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Tube Mill Machine MG219

Tube Mill Machine – MG219 | High-Frequency ERW Welded Pipe Production Line The MG219 tube mill machine is a high-frequency ERW (Electric Resistance Welding) welded pipe production line engineered to manufacture round, square, and rectangular steel pipes from strip coil. Covering a tube...

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Description

Tube Mill Machine – MG219 | High-Frequency ERW Welded Pipe Production Line

The MG219 tube mill machine is a high-frequency ERW (Electric Resistance Welding) welded pipe production line engineered to manufacture round, square, and rectangular steel pipes from strip coil. Covering a tube outer diameter range of Φ89–Φ219 mm and a wall thickness of 2.5–8.0 mm, it is a proven solution for manufacturers serving the structural steel, construction, mechanical tubing, and oil & gas fluid conveyance industries.

Designed as a complete turnkey pipe manufacturing equipment line - from uncoiler to computer-controlled cut-to-length saw - the MG219 delivers stable milling speeds of 12–35 m/min. Its solid-state high-frequency welder, spiral accumulator, 5-roll leveling machine, and CO₂ automatic butt-welder combine high output with consistent weld quality, making it a cost-effective tube mill machine for medium-to-large pipe producers who need to manufacture heavier-wall structural and API-grade welded tubes.

Compared with smaller models in the same series, the MG219 tube mill machine is built around a heavier frame, a more powerful HF welder, and a spiral accumulator that stores a longer strip buffer - enabling the line to run thicker, wider strip at sustained speed. Whether you are producing structural tubes for high-rise buildings, mechanical tubing for heavy machinery, or ERW line pipe for fluid conveyance, the MG219 offers the rigidity, throughput, and weld integrity required by modern welded pipe production lines.

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Key Specifications of the MG219 Tube Mill Machine

The table below summarizes the main technical parameters of the MG219 tube mill machine. Rolling speed is adjustable within the suitable range of pipe diameter and wall thickness, allowing the line to balance output and weld quality for different product specifications.

Parameter	Specification
Model	MG219
Tube O.D. (round pipe)	Φ89 – Φ219 mm
Tube size (square / rectangular)	70×70 – 170×170 mm
Wall thickness (round pipe)	2.5 – 8.0 mm
Wall thickness (shaped pipe)	2.5 – 6.0 mm
Milling speed	12 – 35 m/min
Strip width	320 – 690 mm
Strip thickness	3.0 – 9.0 mm
Steel coil I.D.	Φ500 – Φ600 mm
Steel coil O.D. (max.)	Φ1600 mm
Maximum coil weight	10 T
Cutting length	5 – 8 m
Applicable material	Low-carbon steel, low-alloy steel (σs ≤ 345 MPa, σb ≤ 610 MPa)
Line configuration	Uncoiler → Leveling → Butt-welding → Accumulator → Forming → Welding → Sizing → Cutting → Packing

For materials outside this range - such as high-strength steel, galvanized strip, or stainless grades - please consult our engineering team to confirm the roll tooling and welder configuration.

Main Components of the MG219 Tube Mill Machine

The MG219 tube mill machine is composed of ten integrated stations, each engineered for continuous, high-yield production of heavier-wall welded pipe. Together they form a complete welded tube mill that converts steel strip into finished, bundled pipe in a single automated flow. The complete line configuration is summarized below.

No.	Component Name	Qty	Function
1	Double-taper uncoiler (with coil car)	1 set	Strip coil loading & payoff
2	Shovel head device	1 set	Strip head straightening
3	5-roll leveling machine	1 set	Strip flattening & leveling
4	Butt-welder (CO₂ automatic)	1 set	Coil joining for continuous run
5	Spiral accumulator	1 set	Continuous strip storage buffer
6	Forming, welding & sizing unit	1 set	Includes rough straightening & cooling
7	Solid-state HF welder	1 set	High-frequency ERW welding
8	Computer-controlled flying cutting saw	1 set	Cut-to-length (computer / milling saw)
9	Automatic packing machine	1 set	Pipe sacking and bundling
10	Electrical control system	1 set	PLC line synchronization

Key Advantages of the MG219 Tube Mill Machine

The MG219 is built to deliver a low total cost of ownership for medium-to-large welded pipe producers. The advantages below explain why this tube mill machine is widely chosen over competing ERW pipe mill lines in the same diameter range.

Heavier-wall capacity: With a wall thickness range of 2.5–8.0 mm, the MG219 can produce structural and API-grade welded pipe that smaller tube mill machines cannot handle, opening up higher-margin markets.

