ASTM A334Darasi na 1bututun ƙarfe ne mara sumul kuma welded don sabis na ƙarancin zafin jiki.
Yana da matsakaicin abun ciki na carbon na 0.30%, abun ciki na manganese na 0.40-1.60%, ƙaramin ƙarfi na 380Mpa (55ksi), da ƙarfin amfanin ƙasa na 205Mpa (30ksi).
Ana amfani da shi musamman don jigilar ruwa a cikin ƙananan yanayin zafi, kayan sanyi, da sauran aikace-aikacen masana'antu waɗanda ke buƙatar juriya mai ƙarancin zafin jiki.
ASTM A334 yana da maki da yawa don ma'amala da mahalli masu ƙarancin zafi daban-daban, wato:Darasi na 1, Darasi na 3, da na 6, da na 7, da na 8, da na 9, da na 11.
Karfe nau'i biyu ne, carbon karfe da kuma gami karfe.
Darasi na 1kumaDarasi na 6su ne duka carbon steels.
Ana iya samar da su ta hanyarsumul ko welded matakai.
A cikin samar da bututun ƙarfe mara nauyi, akwai matakai biyu na samarwa,An gama zafi ko sanyi.
Zaɓin zaɓi ya dogara ne akan ƙarshen amfani da bututu, girman girman bututu, da takamaiman buƙatun don kayan kayan.
Da ke ƙasa akwai zane na tsarin samarwa mara nauyi da aka gama da zafi.
Thezafi gamawaTsarin bututu maras sumul ya haɗa da dumama billet ɗin ƙarfe zuwa babban zafin jiki sannan kuma samar da bututu ta hanyar birgima ko extruding.Wannan tsari yana faruwa a yanayin zafi mai zafi kuma yana taimakawa wajen inganta ƙananan kayan aiki, ta haka yana ƙara yawan ƙarfinsa da daidaituwa.
Tsarin ƙarewa mai zafi ya dace musamman don samar da manyan diamita da bututu masu kauri, waɗanda aka saba amfani da su a cikin bututun sufuri na jama'a da aikace-aikacen tsarin, kuma ya dace da samar da ƙarar girma saboda ƙarancin farashi.
Sanyi-jawoAna sarrafa bututun ƙarfe mara nauyi ta hanyar shimfiɗawa bayan an sanyaya kayan gaba ɗaya don cimma daidaitaccen girman da siffar da ake buƙata.Wannan hanya tana haɓaka daidaiton girman girman da saman saman samfurin, yayin da tasirin aikin sanyi kuma yana haɓaka kayan aikin injin bututu, kamar ƙarfi da juriya.
Tsarin zane mai sanyi yana da kyau sosai don kera bututu tare da ƙananan diamita da kauri na bango na bakin ciki inda ake buƙatar madaidaicin madaidaicin inganci kuma ana amfani da shi sosai a cikin yankuna kamar tsarin na'ura mai aiki da ƙarfi, kayan aikin mota, da kayan aiki mai ƙarfi don saduwa. ƙayyadaddun buƙatun ayyuka masu girma, kodayake a farashi mafi girma.
Daidaita ta dumama zuwa daidaitaccen zafin jiki wanda bai ƙasa da 1550 °F [845 ° C] da sanyi a cikin iska ko cikin ɗakin sanyaya na tanderun da ke sarrafa yanayi ba.
Idan ana buƙatar fushi, zai buƙaci a yi shawarwari.
Don maki na sama na bututun ƙarfe mara sumul kawai:
Maimaita da sarrafa zafi mai zafi da zafin jiki na aikin gamawa mai zafi zuwa kewayon zafin jiki na ƙarshe daga 1550 - 1750 °F [845 - 955 ℃] da sanyi a cikin tanderun yanayi mai sarrafawa daga farkon zafin jiki na ƙasa da 1550 °F [ 845 ° C.
An ƙirƙira sinadarai na daraja 1 don daidaita ƙarfi, taurin, da ƙarancin zafin jiki don aikace-aikace a cikin ƙananan yanayin zafi.
| Daraja | C(Carbon) | Mn(Manganese) | P(Phosphorus) | S(sulfur) |
| Darasi na 1 | max 0.30% | 0.40-1.06% | max 0.025% | max 0.025% |
| Ga kowane raguwar 0.01 % carbon ƙasa da 0.30 %, haɓakar 0.05 % manganese sama da 1.06 % za a ba da izini zuwa matsakaicin 1.35 % manganese. | ||||
Carbon shine babban abin da ke ƙara ƙarfi da taurin ƙarfe, amma a cikin aikace-aikacen ƙananan zafin jiki, babban abun ciki na carbon na iya rage taurin kayan.
Mataki na 1, tare da matsakaicin abun ciki na carbon na 0.30%, an rarraba shi azaman ƙananan ƙarfe na carbon kuma ana sarrafa shi a ƙaramin matakin don haɓaka ƙarancin zafinsa.
