Sa Site 2311 plastic mold steel 
 (Corresponding standard AISIP20) 
 Conventional smelting (Conventional melting, and EF + LF + VD) 
 Key Features 
 - Has excellent hardening heat treatment performance 
 - Good polishing performance 
 - Can be subjected to nitriding 
 - Suitable for surface treatment (such as chrome-plated) 
 - Uniform material hardness (up to 400mm thick) 
 - Good toughness 
 - Good machining properties 
 The main application 
 - Plastic mold, mold base 
 - Die-casting mold 

 Chemical Composition% 
 C Si Mn P S Cr of Mo 
 0.37-0.42 ≤ 0.40 1.40-1.60 ≤ 0.025 ≤ 0.005 1.80-2.10 0.15-0.25 
 Physical properties 
 Coefficient of thermal expansion 20-100 ℃ Celsius 
 [10 -6 m / (m × K)] 20-200 ℃ Celsius 
 [10 -6 m / (m × K)] 20-300 ℃ Celsius 
 [10 -6 m / (m × K)] 20-400 ℃ Celsius 
 [10 -6 m / (m × K)] 20-500 ℃ Celsius 
 [10 -6 m / (m × K)] 
 11.1 12.9 13.4 13.8 14.2 
 Thermal conductivity of 20 ℃ Celsius 
 [W / (m × K)] 350 ℃ Celsius 
 [W / (m × K)] 700 ℃ Celsius 
 [W / (m × K)] 
 35.7 33.4 32.0 
 Ultrasonic testing 
 The ASTM A388-FBH max.6mm (1/4 inch) or SEP1921-test group3-class Cc, or according to customer requirements 
 Purity degree 
 The ASTM the E45-Method A, with the type A ≤ 1.5, 
 B; C and D each ≤ 20 ≤ 2 or DIN 50 602-K4, or according to customer requirements 
 Factory state 
 Quenched and pre-hardened to 280 325 HB (950-1100 N / mm 2) 
 By state 
 280-325HB 
 Structural steel 
 Martensite and bainite