Ngokwezinga le-ASTM, izinto ezihlukene ezinezinga lensimbi elihlukile, ngaphandle kwalokho, izakhiwo zazo zemishini nokwakheka kwamakhemikhali, izakhiwo ze-metallurgical zihlukile.Kukhona uhlu lwezinga le-astm elinebanga elihlukile lensimbi.Ukucaciswa Okujwayelekile kwe-ASTM A53 / A53M kwePipe, insimbi, iBla...
Funda kabanzi