>>57987They should have tossed it full-speed-ahead too, reversing only reduced available momentum needed for turning.
Also, the company head, J. Bruce Ismay, wanted to get to New York faster, so he ordered all the boilers to be lit.
Also it wasn't a gash, but multiple plate buckles as the berg was brushing along side, complete with the majority of the damage below the water line, you had the natural pressure of the water rushing in to the relatively small yet multiple buckles along the hull. On top of all that as you mentioned, the steel was inferior grade and became brittle in temperatures of freezing point and below.
It wasn't just a fail boat, just too much drama for one boat to handle.
Primary reasons Titanic failed.
Ego, Inferior Steel, bad management, and overconfidence
On other notes, the disaster was first to use SOS (SOS for easy morse code 3 dots 3 dashes 3 dots) over CQD (which actually spelled, "Come Quick Danger")
The first ice patrol was set up, dedicated wireless operators, and also procedures for navigating the north atlantic during the ice season.