Generally, ferrites are difficult to form in the cold condition. They are formable at room temperature when sheets are no thicker than 3 mm/0.11 in (6 mm/0.23 in for Therma 4713). Machining is considered to be less problematic due to their low strain hardening rates. When welding, the same precautions as for carbon steels are normally required.
Like other austenitic stainless steels, heat-resisting steels can be formed in the hot or cold condition. As a result of their relatively high nitrogen content, the mechanical strength of certain products is higher and consequently greater deformation forces will be required. The relatively high hardness of austenitic stainless steels and their ability to strain harden must be taken into consideration in connection with machining
Outokumpu high temperature steels have good or very good weldability and can be welded using SMA, gas-shielded welding and submerged arc welding.