This austenitic chrome steel grade is understood for its free-machining traits, achieved by the addition of sulfur and selenium. These additions scale back friction throughout machining processes, resulting in improved chip breakage and longer instrument life. Typical functions embody shafts, screws, nuts, and bolts the place ease of fabrication is paramount. Its chemical composition usually consists of chromium (17-19%), nickel (8-10%), and managed quantities of sulfur and selenium.
The improved machinability provided by this particular alloy reduces manufacturing prices and time. Whereas it maintains good corrosion resistance in gentle environments, its sulfur content material barely reduces its weldability and corrosion resistance in comparison with different austenitic grades. Developed as a modification of 304 chrome steel, this variant addresses the challenges related to machining the usual alloy. Its introduction marked a big development within the manufacturing of complicated elements requiring intricate machining operations.