In plain-carbon steel, austenite exists above the critical eutectoid temperature of 1000 K (727 °C); other alloys of steel have different eutectoid temperatures.
No plano aceiro-carbono, a austenita existe por riba da temperatura crítica eutectoide de 1000 K (727 °C); outras ligas de aceiro posúen temperaturas eutectoides diferentes.