Although the hardness of CrN is Hv1700~1900 less than TiN, but the friction is low, temperature of oxidation is high, the weariness and corrosion resistance are also excellent. The color is silver, and it is suitable for glass fiber and flame retardants injection. Because the corrosive gas will come out when those materials are heating and the gas will corrode screw. The CrN itself is high heat and corrosion resistance so it is the most suitable for this kind of injection.
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