A234 WPB Karfe Pie Sugtings yana nufin bututun mai dacewa da kayan masarufi, yana nufin an weld pipping, psion yana nufin an weld, psive yana nufin sannu da ƙarfi, p yana nufin matsi, b shine aji B, koma zuwa ƙaramar yawan amfanin ƙasa, kamar Astm A106 A53, Gr.b ko API 5L.B.A234 WPB shine mafi yawan birbon Carbon Carbon Karfe.