Galvanized Steel Pipe
1.Two commen types of galvanized steel pipe
1) hot dip galvanized steel pipe
Hot-dip galvanizing (HDG), as referenced in the process of dipping fabricated steel into a kettle or vat of molten zinc. While the steel is in the kettle, the iron metallurgically reacts with the molten zinc to form a tightly-bonded alloy coating that provides superior corrosion protection to the steel.
2) pre galvanized (GI) steel pipe
The pre-galvanized welded steel pipe refers to welded tube which undergoes decreasing, rust removal, phosphorization, and drying processes before galvanization.The treatments before galvanization allow the product to be conveniently plated with a zinc coating and also ensure uniform coating thickness, strong coating adhesion, and improved corrosion resistance
2.Specification of galvanized steel pipe
| DN | INCH | OD(mm) | WT(mm) | DN | INCH | OD(mm) | WT(mm) |
| 15 | 1/2'' | 21.3 | 1.1-2.75 | 400 | 16'' | 406.4 | 5.0-12 |
| 20 | 3/4'' | 26 | 1.1-3.0 | 450 | 18'' | 457.2 | 5.0-12 |
| 25 | 1'' | 33.4 | 1.1-3.25 | 500 | 20'' | 508 | 6-14 |
| 32 | 1 1/4'' | 42.2 | 1.5-3.5 | 550 | 22'' | 558.8 | 6-14 |
| 40 | 1 1/2'' | 48.3 | 1.5-3.75 | 600 | 24'' | 609.6 | 6-14 |
| 50 | 2'' | 60.3 | 1.5-4.0 | 650 | 26'' | 660.4 | 6-14 |
| 65 | 2 1/2'' | 76 | 2.0-4.0 | 700 | 28'' | 711.2 | 6-14 |
| 80 | 3'' | 89 | 2.0-4.0 | 750 | 30'' | 762 | 6-14 |
| 90 | 3 1/2'' | 108 | 2.0-4.5 | 800 | 32'' | 812.8 | 8-20 |
| 100 | 4'' | 114 | 2.0-4.75 | 850 | 34'' | 863.6 | 8-20 |
| 125 | 5'' | 140 | 2.0-4.75 | 900 | 36'' | 914.4 | 8-20 |
| 150 | 6'' | 165 | 2.0-4.75 | 1000 | 40'' | 1016 | 8-20 |
| 200 | 8'' | 219 | 3.0-6.25 | 1050 | 42'' | 1066.8 | 8-20 |
| 250 | 10'' | 273 | 3.0-6.25 | 1100 | 44'' | 1117.6 | 8-20 |
| 300 | 12'' | 325 | 3.0-10 | 1150 | 46'' | 1168.4 | 8-20 |
| 350 | 14'' | 355 | 3.0-10 | 1200 | 48'' | 1219.2 | 8-20 |
