Hmmmm.......Steel=Aluminum + Iron, huh? Is that your final answer?
http://en.wikipedia.org/wiki/Steel
Steel is not that good of a conductor of heat when compared to other metals:
http://www.engineeringtoolbox.com/thermal-conductivity-metals-d_858.html
Thermal Conductivity of Metals
Thermal conductivity of some common metals
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Thermal Conductivity - k - is the quantity of heat transmitted, due to unit temperature gradient, in unit time under steady conditions in a direction normal to a surface of unit area. Thermal Conductivity -
k - is used in the
Fourier's equation.
- 1 Btu/(hr [SUP]o[/SUP]F ft[SUP]2[/SUP]/ft) = 1 Btu/(hr [SUP]o[/SUP]F ft) = 1.731 W/(m K) = 1.488 kcal/(h m [SUP]o[/SUP]C)
[TABLE="class: large"]
[TR]
[TD]Metal[/TD]
[TD]
Temperature
-
t -
([SUP]o[/SUP]F)[/TD]
[TD]
Thermal Conductivity
-
k -
(Btu/(hr [SUP]o[/SUP]F ft))[/TD]
[/TR]
[TR]
[TD]Admiralty Brass[/TD]
[TD]68[/TD]
[TD]64[/TD]
[/TR]
[TR]
[TD]Aluminum, pure[/TD]
[TD]68[/TD]
[TD]118[/TD]
[/TR]
[TR]
[TD]200[/TD]
[TD]124[/TD]
[/TR]
[TR]
[TD]400[/TD]
[TD]144[/TD]
[/TR]
[TR]
[TD]Aluminum Bronze[/TD]
[TD]68[/TD]
[TD]44[/TD]
[/TR]
[TR]
[TD]Antimony[/TD]
[TD]68[/TD]
[TD]10.7[/TD]
[/TR]
[TR]
[TD]Beryllium[/TD]
[TD]68[/TD]
[TD]126[/TD]
[/TR]
[TR]
[TD]Beryllium Copper[/TD]
[TD]68[/TD]
[TD]38[/TD]
[/TR]
[TR]
[TD]Bismuth[/TD]
[TD]68[/TD]
[TD]4.9[/TD]
[/TR]
[TR]
[TD]Cadmium[/TD]
[TD]68[/TD]
[TD]54[/TD]
[/TR]
[TR]
[TD]Carbon Steel, max 0.5% C[/TD]
[TD]
68[/TD]
[TD]
31[/TD]
[/TR]
[TR]
[TD]Carbon Steel, max 1.5% C[/TD]
[TD]
68[/TD]
[TD]
21[/TD]
[/TR]
[TR]
[TD]752[/TD]
[TD]19[/TD]
[/TR]
[TR]
[TD]2192[/TD]
[TD]17[/TD]
[/TR]
[TR]
[TD]Cartridge brass (UNS C26000)[/TD]
[TD]68[/TD]
[TD]69.4[/TD]
[/TR]
[TR]
[TD]Cast Iron, gray[/TD]
[TD]70[/TD]
[TD]27 - 46[/TD]
[/TR]
[TR]
[TD]Chromium[/TD]
[TD]68[/TD]
[TD]52[/TD]
[/TR]
[TR]
[TD]Cobalt[/TD]
[TD]68[/TD]
[TD]40[/TD]
[/TR]
[TR]
[TD]Copper, pure[/TD]
[TD]68[/TD]
[TD]223[/TD]
[/TR]
[TR]
[TD]572[/TD]
[TD]213[/TD]
[/TR]
[TR]
[TD]1112[/TD]
[TD]204[/TD]
[/TR]
[TR]
[TD]Copper bronze (75% Cu, 25% Sn)[/TD]
[TD]68[/TD]
[TD]15[/TD]
[/TR]
[TR]
[TD]Copper brass (70% Cu, 30% Zi)[/TD]
[TD]68[/TD]
[TD]64[/TD]
[/TR]
[TR]
[TD]Cupronickel[/TD]
[TD]68[/TD]
[TD]17[/TD]
[/TR]
[TR]
[TD]Gold[/TD]
[TD]68[/TD]
[TD]182[/TD]
[/TR]
[TR]
[TD]Hastelloy B[/TD]
[TD][/TD]
[TD]6[/TD]
[/TR]
[TR]
[TD]Hastelloy C[/TD]
[TD]70[/TD]
[TD]5[/TD]
[/TR]
[TR]
[TD]Inconel[/TD]
