... cold drawn seamless tubes, which is widely used in boiler, heat exchanger, su We are professional manufacturer of high precision cold ... drawn seamless tubes, which is widely used in boiler, heat exchanger, superheater, hydraulic and pneumatic cylinder. 2. Standard&material: ASTM ... A53/A106 Gr. A/B/C, ASTM A179, ASTM A192, ASTM A209 T1, ASTM A210-A/C, ASTM A213 T5, T9, T11 ...