... tubes, which is widely used in boiler, heat exchanger, su We are professional manufacturer of high precision cold drawn seamless ... is widely used in boiler, heat exchanger, superheater, hydraulic and pneumatic cylinder. 2. Standard&material: ASTM A53/A106 Gr. A/B/C, ASTM ... En10305-1 E215, E235, E355, 42CrMo4, 35CrMo4, C35E, and equivalent standard&material. 3. Size range: 38mm-325mm(OD) 1mm-110mm(Wall ...