8 Inch ERW Tube Mill

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8inch 219mm ERW Tube Mill from China Manufacturer

This 8-inch straight seam welded pipe equipment adopts modular design, heavy-duty steel structure, and CNC adjustment system to ensure stability and precision when producing large thick-walled steel pipes. The overall structure is welded and assembled with optimized profiles, with good seismic resistance and load-bearing capacity. All key parts are precision-machined with high-strength alloy steel and are equipped with linear guides or ball screw drives to achieve high-response, low-error adjustment.

Product Details

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Product Details

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Product Description

The diameter of 6 inches 168mm is already a medium-sized pipe in the straight seam welded pipe. This kind of pipe has many usage, such as solar brackets piles, ground piles, construction, etc.

This equipment can produce pipes from the smallest 2 inches 50.8mm to the largest 6 inches 168mm. A set of equipment includes all pipes. Different pipe diameters require different molds.Customers can choose from a variety of technical styles for this set of equipment, including conventional round to square, direct square for square and rectangular pipes, or FFX flexible molding technology. No matter which option you choose, we can provide a perfect solution.

List of Equipment Supply

Equipment Unit	Description
Uncoiler	Hydraulic expansion, prevents coil looseness, supports 7T/10T coil weight
Shear & Butt Welder	Automatic positioning for quick coil changeover
Accumulator	Horizontal loop type to ensure continuous strip feeding
Forming Mill	Double-row shaft structure, servo adjustment, supports round/FFX/square
High Frequency Welder	Solid-state control, 200–600kHz options, adjustable power output
Water Cooling System	Internal and external pipe cooling to maintain shape
Sizing Unit	Precision shaping and straightening, adaptable to square/rectangular tubes
Flying Saw	Hot or cold saw optional, servo synchronization control
Run-Out Table	Manual or automatic unloading, with optional stacker

2. BASIC DESIGN DATA

Design of the proposed line is based on following specification:

Raw Material Specification

Specification Item	Value/Range
Tube Diameter Range	Φ89mm – Φ219mm
Wall Thickness Range	2.0mm – 8.0mm
Strip Width Range	280mm – 700mm
Material Strength	200 – 600 MPa
Line Speed	15 – 40 m/min
Cutting Accuracy	±1.5mm
Forming Method	Round-to-Round / FFX / Round-to-Square
Control System	Siemens PLC + HMI
Total Power (approx.)	400 – 600 kW (based on configuration)
Operation Mode	Manual / Automatic switchable

Tube Applications

Industry Sector	Typical Uses
Steel Construction	Columns, brackets, structural frames
Oil & Gas Transmission	Gas lines, medium-pressure pipelines
Municipal Engineering	Firefighting pipes, water drainage
Renewable Energy	Solar support posts, ground mounting piles
Automotive & Machinery	Chassis tubes, machine arms

Smart Control Features

Module	Function Description
Auto Speed Control	Ensures synchronization between forming & welding
Flying Saw Sync	Dynamic cutting with minimal length deviation
Parameter Memory	Quick roller setup switching
Fault Alarm System	Displays real-time errors, triggers auto-stop
OPC Integration	Supports connection with MES/Industry 4.0 systems

Common Issues & Solutions

Issue	Cause & Solution
Strip Deviation	Adjust tension, inspect guide rolls and loop control
Weld Seam Cracks	Increase HF power, fine-tune water cooling
Burr at Cut Edge	Check saw sharpness and feeding synchronization
Diameter Deviation	Adjust sizing roll gap and forming pressure
Unstable Tube Shape	Check frame rigidity, roll alignment, and strip tension

The Flow of the Production Line

{Steel Tape}→Coil car→ Uncoiler →Peeler and hold down roll→Flattener→ Strip-head Cutter and welder→Spiral accumulator→Forming section（Flattening unit +Main driving unit +Forming unit +Guide unit +squeeze roller）+ De-burr frame →→Cooling unit →→ Sizing unit and straightener →→Cutoff saw →→ Run-out table →→Straingtener machine →→Chamfer machine →→Hydro tester machine →→automatic package machine

tube making process

Packaging & Shipment Details

Item	Packaging Description
Forming Rollers	Wooden crates with anti-rust oil
Forming Machine	Frame strapped and covered with dustproof cloth
Control Cabinet	Shockproof wooden box with wiring & manuals
Shipping Method	Modular packing, container loading or land freight
Documents Provided	Quality certificate, packing list, wiring diagram

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8inch ERW tube Mill FAQs

What should I do if the steel strip deviates frequently?

Check whether the unwinding tension is balanced and confirm that the guide mechanism and the loop tension control device are operating normally.

Is the weld prone to bursting when the wall thickness is large?

Increase the induction power and control the cooling intensity at the same time to avoid sudden cooling and heating in the welding area.

Is the flying saw cutting uneven or burred?

Check the wear of the saw blade, the cutting speed setting, and the straightness of the guide rail system.

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