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N690 ISOEXTRA(Bohler-Uddeholm) - Bohler-Uddeholm steel, recommended working hardness 58-60HRC. Similar to VG-10. Later, Aichi produced pretty much identical(with N690),
ZA-18 steel, promoted to be better a performer than VG-10. ISOEXTRA signifies ESR technology used in making of this steel.
Manufacturing Technology - ESR
Country - Sweden(SE)
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