439 stainless steel type 439 is a stabilized ferritic stainless steel chromium content 17. 0 min, 19. 0 max. With a higher chromium cr content than type 409, Which offers improved corrosion resistance. T439 is stabilized with a titanium ti addition, Which results in good weldability. The alloy resists intergranular corrosion and stress-related corrosion fissures it features a higher thermal conductivity and lower coefficient of expansion than type 304. End users include manufacturers household appliances and architectural, Of automotive, Kitchen equipment exhaust components, Heat exchanger tubing structures. Available in cold rolled 2b or 2d surface finishes. Available thicknesses range from . 015 to . 250. 439 comes in dual, Stabilized uns 43932 or titanium, Only stabilized uns 43035 versions of which either version performs equally in all environments.