| Processing Way | Cylinder Barrel ID (mm) | Max Length (mtr) | Straightness (mm/mtr) | ID Tolerance | Wall Thickness Tolerance (mm) | ID Roughness (μm) |
| Cold Drawn | 40-320 | 12 | 0.2-0.5 | H8-H10 | ±5% | 0.8-1.6 |
| Cold Rolled | 12-100 | 12 | 0.2-0.5 | H8-H10 | ±5% | 0.8-1.2 |
| Cold Drawn+Honed | 40-500 | 8 | 0.2-0.3 | H7-H9 | ±5% | 0.2-0.8 |
| Cold Drawn-SRB | 40-400 | 7 | 0.2-0.3 | H8-H9 | ± 5% | 0.2-0.4 |
| Deepth Drilling-Honed | 320-1100 | 8 | 0.2-0.3 | H7-H9 | ±8% | 0.2-0.8 |
| Deepth Drilling-SRB | 320-600 | 7 | 0.2-0.3 | H8-H9 | ±8% | 0.2-0.4 |
Product Application:
1. Fence, greenhouse, door pipe,greenhouse
2. Low pressure liquid, water, gas, oil, line pipe
3. For both indoor and outdoor the building construction
4. Widely used in scaffolding construction which is much cheaper
and convenient.
Overview of galvanized and hot-dip galvanized pipes
Galvanized steel pipe, commonly known as cold galvanized pipe, is
galvanized only on the surface of the steel pipe, and the inner
cavity of the steel pipe is not galvanized.
Hot-dip galvanized steel pipes are generally made of hot-dip
galvanized processing technology, and the inner and surface of the
steel pipes are covered with zinc layers.
The difference between galvanized pipe and hot-dip galvanized pipe:
1. The processing technology is different, one is organic chemical
solution, the other is physical solution; the hot-dip galvanized
galvanized layer is firm and not easy to fall off.
2. The hot-dip galvanized coating is thick, so the anti-corrosion
ability is strong. The galvanized (electroplating process) coating
is well-proportioned and the process performance is good. The
thickness of the coating is generally between 1 μm and more than
ten μm.
3. Hot-dip galvanizing is an organic chemical solution, which
belongs to electrochemical corrosion. Galvanizing is a physical
solution. Just brush a layer of zinc on the surface, and there is
no galvanized inside at all, so the zinc layer is easy to fall off.
Hot-dip galvanizing is used in the construction of construction
projects.
4. The hot-dip galvanized steel pipe is made by reflecting the
molten metal material and the iron base material to form an
aluminum alloy layer, and then the base material and the coating
layer are closely combined.
