eutektoidse koostise (C-sisaldus 0,8 %) ja alla 727 oC täielikult eutektoidstruktuuriga teras (vt eutektoid, perliit), steel having the same composition as the eutectoid point in the iron-carbon system (0.87 % C), and which therefore consists entirely of the eutectoid at temperatures below 727 oC (see: eutectoid, pearlite)