I-ASTM A53umgangatho yi-American Society for Testing and Materials. Lo mgangatho ugubungela iintlobo ngeentlobo zeepayipi kunye nobukhulu kwaye usebenza kwiinkqubo zepayipi ezisetyenziselwa ukuthutha iigesi, ulwelo kunye nezinye izinto ezilulwelo. Iipayipi ezisemgangathweni ze-ASTM A53 zisetyenziswa kakhulu kwiindawo zoshishino kunye nezoomatshini, kunye nakwishishini lokwakha kwiinkqubo zokubonelela ngamanzi, zokufudumeza kunye nezomoya.

Ngoku kaI-ASTM A53Ngokwemigangatho, imibhobho inokwahlulwahlulwa ibe ziintlobo ezimbini: Uhlobo F kunye nohlobo E. Uhlobo F ngumbhobho ongenamthungo kwaye uhlobo E ngumbhobho odibeneyo ngombane. Zombini ezi ntlobo zemibhobho zifuna unyango lobushushu ukuqinisekisa ukuba iipropati zazo zoomatshini kunye nokwakheka kweekhemikhali kuhlangabezana neemfuno ezisemgangathweni. Ukongeza, iimfuno zomphezulu wombhobho kufuneka zihambelane nemimiselo yomgangatho we-ASTM A530/A530M ukuqinisekisa umgangatho wokubonakala kwawo.

Iimfuneko zokwakheka kweekhemikhali kwimibhobho eqhelekileyo ye-ASTM A53 zezi zilandelayo: umxholo wekhabhoni awudluli kwi-0.30%, umxholo we-manganese awudluli kwi-1.20%, umxholo we-phosphorus awudluli kwi-0.05%, umxholo wesalfure awudluli kwi-0.045%, umxholo we-chromium awudluli kwi-0.40%, kwaye umxholo we-nickel awudluli kwi-0.40%, umxholo wobhedu awudluli kwi-0.40%. Le miqathango yokwakheka kweekhemikhali iqinisekisa amandla, ukuqina kunye nokumelana nokugqwala kombhobho.

Ngokuphathelele iipropati zoomatshini, umgangatho we-ASTM A53 ufuna ukuba amandla okutsalwa kunye namandla okukhupha imibhobho angabi ngaphantsi kwe-330MPa kunye ne-205MPa ngokwahlukeneyo. Ukongeza, izinga lokunwebeka kombhobho likwaneemfuno ezithile zokuqinisekisa ukuba awuchaphazeleki kukwaphuka okanye ukuguquka ngexesha lokusetyenziswa.

Ukongeza kwimilo yeekhemikhali kunye neempawu zoomatshini, umgangatho we-ASTM A53 ukwabonelela ngemigaqo eneenkcukacha ngobukhulu kunye nomgangatho wembonakalo yemibhobho. Ubungakanani bemibhobho buqala kwi-1/8 intshi ukuya kwi-26 intshi, kunye neendlela ezahlukeneyo zobukhulu bodonga. Umgangatho wembonakalo yombhobho ufuna umphezulu ogudileyo ongena-oxidation ecacileyo, imifantu kunye neziphene ukuqinisekisa ukuba awuyi kuvuza okanye yonakale ngexesha lokufakwa nokusetyenziswa.

Ngokubanzi, umgangatho we-ASTM A53 ngumgangatho obalulekileyo kwiipayipi zentsimbi yekhabhoni. Ugubungela iimfuno zokwakheka kweekhemikhali, iimpawu zoomatshini, ubukhulu kunye nomgangatho wembonakalo yeepayipi. Iipayipi eziveliswa ngokwalo mgangatho zinokuqinisekisa umgangatho ozinzileyo kunye nokusebenza okuthembekileyo, kwaye zifanelekile kwiinkqubo zepayipi kwiindawo ezahlukeneyo zoshishino nezokwakha. Ukuqulunqwa kunye nokusetyenziswa kwemigangatho ye-ASTM A53 kubaluleke kakhulu ekuqinisekiseni ukusebenza ngokukhuselekileyo kweepayipi kunye nokukhuthaza umgangatho wokwakhiwa kweprojekthi.