Most stainless grades are poor conductors of heat, which is another downside. Never cook a steak in a stainless frying pan.
Thermal Conductivity:
Copper - 380 W/m K
Aluminum - 150 to 240 depending on alloy content
Cast Iron - 52
Carbon steel - 54 (@0.5% carbon, ad drops off the higher the carbon and/or alloying content)
Stainless 304 - 14.4
The very high thermal conductivity of aluminum is also a contributor to why things burn easily in an aluminum pot/pan, but helps if you only have a low energy heat source.
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