Carbide precipitation can occur in non-stabilized grades of austenitic stainless steels if held within which of the following temperature ranges for a long enough period of time?

The correct answer pertains to the temperature range of 800°F to 1650°F, where carbide precipitation can indeed occur in non-stabilized grades of austenitic stainless steels. This phenomenon is a result of the thermal exposure of these materials within this specific temperature range.

When austenitic stainless steels are heated within the 800°F to 1650°F range, particularly between about 1000°F and 1400°F, the chromium in the steel can combine with carbon to form chromium carbides. This precipitation can create a localized depletion of chromium in the surrounding matrix, leading to decreased corrosion resistance, especially in environments where sensitization has occurred.

It's important to note that non-stabilized grades do not contain sufficient quantities of titanium or niobium, which are typically added to stabilize the structure against carbide precipitation at these elevated temperatures. This vulnerability makes it critical for designers and engineers to be aware of heat treatment processes and post-weld heat treatment practices to mitigate the risk of carbide precipitation and ensure long-term corrosion resistance and structural integrity in service.

The other temperature ranges mentioned, including below 500°F and above 1650°F, do not facilitate the same level of carbide formation in non-stabilized stainless steels.