Cold galvanizing is electrogalvanizing. The amount of galvanizing is very small, only 10-50g/m2, and its corrosion resistance is much worse than that of hot-dip galvanized pipes. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanizing (cold plating). Only small companies with small equipment and old equipment use electro-galvanized steel, of course, their prices are relatively cheaper. In newly built houses, the use of cold-galvanized steel pipes as water supply pipes is prohibited.
DN | NB | OD (mm) | WT (mm) |
15 | 1/2" | 19mm-21.3mm | 1.5mm-3.0mm |
20 | 3/4" | 25mm-26.9mm | 1.5mm-3.0mm |
25 | 1" | 32mm-33.7mm | 1.5mm-3.0mm |
32 | 1.1/4" | 40mm-42.4mm | 1.5mm-4.0mm |
40 | 1.1/2" | 47mm-48.3mm | 1.5mm-4.0mm |
50 | 2" | 58mm-60.3mm | 1.5mm-4.0mm |
65 | 2.1/2" | 73mm-76.1mm | 1.5mm-4.0mm |
80 | 3" | 87mm-88.9mm | 1.5mm-9.5mm |
100 | 4" | 113mm-114.3mm | 2.0mm-9.5mm |
125 | 5" | 140mm-141.3mm | 3.0mm-9.5mm |
150 | 6" | 165mm-168.3mm | 3.0mm-12.0mm |
200 | 8" | 219.1 | 3.2mm-12.0mm |
250 | 10" | 273 | 3.2mm-12.0mm |
300 | 12" | 323.9mm-325mm | 6.0mm-15mm |
350 | 14" | 355mm-355.6mm | 8.0mm-15mm |
400 | 16" | 406.4mm | 8.0mm-20mm |
450 | 18" | 457mm | 9.0mm-23mm |
500 | 20" | 508mm | 9.0mm-23mm |
550 | 22" | 558.8mm | 9.0mm-23mm |
600 | 24" | 609.6mm | 9.0mm-23mm |
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