How does stainless steel thermal expansion affect lid fit over time?
Stainless steel cookware is prized for its durability, but its thermal expansion properties can gradually impact lid fit. When heated, stainless steel expands at a rate of about 16.0-18.0 μm/m·°C, and repeated cycles cause microscopic structural changes. Over months or years of use, this expansion and contraction can lead to warping, particularly if lids are heated faster than pots. The result may be loose-fitting lids that allow steam escape or difficult-to-remove lids when components expand at different rates. Factors like material thickness, heating speed, and cooling methods influence this degradation. To minimize effects, avoid sudden temperature changes and ensure even heating across all components.
