Hot Dipped Galvanized Steel Pipe Manufacturer & Supplier – Sino East Steel Group
Sino East Steel Group is a professional galvanized steel pipe manufacturer and supplier headquartered in Tianjin, China. Since 2008, we have exported hot dipped and pre-galvanized steel pipes to more than 80 countries across the Middle East, Southeast Asia, Africa, Europe and the Americas. As a factory-direct supplier, we eliminate middleman costs and deliver certified galvanized pipes at competitive wholesale prices, with MOQ starting from 5 tons and a standard 15-30 day delivery window.
Every galvanized pipe we produce is manufactured in our own 50,000 m2 plant, supported by 6 production lines and an annual output exceeding 100,000 tons. Whether you are a distributor, contractor, engineering procurement company or government project buyer, our team offers one-stop sourcing: size selection, standard compliance, surface finish, packing and sea freight.
Why Choose Sino East Steel Group as Your Galvanized Pipe Supplier?
International buyers evaluate a supplier on four factors: product quality, certification, price stability and delivery reliability. The following sections explain how Sino East Steel Group performs on each of them, and why thousands of global buyers choose us as their long-term galvanized pipe manufacturer and supplier.
1. Factory-Direct Manufacturing, No Middlemen
We are not a trading company. Our factory directly controls the entire process from steel strip purchasing, forming, welding and hot-dip galvanizing to final inspection. This vertical integration allows us to offer prices that are typically 5-10% lower than trading companies while maintaining consistent quality, because there is no broker margin in the supply chain.
2. Full International Standards Compliance
Our galvanized pipes are manufactured and tested according to internationally recognized standards, including ASTM A53, BS 1387, EN 10255, ISO 65 and GB/T 3091. Each batch is accompanied by a mill test certificate (MTC) with chemical composition and mechanical property data, allowing customs clearance and third-party inspection to proceed smoothly.
3. Stable Quality with Multi-Step Inspection
Quality is built through process control, not just final inspection. Our quality control system covers five key checkpoints: incoming raw material verification, welding seam inspection, galvanizing bath parameter monitoring, coating thickness measurement and final dimensional checks. We also accept third-party inspection by SGS, BV or Intertek before shipment, at the buyer’s request.
4. Flexible Supply for All Project Scales
From a 5-ton trial order for local distributors to 5,000-ton government infrastructure projects, our production scheduling and warehouse stock (normally 8,000-10,000 tons of finished pipes) allow us to support urgent orders and staggered deliveries across multiple shipments.
Galvanized Steel Pipe Product Range
Hot Dipped Galvanized Steel Pipe (HDG)
Hot dipped galvanized pipes are produced by immersing formed carbon steel pipes into a bath of molten zinc at approximately 450 C. The resulting zinc-iron alloy layer, typically 60-100 um thick, provides 20-50 years of corrosion protection, making HDG pipes the preferred choice for outdoor, marine and high-humidity applications such as scaffolding, fence posts, water transmission and structural supports.
Pre-Galvanized Steel Pipe
Pre-galvanized pipes are made from steel strips that are galvanized before forming and welding. This process produces a smooth, uniform coating and precise dimensional tolerances, ideal for indoor applications such as greenhouses, furniture, cable trays and light structural work.
Galvanized Steel Square & Rectangular Pipe
In addition to round pipes, we supply galvanized square and rectangular hollow sections (SHS/RHS) widely used in steel structures, agricultural equipment, vehicle manufacturing and architectural frameworks. Standard sizes range from 15×15 mm to 400×400 mm, with wall thicknesses from 0.5 mm to 20.0 mm.
Threaded & Coupled (T&C) Galvanized Pipes
For plumbing and fire protection systems, we supply threaded and coupled galvanized pipes with plain ends, beveled ends or screw threads, complete with couplings and sockets per BS 1387 or ASTM A53 requirements.
