The national standard requirements for wall thickness of galvanized steel pipes vary according to their type and use. The following is a detailed introduction:
Welded galvanized steel pipe. The standard wall thickness range of Grade A welded galvanized steel pipe is 1.0mm to 7.5mm; the standard wall thickness range of Grade B welded galvanized steel pipe is 1.6mm to 12mm; the standard wall thickness range of Grade C welded galvanized steel pipe is 2.0mm to 16mm.
Seamless galvanized steel pipe. The standard wall thickness range of Grade A seamless galvanized steel pipe is 2.0mm to 12mm; the standard wall thickness range of Grade B seamless galvanized steel pipe is 3.0mm to 14mm; the standard wall thickness range of Grade C seamless galvanized steel pipe is 3.5 mm to 16mm.
General purpose welded steel pipe. The wall thickness series of general-purpose welded steel pipes specified in GB/T3091-2015 is 0.8mm to 5.0mm.
Galvanized steel pipes for special purposes. For example, the standard wall thickness of DN15-DN40 galvanized steel pipe is 0.8mm and the reinforced wall thickness is 1.0mm; the standard wall thickness of DN50-DN150 galvanized steel pipe is 1.2mm and the reinforced wall thickness is 1.5mm; the standard wall thickness of DN200-DN400 galvanized steel pipe is 1.2mm. The standard wall thickness of steel pipes is 1.5mm, and the reinforced wall thickness is 2.0mm; the standard wall thickness of DN450-DN630 galvanized steel pipes is 2.0mm, and the reinforced wall thickness is 2.5mm; the standard wall thickness of DN700-DN800 galvanized steel pipes is 2.5mm. The reinforced wall thickness is 3.0mm.
In addition, when the wall thickness of galvanized steel pipe is greater than 1.5mm, the average thickness is not less than 45μm; when 1.5-3mm, the average thickness is not less than 55μm; when 3-6mm, the average thickness is not less than 70μm; when the wall thickness is greater than 6mm, The average thickness is not less than 85μm.
