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 UnitDescription
UncoilerHydraulic expansion, prevents coil looseness, supports 7T/10T coil weight
Shear & Butt WelderAutomatic positioning for quick coil changeover
AccumulatorHorizontal loop type to ensure continuous strip feeding
Forming MillDouble-row shaft structure, servo adjustment, supports round/FFX/square
High Frequency WelderSolid-state control, 200–600kHz options, adjustable power output
Water Cooling SystemInternal and external pipe cooling to maintain shape
Sizing UnitPrecision shaping and straightening, adaptable to square/rectangular tubes
Flying SawHot or cold saw optional, servo synchronization control
Run-Out TableManual 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

 

      • 8inch pipe milling saw cutoff
      • 8inch round pipe
  • landing type horizontal accumulator
  • 219 steel pipe making machine
 
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


  1. 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

Looking for a complete understanding of ERW TUBE MILL technology? Read our Ultimate Guide to ERW TUBE MILL.

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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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