This austenitic stainless steel grade is known for its free-machining characteristics, achieved through the addition of sulfur and selenium. These additions reduce friction during machining processes, leading to improved chip breakage and longer tool life. Typical applications include shafts, screws, nuts, and bolts where ease of fabrication is paramount. Its chemical composition typically includes chromium (17-19%), nickel (8-10%), and controlled amounts of sulfur and selenium.
The enhanced machinability offered by this specific alloy reduces production costs and time. While it maintains good corrosion resistance in mild environments, its sulfur content slightly reduces its weldability and corrosion resistance compared to other austenitic grades. Developed as a modification of 304 stainless steel, this variant addresses the challenges associated with machining the standard alloy. Its introduction marked a significant advancement in the manufacturing of complex components requiring intricate machining operations.