Galvanized Steel Pipe Specifications
| Parameter | Available Range |
|---|---|
| Outer Diameter | 1/2″ to 12″ (15 mm – 300 mm) |
| Wall Thickness | 1.5 mm – 12.0 mm |
| Standard Length | 6 m, 12 m (21 ft), or custom cut |
| Zinc Coating (HDG) | 60 – 100 um (average 65 um) |
| Zinc Coating (Pre-Galv.) | 20 – 60 um |
| Standards | ASTM A53, BS 1387, EN 10255, ISO 65, GB/T 3091 |
| Steel Grade | Q195, Q215, Q235, S235JR, A53 Gr.B |
| Pipe Ends | Plain End, Beveled End, Threaded & Coupled, Grooved |
| Surface Finish | Galvanized (bright / spangled / passivated) |
| Certification | ISO 9001, Mill Test Certificate, SGS/BV/Intertek inspection available |
Typical Weight Reference (SCH 40, 21 ft)
| Nominal Size | OD (mm) | Wall (mm) | Weight (lb/ft) |
|---|---|---|---|
| 1/2″ | 21.3 | 2.77 | 1.27 |
| 3/4″ | 26.7 | 2.87 | 1.69 |
| 1″ | 33.4 | 3.38 | 2.50 |
| 1-1/2″ | 48.3 | 3.68 | 3.63 |
| 2″ | 60.3 | 3.91 | 4.74 |
| 3″ | 88.9 | 5.49 | 8.92 |
| 4″ | 114.3 | 6.02 | 12.84 |
Typical Applications of Galvanized Steel Pipe
- Water supply & drainage – municipal water transmission, building plumbing, irrigation systems
- Scaffolding & construction – scaffolding tubes, handrails, structural supports, greenhouse frames
- Oil, gas & mining – low-pressure fluid transportation, ventilation pipes in mining operations
- Telecommunication & power – cable conduits, pole structures, solar panel mounting frames
- Agriculture – livestock fencing, irrigation sprinkler systems, farm machinery frames
- Road & traffic facilities – guardrails, street light poles, traffic sign supports
Why Galvanized Coating Matters
The zinc coating acts as both a physical barrier and a sacrificial anode. When the steel surface is scratched or cut, the surrounding zinc corrodes first, protecting the exposed steel from rust. This dual protection mechanism is why galvanized pipes maintain their integrity for decades in aggressive environments, whereas uncoated carbon steel pipes may fail within a few years.
Pricing, MOQ & Delivery
- Price Range: USD 500 – 900 per ton (FOB Tianjin), depending on size, wall thickness, zinc coating and order quantity. We provide a firm quotation within 24 hours.
- MOQ: 5 tons for stock sizes; 20 tons for customized specifications.
- Payment Terms: T/T (30% deposit, 70% before shipment) or L/C at sight for large orders.
- Delivery: 15-30 days after deposit, depending on quantity and destination port.
- Packing: Hexagonal bundles with steel straps, waterproof wrapping, or wooden crates for small diameters.
- Port of Loading: Tianjin Xingang Port, China (nearest port to our factory).
Buyer’s Guide: How to Choose a Reliable Galvanized Pipe Supplier
Choosing the right supplier is as important as choosing the right product. A reliable galvanized steel pipe supplier should be able to answer five questions clearly: First, what is the exact zinc coating thickness in microns? Second, which standard is the pipe actually manufactured and tested to, and can the supplier provide the mill test certificate? Third, what is the actual lead time from deposit to port of loading? Fourth, how are pipes packed to prevent damage during sea transport? And fifth, what happens if quality does not meet the contract specification after arrival? At Sino East Steel Group, we answer all five questions in writing within 24 hours of your inquiry.
How to Get a Quotation
To receive an accurate factory quotation within 24 hours, please provide: (1) outer diameter and wall thickness or schedule, (2) length and quantity, (3) standard or steel grade, (4) zinc coating requirement, and (5) destination port. Our export sales engineers will confirm availability, price and delivery schedule.
Frequently Asked Questions (FAQ)
Q1: What is the difference between hot dipped and pre-galvanized steel pipe?
Hot dipped galvanized pipe is immersed in molten zinc after forming, producing a thick coating (60-100 um) with excellent outdoor corrosion resistance. Pre-galvanized pipe is made from pre-coated steel strip, giving a thinner, smoother coating (20-60 um) for indoor and light-duty applications.
Q2: What is the MOQ for a trial order?
Our MOQ is 5 tons for standard stock sizes. Trial orders help buyers verify our quality and delivery before committing to larger volumes.
Q3: Can you provide third-party inspection?
Yes. We accept inspection by SGS, BV, Intertek or any agency designated by the buyer, either during production or before loading.
Q4: Do you support customized sizes and packing?
Yes. We can produce custom diameters, wall thicknesses, lengths, threading and packing per your project requirements.
Q5: What is your delivery time?
For stock sizes, delivery is 15-20 days after deposit. For customized production, delivery is 25-30 days.
Q6: Do you supply 2 inch x 12 ft galvanized pipe?
Yes. Our most popular length is the 2 inch x 12 ft galvanized pipe (60.3 mm OD, Schedule 40), produced to ASTM A53 / BS 1387 with hot-dip galvanized coating. See the 12 ft galvanized pipe specs and price for weight, wall thickness and 2026 pricing.
Q7: What is the price of 2 inch galvanized pipe in 20 ft lengths?
As of August 2026, a 20-foot 2 inch Schedule 40 galvanized pipe costs approximately USD 45-65 per piece FOB China (USD 750-950 per ton). See the 2 inch galvanized pipe 20 ft price guide for the full 2026 breakdown.
Where can I get a quote for 2 inch schedule 40 galvanized pipe?
See our dedicated 2 inch schedule 40 galvanized steel pipe prices page with factory pricing and specifications.
How do I choose the right galvanized pipe size for my project?
Read our guide to choosing the right galvanized pipe sizes covering diameter, schedule and application.
Need 2×4 galvanized rectangular tubing?
Check our galvanized 2×4 rectangular steel tubing price page with ASTM A500 specs and factory pricing.