ASTM A333 Gr.1 Low Fin Tube ASTM A333 Gr.1 is a carbon steel grade specifically designed for low-temperature service. Its key characteristic is excellent impact toughness at sub-zero temperatures, making it suitable for applications where brittle fracture is a concern. The ASTM A333 Gr.1 Low Fin Tube is an integrally finned tubular product manufactured by cold-forming fins from the wall of the base tube. This design significantly increases the external surface area, enhancing