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GPM60(Geruk) - Extremely high alloy, high speed tool steel. Capable of very high red hot hardness, up to 68-70HRC. Highly wear resistant steel. Rather difficult to sharpen, especially at 68HRC and above, but holds the edge really well. As with the other high carbide alloys, not recommended to used edges below 15 degree per side, or 30 inclusive. Lower than that can't support all the carbides and edge holding ability decreases. Japanese company KIYA produces kitchen knives using Hitachi HAP72 steel, which is Hitachi's version of the alloy, with 68-69HRC blades.
Manufacturing Technology - PM
Country - Germany(DE)
- Proprietary Equivalents
- Akers - Supra6
- Assab - Assab PM 60 Superclean
- Assab - ASP60
- Bohler-Uddeholm - Vanadis 60
- Carpenter - HS-60
- Daido - DAP580
- Daido - DEX80
- Dorrenberg - PMD60
- Erasteel - ASP2060
- Erasteel - ASP2078
- Hitachi - HAP72
- Kobelco Steel - KHA60
- Mitsubishi Steel - MAC-E
- Nachi Fujikoshi - FAX60
- Nachi Fujikoshi - FAXG1
- Rovalma - CSW41
- Rovalma - CSW-41
- Sanyo - SPM60
- Scana - PM60
- Scana - Stellapur PM60
- Villares Metals - Sinter60
NOTE - Approximate composition based on manufacturer's or standard reference information and other alloys in the same reference group is shown.
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