... +Z) galvanized steel sheet 1) standard: JIS G3002 GB/T251B 2) Grade: SGCC (DX51D+Z), SGCD (DX52D+Z) 3) Surface finish: regular spangle and zero ... -proof steel,electrically controlled cabinets,galvanized tube/pipe, ceilingchannel,building material,galvanized wire steel tape Surface chromated, oiled,unoiled, zero spangle,small spangle ,regularspangle, large spangle,tension ...