The common post used for
chain link fence is round post. But angle iron post can replace it if you have a tight budget. It’s a comparatively easy way to support chain link.
Angle iron posts are quick and straight forward to install. Concreting of intermediate angle iron posts is optional depending on the ground conditions, so the fence is quicker to erect.
The angle iron can be galvanized or powder coated, so it can match the color or surface of your chain link fence. Then you fence will looked more concerted. About the size, 40*4mm can used as line port, 40*6mm can used as corner & end post to make a stronger support.