GI Seamless Pipe, also known as Galvanized Iron Seamless Pipe, is a crucial component in plumbing, construction, water supply, and industrial fluid systems. With its corrosion-resistant zinc coating and seamless design (no weld), this pipe offers the durability of mild steel and the protection of galvanization—making it one of the most sought-after piping solutions in India.
At Udhhyog, we supply and export premium-quality GI Seamless Pipes that comply with IS and ASTM standards. Whether your requirement is for water lines, fire safety, structural support, or industrial supply chains, our GI seamless pipe range covers all sizes and thicknesses.
What is a GI Seamless Pipe?
A GI Seamless Pipe is a mild steel pipe that is galvanized (coated with a layer of zinc) and manufactured without any welding joint. The zinc layer provides long-lasting protection against rust, while the seamless construction ensures high pressure-bearing capacity without leakage.
Keyphrase in introduction used: GI Seamless Pipe is widely used for high-pressure and corrosion-resistant applications across industries.
GI Seamless Pipe vs GI Welded Pipe
| Feature | GI Seamless Pipe | GI Welded Pipe |
|---|---|---|
| Weld Presence | No weld – seamless | Has a longitudinal weld |
| Pressure Resistance | High | Moderate |
| Corrosion Resistance | Very high (galvanized + seamless) | High (only galvanized) |
| Cost | Higher due to process | Lower |
| Application | Industrial, Firefighting, Oil & Gas | Plumbing, Fencing, Irrigation |
Use GI Seamless Pipes for critical fluid lines and GI Welded Pipes for non-pressurized or light applications.
Manufacturing Process
- Billet Selection – High-grade mild steel
- Piercing – Solid billet pierced into hollow tube
- Elongation & Sizing – Pipes stretched and shaped
- Galvanization – Pipes are dipped in molten zinc (hot-dip method)
- Testing – Pressure, leakage, corrosion tests conducted
Outbound link: Learn more about Galvanizing from ISI Guide
Sizes and Dimensions
| NB Size | OD (mm) | SCH 40 Thickness (mm) | Zinc Coating |
|---|---|---|---|
| ½” | 21.3 | 2.8 | 40–60 µm |
| 1” | 33.4 | 3.4 | 40–60 µm |
| 2” | 60.3 | 4.5 | 50–80 µm |
| 4” | 114.3 | 6.0 | 50–100 µm |
| 6” | 168.3 | 7.1 | 80–100 µm |
Download full chart at: https://udhhyog.com/rfq
Price List – 2025
Prices may vary based on wall thickness, zinc coating, and schedule.
| Pipe Size | Grade | Price (₹/Meter) |
|---|---|---|
| ½” | IS 1239 GI Seamless | ₹110 – ₹140 |
| 1″ | IS 1239 GI Seamless | ₹160 – ₹200 |
| 2″ | IS 1239 GI Seamless | ₹270 – ₹350 |
| 4″ | IS 3589 GI Seamless | ₹600 – ₹750 |
| 6″ | IS 3589 GI Seamless | ₹900 – ₹1100 |
Bulk orders available at factory rates. Contact Udhhyog
Applications and Industrial Uses
GI Seamless Pipes are used in:
- Water distribution pipelines
- Firefighting networks
- Oil & Gas pipelines
- Structural piping in buildings
- Compressed air and vacuum lines
- Boiler feed and drainage
- Fencing and mechanical framework
Internal link: Explore Udhhyog Valves & Pipe Accessories
IS & ASTM Standards for GI Seamless Pipe
| Standard | Description |
|---|---|
| IS 1239 | GI Pipes for water, gas & sewage (Light/Med/Heavy) |
| IS 3589 | Seamless steel pipe for water & gas (larger dia) |
| ASTM A53 | Black and galvanized seamless & welded pipes |
| ASTM A106 | Seamless carbon steel pipe for high temperature |
Outbound link: ASTM A53 Pipe Standard
Zinc Coating Types & Benefits
- Hot-Dip Galvanized (HDG) – Most durable
- Electro-Galvanized – For light-duty applications
- Pre-Galvanized Strip – Cheaper alternative
Benefits:
- Prevents rust for up to 25 years
- Suitable for outdoor & underground use
- No maintenance required
- Keeps water pure in supply systems
Pipe Fittings & Flanges
To support a complete system, Udhhyog also supplies:
- GI Elbows (45° / 90°)
- GI Tees, Reducers, Couplers
- GI Threaded Flanges
- GI Pipe Clamps and Supports
Internal Link: GI Pipe Fittings at Udhhyog
Udhhyog – Trusted GI Seamless Pipe Supplier in India
At Udhhyog, we offer:
- Factory-direct GI Seamless Pipes
- ISI-marked products
- Custom sizes & cutting
- Fast delivery & bulk discounts
- Pan-India & Export Support
Call: 9311120784
RFQ: https://udhhyog.com/rfq
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FAQs About GI Seamless Pipe
Q1. Is GI seamless pipe better than welded GI pipe?
Yes, seamless pipes are stronger, leak-proof, and ideal for pressure systems.
Q2. What is the standard zinc coating thickness?
40–100 microns based on application and IS standards.
Q3. Are GI seamless pipes good for drinking water?
Yes, if zinc coating is certified for potable use.
Q4. Do seamless GI pipes corrode?
The zinc layer protects for decades. Minimal maintenance needed.
Q5. Where can I buy GI seamless pipe in bulk?
At Udhhyog – PAN India delivery and RFQ support available.