[TD]70 - 212[/TD]
[TD]8.4[/TD]
[/TR]
[TR]
[TD]Incoloy[/TD]
[TD]32 - 212[/TD]
[TD]6.8[/TD]
[/TR]
[TR]
[TD]Iridium[/TD]
[TD]68[/TD]
[TD]85[/TD]
[/TR]
[TR]
[TD]Iron, nodular pearlitic[/TD]
[TD]212[/TD]
[TD]18[/TD]
[/TR]
[TR]
[TD]Iron, pure[/TD]
[TD]68[/TD]
[TD]42[/TD]
[/TR]
[TR]
[TD]572[/TD]
[TD]32[/TD]
[/TR]
[TR]
[TD]1832[/TD]
[TD]20[/TD]
[/TR]
[TR]
[TD]Iron, wrought[/TD]
[TD]68[/TD]
[TD]34[/TD]
[/TR]
[TR]
[TD]Lead[/TD]
[TD]68[/TD]
[TD]20[/TD]
[/TR]
[TR]
[TD]572[/TD]
[TD]17.2[/TD]
[/TR]
[TR]
[TD]Manganese Bronze[/TD]
[TD]68[/TD]
[TD]61[/TD]
[/TR]
[TR]
[TD]Magnesium[/TD]
[TD]68[/TD]
[TD]91.9[/TD]
[/TR]
[TR]
[TD]Mercury[/TD]
[TD]68[/TD]
[TD]4.85[/TD]
[/TR]
[TR]
[TD]Molybdenum[/TD]
[TD]68[/TD]
[TD]81[/TD]
[/TR]
[TR]
[TD]Monel[/TD]
[TD]32 - 212[/TD]
[TD]15[/TD]
[/TR]
[TR]
[TD]Nickel[/TD]
[TD]68[/TD]
[TD]52[/TD]
[/TR]
[TR]
[TD]Nickel Wrought[/TD]
[TD]32 - 212[/TD]
[TD]35 - 52[/TD]
[/TR]
[TR]
[TD]Niobium (Columbium)[/TD]
[TD]68[/TD]
[TD]30[/TD]
[/TR]
[TR]
[TD]Osmium[/TD]
[TD]68[/TD]
[TD]35[/TD]
[/TR]
[TR]
[TD]Phosphor bronze (10% Sn, UNS C52400)[/TD]
[TD]68[/TD]
[TD]28.9[/TD]
[/TR]
[TR]
[TD]Platinum[/TD]
[TD]68[/TD]
[TD]42[/TD]
[/TR]
[TR]
[TD]Plutonium[/TD]
[TD]68[/TD]
[TD]4.6[/TD]
[/TR]
[TR]
[TD]Potassium[/TD]
[TD]68[/TD]
[TD]57.8[/TD]
[/TR]
[TR]
[TD]Red Brass[/TD]
[TD]68[/TD]
[TD]92[/TD]
[/TR]
[TR]
[TD]Rhodium[/TD]
[TD]68[/TD]
[TD]86.7[/TD]
[/TR]
[TR]
[TD]Selenium[/TD]
[TD]68[/TD]
[TD]0.3[/TD]
[/TR]
[TR]
[TD]Silicon[/TD]
[TD]68[/TD]
[TD]48.3[/TD]
[/TR]
[TR]
[TD]Silver, pure[/TD]
[TD]68[/TD]
[TD]235[/TD]
[/TR]
[TR]
[TD]Sodium[/TD]
[TD]68[/TD]
[TD]77.5[/TD]
[/TR]
[TR]
[TD]Stainless Steel[/TD]
[TD]68[/TD]
[TD]7-26[/TD]
[/TR]
[TR]
[TD]Tantalum[/TD]
[TD]68[/TD]
[TD]31[/TD]
[/TR]
[TR]
[TD]Thorium[/TD]
[TD]68[/TD]
[TD]24[/TD]
[/TR]
[TR]
[TD]Tin[/TD]
[TD]32[/TD]
[TD]36 - 39[/TD]
[/TR]
[TR]
[TD]Titanium[/TD]
[TD]68[/TD]
[TD]11 - 13[/TD]
[/TR]
[TR]
[TD]Tungsten[/TD]
[TD]68[/TD]
[TD]94 - 100[/TD]
[/TR]
[TR]
[TD]Uranium[/TD]
[TD]68[/TD]
[TD]14[/TD]
[/TR]
[TR]
[TD]Vanadium[/TD]
[TD]68[/TD]
[TD]35[/TD]
[/TR]
[TR]
[TD]Wrought Carbon Steel[/TD]
[TD]32[/TD]
[TD]34[/TD]
[/TR]
[TR]
[TD]Yellow Brass[/TD]
[TD]68[/TD]
[TD]67[/TD]
[/TR]
[TR]
[TD]Zinc[/TD]
[TD]-[/TD]
[TD]67[/TD]
[/TR]
[TR]
[TD]Zirconium[/TD]
[TD]-[/TD]
[TD]145[/TD]
[/TR]
[/TABLE]
- T([SUP]o[/SUP]C) = 5/9[T([SUP]o[/SUP]F) - 32]
- 1 Btu/(hr [SUP]o[/SUP]F ft[SUP]2[/SUP]/ft) = 1 Btu/(hr [SUP]o[/SUP]F ft) = 1.731 W/(m K) = 1.488 kcal/(h m [SUP]o[/SUP]C)