Ƙididdiga mafi ƙanƙantar ƙimar haɓakawa ga kowane 1/32 in. [0.80 mm] raguwa a kaurin bango.
Ana gudanar da gwaje-gwajen tasiri akan bututun ƙarfe na Mataki na 1a -45°C [-50°F], wanda aka tsara don tabbatar da ƙarfin hali da juriya na tasiri na kayan aiki a cikin ƙananan yanayin zafi.Ana yin gwajin ta hanyar zaɓar ƙarfin tasiri mai dacewa dangane da kaurin bango na bututun ƙarfe.
Samfuran tasirin tasirin da aka ƙera zai kasance na katako mai sauƙi, nau'in Charpy, daidai da Hanyoyin Gwaji E23.Nau'in A, tare da darajan V.
Hanyoyi guda biyu na yau da kullun na auna taurin sune gwajin taurin Rockwell da Brinell.
| Daraja | Rockwell | Brinell |
| ASTM A334 Darasi 1 | B 85 | 163 |
Kowane bututu ba za a gwada shi ba ta hanyar lantarki ko na ruwa ba daidai da STM A1016/A1016M.Sai dai in an bayyana shi a cikin odar siyayya, nau'in gwajin da za a yi amfani da shi zai kasance a zaɓi na masana'anta.
Baya ga alamomin da aka ƙayyade a cikin Ƙayyadaddun A1016/A1016M, alamar za ta haɗa da ƙare mai zafi, zane mai sanyi, maras kyau, ko walda, da haruffan "LT" da zafin jiki wanda aka yi gwajin tasiri.
Lokacin da ƙaƙƙarfan bututun ƙarfe bai isa girman isa don samun ƙaramin samfurin tasiri ba, alamar ba za ta haɗa da haruffa LT da zafin gwajin da aka nuna ba.
An yi amfani da shi sosai a cikin aikace-aikacen masana'antu iri-iri masu buƙatar aiki mai ƙarancin zafi.
Cryogenic ruwa sufuri: Grade 1 karfe bututu ana amfani da yadu don safarar cryogenic ruwaye kamar liquefied Natural gas (LNG), liquefied petroleum gas (LPG), da sauran cryogenic sunadarai.Wadannan ruwaye galibi suna buƙatar jigilar su cikin aminci a yanayin zafi ƙasa da yanayi, kuma bututun ƙarfe na Grade 1 yana kiyaye halayensa na zahiri da amincin tsarinsa a waɗannan ƙananan yanayin zafi.
Tsarin firiji da kayan aikiYawancin lokaci ana amfani da bututun isar da ruwa a cikin waɗannan tsarin.
Masu musayar zafi da na'urorin haɗi: Masu musayar zafi da na'urori masu mahimmanci suna da mahimmanci a cikin sassan masana'antu da makamashi, sau da yawa suna amfani da bututun ƙarfe na Grade 1 azaman kayan gini.Waɗannan na'urori suna buƙatar kayan da ke kula da ƙarfin ƙarfi da juriya na lalata a ƙananan yanayin zafi don tabbatar da amincin aiki na dogon lokaci da inganci.
Ma'ajiyar sanyi da wuraren sanyaya: A cikin ma'ajiyar sanyi da sauran wuraren shayarwa, dole ne a daidaita tsarin bututun zuwa yanayin zafi sosai.Za a iya amfani da bututun ƙarfe na daraja 1 don gina tsarin bututun a cikin waɗannan wurare saboda ikonsa na ci gaba da aiki a cikin yanayin sanyi ba tare da kasawa ba.
1. EN 10216-4: P215NL, P255QL;
2. DIN 17173:TTSt35N;
3. JIS G3460:STPL 380;
4. GB/T 18984: 09Mn2V.
An tsara waɗannan ma'auni da maki don samun kamanni ko daidai kaddarorin ASTM A334 Grade 1, la'akari da ƙarancin zafin jiki da sauran ƙa'idodin aiki masu dacewa.
Tun lokacin da aka kafa shi a cikin 2014, Botop Steel ya zama babban mai samar da bututun ƙarfe na carbon a Arewacin kasar Sin, wanda aka sani don kyakkyawan sabis, samfurori masu inganci, da cikakkun mafita.Kamfanin yana ba da nau'ikan bututun ƙarfe na carbon da samfuran da ke da alaƙa, waɗanda suka haɗa da marasa ƙarfi, ERW, LSAW, da bututun ƙarfe na SSAW, da kuma cikakken jeri na kayan aikin bututu da flanges.
Kayayyakinsa na musamman sun haɗa da gawa mai daraja da austenitic bakin karafa, waɗanda aka keɓance don biyan buƙatun ayyukan bututun.
