Hot-Dip Galvanized Line Pipe
01. Product Overview
Hot-Dip Galvanized Line Pipe is an ERW round steel pipe manufactured from steel strip and galvanized after forming and welding.
During hot-dip galvanizing, the completed steel pipe is immersed in molten zinc to form a protective coating on its surface. The zinc layer helps protect the steel substrate from corrosion caused by exposure to the surrounding environment.
Unlike pre-galvanized pipe, which is formed from steel strip coated with zinc before tube manufacturing, hot-dip galvanized pipe receives its zinc coating after the pipe has been formed and welded.
The product range includes different outside diameters, wall thicknesses and steel grades, with additional processing and packaging options available for different purchasing specifications.
02. Product Specifications & Selection
Hot-dip galvanized ERW round steel pipes are available in a range of dimensions, material grades and coating specifications.
Main Product Specifications
| Product Type | Hot-Dip Galvanized Round Steel Pipe |
|---|---|
| Manufacturing Process | ERW (Electric Resistance Welded) |
| Outside Diameter | 1/2"–24" (21.3–600 mm) |
| Common Outside Diameters | 21.3 mm, 33.4 mm, 42.3 mm, 48.3 mm, 114.3 mm |
| Wall Thickness | 0.8–25 mm |
| Zinc Coating Thickness | 35–200 μm |
| Steel Grades | Q235, Q345, S235JR, S275JR, STK400, STK500, S355JR, GR.B-D |
| Surface Treatment Options | Hot-Dip Galvanized, Pre-Galvanized, Electro-Galvanized, Black, Painted |
| Additional Processing | Threaded, Engraved, Socket |
| Packaging | Loose packing for large-diameter pipes; steel-strapped bundles for small-diameter pipes; woven fabric packaging |
Actual dimensional, material and coating combinations depend on the selected specifications and order requirements. Surface treatments and additional processing options are product range choices, not standard features of every pipe.
Standards References
The product range lists the following standards and specifications:
- EN 10219
- JIS G3444:2004
- ASTM A53 SCH40/80/STD
- BS EN 10255-2004
The required standard and edition should be stated in the purchasing specification so the selected pipe configuration can be matched to the project requirement.
Selecting the Right Specification
Start with the outside diameter and wall thickness required by the pipeline design. These dimensions define the pipe configuration and need to match the intended connections and installation requirements.
Select the steel grade according to the material specification and operating conditions. For projects requiring a designated standard, identify that requirement when requesting a quotation.
The zinc coating thickness should also be included in the order specification. The listed range is 35–200 μm.
03. Product Features & Applications
Galvanizing After Pipe Manufacturing
Hot-dip galvanizing is carried out after the ERW pipe has been formed and welded. The completed round steel pipe is immersed in molten zinc to receive its protective surface coating.
This differs from pre-galvanizing, where the steel strip is coated with zinc before tube forming. The distinction is relevant when the purchasing specification calls for galvanizing after pipe manufacturing.
ERW Round Steel Pipe
The pipe is formed from steel strip into a round tubular section, with the longitudinal seam joined through electric resistance welding.
Its round tubular profile is used in water distribution, industrial piping and general pipeline installations. Outside diameter and wall thickness can be selected according to the project specification.
Application Areas
Hot-dip galvanized round steel pipes are used in applications where the selected dimensions, material grade and zinc coating requirements match the intended service conditions.
- Water Distribution: Pipework for applicable water transportation and distribution systems.
- Industrial Piping: General industrial fluid transportation using suitable pipe specifications.
- Construction: Round steel pipe applications in building and infrastructure projects.
- General Pipeline Installations: Systems requiring steel pipe with a galvanized surface.
For gas transportation, pressure-bearing systems and other regulated applications, the required product standard, material grade, wall thickness and pipeline design specification should determine the pipe selection.
04. Customization & Supply Options
Dimensional, surface treatment, processing and packaging options can be specified according to the order requirements.
Pipe Dimensions and Materials
- Outside Diameter: 1/2"–24" (21.3–600 mm), with customized diameters available upon request.
- Wall Thickness: 0.8–25 mm.
- Steel Grades: Q235, Q345, S235JR, S275JR, STK400, STK500, S355JR and GR.B-D.
Surface Treatment
Listed surface treatment options include:
- Hot-dip galvanized
- Pre-galvanized
- Electro-galvanized
- Black
- Painted
The listed zinc coating thickness range for hot-dip galvanized pipe is 35–200 μm.
Additional Pipe Processing
Available processing options listed for the product range include:
- Threaded
- Engraved
- Socket
Include the required processing details with the pipe dimensions when requesting a quotation.
Export Packaging
Packaging arrangements include:
- Large-diameter pipes: Loose packing.
- Small-diameter pipes: Steel-strapped bundles.
- Additional protection: Woven fabric packaging.
- Other arrangements: Packaging according to customer requirements.
05. Company & Purchasing Support
Shanxi Midas Industrial Co., Ltd. was established in 2012 and is based in Shanxi, China. Its product portfolio covers several steel material and steel pipe categories:
- Steel Coils
- Steel Plates
- Steel Strips
- H-Beams
- Steel Pipe Products
The company introduction reports service to customers in 109 countries and regions.
Order Support
Company-level purchasing support covers:
- Pre-sales communication about product specifications and technical requirements.
- Quotations based on requested dimensions and order details.
- Confirmation of product specifications and order information before production.
- Updates on production and inspection progress.
- After-sales communication regarding returns, replacements and claims under applicable order arrangements.
06. FAQ & RFQ
What is the difference between hot-dip galvanized pipe and pre-galvanized pipe?
Hot-dip galvanized pipe receives its zinc coating after the pipe has been formed and welded. Pre-galvanized pipe is manufactured from steel strip that has already been galvanized before tube forming. The difference is the sequence of manufacturing and galvanizing.
What outside diameters are available?
The listed hot-dip galvanized round steel pipe range is 1/2"–24" (21.3–600 mm). Customized outside diameters are also available upon request.
What zinc coating thickness can you supply?
The listed zinc coating thickness range is 35–200 μm. Include your required coating thickness in the purchasing specification.
Which steel grades are available?
Listed steel grade options include Q235, Q345, S235JR, S275JR, STK400, STK500, S355JR and GR.B-D. Specify the grade required for your project when requesting a quotation.
Can you supply threaded or socket pipes?
Threaded, engraved and socket configurations are listed as additional processing options. Include the required pipe dimensions and processing details in your inquiry.
How are the pipes packaged?
Large-diameter pipes can be supplied in loose packing, while small-diameter pipes can be packed in steel-strapped bundles. Woven fabric packaging and other customer-requested arrangements are also available.
Request a Quotation
To receive a quotation for Hot-Dip Galvanized Line Pipe, send us your available purchasing details:
- Outside diameter and wall thickness
- Required steel grade or product standard
- Zinc coating thickness
- Order quantity
- Required threading, engraving or socket processing
- Packaging requirements
- Destination market or delivery port
You can also send an existing product specification or drawing for reference.
Contact Shanxi Midas Industrial Co., Ltd. with your Hot-Dip Galvanized Line Pipe specifications and purchasing requirements for a quotation.
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