(1) A lokacin aiwatar da extrusion, yawan zafin jiki na rufin bututun karfe yana ci gaba da karuwa yayin da aikin extrusion ya ci gaba. A ƙarshen extrusion, zafin jiki a cikin yanki na bangon ciki na rufin kusa da extrusion ya mutu yana da girma, ya kai 631 ° C. Zazzabi na rufin tsakiya da silinda na waje baya canzawa da yawa.

(2) A cikin marasa aiki jihar, matsakaicin daidai danniya na karkace karfe bututu ne 243MPa, wanda aka yafi mayar da hankali a kan ciki bango na karkace bututu. A cikin yanayin zafin jiki, matsakaicin ƙimarsa shine 286MPa, an rarraba shi a tsakiyar bangon bangon ciki na rufin. A karkashin yanayin aiki, matsakaicin matsakaicin nauyinsa shine 952MPa, wanda aka fi rarraba a cikin yanayin zafi mai zafi a saman ƙarshen bangon ciki. Yankin maida hankali a cikin bututun ƙarfe na karkace ya fi rarraba a cikin yanki mai zafi sosai, kuma rarrabawar sa daidai yake da rarraba zafin jiki. Matsakaicin zafin jiki wanda ya haifar da bambancin zafin jiki yana da tasiri mafi girma akan rarraba damuwa na ciki na karkace bututun ƙarfe.

(3) A radial danniya a karkace karfe bututu. A cikin yanayin da ba ya aiki, bututun ƙarfe na karkace ya fi shafa ta hanyar prestress da aka bayar ta hanyar prestress na waje. Bututun ƙarfe na karkace yana cikin yanayin damuwa a cikin radial shugabanci. Mafi girman darajar shine 113MPa, wanda aka rarraba akan bangon waje na bututun ƙarfe na karkace. A cikin yanayin zafi mai zafi, matsakaicin ƙarfin radial ɗin sa shine 124MPa, galibi ya mai da hankali kan fuskoki na sama da na ƙasa. A cikin yanayin aiki, matsakaicin matsa lamba na radial shine 337MPa, wanda aka fi mayar da hankali a cikin babban ƙarshen yanki na bututun ƙarfe na karkace.