Karfe suna da thermoplastic kuma ana iya matse su lokacin zafi (ƙarfe daban-daban na buƙatar yanayin zafi daban-daban). Wannan shineake kira malleability.
Malleability ikon kayan ƙarfe don canza siffar ba tare da fashewa ba yayin aiki na matsa lamba. Ya haɗa da ikon yin jujjuya guduma, jujjuyawa, miƙewa, extrusion, da sauransu a cikin yanayi mai zafi ko sanyi. Malleability yana da alaƙa da sinadarai na kayan ƙarfe.

1. Menene tasirin titanium akan kaddarorin da malleability nakarfe?
Titanium yana tace hatsin karfe. Rage zafi fiye da kima na karfe. Abun da ke cikin titanium a cikin karfe bai kamata ya zama mai yawa ba, lokacin da abun ciki na carbon ya fi sau 4, zai iya rage girman zafin jiki na karfe, wanda ba shi da kyau don ƙirƙira.
Titanium yana da juriya mai kyau na lalata, yana ƙara titanium zuwabakin karfe(an ƙara zuwa AISI321 karfe) na iya kawar da ko rage abubuwan lalata na intercrystalline.

2. Menene tasiri na vanadium akan kaddarorin da rashin daidaituwa na karfe? Vanadium yana ƙara ƙarfi, ƙarfi da taurin ƙarfe.
Vanadium yana da ƙaƙƙarfan hali don samar da carbides da tasiri mai karfi akan gyaran hatsi. Vanadium na iya rage yawan zafin ƙarfin karfe, ƙara yawan zafin jiki na ƙarfe, kuma don haka inganta ƙarancin ƙarfe.
Vanadium a cikin solubility na baƙin ƙarfe yana da iyaka, sau ɗaya fiye da yadda za a sami tsarin kristal, ta yadda yanayin raguwar filastik, juriya na lalacewa ya karu.

3. Menene tasirin sulfur akan kaddarorin da malleability nakarfe?
Sulfur abu ne mai cutarwa a cikin karfe, kuma babban cutarwa shine gatsewar zafikarfe. A solubility na sulfur a cikin m bayani ne musamman kananan, kuma shi hadawa da sauran abubuwa don samar da inclusions kamar FeS, MnS, NiS, da dai sauransu FeS ne mafi cutarwa, da kuma FeS Forms cokuns da Fe ko FeO, wanda melts a 910 ~ 985C da rarraba a cikin hatsi iyaka a cikin cibiyar sadarwa, ƙwarai rage plasticity na karfe da brittle.
Manganese yana kawar da ɓarna mai zafi. Saboda manganese da sulfur suna da alaƙa mai girma, sulfur a cikin karfe yana samar da MnS tare da babban narkewa maimakon FeS.

4. Menene tasirin phosphorus ke da shi akan kaddarorin da malleability nakarfe?
Phosphorus kuma abu ne mai cutarwa a cikin karfe. Ko da abun da ke cikin sinadarin phosphorus a cikin karfe ya kai 'yan dubbai ne kawai, tokawar karfen zai karu saboda hazo na sinadarin FegP, musamman a karancin zafin jiki, wanda ke haifar da "karfe mai sanyi". Don haka iyakance adadin phosphorus.
Phosphorus yana rage weldability nakarfe, kuma yana da sauƙi don samar da fashewar walda lokacin da ya wuce iyaka. Phosphorus na iya inganta aikin yankan, don haka ana iya ƙara abun ciki na phosphorus a cikin ƙarfe kafin yankan sauƙi.