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U-Factor

U-Factor

U-Factor

(OP)
While reading some specifications for Duplex Stainless Steel Castings and Forgings, I came accross the term "U-Factor". It says here that this factor is dependent on the weight percentage of Si, Cr and Mo.

Can somebody help me understand the significance of this factor and where else it might be used?

Thanks

RE: U-Factor

Normally, U-factor refers to the heat transmissivity of a medium, and is the inverse of the R-factor

http://www.combustionresearch.com/Infra-Spec/infra-spec...

Alloying elements could well change the conductivity, hence the U-factor.

... although, by the way you described it, it doesn't sound like the correct definition for the context.

Anyway, good luck

RE: U-Factor

(OP)
kclim,

heres a relation that defines the U-factor

U = 4.76*Si + 2.65*Cr + 3.44*Mo - 43.64

I dont think this relation determines the conductivity in any way. There must be some other explaination.

thanks for your help

RE: U-Factor

Time to send McGuire a wake-up call.  Anyone know his number? <g>

RE: U-Factor

The elements listed in the equation are ferrite stabilisers, although the constants don't match anything i've seen.

I found a similar equation to yours, although there are a lot more elements listed.

http://www.metal-powder.net/julyaug03Routesfeat.html

(near the bottom)

Km = Cr + 6 x (Si) + 8 x (Ti) + 4 x (Mo) + 2 x (Al) - 2 x (Mn) - 4 x (Ni) - 40 (C + N) - 20 x (P) - 5 x (Cu)

an equation regarding the balance between ferrite and martensite.

Hope that helps

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