20G:GB5310-95 yarda misali karfe (kasashen waje m sa: Jamus ST45.8, Japan STB42, Amurka SA106B), shi ne mafi yawan amfani tukunyar jirgi karfe bututu, sinadaran abun da ke ciki da inji Properties da 20 farantin ne m guda. Karfe yana da ƙayyadaddun ƙarfi a cikin zafin jiki da matsakaicin matsakaicin zafin jiki, ƙarancin abun ciki na carbon, mafi kyawun filastik da tauri, ƙirarsa mai zafi da sanyi da aikin walda yana da kyau. An yafi amfani a yi na high matsa lamba da kuma mafi girma sigogi na tukunyar jirgi kayan aiki, low zafin jiki sashe superheater, reheater, economizer da ruwa bango, da dai sauransu Kamar kananan diamita bututu bango zafin jiki ≤500℃ dumama surface bututu, da ruwa bango bututu. economizer tube, babban diamita bututu bango zafin jiki ≤450℃ tururi bututu, tarin akwatin (economizer, ruwa bango, low zafin jiki superheater da reheater hada guda biyu akwatin), matsakaici zazzabi ≤450℃ bututu na'urorin haɗi. Saboda carbon karfe zai samar da graphitization a cikin dogon lokaci aiki sama 450 ℃, don haka da dogon lokacin da matsakaicin matsakaicin sabis zafin jiki na dumama surface bututu ne mafi kyau iyakance zuwa kasa 450 ℃. Karfe a cikin wannan kewayon zafin jiki, ƙarfinsa na iya saduwa da buƙatun superheater da bututun tururi, kuma yana da juriya mai kyau na iskar shaka, filastik, tauri, kayan walda da sauran kayan sarrafa sanyi da zafi suna da kyau sosai, ana amfani da su sosai. Sassan karfen da ake amfani da su a cikin tanderun Iran (yana nufin saiti guda) sune bututun shigar ruwa (ton 28), bututun shigar ruwa (ton 20), bututun haɗin tururi (ton 26), kwandon tattalin arziki (8) ton), da tsarin rage ruwa (ton 5), sauran kuma ana amfani da su azaman lebur karfe da kayan derrick (kimanin tan 86).

Sa-210c (25MnG): Lambar karfe inASME SA-210misali. Karamin bututu ne mai diamita na karfen manganese na carbon manganese don tukunyar jirgi da masu zafi, da ƙarfe mai ƙarfi mai zafi mai siffar lu'u-lu'u. A cikin 1995, an dasa shi zuwa GB5310 kuma an sanya masa suna 25MnG. Abubuwan sinadaran sa suna da sauƙi, sai dai mafi girman carbon da manganese, sauran suna kama da 20G, don haka ƙarfin amfanin gona yana da kusan 20% sama da 20G, kuma filastik da taurin suna kama da 20G. Tsarin samar da karfe yana da sauƙi kuma aikin sanyi da zafi yana da kyau. Yin amfani da shi maimakon 20G, zai iya rage kauri daga bangon, rage yawan kayan aiki, amma kuma zai iya inganta yanayin zafi na tukunyar jirgi. Abubuwan da ake amfani da shi da zafin jiki na amfani da su iri ɗaya ne da 20G, galibi ana amfani da su don zafin aiki a ƙasa da bangon ruwa na 500 ℃, tattalin arziƙin ƙasa, superheater mai ƙarancin zafin jiki da sauran abubuwan haɗin gwiwa.
Sa-106c: Yana da lambar karfe a cikiASME SA-106misali. Bututun karfe ne na carbon-manganese don manyan tukunyar jirgi mai zafi mai zafi da masu zafi. Abubuwan sinadaran sa yana da sauƙi, kama da 20G carbon karfe, amma abun ciki na carbon da manganese ya fi girma, don haka ƙarfinsa yana da kusan 12% fiye da 20G, kuma filastik, taurin ba shi da kyau. Tsarin samar da karfe yana da sauƙi kuma aikin sanyi da zafi yana da kyau. Yin amfani da shi a maimakon 20G mai tara masana'antu (mai tattalin arziki, bangon sanyaya ruwa, ƙaramin zafin jiki mai zafi da akwatin hadawa na reheater), za'a iya rage kaurin bango ta kusan 10%, wanda ba zai iya adana farashin kayan kawai ba, amma kuma rage yawan aikin walda. da inganta bambancin damuwa lokacin da akwatin hadawa ya fara.
15Mo3 (15MoG): Yana da bututun ƙarfe a cikin DIN17175 misali. Karamin diamita ne na carbon molybdenum karfe bututu don tukunyar jirgi da superheater, da nau'in lu'u-lu'u mai zafi mai ƙarfi. A cikin 1995, an dasa shi zuwa GB5310 kuma an sanya masa suna 15MoG. Abubuwan sinadaran sa yana da sauƙi, amma yana ƙunshe da molybdenum, don haka yana da mafi kyawun ƙarfin zafi fiye da carbon karfe yayin da yake riƙe da aikin tsari iri ɗaya kamar carbon karfe. Saboda kyawun aikinsa, farashi mai arha, an yi amfani da shi sosai a duniya. Duk da haka, karfe yana da hali zuwa graphitization bayan dogon lokaci aiki a high zafin jiki, don haka ta aiki zafin jiki ya kamata a sarrafa a kasa 510 ℃, da kuma adadin Al kara da cewa smelting ya kamata a iyakance ga sarrafawa da kuma jinkirta graphitization tsari. An fi amfani da wannan bututun ƙarfe don ƙaramin zafin jiki mai zafi da ƙarancin zafin jiki. Yanayin zafin bango yana ƙasa da 510 ℃. Abubuwan sinadaransa C0.12-0.20, SI0.10-0.35, MN0.40-0.80, S≤0.035, P≤0.035, MO0.25-0.35; Matsayin ƙarfin al'ada σs≥270-285, σb≥450-600 MPa; Plastic delta 22 ko sama da haka.