Brand :  Huachuang 
Grade:  ASTM A335 Grade P2,P9,P11,P12,P21,P22,P91,
Standard :  ASTM A335
Size Range:  OD: 21.3mm - 609 mm WT: 2.11

Brand :  Huachuang 
Grade:  ASTM A334 Grade 1,Grade 3,Grade 6,Grade 8,Grade 11
Standard :  ASTM A334
Size Range:  OD: 8 mm - 609 mm