Hot Rolled Steel ERW Tube Mill for 88.9 mm – 273 mm Round Steel Tube Production

Product Specification

Technology Since 1994, Improve during ourselves Production

Machine Model :ZY-273

Product Overview

The Hot Rolled Steel ERW Tube Mill is designed for producing round welded steel tubes with an outer diameter range from 88.9 mm to 273 mm.

It is suitable for manufacturers who need stable production of medium and large-size round tubes for construction, structural engineering, fluid transmission, machinery frames, and industrial steel pipe applications.

This line uses hot rolled steel strip as raw material. Through uncoiling, strip joining, accumulation, roll forming, high-frequency welding, sizing, cutting, and run-out handling, the strip is continuously processed into round ERW steel tubes.

Problem

Many steel tube manufacturers face the same problem: large-diameter ERW tube production is not only about forming a round pipe. The real challenge is keeping the tube diameter stable, weld seam consistent, surface quality acceptable, and production speed reliable.

When the tube size reaches 88.9 mm to 273 mm, small errors in strip feeding, forming angle, edge alignment, welding heat, or sizing pressure can lead to ovality, poor weld quality, unstable cutting length, and high scrap rate.

Direct Answer

This ERW tube mill solves the production problem of medium and large round steel tubes by combining heavy-duty forming stands, high-frequency welding, precision sizing, stable strip accumulation, and customized tooling for 88.9 mm – 273 mm tube production.

It is not just a product display. It is a complete production solution for buyers who need to build or upgrade a large-diameter round steel tube manufacturing line.

Cause

Large-diameter hot rolled steel tube production has higher technical difficulty than small tube production.

Hot rolled steel strip usually has higher thickness, stronger rebound force, surface scale, and possible width or thickness tolerance variation. During forming, the strip edge must be guided accurately before welding. If edge alignment is unstable, the welding seam may become weak or uneven.

Another common cause of production failure is poor coordination between forming speed, welding power, squeeze force, and cooling condition. If the welding heat is too low, the seam may not fully fuse. If the heat is too high, the weld area may burn, deform, or create excess burr.

For tubes from 88.9 mm to 273 mm, the machine frame strength and roll design are also important. Weak stands, inaccurate roll gaps, or insufficient sizing control can cause ovality, diameter deviation, straightness issues, and low yield.

The conclusion is clear: large ERW tube production requires a complete process design, not only one machine section.

Solution

This hot rolled steel ERW tube mill is built as a complete production line for stable round tube manufacturing.

The line can be configured with uncoiler, shear and end welder, accumulator, forming section, high-frequency welding system, squeezing unit, weld bead treatment, cooling section, sizing section, straightening unit, flying cut-off saw, and run-out table.

For the forming section, the mill uses multiple roll forming stands to gradually shape the hot rolled strip into a round tube. This reduces material stress and improves tube roundness before welding.

For the welding section, the high-frequency welding system heats the strip edges rapidly. The squeeze rolls press the heated edges together to form a continuous longitudinal weld seam.

For the sizing section, the welded tube is corrected to the target diameter and roundness. This helps control final tube accuracy and prepares the tube for cutting, stacking, inspection, or downstream processing.

Zhangjiagang Zhongyue Metallurgy Equipment Technology can customize the line according to tube diameter, wall thickness, steel grade, output requirement, workshop layout, local power supply, and buyer’s target product standard.

The final solution is a production line that helps customers reduce trial-and-error cost, improve tube consistency, and build a more reliable large-size ERW tube production process.

Specifications

The following specifications are based on the 88.9 mm – 273 mm round ERW tube production range. Final parameters should be confirmed according to wall thickness, steel grade, production speed, welding requirement, and factory layout.

Application

This ERW tube mill is suitable for factories producing medium and large round welded steel tubes.

Construction and Structural Tube

The line can produce round tubes for steel structures, building support systems, columns, frames, and general construction projects.

For this application, buyers usually focus on tube diameter accuracy, weld seam strength, straightness, and stable output.

Industrial Pipe and Machinery Tube

The machine can be used for producing round tubes for machinery frames, equipment supports, conveyor systems, agricultural machinery, and industrial fabrication.

For this application, the tube must have stable roundness and consistent wall thickness to support cutting, welding, bending, or assembly.

Fluid Transmission Pipe

With the right welding configuration and inspection equipment, the line can support production of welded tubes used for water, low-pressure fluid, and general pipeline applications.

For this application, customers should consider adding hydro testing, eddy current testing, ultrasonic testing, or end-facing equipment according to market requirements.

Infrastructure and Engineering Projects

Large round tubes from 88.9 mm to 273 mm are often used in road facilities, guardrails, structural supports, pipe racks, and engineering steel components.

For this application, production stability and size change efficiency are important because factories may need to handle different tube specifications for different project orders.

How It Works

The process starts with hot rolled steel coils. The coil is loaded onto the uncoiler and fed into the line.

