... customers' requirementsMark As customers’ needInternational Standard ISO 9001;2000 APIStandardSeamless – ASTM A106, API 5L, ASTM A179, , ASTM ... A53, ASTM A192, ASTM A333 Welded – API 5L, ASTM A53,ASTM A671/ A672. High yield ... , X80, PSL 1,2.And some other international standard and grade.Material1) CARBON STEEL: ASTM A106 GR. ... B & C/, ASTM A333 GR. 3/6 & API-5L-GR. B/X42/X46/X52/X60/X65/X75 ...