I-ASTM A234 yinkqubo esemgangathweni yemibhobho ye-pube ye-carbon secbon steel kunye nentsimbi ye-ofisi yendlela yobushushu nenobushushu obuphezulu. I-carbon ye-carbon yentsimbi eyenziwe kwi-A234 ihlala inikezelwa kwifom ye-Butet-Welting ngokungqinelana ne-ASME B16.9 okanye i-ASME B16.49. Kukho amanqaku amabini e-carbon amabakala: i-WPB kunye ne-WPC, apho i-ATTM A234 WPB ihlala isetyenziswa kumzi-mveliso wepayipi. I-A234 WPB ye-A234 WPB ye-WOTB-WOIL ye-Welbows ibandakanya izithombe, ukugoba, ibuyise, i-tees, i-CAPS, i-rock, i-niples kunye nokuhlangana.
Emva kokwenza ubushushu obuphakathi, amaqondo athobekileyo athobelwe kubushushu obungaphantsi koluhlu oluchanekileyo phantsi kweemeko ezifanelekileyo zokuthintela isiphene esibonakalayo esibangelwa kukuphola ngokukhawuleza, kodwa kungekho mazwi aphezulu. Amaqondo obushushu atyhafileyo achaziweyo yintsimbi (inxalenye) yobushushu. Izixhobo ezihluthwe ngamandla kufuneka ziphathwe ngokomhlathi 7 kwinkcazo ye-A960 \ / A960m.