1. This material (chemical name: 3Cr2Mo) is plastic mould steel, pre- Hardened to 30-34HRC, and easy machining, deformation; 2. EFER On ESR steel echibitws a high purity, is suited for spark erosion And mirror-like production; 3. There is uniform hardness over cross-section of large size; 4. Cab be hardened again to 40HRC; 5. Application: Injection, plastic blow-up and plastic extrusion mould.