1carbon steel seamless Sch 40 astm a 1061for chemical and heat exchanger 2material:0Cr18Ni9,1Cr19Ni10, ... ,API2. material : 1Cr18Ni12Mo2Ti,A268,A376,A213,A249,A2683. application : a: For heat exchange b: for boiler c: Water delivery 4 ... . advantage :a: without oxidation both outer wall and inner wall b: ... .package4.stock carbon steel seamless Sch 40 astm a 106