High Temperature Properties

Cyclic Oxidation Resistance

WEIGHT GAIN - GRAMS PER SQUARE METER OF SURFACE FOR TEMPERATURES SHOWN
ALLOY 705C 815C 980C 1090C
409 0.1 0.8 1430* 10,000*
430 0.4 1.3 1660* 10,000*
304 0.2 1.7 3400 10,000*
309 0.2 2.7 120 910

NOTE: These were cyclic tests for 100 hours duration in air containing 10% water vapor. Cycled every 2 hours to room temperature then back to test temperature. Weight gain (or loss) measured without purposeful removal of scale.

*Some of the higher temperature tests were for much shorter time than the 100 hours.

TENSILE and YIELD STRENGTH AT TEMPERATURES SHOWN (ksi)
  24C 540C 650C
Alloy Tensile Yield Tensile Yield Tensile Yield
304 87 39 55 18 44 16
309S 90 45 67 36 54 28
310 95 45 70 24 58 19
316 84 40 67.5 28 55 24
321 79 31 57.5 26 45 21
347 95 40 60 20.5 50.5 20
*403 110 75 65 52 87 n/a
*410 125 108 75 n/a 20 n/a

NOTE: Alloys indicated by * were tested in heat treated condition, others in annealed condition.

1000 HOUR STRESS-RUPTURE AT TEMPERATURES SHOWN
Alloy 538C 650C 815C
304 37 17 4
309S n/a 19 4
310S 32 18 6
316 n/a 24 7
347 49 23 4
410 19 n/a n/a
430 18 5 1

General Information on High Temperature Properties:

Allowable stresses for austenitic (300 series) stainless steel unfired pressure vessels are found in Section VIII of the ASME Boiler Code, table UHA-23. Additional information on high temperature properties can also be found in the ASM Metals Handbook, Volume 3, 10th Edition.

POISSON'S RATIO AT TEMPERATURES SHOWN
  TEMPERATURE
ALLOY 150C 260C 370C 480C 595C 705C 815C
304 0.28 0.30 0.32 0.28 0.29 0.28 0.25
309 0.28 0.30 0.30 0.29 0.27 0.32 0.25
310 0.32 0.31 0.31 0.32 0.34 0.34 0.29
316 0.26 0.29 0.34 0.30 0.32 0.31 0.24
321 0.23 0.25 0.27 0.30 0.29 0.27 n/a
347 0.30 0.31 0.29 0.33 0.31 0.35 0.28

By definition, Poisson's ratio is the ratio of lateral strain to longitudinal strain for a material subjected to uniform longitudinal stresses within the proportional limit.

 

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