... carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating 6Grating StylePlain / Smooth, Serrated /teeth, I bar, serrated I bar 7StandardChina ... ),UK: BS4592-1987, Australia: AS1657-1985, Japan:JIS Keywords : steel grating , bar grating , welded steel grating , Trench grating , serration grating , safety flooring , industrial ...