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Quick Answer: The difference between GI and MS mainly comes down to zinc coating and corrosion protection. GI (Galvanized Iron) refers to iron or steel that has been coated with zinc, and modern GI pipe is usually galvanized steel pipe. The zinc layer helps protect the base metal from corrosion. MS (Mild Steel) is low-carbon steel with no zinc coating, so it usually needs paint, oil, or other protection depending on the service environment.
GI pipe is often made from mild steel, so the main difference is usually whether the steel is galvanized, not that the two are completely different base metals.
Coating: GI has a zinc layer; MS has none
Corrosion resistance: GI has built-in zinc protection; MS needs added protection
Cost & weldability: MS is usually cheaper and easier to weld; GI usually costs more and needs extra care when welding
In short, when comparing GI vs MS, GI is chosen when long-term corrosion resistance matters more than cost, while MS is chosen when strength, weldability, and affordability are the priority. This same trade-off carries directly into piping products — which is why the choice between GI Pipe vs MS Pipe follows the same logic explained below.
GI vs MS: Key Differences at a Glance
| Feature | GI (Galvanized Iron) | MS (Mild Steel) |
| Full Name | Galvanized Iron | Mild Steel |
| Base Material | Iron or steel; GI pipe is usually mild steel | Low-carbon steel |
| Zinc Coating | Yes, usually hot-dip; electroplating is less common | None |
| Surface Finish | Shiny to dull gray | Plain metallic, often painted |
| Corrosion Resistance | Good to excellent while the coating is intact; depends on environment | Poor without added protection |
| Strength | Similar to the base steel; zinc adds protection, not strength | Depends on steel grade; good strength and ductility |
| Weldability | More difficult; zinc coating needs extra precautions | Generally excellent |
| Maintenance | Lower in suitable environments | Painting, oiling, or coating usually needed |
| Cost | Usually higher | Usually lower |
These material differences also affect steel pipe selection, so the next section compares GI pipe and MS pipe in terms of corrosion protection, welding, maintenance, and typical applications.
Read a full guide: Difference Between GI and MS: GI vs MS Pipe Comparison
Article source: https://article-realm.com/article/Business/85399-GI-vs-MS-Pipe-Comparison.html
URL
https://www.permanentsteel.com/Permanent Steel Manufacturing Co.,Ltd (PMC) have years of experience in manufacturing of carbon steel pipe, stainless steel tube, hollow section, pipe fittings.(Fluid Pipe/Boiler Tube/Fire Pipe/Line Pipe/Structure Tube) Please refer to: https://www.permanentsteel.com
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