Integral Low Fin Tube - ASTM A334 Gr.1 Low Temperature Carbon Steel for Enhanced Heat Transfer Description: Integral low fin tubes are manufactured by cold forming the outer surface of a seamless tube to raise low fins directly from the base metal. Since the fins are integral with the tube wall, there is no contact resistance, ensuring excellent thermal efficiency and mechanical strength. ASTM A334 Grade 1 low-temperature carbon steel tubes are designed for enhanced heat