steel grating 1.material:stainless steel,mild steel 2.surface:smooth or serrated ... .finish:black painted,mill,galvanized hot dipped galvanized steel grating 1.Material: SS302,SS304,SS316,SS310,SS314,SS201,SS430,SS321 2 ... ,P - painted,U - untreated6.Grating standard:1)China: YB/T4001.1-2007(YB/T4001.1-1998) 2)Britain: BS4592-1:1995) 3)US: ANSI/NAAMM(MBG531 ...