... , Q 235, Q 195, Q345, 27SiMn 30 inch seamless steel pipe 10#,20#,45#,16Mn, ASTM A106 Gr.B, ASTM ... . SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor structural purposeGB/T8162-199910, 20, 35, 45, 40Mn2, 45Mn2, 27SiMn, 20Cr, 40Cr, ... 20ASTM A179, ASTM A192 ASTM SA179,SA192, BS3059Seamless Steel Tubes for high pressure --Chemical fertilizer equipmentGB6479-8610, 20G, Q345, ...