718H Pre-hardened plastic mold steel 
 Sweden wins one hundred 718,718 H Pre-hardened plastic mold steel 
 Main component of carbon% C: 0.33 Si Si: 0.3 of Mn Mn: 0.8 Cr: 1.8 Ni: 0.9 of Mo Mo: 0.2 
 Factory state: hardened and tempered to HRC33-37 
 Steel characteristics: (1) of this steel has been heat treated, uniform hardness through stabilization (HB330-370) 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 the local depth of about 5mm hardened to 50-55HRC. 
 (5) EDM is more suitable. 
 ASSAB 718H vacuum smelting of chrome - nickel - molybdenum alloy steel factory prior to deal with hardened and tempered, with the following bit: 
 □ no quenching crack and the risk of heat treatment distortion 
 □ without heat treatment costs 
 □ shorten the molding cycle 
 □ reduce the cost of mold production (for example, without distortion correction) 
 □ mold is easy to modify 
 □ subjected to nitriding and flame hardened to increase the surface hardness and wear resistance of the mold. 
 718H since production has been to maintain a high quality, low sulfur levels, the factory heat treatment pre-hardened to 36-40HRC steel can have the following characteristics: 
 □ excellent polishing and photo-etching properties 
 □ good processing performance 
 □ high purity and excellent homogeneity 
 □ better wear resistance and longer mold life 
 Note: 718H 100% by ultrasonic testing. 
 Large dimensions such as thickness of over 100mm pre-processing, the steel surface by the rough milling. About the convenience to provide users with: 
 □ save weight 
 □ has been removed off of the steel surface carbon layer (black) 
 □ standard size (positive tolerance) 
 □ reducing machining volume 
 Oxide layer in order to reduce the machining and tool wear of 
 Purposes: 
 □ large long-life plastic injection molds, such as home appliances, computer shell mold 
 □ high surface finish of plastic products mold 
 □ blow molding 
 □ high hardness, plastic mold of the slider can be used to 
 □ forming tools, compressed - braking mode (bending machine mode), (depending on production needs may be imposed by flame hardening or nitriding treatment) 
 □ structural parts and the shaft 
 Haikai metallurgical metal products Co., Ltd. Tel :021-67,768,089 Fax :021-67,768,199 QQ: 1,115,605,449