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tofumaster
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Join Date: May 2010
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Thermal Diffusivity - Carbon Steel or High Tensile Alloy BS705?

09/07/2010 4:20 AM

I want to ask which material has a higher thermal diffusivity? Carbon steel or high tensile alloy bs705?

I am selecting either one of these to machine into shaft and going to do some welding on it. It seems that material with higher thermal diffusivity, the welding will produce smaller HAZ.
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Economist
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#1

Re: Thermal Diffusivity - Carbon Steel or High Tensile Alloy BS705?

09/07/2010 11:53 AM

A search for high tesile alloy bs705 in matweb.com does not return anything. What kind of alloy is this?

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tofumaster
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#2

Re: Thermal Diffusivity - Carbon Steel or High Tensile Alloy BS705?

09/07/2010 8:32 PM

it's alloy steel...BS705 equivalent would be AISI4340
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#3
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Re: Thermal Diffusivity - Carbon Steel or High Tensile Alloy BS705?

09/07/2010 8:57 PM

You can calculate the thermal diffusivity by using the thermal conductivity over the density times the specific heat capacity. The values for AISI 4340 Density 7.85 g/cc Specific Heat Capacity 0.475 J/g-°C Thermal Conductivity 44.5 W/m-K

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tofumaster
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#4

Re: Thermal Diffusivity - Carbon Steel or High Tensile Alloy BS705?

09/07/2010 9:09 PM

what about Carbon steel? Like A36 ?
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#5
In reply to #4

Re: Thermal Diffusivity - Carbon Steel or High Tensile Alloy BS705?

09/07/2010 10:46 PM

Same thing. The data is available at http://www.matweb.com It's a great resource for information on all kinds of materials.

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