Hitachi HMD5 Specialty in Japan:
1. HMD5 has a simple external treatment process. After flame heating, it only needs air cooling to get enough hardness, and it is not easy to produce surface oxidation and decarburization. It is not limited by the site and equipment. The operator
Conveniently, it can shorten the mold manufacturing cycle, save energy and reduce the manufacturing cost.
2. The quenching temperature range of HMD5 is wide, ranging from 825℃ to 1100℃. After quenching, good results are obtained.
3. HMD5 has good hardenability, high hardening capacity and small thermal external deformation. After the die is completely processed and formed, it is applied to the cutting edge with oxygen -7 fast flame to the quenching temperature, and then air-cooled to achieve injection.
Purpose, without other processing, so the deformation is very small.
4. HMD5 has excellent toughness, and the cutting edge of the die is not easy to crack or collapse during use.
5. Flame quenching has hardness and various properties similar to overall quenching, high hardness and good wear resistance, and the hardness after air cooling can generally reach more than 60HRC. 6HMD5 has good weldability and convenient repair and welding. In case of manufacturing deviation, the corresponding covered electrode can be used for repair welding, and the ideal effect can be achieved by polishing and trimming.
Chemical composition of Hitachi HMD5 in Japan:
Japanese patent steel grade of Hitachi Metal, with undisclosed chemical composition.
Flame quenching process of Hitachi HMD5 in Japan;
Heating temperature: 825℃~1100℃, heating to bright red (950℃ target), and gradually moving the heating area. The following figure shows the flame quenching process essentials of Hitachi flame quenched steel HMD in Japan.
Cooling mode: air cooling.
Tempering process: Tempering at 150~200℃ can improve toughness, and the hardness after tempering is > 60HRC.
Hitachi HMD5 application in Japan:
It is widely used to manufacture cold-working dies such as cold stamping dies, cold blanking dies, deep-drawing dies, sheet punching dies, shaping dies, trimming dies, shearing dies, blanking dies, bending dies, etc. The practice in Dongguan Europe has proved that Hitachi HMD5 of Japan is especially suitable for large-scale insert dies and cold-working dies with high requirements for strength and toughness (such as cold extrusion dies and cold upsetting dies, etc.).
