Stair Treads

Stair Treads
The steel stair treads are made of grating bars, including aluminum perforated stair treads, expanded grating and steel perforated stair treads. Stair treads is often banded with flats and can be welded with plate ( perforated plate or checkered plate or other plates) or not.

Aluminum grating stair treads is generally anodized or powder coating for longer lifetime. Expanded grating is usually with no surface treatment and steel grating is hot-dipped galvanized to make it anti corrosion.

The galvanized serrated stair treads generally adopt hot galvanized technique, electro galvanized or paint surface treatment, and paint should be sprayed before antirust paint, in order to achieve long-term anti-corrosion effect.
http://www.hygrating.com/stair-treads.html