What do you call t-shaped steel bar?

When working with hot steel, the best analogy I’ve used is that metal becomes a lot like clay when heated.  Your job is to shape it like you would clay.  To make things long and skinny, you can grab a piece of clay and stretch it, and it just breaks.  Unfortunately, it takes a bit more work than that to stretch a piece of metal. Steel is not Silly Putty.

You use basic forces to move your metal.  To make a long, skinny piece out of a short fat piece, you squeeze the sides of the metal, and turn the work.  If you take a square of clay and squeeze it on the four sides repeatedly, it eventually becomes a long, thin polygon.

There are three fundamental ways to apply force (again, there are more, but we’re keeping it simple).