I-ASTM A53umgangatho nguMbutho waseMelika woVavanyo kunye neZixhobo. Umgangatho uquka ubungakanani obuhlukeneyo bemibhobho kunye nobukhulu kwaye usebenza kwiinkqubo zemibhobho ezisetyenziselwa ukuthutha iigesi, ulwelo kunye nolunye ulwelo. Umbhobho oqhelekileyo we-ASTM A53 usetyenziswa ngokuqhelekileyo kwiindawo zoshishino kunye noomatshini, kunye nakwishishini lokwakha ukubonelela ngamanzi, ukufudumeza kunye neenkqubo zomoya.

Ngoku kaI-ASTM A53umgangatho, imibhobho inokwahlulwa ibe ziindidi ezimbini: Uhlobo F kunye noHlobo lwe-E. Uhlobo lwe-F lungumbhobho ongenamthungo kunye nohlobo lwe-E ngumbhobho odibeneyo wombane. Zombini iintlobo zemibhobho zifuna unyango lobushushu ukuqinisekisa ukuba iimpawu zabo zomatshini kunye nokwakheka kweekhemikhali zihlangabezana neemfuno eziqhelekileyo. Ukongezelela, iimfuno zomphezulu wombhobho kufuneka zihambelane nemimiselo yomgangatho we-ASTM A530 / A530M ukuqinisekisa umgangatho wokubonakala kwayo.

Iimfuno zemichiza yeemibhobho eziqhelekileyo ze-ASTM A53 zilandelayo: umxholo wekhabhoni awudluli i-0.30%, umxholo we-manganese awudluli i-1.20%, umxholo we-phosphorus awudluli i-0.05%, umxholo wesulfure awudluli i-0.045%, umxholo we-chromium awudluli. I-0.40%, kunye ne-nickel content ayidluli i-0.40%, umxholo wobhedu awudluli i-0.40%. Ezi zithintelo zokubunjwa kweekhemikhali ziqinisekisa amandla, ukuqina kunye nokumelana nokubola kombhobho.

Ngokubhekiselele kwiipropati zoomatshini, umgangatho we-ASTM A53 ufuna ukuba amandla okuqina kunye namandla emveliso emibhobho ayikho ngaphantsi kwe-330MPa kunye ne-205MPa ngokulandelelanayo. Ukongezelela, umlinganiselo wokwandisa umbhobho uneemfuno ezithile zokuqinisekisa ukuba awuqhelekanga ukuphuka okanye ukuguqulwa ngexesha lokusetyenziswa.

Ukongeza kwizakhiwo zeekhemikhali kunye nezixhobo zemishini, umgangatho we-ASTM A53 ubonelela ngemimiselo ecacileyo malunga nobukhulu kunye nokubonakala komgangatho wemibhobho. Ubungakanani bombhobho buvela kwi-1/8 intshi ukuya kwi-intshi ye-26, kunye neentlobo ezahlukeneyo zokukhetha udonga. Umgangatho wokubonakala kombhobho ufuna indawo egudileyo ngaphandle kwe-oxidation ebonakalayo, iintanda kunye neziphene zokuqinisekisa ukuba aziyi kuvuza okanye zonakaliswe ngexesha lofakelo kunye nokusetyenziswa.

Ngokubanzi, umgangatho we-ASTM A53 ngumgangatho obalulekileyo wemibhobho ye-carbon steel. Iquka iimfuno zokwakheka kweekhemikhali, iimpawu zomatshini, imilinganiselo kunye nomgangatho wokubonakala kwemibhobho. Imibhobho eveliswa ngokwalo mgangatho inokuqinisekisa umgangatho ozinzile kunye nokusebenza okuthembekileyo, kwaye ifanelekile kwiinkqubo zombhobho kwiindawo ezahlukeneyo zoshishino kunye nokwakhiwa. Ukuqulunqwa kunye nokuphunyezwa kwemigangatho ye-ASTM A53 kubaluleke kakhulu ekuqinisekiseni ukusebenza ngokukhuselekileyo kwemibhobho kunye nokukhuthaza umgangatho wokwakhiwa kweprojekthi.