Expanded metal, riffled sheets
Steel riffled sheets as per GOST 8568-77 with one-sided general purpose diamond or lenticular riffles are manufactured in sheets and coils, with riffle height on sheet being 0.2-0.3 of sheet base thickness but not less than 0.5 mm.
Expanded metal sheets are manufactured in accordance with specifications TR 36.26.11-5-8. 1. to produce decks and stairway steps. Grille flooring is used on service decks and gangways in petroleum, gas, petrochemical industries, in power stations and on steel structures of all applications.
For more details see GOST norms & Technical Requirements section.