Continuous, non-stop production: The spiral accumulator plus CO₂ automatic butt-welder allow the tube mill machine to keep running at full speed during coil changeover, maximizing daily output.

Solid-state HF welding: Higher efficiency, lower power consumption, and more stable weld quality than vacuum-tube welders - reducing operating cost per ton of finished pipe.

Precise length control: The computer-controlled flying cutting saw delivers ±6 mm cutting tolerance, meeting the requirements of structural and API pipe standards.

Heavy-duty frame: The line is engineered for 10-ton coils and thicker strip, ensuring rigidity and long service life under 24/7 production loads.

Turnkey, single-source supply: From uncoiler to packing machine, every station is supplied and integrated by MaxMach, simplifying installation, training, and after-sales support.

Production Process Flow of the Tube Mill Machine

The MG219 tube mill machine converts steel strip into finished welded pipe through a continuous, automated process:

Steel coil loading → Uncoiling

Strip feeding → Shovel head → Flattening → 5-roll leveling

Shearing & CO₂ butt-welding (coil joining)

Spiral accumulation (continuous strip buffer)

Roll forming → Open round tube

HF induction welding → Weld seam formation

Weld bead scarfing (internal & external) → Weld planishing → Water cooling

Sizing & straightening → Final dimension control

Computer-controlled tracking cut-to-length (5–8 m)

Automatic packing → Bundled pipe ready for shipping

Applications of the MG219 Tube Mill Machine

Pipes produced by the MG219 tube mill machine are widely used across multiple industries, thanks to its larger diameter and heavier wall thickness range:

Structural steel for construction: columns, beams, and load-bearing tubes for high-rise buildings, stadiums, and industrial plants

Construction and scaffolding: heavy-duty scaffolding tubes, formwork supports, and temporary structures

Oil, gas & fluid conveyance: ERW line pipe for water, gas, and petroleum distribution (API 5L grade)

Mechanical and machinery tubing: hydraulic cylinder sleeves, drive shafts, machine frames, and heavy equipment components

Infrastructure: highway guardrail posts, street light poles, signal poles, and traffic sign structures

Automotive and commercial vehicles: chassis frames, axle housings, and structural reinforcements

General-purpose welded steel pipe: for distribution, piling, and medium-pressure applications

Frequently Asked Questions (FAQ)

Q1: What is a tube mill machine?

A tube mill machine is an industrial production line that converts flat steel strip (coil) into welded steel tubes through roll forming and high-frequency electric resistance welding (ERW). A complete tube mill machine runs as a continuous, automated flow - from uncoiler, accumulator, forming and welding, sizing, and cut-to-length saw, to automatic packing - and can produce round, square, rectangular, and special shape pipes in a wide range of diameters and wall thicknesses.

Q2: What types of tube mill machines are available?

The main types of tube mill machine include ERW tube mills (the most common, using high-frequency electric resistance welding), direct forming tube mill lines (which produce both round and shaped pipes by adjusting roller spacing instead of changing rolls), direct square tube mill lines (specialized for square and rectangular pipe), and large-diameter steel pipe mills for API and structural applications. MaxMach supplies all of these configurations, with model series covering tube diameters from Φ8 mm up to Φ530 mm.

Q3: What materials can a tube mill machine process?

A modern tube mill machine can process a wide range of strip materials, including hot-rolled carbon steel, cold-rolled carbon steel, galvanized steel, high-strength low-alloy (HSLA) steel, high-strength steel, and stainless steel. The exact material range depends on the roll tooling design, HF welder power, and line configuration. For special grades such as high-strength steel or stainless, the roll pass design and welder parameters must be matched to the material to ensure consistent weld quality.

Q4: What is the difference between an ERW tube mill and a seamless pipe?

An ERW tube mill produces welded pipe by forming flat steel strip into a tube and welding the seam with high-frequency electric resistance welding, while seamless pipe is produced from a solid steel billet pierced and drawn into a hollow tube with no weld seam. ERW welded pipe is more cost-effective, has tighter wall-thickness control, and is sufficient for the vast majority of furniture, construction, automotive, and mechanical tubing applications. Seamless pipe is reserved for high-pressure, high-temperature, or critical-service applications where a weld seam is not acceptable.

Q5: What is the difference between direct forming and traditional roll forming in a tube mill machine?

In a traditional roll forming tube mill machine, each tube size requires a dedicated set of rollers, and changing the product specification means stopping the line to swap rollers. In a direct forming tube mill machine (also called a flexible forming line), the same set of rollers are adjusted in spacing and position rather than replaced, so the same set of rollers can produce multiple sizes without changing rollers. Direct forming technology reduces roller inventory, shortens changeover time, and save labor.

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