Nine Piping Solutions is a well-known firm that distributes a wide range of SS 321 / 321H Forged Threaded Fittings, where post weld heat treatment is not necessary. Stainless Steel 321 Forged Threaded Fittings is used for welding under conditions which prevent a post-weld anneals. Some typical areas of application of Stainless Steel 321H Forged Threaded Fittings are furnace components. Stainless Steel 321 Forged Threaded Elbow Fittings cannot be hardened by thermal treatment, but strength and hardness can be increased substantially by cold working, with subsequent reduction in ductility.
The added titanium content of minimum five times the carbon % content (max 0.7 %) means that Stainless Steel 321H Forged Threaded Tee Fittings also possesses good creep strength and good resistance to chromium carbide precipitation.