A cikin masana'antar bakin karfe, 201 yana wakiltar wani abu.201 bakin karfe yana nufin 201 bakin karfe da karfe resistant acid.201 Bakin Karfe na nufin karfen da yake juriya ga raunin matsakaici kamar yanayi, tururi da ruwa, yayin da karfe mai juriya na acid yana nufin karfe mai juriya ga lalata matsakaicin sinadarai kamar acid, alkali da gishiri, kuma tsarin tsarin kasa shine 1Cr17Mn6Ni5N.
201 bakin karfe yana da wasu juriya na acid da alkali, babban yawa, polishing ba tare da kumfa, babu pinholes da sauran halaye.Ana amfani da shi don samar da lokuta daban-daban na agogo da madauri kayan murfin ƙasa.An fi amfani dashi don yin bututu na ado, bututun masana'antu da wasu samfuran miƙewa mara zurfi.
202 alama ce ta Amurka, wanda ya maye gurbin 1Cr18Ni9.Austenitic bakin karfe yana da yanayin canjin canji, don haka ana iya amfani dashi azaman karfe mai jure zafi.Don yin austenitic bakin karfe sha lokaci canji, shi dole ne a mai tsanani zuwa fiye da 1000 ℃.A 350 ℃, babu wani canji a cikin tsarin metallographic, wato, ba za a sami canji na asali a cikin kaddarorin karfe ba.Zai fadada kawai saboda dumama, amma canjin yana da ƙananan kuma ana iya watsi da shi a ƙarƙashin yanayi na al'ada.Saboda haka, 202 bakin karfe yana da kyakkyawan juriya na zafin jiki.Saboda aikin sa, bakin karfe 202 ana amfani da shi sosai wajen gyaran gine-gine, aikin injiniya na birni, shingen tsaro na babbar hanya, wuraren otal, manyan kantuna, faranti na gilashi, wuraren jama'a da sauran wurare.
