Kushin naɗe ƙarfe abu ne da ake amfani da shi wajen rufewa, wanda aka yi shi da ƙarfe daban-daban (kamar bakin ƙarfe, jan ƙarfe, aluminum) ko kuma abin ɗaurewa na ƙarfe. Yana da kyakkyawan sassauci da juriyar zafin jiki mai yawa, juriyar matsi, juriyar tsatsa da sauran halaye, don haka yana da amfani iri-iri a masana'antar bawul.

Kushin lanƙwasa ƙarfe cikin hikima yana amfani da juriyar zafi, juriya da ƙarfin ƙarfe da kuma laushin kayan da ba na ƙarfe ba, don haka aikin rufewa ya fi kyau, kuma aikin kushin lanƙwasa mai lanƙwasa na tef ɗin bakin ƙarfe shine mafi kyau. Rabon matsi kafin matsi ya fi na kushin lanƙwasa na asbestos, kuma babu lahani na leaking na asbestos fiber capillary. A cikin mai, ana amfani da 0Cr13 don zare na ƙarfe, yayin da ake ba da shawarar 1Cr18Ni9Ti don sauran hanyoyin watsawa.

Bakin karfe mai lankwasawa mai sassauƙa a cikin iskar gas, amfani da matsin lamba na 14.7MPa, a cikin ruwan za a iya amfani da shi har zuwa 30MPa. Zafin jiki -190~+600℃(idan babu iskar oxygen, ana iya amfani da ƙarancin matsin lamba zuwa 1000℃).

Kushin da ke lanƙwasa ya dace da masu musayar zafi, masu samar da wutar lantarki, bututun mai, bawuloli, da kuma finfunan shiga da fita na famfo tare da babban matsin lamba da canjin zafin jiki. Don matsakaicin matsin lamba ko mafi girma da yanayin zafi sama da 300 ° C, ya kamata a yi la'akari da amfani da zoben ciki, na waje ko na ciki. Idan ana amfani da finfin mai lanƙwasa da mai lanƙwasa, finfin rauni tare da zoben ciki ya fi kyau.

Ana iya samun kyakkyawan tasirin rufewa ta hanyar manna faranti masu sassauƙa na graphite a ɓangarorin biyu na faifan lanƙwasa mai sassauƙa na graphite. Boiler ɗin zafi na babban masana'antar takin zamani muhimmin kayan aiki ne mai zafi da matsin lamba mai yawa. Ana amfani da faifan lanƙwasa mai sassauƙa na graphite mai zobe na waje, wanda baya zubewa lokacin da nauyin ya cika, amma yana zubewa lokacin da aka rage nauyin. Ana ƙara farantin graphite mai sassauƙa mai kauri 0.5mm a ɓangarorin biyu na gasket ɗin kuma a yanka shi zuwa siffar baka. An yi ɓangaren haɗin gwiwa da haɗin lanƙwasa mai kusurwa, wanda ake amfani da shi sosai.