Pre-hardened Mold Steels Remain Stable During Machining

Nak55 and Nak80 pre-hardened plastic mold steels from International Mold Steel are engineered to remain extremely stable during heavy machining.

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Nak55 and Nak80 pre-hardened plastic mold steels from International Mold Steel are engineered to remain extremely stable during heavy machining. Although they offer hardness of 38 and 42 HRc, respectively, the steel grades are said to be easy to machine and are void of hard spots. Both offer high polishability, with Nak80 capable of achieving an SPI #1 finish, and the hardened white layer associated with EDMing can be easily removed with both grades, the company says. No stoning is required.

Nak55 and Nak80 also are said to be highly “weld-able” steels in which the heat-affected zone surrounding the welds gets softer, not harder like most quench and tempered steels. Post-heating at 950°F will bring the heat-affected zone back to the base material hardness, making weld detection nearly impossible to find on the finished part, International Mold Steel says.