products: API 5L Steel pipe and tubing Size: 1/2"-96" inspection: X-Ray test Certificate: API material: carbon steel SpecificationsChina ... 21990Seamless Steel TubesGB3087-199910, 20ASTM A179, ASTM A192for low and Medium Pressure BoilersASTM SA179,SA192, BS3059Seamless Steel TubesGB6479-8610, ... 12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo, JIS G3441-1988for petroleum cracking API 5L Steel pipe and tubing