... , HL(Hair Line) ,Polished 4.ShapeRound,rectangular,square5. Applications Petroleum, chemical industry, chemical fiber, smelt, medical machinery, papermaking, heat preservation and refrigeration, mechanical ... , navigation shipbuilding, environmental protection and boiler heat exchangerAmerican Standard(ANSI) CHEMICAL COMPOSITION(%)GradeC (Max)Mn (Max)P (Max)S (Max)Si ...