... I bar, ISO9001, GRATING SPECIALIST! David TEL: +8613757445098 black steel floor grating ,manufacturer of steel bar grating ,metal grating panel ,ISO9001-2008 & SGS ... A36, A1011, A569, Q235, S275JR, SS304, SS400, Mild steel & Low carbon steel, etc 5Surface TreatmentBlack, self colour, hot dip galvanized, painted ... 1985,Germany: DIN24537-1-2006, Japan: JIS (Mr. David Huang) black steel floor grating