Will Steel Body Armor Shatter at Sub Zero (-76°F) Temps? AR500 Armor Level III+

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Test Gun: Springfield M1A, 22" barrel, Stag Arms Model 1 16" barrel,
Test Taken: 45 feet
Rounds Used: 5.56x45mm: M193,
7.62x51mm, 147gr M80 Ball
Armor Used: AR500 Armor Level III+: https://goo.gl/76R6Lh

Temperature: 62.8°F
Humidity: 60%
Baro: 30.36"HG
Dew Point: 48.7°F
Elevation: 849 Feet

We were curious about structural integrity of steel at extreme cold temps. We used the environmental chamber to cool 1 plate to -60°C for about 48hrs. We shot the first plate that was at an ambient 60°F as a baseline

all velocities are in feet per second (fps)
Ambient plate results:
5.56x45mm M193:
3,129 - Stopped
3,159 - Stopped
3,159 - Stopped

7.62x51mm M80:
2,824 - stopped
2,812 - stopped
2,812 - stopped

Frozen plate results:
5.56x45mm M193:
3,152 - stopped
3,137 - stopped
3,182 - stopped
3,167 - stopped
3,167 - stopped
3,212 - stopped
3,144 - stopped
3,197 - stopped
3,167 - stopped

7.62x51mm M80:
2,766 - stopped
2,783 - stopped
2,807 - stopped
2,836 - stopped
2,807 - stopped

Camera(s): Canon Rebel T6S, Canon HF R500, GoPro HD Hero 3+ Black Edition, iPhone 6
Edited with: Adobe Premiere Elements 14
Audio: Zoom H5
Music: Intro Music Provided Royalty Free by Ritual Suicide Copyright 2013