What is the difference between MS and GI ?

What is GI (Galvanized Iron)?

Definition of MS (Mild Steel)

Mild Steel (MS) is a low-carbon steel known for its high strength, ductility, and weldability. Unlike GI, MS does not have a protective zinc coating, making it more susceptible to rust when exposed to moisture. However, due to its affordability and versatility, MS remains one of the most widely used materials in industrial applications.

Mild steel (MS) is the most widely used and cost-effective type of steel, making it a staple in countless applications. With a carbon content of no more than 0.29%, it is highly weldable, strong, and can be magnetized, allowing it to be used in a wide range of industries. While it is durable, its tendency to rust means it requires protective coatings such as paint, oil, or grease to prevent corrosion. Despite its versatility, mild steel lacks the structural strength needed for heavy load-bearing applications like girders or large beams. However, it remains an essential material in everyday products, including automobile chassis, motorcycle frames, and cookware, due to its affordability and ease of fabrication.

Difference between galvanized iron pipe (GI) and mild steel pipe (MS):

Property	Galvanized Iron (GI)	Mild Steel (MS)
Composition	Low-carbon steel coated with zinc	Pure low-carbon steel with no coating
Corrosion Resistance	High (due to zinc coating)	Low (prone to rust unless treated)
Strength	Moderate	Higher than GI
Weldability	More difficult due to zinc coating	Excellent
Cost	Higher due to galvanization	More affordable
Durability	Long-lasting in outdoor conditions	Requires coating to prevent rust
Applications	Construction, water pipes, electrical, automotive	Heavy structures, industrial machinery, pipelines

1. Material Properties
GI pipes have a zinc coating that enhances corrosion resistance but can wear off over time, especially in harsh environments. MS pipes, made from low-carbon steel, offer high strength and durability but require protective coatings to prevent rust.

2. Manufacturing Process
GI pipes undergo hot-dip or electro-galvanization, which adds a zinc layer but may slightly alter pipe dimensions. MS pipes are produced by rolling and drawing steel billets, ensuring uniformity and strength.

3. Cost
Due to the galvanization process, GI pipes are more expensive, while MS pipes are more cost-effective due to simpler manufacturing.

4. Applications
GI pipes are commonly used in water supply, fire protection, and aviation due to their rust resistance. MS pipes, with superior strength, are widely used in construction, oil and gas, and heavy industries.

GI Pipe vs. MS Pipe: What’s the Difference?

GI pipe full form stands for Galvanized Iron Pipe, which is coated with zinc for corrosion resistance. MS pipe full form refers to Mild Steel Pipe, which lacks a protective coating and requires maintenance to prevent rust.

Feature	GI Pipe	MS Pipe
Corrosion Resistance	High (zinc coating)	Low (requires coating)
Durability	Long-lasting in moisture-prone areas	Durable but prone to rust
Cost	More expensive	Cheaper than GI pipe
Uses	Water transport, fencing, structural	Gas, oil pipelines, structural applications

Conclusion

Choosing between GI (Galvanized Iron) and MS (Mild Steel) depends on your project’s specific needs:

GI offers superior corrosion resistance and durability, ideal for water systems and outdoor use.

MS provides high strength and affordability, perfect for structural and indoor applications.

Both materials have unique advantages, and understanding their differences ensures optimal performance and cost-efficiency. For projects requiring long-term reliability in harsh environments, GI pipes are the better choice. For budget-friendly, high-strength needs, MS pipes are unbeatable.

Need help selecting the right material? Contact us today for expert advice!