A metallurgical analysis of steel taken from the hull of the Titanic's
wreckage reveals that it had a high ductile-brittle transition temper
ature making it unsuitable for service at low temperatures; at the tim
e of the collision, the temperature of the sea water was -2 degrees C.
The analysis also shows, however, that the steel used was probably th
e best plain carbon ship plate available at the time of the ship's con
struction.