|
|
You are here: Home > Material Behavior >
Steel >
StainlessSteel >
thermalProperties.htm
|
|
Contact
Us | FAQ |
|
|
Stainless Steel Thermal Properties
|
|
The thermal properties of stainless steel are
quite different from those of carbon steel. The main differences
are:
- The rate of thermal expansion of stainless steel remains
relatively constant up to 1200°C compared to carbon
steel because stainless steel does not experience phase
transformation.
- The magnitude of thermal expansion of stainless steel is
greater than the thermal expansion of carbon steel.
- The specific heat of stainless steel increases slightly
at elevated temperatures, compared to carbon steel, which
has a huge increase in specific heat at 730°C due to
a chemical transformation from ferrite-pearlite to austentite.
- At ambient temperature, stainless steel has a much lower
thermal conductivity compared to carbon steel. However,
the thermal conductivity of stainless steel increases at
elevated
temperatures which will exceed the value of carbon steel
above 1000°C.
The thermal elongation of austenitic stainless steel Δl/l may be determined by:
 |
(1) |
where
| l |
is the length at room temperature of stainless
steel member; |
| Δl |
is the temperature induced elongation of stainless steel
member; |
| θa |
is the steel temperature [°C]. |
The variation of the thermal elongation with temperature is shown
in Figure 1.
|
Figure 1: Thermal Elongation of Stainless Steel
as a Function of Temperature |
The specific heat of stainless steel ca [in
J/kg•K] may be determined by:
 |
(2) |
The variation of the specific heat with temperature is shown in Figure
2:
|
Figure 2: Specific heat of stainless steel as a
function of temperature |
The thermal conductivity of stainless steel ca [in
W/m•K]
may be determined by:
 |
(3) |
The variation of the thermal conductivity with
temperature is shown in Figure
3.
Figure 3: Thermal conductivity of stainless steel as a function of
temperature
|
|
|
|
|
| |
|
|
|
