1. Main Differences
|
Comparison Items |
GI Pipe (Galvanized Iron Pipe) |
Galvanized steel pipe |
|
Substrate |
Mild steel (iron-based, low carbon content) |
Carbon steel or alloy steel (higher strength) |
|
strength |
Lower, suitable for low pressure environment |
Higher, can withstand greater pressure |
|
use |
Low-pressure water pipes, wire casings, agricultural irrigation |
Building structures, high-pressure pipelines, fire protection systems, oil and gas transportation |
|
Galvanizing process |
Hot dip galvanizing or electro galvanizing |
Hot-dip galvanizing mainly (thicker zinc layer) |
|
standard |
Traditional standards (such as IS 1239) |
Modern standards (such as ASTM A53, GB/T 3091) |
2. Advantages of galvanized steel pipes
(1) Higher strength and durability
Galvanized steel pipes are usually made of carbon steel or alloy steel, which have higher tensile strength and pressure bearing capacity than GI pipes (low carbon steel), and are suitable for scenarios such as high-pressure pipelines and building structure supports.
(2) Better corrosion resistance
Galvanized steel pipes are generally hot-dip galvanized (the zinc layer is thicker, 50-80μm), which are more rust-resistant than electro-galvanized GI pipes (zinc layer 5-15μm), and are suitable for outdoor, humid or highly corrosive environments (such as chemical plants and coastal areas).
(3) Wider application
Building structures: Galvanized steel pipes can be used for steel structure frames, scaffolding, etc., while GI pipes are generally not used for load-bearing structures due to their insufficient strength.
High-pressure fluid transportation: such as fire-fighting pipelines, industrial oil and gas transportation, galvanized steel pipes are more reliable.
Mechanical Manufacturing: Galvanized steel pipes can be used for mechanical parts, while GI pipes are mostly used for ordinary pipes.
(4) Longer service life
Due to the thicker zinc layer and stronger substrate, galvanized steel pipes generally last longer than GI pipes in harsh environments, reducing repair and replacement costs.
(5) Meet higher standards
Galvanized steel pipes usually comply with international standards such as ASTM, GB, EN, etc., and their quality is more controllable, while GI pipes may only comply with certain regional standards (such as Indian IS standards).
3. How to choose?
Choose galvanized steel pipe: high strength, high pressure resistance, and corrosion resistance are required (such as building structures, fire protection systems, and industrial pipelines).
Choose GI pipe: It is only used in low-cost demand scenarios such as low-pressure water pipes and wire protection.
Conclusion: Galvanized steel pipes are superior to GI pipes in strength, corrosion resistance, service life and application range, and are suitable for projects with higher requirements.
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Foshan Nanhai Guangqi Steel Industry Co., Ltd.