P21 mold steel 
 Details: 
 Used mirror-polished mold, TV gels, cosmetic boxes, such as mold, precision mold processing wrinkles, office automation equipment, automotive parts EDM mold. 
 Factory status: Pre-hardened to HB370-400 
 Chemical composition (%): 
 C: 0.15 SI: 0.30 MN: moderate NI: 3.0 AL: 1.0 CU: 1.0 MO: 0.3 S: moderate 
 Features: 
 * No heat treatment 
 * To be cutting very good 
 * Availability of excellent and satisfactory gloss mirror finish 
 * Increased die life 
 * For high-precision mold 
 * Uniform section hardness 
 * Etching process of the superior 
 * Excellent weldability 
 * EDM after grinding easy 
 * Use is not deformed 
 Physical properties: 
 Coefficient of thermal expansion 10-6 m / (mxk) 
 20-100 ℃ 11.3 
 20-200 ℃ 12.5 
 20-300 ℃ 13.4 
 Mechanical Properties: 
 Hardness HRC 41HRC 
 Yield strength kgf / m ㎡ 103 (0.2%) 
 Tensile strength kgf / mm2 128 
 Elongation% 15.6 
 Cross-section reduction rate 39.8% 
 Longitudinal impact value Kgf.m / C ㎡ 1.8-3 
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