0.45 mm galvanized roofing sheet steel grade: SPCC, SGCC, DX51D thickness: 0.17~4.0mm ... , ASTM A 653. Material Grade: SGCC, SGCD1, SGCD2,DX51D+Z, DX52D+Z, DX53D+D,etc2)Thickness: 0.17~4.0mm. Thickness tolerance ... EN 10142, ASTM A 653.MaterialSGCC, SGCD1, SGCD2,DX51D+Z, DX52D+Z, DX53D+D,etcSurfaceChromated, unoiled/oiled, minimum or regular spangle Mill ...