Official Answer
Answer
'Blueing' ko rage damuwa shine tsarin zafi inda ake dumama maɓuɓɓugan ƙarfe na carbon zuwa kusan $600^{\circ}F$ zuwa $700^{\circ}F$ ($315^{\circ}C$ zuwa $370^{\circ}C$) na wani takamaiman lokaci. Wannan zafin jiki yana ƙasa da kewayon canji amma yana da girma don ba da izinin sake rarraba ragowar damuwa da aka jawo yayin aikin murɗawa da dagawa. Wannan tsari yana daidaita girman bazara kuma yana inganta rayuwar gajiya ta hanyar rage kololuwar damuwa ta ciki. Wani sakamako na gefe shine samuwar Layer oxide mai shuɗi-baki (magnetite, $ Fe_3O_4 $), wanda ke ba da ƙarancin juriya na lalata, kodayake ƙarin mai ko phosphate shafi yawanci ana buƙata don yanayin masana'antu.
