SS 309 is the nickel and chromium-based austenitic SS and it is utilized for those parts that request oxidation obstruction, heat impediment, and crumbling opposition. Strength at various temperatures is indistinct from the 18/8 SS. This material is having incredible oxidation hindrance limit notwithstanding the grouch and high adaptability at extremely high temperatures. It is besides gigantically invulnerable to marine environment and is moreover viewed as a power safe material.