Mun yi bayani dalla-dalla kan muhimman abubuwan da ke tsakanin kayan biyu (ƙarfe mai laushi ko bakin ƙarfe) a ƙasa. Bakin ƙarfe ya fi ɗorewa a yanayin gishiri kuma ana iya amfani da shi a masana'antar abinci, yayin da ƙarfe mai laushi ya fi ƙarfi kuma yana iya ƙara matsin lamba ga tururuwa.

karfe mai laushi:
Karfe mai laushi, wanda aka fi sani da ƙarfen carbon, shine nau'in ƙarfe da aka fi amfani da shi a duk aikace-aikacensa, kuma maƙallan bututu ba banda bane. Hakanan yana ɗaya daga cikin manyan matakan ƙarfe waɗanda ke rufe nau'ikan kayan injiniya iri-iri. Wannan yana nufin cewa fahimtar da ƙayyade madaidaicin matakin na iya yin babban tasiri ga aikin samfurin da aka gama. Misali, damuwa da buƙatun zanen ƙarfe waɗanda ke samar da bangarorin jikin motoci sun bambanta sosai da na kayan shigar bututu. A zahiri, ƙayyadaddun kayan maƙallan bututun da ya dace ba iri ɗaya bane da harsashi da madauri.

Ɗaya daga cikin rashin kyawun ƙarfe mai laushi shine yana da ƙarancin juriya ga tsatsa ta halitta. Ana iya shawo kan wannan ta hanyar shafa wani shafi, wanda galibi zinc ne. Bambancin hanyoyin shafa da ƙa'idodi yana nufin cewa juriya ga tsatsa na iya zama yanki ɗaya inda maƙallan bututu suka bambanta sosai. Ma'aunin Burtaniya don maƙallan bututu yana buƙatar awanni 48 na juriya ga tsatsa ja da ake gani a cikin gwajin fesa gishiri mai tsaka tsaki na 5%, kuma yawancin samfuran kite marasa alama ba su cika wannan buƙata ba.

Bakin karfe:
Bakin karfe ya fi sarkakiya fiye da ƙarfe mai laushi ta hanyoyi da yawa, musamman idan ana maganar matse bututu, domin masana'antun da ke da araha galibi suna amfani da gaurayen nau'ikan kayan aiki daban-daban don samar da samfurin da ƙarancin farashin masana'antu da kuma rage aiki.

Yawancin masana'antun manne na bututu suna amfani da ƙarfen ferritic bakin ƙarfe a madadin ƙarfe mai laushi ko kuma azaman madadin ƙarfe mai rahusa fiye da ƙarfe mai austenitic bakin ƙarfe. Saboda kasancewar chromium a cikin ƙarfen, ƙarfen ferritic (wanda ake amfani da shi a cikin matakan W2 da W3, a cikin jerin matakai 400) ba sa buƙatar wani ƙarin sarrafawa don inganta juriyar tsatsa. Duk da haka, rashin ko ƙarancin abun ciki na nickel na wannan ƙarfe yana nufin cewa kaddarorinsa sun yi ƙasa da ƙarfe mai austenitic bakin ƙarfe ta hanyoyi da yawa.

Karfe masu bakin ƙarfe na Austenitic suna da mafi girman matakin juriya ga tsatsa ga dukkan nau'ikan tsatsa, gami da acid, suna da mafi girman kewayon zafin aiki, kuma ba su da maganadisu. Gabaɗaya, ana samun maki 304 da 316 na sandunan ƙarfe na bakin ƙarfe; duka kayan aikin an yarda da su don amfani a cikin ruwa da kuma amincewar Lloyd's Register, yayin da maki na ferritic ba za su iya ba. Hakanan ana iya amfani da waɗannan maki a masana'antar abinci da abin sha, inda acid kamar acetic, citric, malic, lactic da tartaric acid ba za su iya ba da damar amfani da ƙarfe ferritic ba.