ASTM A252 wani tsari ne da aka ƙera musamman don amfani da bututun ƙarfe na bututu.
ASTM A252 ya shafi tarin bututun da silinda na ƙarfe ke aiki a matsayin memba na dindindin mai ɗaukar kaya, ko kuma a matsayin harsashi don samar da tarin siminti da aka yi da siminti.
Aji na 2 da aji na 3 su ne biyu daga cikin waɗannan azuzuwan.
An raba A252 zuwa matakai uku tare da ingantattun halayen injiniya a jere.
Su ne: Aji 1, Aji 2, da kumaAji na 3.
Aji na 2 da Aji na 3 sune maki da aka fi amfani da su a ASTM A252, kuma za mu yi bayani dalla-dalla game da halayen maki biyu a gaba.
ASTM A252ana iya ƙera shi ta hanyar walda mai ƙarfi, walda mai juriya, walda mai walƙiya, ko hanyoyin walda mai haɗaka.
A aikace-aikacen tarin bututu, bututun ƙarfe marasa sumul suna ba da tallafi mai kyau saboda ƙarfinsu mai yawa da halayen ƙarfi iri ɗaya.
Bugu da ƙari, ana iya ƙera bututun ƙarfe marasa shinge tare da kauri mai kauri sosai, wanda ke ba su damar jure wa matsin lamba mai yawa, yana ƙara inganta amincinsu a cikin tsarin tallafi.
Duk da haka, ana iya samar da bututun ƙarfe marasa sulɓi har zuwa matsakaicin diamita na 660 mm, wanda ke iyakance amfaninsu a aikace-aikacen da ke buƙatar manyan tarin diamita. A wannan yanayin,LSAW(Welded na Longitudinal Submerged Arc) da kumaSSAWBututun ƙarfe (Spiral Submerged Arc Welded) sun fi amfani.
Yawan phosphorus bai wuce 0.050% ba.
Ba a buƙatar wasu abubuwa.
Ƙarfin Tashin Hankali da Ƙarfin Yawa ko Matsayin Yawa
| Aji na 2 | Aji na 3 | |
| Ƙarfin tauri, min | 60000 psi[415 MPa] | 60000 psi[415 MPa] |
| Ma'aunin yawan aiki ko ƙarfin yawan aiki, min | 35000 psi[240 MPa] | 45000 psi[310 MPa] |
Ƙarawa
Ana iya samun ƙarin bayani a cikinCikakkun bayanai na bututun ASTM A252.
| Jeri | Tsara | Faɗin |
| Nauyi | Nauyin Ka'ida | Kashi 95% - 125% |
| Diamita na Waje | Diamita ta Waje da aka ƙayyade | ± 1% |
| Kauri a Bango | kauri na bango da aka ƙayyade | minti 87.5% |
| Tsawon bazuwar guda ɗaya | 16 zuwa 25 ƙafa [4.88 zuwa 7.62 mita], inci |
| Tsawon bazuwar sau biyu | sama da ƙafa 25 [mita 7.62] tare da matsakaicin matsakaicin ƙafa 35 [mita 10.67] |
| Tsawon iri ɗaya | tsayi kamar yadda aka ƙayyade tare da bambancin da aka yarda da shi na ±1 in. |
ASTM A370: Hanyoyin Gwaji da Ma'anoni don Gwajin Inji na Kayayyakin Karfe;
ASTM A751: Hanyoyin Gwaji, Ayyuka, da Kalmomi don Nazarin Sinadarai na Kayayyakin Karfe;
ASTM A941: Kalmomi Masu Alaƙa da Karfe, Bakin Karfe, Alloys Masu Alaƙa, da Ferroalloys;
ASTM E29: Aikin Amfani da Muhimman Lambobi a cikin Bayanan Gwaji don Tabbatar da Daidaitawar Bayanai;
Botop Steel kamfani ne mai kera bututun ƙarfe na carbon mai inganci kuma mai samar da shi daga China, kuma mai siyar da bututun ƙarfe mara matsala, yana ba ku nau'ikan hanyoyin magance bututun ƙarfe iri-iri!
ASTM A252 GR.3 Bututun Karfe na Carbon LSAW (JCOE) na Tsarin ASTM A252 GR.3
