SKD11 
 Features: 
 1. Long life and high wear resistance, high toughness and impact resistance. Heat treatment is not easy deformation 
 Subtle organizational structure 
 Sample uses: 
 Purposes hardness purposes hardness 
 Die to HRC58 ~ 62 high-level amount of regulation to HRC60 ~ 65 
 Forming roll to HRC58 ~ 63 rubbing silk roll to HRC60 ~ 63 
 Phillips head screws forming mold HRC57 ~ 62 cold extrusion molding presses using a male mold to HRC58 ~ 65 
 Tensile modulus HRC58 ~ 62 to HRC58 ~ 63 cold heading die 
 Scissors HRC 50 ~ 65 thermosetting resin molding using mold HRC56 ~ 61 
 Chemical composition 
 C Si Mn P S of Cu of Ni Cr Mo V 
 1.4 ~ 1.6 ≦ 0.4 ≦ 0.6 ≦ 0.03 ≦ 0.03 ≦ 0.25 ≦ 0.5 11 13 0.8 ~ 1.2 0.2 ~ 0.5 
 Heat treatment conditions: 
 Forging (° C) heat treatment (° C) hardness transition point (℃) 
 Anneal hardening (Note) tempering annealing (HB) quenching (HRC) Tempering (HRC) Ac of Ar 
 1100 900 830 880 slow cooling from 1000 to 1050 150 250 air-cooled air-cooled ≦ 255 - ≧ 58 815 875 765 705 
 1020 to 1050 air-cooled from 500 to 530 air-cooled 
 Quality / safety certification ︰ material quality guarantee, to ensure quality 
 Factory state ︰ HB255