Official Answer
Answer
Karfe na Carbon kamar SAE 1070 suna jurewa ductile-to-brittle miƙa mulki (DBTT) a ƙananan yanayin zafi. A cikin aikace-aikacen cryogenic (a ƙasa $-40 ^\circ C $), raunin karaya $ K_{Ic}$ yana faɗuwa da sauri, yana sa zoben ya zama mai saurin lalacewa a ƙarƙashin tasiri ko ma lokacin shigarwa. Don waɗannan aikace-aikacen, austenitic bakin karfe kamar 302 ko 316, ko nickel gami, dole ne a yi amfani da su yayin da suke riƙe da tsarin su na cubic (FCC) da taurin kai zuwa sifili.
