Thermal Conductivity of Stainless Steel 304, 316 at Various Temperatures

Definition of Thermal Conductivity

Thermal conductivity also called heat conductivity, refers to the the heat transferred “K”, due to the unit temperature gradient, under steady conditions, in a unit time, in the direction perpendicular to the surface per unit area, and when the heat transfer depends only on the temperature gradient.

SI unit: W/m·K or W/m·°C
Imperial unit: Btu/ft·h·°F

Thermal Conductivity of Stainless Steel

This article summarizes the thermal conductivity of stainless steel 304 and 316 at various temperatures in annealed condition, also other stainless steel grades.

Thermal Conductivity of Stainless Steel at Various Temperatures
Stainless steel	Temperature, 100 °C (212 °F)	Temperature, 500 °C (932 °F)
Stainless steel	W/m·K (Btu/ft·h·°F)	W/m·K (Btu/ft·h·°F)
304	16.2 (9.4)	21.5 (12.4)
316	16.2 (9.4)	21.5 (12.4)
201	16.2 (9.4)	21.5 (12.4)
202	16.2 (9.4)	21.6 (12.5)
301	16.2 (9.4)	21.5 (12.4)
302	16.2 (9.4)	21.5 (12.4)
302B	15.9 (9.2)	21.6 (12.5)
303	16.2 (9.4)	21.5 (12.4)
302Cu	11.2 (6.5)	21.5 (12.4)
305	16.2 (9.4)	21.5 (12.4)
308	15.2 (8.8)	21.6 (12.5)
309	15.6 (9.0)	18.7 (10.8)
310	14.2 (8.2)	18.7 (10.8)
314	17.5 (10.1)	20.9 (12.1)
317	16.2 (9.4)	21.5 (12.4)
317L	14.4 (8.3)
321	16.1 (9.3)	22.2 (12.8)
347	16.1 (9.3)	22.2 (12.8)
384	16.2 (9.4)	21.5 (12.4)
405	27.0 (15.6)
410	24.9 (14.4)	28.7 (16.6)
414	24.9 (14.4)	28.7 (16.6)
416	24.9 (14.4)	28.7 (16.6)
420	24.9 (14.4)
422	23.9 (13.8)	27.3 (15.8)
429	25.6 (14.8)
430, 430F	26.1 (15.1)	26.3 (15.2)
431	20.2 (11.7)
434		26.3 (15.2)
436	23.9 (13.8)	26.0 (15.0)
439	24.2 (14.0)
440A, 440C	24.2 (14.0)
444	26.8 (15.5)
446	20.9 (12.1)	24.4 (14.1)
PH 13-8 Mo	14.0 (8.1)	22.0 (12.7)
15-5 PH	17.8 (10.3)	23.0 (13.1)
17-4 PH	18.3 (10.6)	23.0 (13.1)
17-7 PH	16.4 (9.5)	21.8 (12.6)