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Home / Products / Direct To Square Welded Pipe Production Line / 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line
  • 200x200 ERW Square And Rectangular Tube Mill Line

200x200 ERW Square And Rectangular Tube Mill Line

 Product Introduction
During the process of forming square and rectangular pipes, the roll utilizes a combined roll with a fragment structure, and the roll sheet is filled with the roll sleeve. One set of rolls can cover the welded pipes of the product specifications, and the roll-sharing rate reaches 100%. The roll adopts a segmented structure, and the local contact between the roll and the steel strip in the deformation area is not uniform, thus reducing the contact area and correspondingly reducing the friction between the strip steel and the roll. As a result, the roll wastage is less. The energy consumption of the machine forming is reduced correspondingly, and the strip width can be saved by about 4%. According to the needs of users, the machine can be designed to produce profiles, square tubes, rectangular tubes, and round tubes, multi-functional combination equipment, to achieve a multi-purpose machine.

PREV: 400x400 Directly forming Square and Rectangular tube mill by Share Roller Next: 60x60 ERW Square Tube Mill
Direct to the square machine parameters (roll sharing)
Direct-to-square machine model Square (rectangular) pipe specifications Wall thickness (mm) The raw material of the square e-pipe Milling speed (m/min)
200X200 □ 80x80-200x200 3.0-10.0 Q355B 10-40
□ 80x100-150x250
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Why Us
Yangzhou SINOFORM Machinery Co., Ltd.
The company is located in the Industrial Concentration Zone of Dayi Town, Yangzhou City, Jiangsu Province. It was registered in January 2010 and is a professional manufacturer of welded pipe units and their supporting rolling mill molds. With more than ten years of history, it is a well-known enterprise in the welded pipe industry.

As a professional China 200x200 ERW Square And Rectangular Tube Mill Line suppliers and 200x200 ERW Square And Rectangular Tube Mill Line company, Our company has advanced processing equipment that is ahead of domestic peers. We specialize in the production and sales of high-frequency welded pipe equipment, laser welded pipe equipment, cold-formed steel equipment, rolling mill molds, etc. We are a professional manufacturer that integrates scientific research, technology, production, sales, and service.

Certificate Of Honor
  • MACHINERY DIRECTIVE ATTESTATION OF CONFORMITY
  • Jiangsu quality and integrity AAA grade brand enterprise
  • 2024 Jiangsu Gazelle Enterprises
  • Yangzhou Municipal Enterprise Technology Centre
  • Certificate
  • High-tech Enterprise Certificate
  • Jiangsu Province Enterprise Postgraduate Workstation
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Industry knowledge

The 200x200 ERW square and rectangular tube mill line represents an essential industrial production system designed for continuous high-frequency electric resistance welding of structural steel hollow sections. Engineered for efficiency and structural accuracy, this machinery processes hot-rolled or cold-rolled steel coils into precise square and rectangular cross-sections.

1. Engineering Overview and Core Operational Mechanics

An Electric Resistance Welding (ERW) tube mill line operates through continuous roll forming and high-frequency induction heating. Strip steel uncoils, passes through flattening rollers, and undergoes incremental cold forming through a series of breakdown and fin-pass stands. The open seam is joined using high-frequency welding current (typically 300 kHz to 500 kHz), which concentrates energy along the strip edges without requiring filler metal.

After internal and external bead removal, the welded tube enters cooling and sizing stages. Sizing stands re-shape the round mother tube into 200x200 mm square profiles or corresponding rectangular dimensions (such as 250x150 mm or 300x100 mm) through precision roll tooling. Finally, an automated flying cold saw or friction saw cuts the tube into required commercial lengths.

Key Technical Parameters of the 200x200 ERW Tube Line

  • Maximum Profile Dimensions: 200x200 mm (Square), 250x150 mm / 300x100 mm (Rectangular)
  • Wall Thickness Range: 3.0 mm to 12.0 mm (depending on material grade)
  • Raw Material Specifications: Carbon steel strips (Q235, Q355, S235, S355, ASTM A500)
  • Welding Power System: Solid-state high-frequency welder (600 kW - 800 kW)
  • Line Speed Capacity: 15 m/min to 45 m/min

2. Forming Technologies: Direct Square vs. Round-to-Square

In the production of 200x200 ERW hollow sections, two main forming methodologies are utilized industry-wide. Selecting the appropriate process depends on production requirements, wall thickness variations, and tooling investment.

Process Feature Round-to-Square Forming Method Direct-to-Square Forming Method
Forming Sequence Formed into round tube, welded, then sized into square profile. Formed directly into square cross-section prior to high-frequency welding.
Tooling Investment Requires specific roll sets for each round diameter and final square profile. Uses shared combined tooling, reducing roll changeover costs.
Corner Stress Distribution Uniform deformation with lower residual stress along side walls. Higher corner concentration, requiring precise roll design for heavy walls.
Edge Thickness Uniformity High dimensional stability across varying wall thicknesses. Optimal for medium-to-thin wall production efficiency.

3. Industrial Applications and Structural Demands

200x200 ERW square and rectangular tubes serve as critical load-bearing structural members across modern construction and heavy industrial manufacturing. Key application areas include:

  • Building Frameworks: Column and truss elements in industrial plants, warehouses, and commercial steel-structure buildings.
  • Infrastructure Engineering: Highway guardrails, bridge supports, railway station canopy frames, and tower structures.
  • Machinery Manufacturing: Heavy equipment chassis, agricultural machinery frames, and crane booms requiring high torsional resistance.
  • Energy Sector: Solar tracking structure supports, wind turbine access frames, and rack systems.

4. Manufacturing Capability and Quality Integration at Yangzhou SINOFORM Machinery

Located in the Industrial Concentration Zone of Dayi Town, Yangzhou City, Jiangsu Province, Yangzhou SINOFORM Machinery Co., Ltd. has operated as an established manufacturer of welded pipe production lines and supporting rolling mill molds since its registration in January 2010. The company integrates scientific research, mechanical engineering, production, sales, and technical service into a unified manufacturing framework.

With a workforce of over 160 employees, Yangzhou SINOFORM Machinery maintains an annual output capacity of 160 to 200 welded pipe production lines. The company utilizes advanced machining equipment to maintain precise tolerances during the manufacturing of high-frequency welded pipe equipment, laser welded pipe units, cold-formed steel lines, and specialized rolling mill molds. Operations adhere to ISO9001 quality certification standards and CE certification requirements, ensuring compliance with international manufacturing norms.

5. Frequently Asked Questions (FAQ)

Q1: What steel grades can be processed on a 200x200 ERW tube mill line?

The line processes standard carbon steel coils ranging from yield strength Q195 up to high-strength Q355/S355 grades. Adjustments in motor power and roll forming design are required when processing higher tensile strength materials to account for springback.

Q2: How is seam quality verified during continuous production?

Inline quality control includes high-frequency weld power monitoring, online ultrasonic testing (UT) for internal defect detection, eddy current inspection, and periodic flattening and bending tests on cut samples.

Q3: What is the main maintenance requirement for rolling mill molds in heavy-duty tube lines?

Rolling mill molds require periodic inspection for surface wear and micro-cracking, proper lubrication management, and precise alignment checkups during setup to prevent asymmetrical profile deformation and premature mold degradation.