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Thermal Stability

Effects of Thermal Exposure on Tensile Properties of 0.5 in Diameter,
Cold-worked (43%) Bar

Initial Material
Condition
Thermal Exposure Test Temperature 0.2% Offset Yield Strength Ultimate Tensile Strength Elongation R.A.
°F °C ksi MPa ksi MPa % %
43% Cold-worked Bar - RT RT 195.1 1345 200.4 1382 18.0 65.2
500 260 181.0 1248 181.1 1249 14.1 60.8
43% Cold-worked Bar 500°F/4000h/AC RT RT 205.8 1419 212.6 1466 16.0 62.6
500 260 176.0 1214 178.5 1231 15.0 61.1
43% Cold-worked Bar 500°F/8000h/AC RT RT 209.9 1447 209.9 1447 16.0 60.7
200 93 192.8 1329 192.8 1329 17.0 63.8
500 260 186.6 1287 186.6 1287 13.4 60.7

AC=Air Cool
RT= Room Temperature
R.A.= Reduction of Area

Effects of Thermal Exposure on Impact Strength of 1 in Diameter, Cold-worked (44%) Bar

Initial Material Condition Thermal Exposure Charpy Impact Energy
ft.ibf J
RT -75°F (-59°C)
44% Cold-worked - 146 (198) 153 (207)
44% Cold-worked 500°F/4000h/AC 136 (184) 135 (183)

AC= Air Cooled
RT= Room Temperature

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