Galvanized Steel Pipe Making Machine | Unionindus

Φ10–Φ114mm

Pipe Diameter

0.5–4.5mm

Wall Thickness

10–100m/min

Forming Speed

HF Welding

Welding Method

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What is a galvanized steel pipe making machine?

A galvanized steel pipe making machine is an ERW tube mill configured to form pre-galvanized steel strip into a continuous tube, weld the longitudinal seam, size the pipe and cut it to the required length. Because welding can disturb the zinc layer around the seam, the production plan should include an appropriate seam treatment or coating restoration method when required by the finished-pipe specification.

Build a GI pipe line around the product you need to sell

Unionindus starts with your pipe diameter or section size, wall thickness, strip specification, cut length, tolerance and required output. The forming stands, welding power, sizing section, cut-off method and handling system are then matched as one line rather than selected as isolated machines.

Two production routes

Route 1 — Pre-galvanized strip to finished pipe: the tube mill forms and welds zinc-coated strip. A seam coating restoration module may be specified according to coating and appearance requirements.
Route 2 — Black ERW pipe followed by post-galvanizing: the tube mill produces uncoated carbon-steel pipe, and a separate downstream galvanizing plant applies the zinc coating. This is a different project scope.

A standard ERW tube mill does not automatically include a hot-dip galvanizing plant. Tell us which route you require so the quotation covers the correct equipment.

Technical Specifications

Key configuration ranges for a galvanized steel pipe making machine. Final specifications depend on your pipe schedule and production target.

Item	Specification
Material	Galvanized steel, carbon steel
Shape	Round, square, rectangular
Welding Method	High-frequency induction welding
Forming Speed	10–100 m/min (size dependent)
Pipe Diameter	Φ10–Φ114 mm (round); 10×10–90×90 mm (square)
Wall Thickness	0.5–4.5 mm

Model Specifications

Main Technical Parameters

Item	Specification
Strip Material	Hot rolled or cold rolled steel strip
Strip Width	30–360 mm
Strip Thickness	0.5–4.5 mm
Coil ID / OD	Φ508 mm / Φ1500 mm
Pipe Length	4–12 m
Total Power	Approx. 200–800 kW

Machine Line Composition

A typical galvanized tube mill line includes the following main equipment. The final layout can be adjusted to automation level and plant conditions.

Machine Unit	Function
Entry section	Coil car and uncoiler feed the steel strip safely into the line.
Shear and end welder	Joins successive coils for continuous production when required.
Accumulator	Stores strip so the forming mill can continue running during coil changes.
Forming mill	Progressively shapes the flat strip into a round open tube with controlled edge presentation.
High-frequency welding unit	Heats and forges the strip edges into a longitudinal ERW seam.
Bead and seam treatment	Manages the weld bead and can include coating restoration for pre-galvanized material.
Cooling, sizing and straightening	Stabilizes pipe geometry and brings it to the required finished section.
Flying cut-off	Cuts continuously produced pipe to the ordered length without stopping the mill.
Run-out and packing	Conveys, collects, stacks and optionally straps finished tubes.

Key Machine Features

Core advantages of this production line

Configured for GI strip

Line design considers coating protection, seam treatment and finished-pipe handling for pre-galvanized material.

Round, square and rectangular

Produce round pipe and, with suitable forming and sizing, square and rectangular tube.

Stable HF welding

High-frequency welding with controlled edge presentation for consistent longitudinal seams.

Matched line sections

Entry, forming, welding, sizing, cut-off and handling are selected as one production window.

Plant-ready proposal

Utilities, layout, tooling and automation scope can be included in the line recommendation.

Application Scenarios

Typical use cases for this equipment

Construction

Scaffolding, handrails, fencing, greenhouse frames and light structural fabrication.

Furniture

Tables, chairs, frames, gates and decorative tubular products.

Cable conduit and general fabrication

Conduit, partitions, equipment frames and general welded tube applications.

Industrial structures

Fabricated structures and equipment frames using round, square or rectangular GI tube.

Production Process

Typical pre-galvanized pipe production flow: Coil loading → Uncoiling → Strip end joining (optional) → Accumulation (optional) → Roll forming → High-frequency welding → External bead treatment → Seam coating restoration (when specified) → Cooling → Sizing and straightening → Flying cut-off → Run-out, inspection and stacking.

The final configuration depends on whether production must be continuous, how often sizes change, the required cut quality, the pipe acceptance standard and the desired level of automation.

Why Configuration Matters

Pre-galvanized strip requires more than simply feeding coated material through a conventional line. Roll surface condition, forming pressure, strip guidance, weld setup, bead treatment, seam protection and downstream handling all influence the appearance and integrity of the finished tube.

Roll tooling and pass design matched to pipe range and material
Stable strip tracking and edge presentation before welding
Welding and squeeze settings selected for the specified material window
Coating-conscious contact surfaces and finished-pipe handling
Inspection and testing modules selected to the required acceptance criteria

Buying Process

From pipe specification to line proposal:

Send your pipe size range, wall thickness, shape, material and zinc-coating information.
Confirm output, cut length, tolerance, applicable standard and automation expectations.
Review the proposed process flow, equipment list, utilities and preliminary layout.
Confirm tooling scope, inspection method, acceptance criteria, installation and training requirements.
Finalize the technical agreement before manufacturing begins.

Frequently Asked Questions

Can this machine produce galvanized pipe directly?+

Yes, when it is configured to process pre-galvanized steel strip. The strip is formed and ERW-welded into pipe. Because welding affects the zinc coating near the seam, the required seam protection or coating-restoration method should be confirmed from the finished-pipe specification.

Does the tube mill include a hot-dip galvanizing line?+

Not as a standard tube-mill function. A post-galvanized pipe project normally uses an ERW line to produce black steel pipe and a separate galvanizing plant downstream. Tell Unionindus if you require both scopes.

What pipe shapes can the line make?+

A configured line can produce round pipe and, with the appropriate forming and sizing arrangement, square and rectangular tube. The exact size range and changeover method depend on the selected mill and tooling.

Can one line run both galvanized and uncoated carbon-steel strip?+

It may be possible when both materials fall within the approved mechanical and welding range, but roll condition, welding setup, seam treatment and handling requirements must be reviewed before the line specification is fixed.

How do you reduce damage to the zinc coating?+

The line design should consider roll surface quality, pass design, forming pressure, strip guidance, weld-zone treatment and finished-pipe handling. The appropriate controls depend on the coating and appearance requirements.

What information is needed for a quotation?+

Provide the finished pipe drawing or size range, wall thickness, shape, strip grade, zinc-coating specification, cut length, tolerance, production target, applicable standard, plant power supply and desired automation level.

How is the correct machine model selected?+

Selection is based on the full production window rather than pipe diameter alone. Unionindus reviews the largest and smallest sections, wall thickness, material strength, speed target, weld requirement, cut-off method and downstream handling before proposing the line.

Need a Quote for Galvanized Steel Pipe Making Machine?

Send us your profile drawing, material thickness and target output. Our team will recommend a suitable configuration.