... liquid transportation 1-standards:ASTM,GB,DIN,JIS.etc 2-material:carbon steel, alloy steel et ASTM 20# seamless steel pipe ... low and Medium Pressure BoilersGB3087-199910, 20ASTM A179, ASTM A192 ASTM SA179,SA192, BS3059Seamless Steel Tubes for high pressure -- ... Q345, Q390, 10MoVNb, 12CrMo, 15CrMo, 12Cr2MoISO 9329-2-1997 ASTM A161-94Seamless steel tubesfor petroleum crackingGB9948-8610, 20, 12CrMo, ...