Plastic mould steel 1.2311/AISI P20 Tech:EAF+LF+VD Pre-hardly to HB 280-310, Easy machining,deformation Plastic Mould Steel 1.2311/ AISI P20 Grade P20/1.2311/3Cr2Mo, Pre-hardly to HB 280-310 Chemical composition:(%) C:0.40 Cr:2.0 Mn:1.5 Mo:0.2 Si:0.3 1. This material (chemical name: 3Cr2Mo) is plastic mould steel, Pre-hardly to HB 280-310, and easy machining, deformation; suited for spark erosion and mirror-like production; 2.Excellent Polish ability with pre hardened delivery to save time after 100% inspection by ultrasonic machine to safeguard its quality. Application:Used in hot plastic injection or vacuum drawing moulds and press moulds main fittings for high load machine mould, contracture accessories, appearance design of TV, washing machine.