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Simple yet very efficient blade steel. Very popular with knifemakers. Sort of de-facto default carbon steel. Rusts easy though. Mostly you'll encounter it in 58-60HRC range. Several makers take it all thee way up to 64-65HRC. Sandvik makes very pure equivalent of this steel under Sandvik 20C Shock Absorber name.
Alternate designations: 1095(AISI), G10950(UNS), 1.1274(W-Nr), SUP4(JIS), 1870(SIS), 060A96(BS), 44B(BS), Ck101(DIN), XC100(AFNOR), C100(UNI).