718 Sweden plastic mold steel 
 Main Ingredients: C: 0.33? SI: 0.30? MN: 0.80?? CR: 1.80?? Ni: 0.90??? Mo: 0.20?? S: 0.008 
 Factory state: DELIVERED CONDITION 290-330HB hardness by hardening and tempering 
 Steel properties: (1) of this steel has been heat treated, uniform hardness through stabilization (HB290-330) made the mold never deformed 
 (2) In addition to the smaller fancy, and more have been excluded surface oxide black, it is high utilization of materials, and can reduce processing costs. 
 (3) of the ultrasound examinations, hardness and microstructure of uniform structure, and easy to reach the mirror polished. 
 (4) free flame in the air hardening, so that part of the vulnerability of local hard-to 50-55HRC about 5MM depth 
 (5) due to sulfur content of the end, the EDM is more suitable.