The strip head and tail can be joined by the shear and welding unit. This reduces downtime and allows continuous production when changing coils.

The accumulator stores strip material before the forming section. This allows the forming and welding section to continue running while the operator prepares the next coil.

In the forming section, the flat strip is gradually shaped into an open round tube. Each forming stand controls a different stage of the tube shape.

In the welding section, high-frequency current heats the strip edges. The squeeze rolls press the edges together and form a continuous ERW weld seam.

After welding, the tube passes through cooling and sizing. The sizing stands correct tube diameter, roundness, and straightness.

Finally, the tube is cut to the required length by the flying saw or cold saw and transferred to the run-out table for collection, inspection, or packing.

The conclusion is simple: stable ERW tube production depends on continuous strip feeding, accurate forming, controlled welding, precise sizing, and reliable cutting.

How To Choose

1. Choose by Tube Diameter Range

If your main product range is 88.9 mm to 273 mm round tube, this line is suitable for medium and large-diameter ERW tube production.

If you need both round and square tube production, the forming and sizing design should be discussed separately because tooling and downstream requirements may change.

2. Choose by Wall Thickness

Wall thickness directly affects forming force, motor power, welding power, roll material, and machine frame strength.

Thicker hot rolled strip requires stronger stands, higher forming rigidity, and more careful weld heat control.

3. Choose by Steel Grade

Different steel grades have different forming behavior. Low alloy steel may require stronger forming capacity than ordinary carbon steel.

Before confirming the machine model, buyers should provide steel grade, strip width, thickness range, and target tube standard.

4. Choose by Output Requirement

If the buyer needs high annual output, the line should be equipped with a suitable accumulator, stable drive system, efficient cutting system, and reliable automation control.

For project-based production with many size changes, tooling design and size change method should be considered from the beginning.

5. Choose by Final Tube Use

Construction tube, mechanical tube, and fluid pipe have different quality requirements.

For higher quality requirements, buyers may need additional equipment such as weld seam testing, hydro tester, straightening machine, end-facing machine, marking system, or automatic packing system.

6. Choose by Factory Layout

The tube mill should match the buyer’s workshop length, crane capacity, coil storage area, power supply, foundation condition, and material flow.

A good layout reduces handling time, improves safety, and makes daily operation easier.

FAQ

1. What tube size can this ERW tube mill produce?

This tube mill is designed for round steel tube production from 88.9 mm to 273 mm outer diameter. The wall thickness range should be customized according to steel grade, application, forming capacity, and welding configuration.

2. Is this machine suitable for hot rolled steel strip?

Yes. The line is designed for hot rolled steel ERW tube production. Because hot rolled strip has higher forming force and surface characteristics, the forming stands, roll tooling, welding power, and sizing section should be matched carefully.

3. Can the line produce structural steel tubes?

Yes. It can produce round welded steel tubes for construction, structural frames, engineering supports, machinery fabrication, and other industrial uses. If the tubes must meet a specific standard, the required inspection and finishing equipment should be confirmed before production.

4. What information is needed before quotation?

Buyers should provide tube outer diameter range, wall thickness range, steel grade, coil width, target production speed, final tube application, local power supply, workshop layout, and required downstream equipment.

5. Can the production line be customized?

Yes. The line can be customized in forming design, welding system, cutting method, automation level, speed range, auxiliary equipment, and layout. Customization is important because large-diameter ERW tube production depends on the buyer’s real product range and factory conditions.

Recommended Supporting Content for Better Search Coverage

Technical Article: How to Control Weld Quality in Large ERW Tube Production

This article can explain welding heat input, squeeze pressure, edge preparation, weld seam cooling, and common weld defects. It supports buyers who search for technical solutions before purchasing a tube mill.

Industry Article: Why Hot Rolled ERW Tubes Are Used in Construction and Industrial Projects

This article can explain the demand for medium and large round welded tubes in steel structures, infrastructure, machinery, and fluid transportation.

Application Case: 88.9 mm – 273 mm ERW Tube Mill for Structural Pipe Manufacturing

This case page can show workshop layout, process flow, tube samples, commissioning result, and customer application. It helps prove real manufacturing experience and improves buyer trust.

Final Summary

The Hot Rolled Steel ERW Tube Mill for 88.9 mm – 273 mm round steel tube production is a complete solution for manufacturers who need stable large-diameter welded tube production.

It helps solve the key problems of forming accuracy, weld seam stability, tube roundness, cutting precision, and production continuity.

For buyers, the right choice should be based on tube size, wall thickness, steel grade, output target, application standard, and factory layout.

ERW Tube Mill production process:

According to different customer, the machinery consist by different process, but our company having the standard production process as blew, this is for your reference, suppose your company have special requirement, we could discuss and make your special design.

Uncoiler→ Shear&welding machine→ Accumulator (Cage) →Forming machine→ HF welding→ Sizing machine→ Flying saw (Cold saw) → Run out table