Keywords: Chitoliro chosasunthika cha API, API SCH 40 chitoliro, ASTM API 5L, chitoliro cha carbon steel API n mafakitale osiyanasiyana monga mafuta ndi gasi, petrochemical, ndi kupanga, kusankha chitoliro choyenera cha kayendedwe ka madzi ndi kofunikira. Pulogalamu ya API...
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