Mr. Hu said that for reinforced plastic molds made of nylon and 30% glass fiber, using 718 quenched and hardened die steel now often results in burrs. Nowadays, every product has to be deburred, which is quite troublesome.
The reinforced plastic made of nylon and 30% glass fiber cannot be quenched with 718, which is a low-carbon steel with a low alloy content of 3Cr2MoNi. Due to its low carbon content, even if you quench and harden it, its wear resistance cannot be improved.
Because the carbon (C) content determines the hardenability of die steel, the higher the carbon content, the higher the total alloy content, the higher the hardness, and the better the wear resistance. It is not true that if the hardness is increased, the wear resistance will be good. This condition cannot be reversed.
The reinforced plastic made of nylon and 30% glass fiber can severely erode molds. The mold steel must be non-stick and of high hardness, otherwise the mold will be quickly worn away, resulting in burrs on the product. 718 is an alloy structural steel, which does not have high wear resistance. Don’t indulge in unrealistic dreams.
For reinforced plastic molds made of nylon and 30% glass fiber, I recommend using 8503 die steel, which is non-stick to materials.
8503 is a non-stick mold steel with a proprietary alloy ratio developed by Wu Dejian. It has a hardness of 55-61HRC and an anti-chipping performance twice that of DC53. However, compared to DC53, its performance is doubled without doubling the price, and it also offers the benefit of non-stick material. Especially, this non-stick characteristic, coupled with its high hardness, is a fundamental and effective solution to the problem of molds with high glass fiber content, which are prone to being eroded, leading to product burrs and mold galling.
Mr. Yu from Ningbo said: “Using 8503 die steel for molds with glass fiber is quite nice. It can withstand continuous pressing without any burrs!”!
#die Steel King Wu Dejian
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