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Thermal Conductivity of Stainless Steel

The advanced Guarded Heat Flow Meter (GHFM-01) is a primary measurement of thermal resistance and thermal conductivity for solids, such as metals, polymers, composites, and paste. Specifically, the calculation of thermal conductivity from the measurement of thermal resistance is the most accurate method of testing the true thermal conductivity of heterogeneous materials. The steady-state measurement of thermal resistance represents the full sample thickness and mature heat transfer properties.

GHFM-01 Guarded Heat Flow Meter

Picture 1. Thermtest Guarded Heat Flow Meter (GHFM-01).

The GHFM-01 follows ASTM E1530-19 for testing the thermal resistance and thermal conductivity of solids from 20°C to 300°C. The Thermtest proprietary test stack replaces the traditional pneumatic movement with advanced motor control, which allows automated control of testing sample thickness, force, or pressure applied.

GHFM-01 Features

Materials Metals, Polymers, Composites, and Pastes
Type of Sensors Thermocouples (x6)
Applications General Testing
Direction Through-Thickness
Thermal Conductivity Range 0.1 to 40 W/m·K
Measurement Time 40 to 60 min
Accuracy ± 3%
Repeatability ± 1 to 2%
Plate Temperature Range* -20 to 310 °C
Pressure Automated up to 379 kPa (55 psi)
Sample Diameter 50 to 50.8 mm
Sample Thickness Up to 25mm | Thin-films down to 0.01mm with optional software

*chilled circulator included with each system

Measuring Stainless Steel with the GHFM-01

The experimental result showed a decreasing trend in the thermal conductivity of stainless steel with increasing temperature.

Mean
Temperature
(°C)		 Known Thermal
Conductivity
(W/m·K)		 Measured Thermal
Conductivity
(W/m·K)		 %
Error
40 15.06 14.81 1.69
60 15.38 15.17 1.36
80 15.70 15.41 1.85
100 16.01 15.75 1.66
120 16.33 16.03 1.83
140 16.64 16.35 1.77
160 16.96 16.64 1.89
180 17.27 17.00 1.59
200 17.59 17.40 1.07
220 17.91 17.87 0.20
240 18.22 18.34 0.66
260 18.54 18.78 1.33
280 18.85 19.30 2.35

 

Table 1. Experimental results for the effect of increasing temperature on thermal conductivity & resistance for Stainless Steel (AISI 304)

 

Stainless Steel 304 graph

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