API 5L gabaɗaya yana nufin ƙa'idodin aiwatar da bututun layi, waɗanda bututu ne da ake amfani da su don jigilar mai, tururi, ruwa, da sauransu waɗanda aka haƙa daga ƙasa zuwa masana'antar mai da iskar gas.Bututun layi sun haɗa da bututun ƙarfe maras sumul da bututun ƙarfe na walda.A halin yanzu, nau'ikan bututun karfen da aka saba amfani da su a cikin bututun mai a kasar Sin sun hada da bututun da ke karkashin kasa (SSAW), bututun da ke karkashin ruwa mai tsayi (LSAW), da bututun juriya na lantarki (ERW).Kabu karfe bututu ne kullum zaba a lokacin da bututu diamita ne kasa da 152mm.

Akwai maki da yawa na albarkatun ƙasa don bututun ƙarfe na API 5L: GR.B, X42, X46, X52, X56, X60, X70, X80, da dai sauransu Yanzu manyan masana'antun ƙarfe kamar Baosteel sun haɓaka ƙimar ƙarfe don X100, X120 bututun ƙarfe.Daban-daban karfe maki na karfe bututu da mafi girma bukatun ga albarkatun kasa da kuma samar, da kuma carbon daidai tsakanin daban-daban karfe maki ne tsananin sarrafawa.

Kamar yadda kowa ya sani game da API 5L, akwai ma'auni guda biyu, PSL1 da PSL2.Ko da yake akwai bambancin kalma ɗaya kawai, abin da ke cikin waɗannan ma'auni biyu ya bambanta sosai.Wannan yayi kama da ma'aunin GB/T9711.1.2.3.Dukkansu suna magana akan abu ɗaya, amma buƙatun sun bambanta sosai.Yanzu zan yi magana game da bambanci tsakanin PSL1 da PSL2 daki-daki:

1. PSL shine taƙaitaccen matakin ƙayyadaddun samfur.An rarraba matakin ƙayyadaddun samfurin na bututun layi zuwa PSL1 da PSL2, kuma ana iya faɗi cewa matakin ingancin ya kasu kashi PSL1 da PSL2.PSL2 ya fi PSL1 girma.Waɗannan matakan ƙayyadaddun ƙayyadaddun abubuwa guda biyu ba kawai sun bambanta ba a cikin buƙatun dubawa, amma har ma a cikin abubuwan sinadarai da kaddarorin injina.Sabili da haka, lokacin yin oda bisa ga API 5L, sharuɗɗan da ke cikin kwangilar ba za su nuna alamun da aka saba ba kawai kamar ƙayyadaddun bayanai da matakan ƙarfe ba., Dole ne kuma ya nuna matakin ƙayyadaddun samfur, wato, PSL1 ko PSL2.PSL2 ya fi PSL1 ƙarfi a cikin alamomi kamar abun da ke tattare da sinadarai, kaddarorin juzu'i, ƙarfin tasiri, da gwaji mara lalacewa.

2, PSL1 baya bukatar tasiri yi, PSL2 duk karfe maki ban da x80, cikakken sikelin 0 ℃ Akv matsakaita darajar: a tsaye ≥ 41J, transverse ≥ 27J.X80 karfe sa, cikakken sikelin 0 ℃ Akv matsakaita darajar: a tsaye ≥ 101J, m ≥ 68J.

3. Ya kamata a yi gwajin matsa lamba na ruwa ɗaya bayan ɗaya, kuma ƙayyadaddun ƙayyadaddun ƙayyadaddun ba ya ƙayyadad da ba da damar gwajin da ba zai lalata ba maimakon matsa lamba na ruwa.Wannan kuma babban bambanci ne tsakanin ma'aunin API da ma'aunin Sinanci.PSL1 baya buƙatar dubawa mara lalacewa, PSL2 yakamata ya zama dubawa mara lalacewa ɗaya bayan ɗaya.