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  • 2020/10/09 Shunhao moulds factory
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    Shunhao moulds factory can make molds: 1. Melamine crockery moulds 2. Urea crockery moulds 3. Glossy melamine moulds 4. Matt finished melamine moulds ...

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Life of 718H melamine tableware Compress mold
Mar 22, 2020

Life of 718H melamine tableware Compress mold

718h mold steel has the same use as P20 mold steel, but because of better hardenability and superior performance, it can produce large-scale, high-grade plastic mold forming parts, which is an advanced plastic mold steel. 718h mold steel hardness can be understood from two aspects.

① Hardening treatment In order to improve the life of the mold to more than 800,000 mold times, it can pre-harden the mold steel. Hardening and low temperature tempering are used to achieve this. During quenching, it is preheated at 500-600 ℃ for 2-4 hours, and then kept at 850-880 ℃ for a certain period of time (at least 2 hours). It is cooled in oil to 50-100 ℃ and air-cooled. The hardness after quenching can reach 50 -52HRC, in order to prevent cracking, a low-temperature tempering treatment at 200 ° C should be immediately performed. After tempering, the hardness can be maintained above 48HRC.

Melamine Tablewaare Compress Mold

② Nitriding. Nitriding treatment can obtain a high hardness surface layer structure. The hardness of the surface layer after nitriding can reach 650-700HV (57-60HRC). The mold life can reach more than one million times. The nitrided layer has the characteristics of dense structure and smoothness. Improved anti-corrosive performance against humid air and lye.

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