Gabaɗaya akwai buƙatun masu zuwa don karfe don ƙwaƙwalwar shiga.

(1) Abubuwan da ke cikin carbon na ƙarfe an ƙaddara ta yanayin aiki na sassan, wanda zai iya bambanta daga 0.15% zuwa 1.2%. Wannan shine mafi mahimmancin buƙatu kuma ana iya biyan buƙatun tsari ta hanyar dumama shigar.

(2) Karfe ya kamata ya kasance yana da hali cewa hatsin austenite ba su da sauƙin girma. Gabaɗaya, lokacin dumama shigarwa yana ɗan ɗan gajeren lokaci, kuma hatsin ba su da sauƙin girma, amma zafin zafi yana da girma.

(3) Karfe ya kamata ya kasance yana da kyakkyawan tsari na asali iri ɗaya gwargwadon yiwuwa. Karfe na iya samun hatsi mai kyau na austenite da mafi girman zafin zafin da za a iya ba da izini lokacin dumama, wanda ke da mahimmanci musamman lokacin dumama shigar, saboda dumama shigarwa ya fi wahalar sarrafa ƙayyadaddun yanayin zafin jiki daidai fiye da dumama tanderu, kuma zafin zafin ya fi girma. babba.

(4) Don ƙarfe taurin ƙarfe na gabaɗaya, yana da kyau a sarrafa girman hatsi a sa 5 zuwa 8.

(5) Zaɓi abun ciki na carbon. Don wasu mahimman sassa kamar crankshafts, camshafts, da dai sauransu, lokacin zabar maki karfe, ƙarin buƙatu don zaɓin abun ciki na carbon galibi ana sa gaba. Karfe 0.42% ~ 0.50%) an rage zuwa 0.05% kewayon (kamar 0.42% ~ 0.47%), wanda zai iya rage tasirin canje-canje a cikin abun ciki na carbon akan fashe ko canje-canje a cikin zurfin zurfin Layer.

1. Zurfin buƙatun decarburization Layer na sanyi ja karfe. Lokacin da aka yi amfani da ƙarfe mai sanyi don ƙarfafawa, akwai buƙatu don zurfin jimillar abin da aka lalatar da shi a saman. Gabaɗaya, jimillar zurfin Layer decarburization a kowane gefe bai wuce 1% na diamita na mashaya ko kauri na farantin karfe ba. Taurin Layer-carbon-depleted bayan quenching yana da ƙasa sosai, don haka karfen da aka zana sanyi dole ne a niƙa shi daga saman da ke ɗauke da carbon kafin a gwada taurin.