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(01 May 2006) FITNET MK7K is defined as follows:K=2αE/(eπρc)(c)where;α = coefficient of thermal expansion, o C -1E = Young’s modulus, N/mm 2e = 2.718ρ = density, kg/mm 3c = specific heat, J/kg o CThe material properties are taken at ambient temperature ( 20 C ). Typical values of the relevant propertiesare listed in Table C.1. Taking a typical value of process efficiency, η= 0.8, gives the following values of Kη:Ferritic steels,Austenitic stainless steels,Aluminium alloys,Kη = 122 Nmm/JKη = 161 Nmm/JKη = 131 Nmm/JTable C. 2 Typical material propertiesPropertyFerriticSteelsAusteniticStainless Steelscoefficient of thermal expansion, α, o C -1 12 x 10 -6 16 x 10 -6 24 x 10 -6Young’s modulus, E, N/mm 2 207 000 193000 70 000Volumetric specific heat, ρc, Jmm 3 / o C 0.0038 0.0036 0.0024K=2αE/(eπρc), Nmm/J 153 201 164Aluminium Alloys© FITNET 2006 – All rights reserved <strong>Annex</strong> C.33
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