on. 

 a) use the full range of abrasive material must be thick to thin, depending on the requirement to use, can not skip a grade grinding. 

 b) grinding and polishing each of the previous direction should be perpendicular to the traces. 

 c) unless the ground before a complete removal of the traces and bright, not to use the next level of sandpaper, or pinholes may be polished later. 

 d) The use of the abrasive particles should be uniform. 

 e) Use of particle size than the abrasive to remove a small pinhole pinhole. 

 f) use more parts of the grinding or polishing tool of soft. 

 g) If the whetstone should be used in relatively soft, and the first made with the ground surface to match the shape of the shape. 

 h) If the work suspension, and semi-finished piece must be placed for some time, its surface must be clean and stored in a dry place 

 i) Polishing time: 

 (1) The purpose of polishing the surface with a bright and shiny and not pinhole or removal of the surface polished. 

 (2) polishing should be quick and light, the surface roughness before polishing that must be minimized. 

 j) pinhole mirror handling and other problems, usually due to an incorrect result of grinding and polishing process, should pay more attention. Grinding and polishing conditions NAK80