Steelix being a set-up bait for Ferrothorn, Skarmory, and Forretress is not that appealing...
However, it is one of those Steels that can soak up Outrages AND is not owned by Magnezone.
Gyro Ball and EQ are staples to hit Dragons and Steel Types, respectively. Roar / Dragon Tail is good to rack up Spikes damage, whereas Explosion would prevent Steelix from being utter set-up bait.
Sheer Force provides a few more options to Steelix, though. Thunder Fang 2HKOs Bulky Gyarados with minimal Atk investment. It also needs minimal investment to 3HKO Forretress and Ferrothron with Sheer Force Fire Fang, so they are both useful. Steelix would need ~120 Atk EVs to 3HKO a max HP/Def Gyarados after an Intimidate with Thunder Fang and 252 HP / 208 Def Jellicent with Crunch, respectively.