ASTM/ASME SA179 SA192 Cold Rolled GI Steel Pipe for Boiler and Heat
Exchanger
1. ASTM A179 cold drawn seamless pipe manufacturers with thick
dense zinc layer covered in the cold drawn seamless tube surface,
it can avoid cold drawn seamless tube matrix and any contact with
the corrosion solution to protect the steel matrix from corrosion.
In the general atmosphere, the surface of the zinc layer to form a
layer of thin and dense zinc oxide surface, it is difficult to
dissolve in water, so the steel matrix plays a protective role. If
zinc oxide and other components of the atmosphere produce insoluble
zinc salt, the anti-corrosion effect is more desirable.
2. With iron - zinc alloy layer, combined with dense, and with the
unique anti-corrosion in the marine atmosphere and atmospheric
atmosphere.
3. ASTM A179 cold drawn seamless pipe with a strong wear resistance
due to the combination of solid, zinc - iron miscible.
4. Since zinc has good ductility, its alloy layer and steel base
attached to a solid, so hot-rolled parts can be cold, rolling,
drawing, bending and other molding without damage to the coating.
5. Hot-dip galvanized structural steel pipe, the equivalent of an
annealing treatment, can effectively improve the mechanical
properties of steel matrix to eliminate the steel forming welding
stress, is conducive to the steel structure for turning.
6. The surface of cold drawn seamless pipe after hot galvanized is
bright and beautiful.
7. Pure zinc layer is the most hot galvanized layer of galvanized
layer, its nature is basically close to pure zinc, with ductility,
so it is full of flexibility.
Chemistry Composition:
| C, % | Mn, % | P, % | S, % |
| 0.06-0.18 | 0.27-0.63 | 0.035 max | 0.035 max |
Mechanical Properties:
| Tensile Strength, MPa | Yield Strength, MPa | Elongation, % | Hardness, HRB |
| 325 min | 180 min | 35 min | 72 max |
Outside Diameter & Tolerance
| Outside Diameter, mm | Tolerance, mm |
| 3.2≤OD<25.4 | ±0.10 |
| 25.4≤OD≤38.1 | ±0.15 |
| 38.1 | ±0.20 |
| 50.8≤OD<63.5 | ±0.25 |
| 63.5≤OD<76.2 | ±0.30 |
| 76.2 | ±0.38 |
