... seamless Sch 40 astm a 1061for chemical and heat exchanger 2material:0Cr18Ni9,1Cr19Ni10,00Cr19Ni10,0Cr18NI14Mo3 carbon steel seamless sch40 astm a106 1 ... . Reference standard : ASTM, JIS, EN,API2. material : 1Cr18Ni12Mo2Ti,A268,A376,A213 ... :2.production process3.package4.stock carbon steel seamless Sch 40 astm a 106