How to Choose a Tube Mill Line for Round, Square, or Rectangular Pipe
A tube mill line should match your pipe profile, wall thickness, coil size, electrical supply, and target output. Our line produces round pipe from Φ20 to Φ76 mm, square pipe from 15×15 to 60×60 mm, and rectangular pipe from 10×20 to 40×80 mm in 0.9 to 3.0 mm low-carbon steel. Use these checks to prepare a practical specification for your order.
Finished pipe profile and dimensional range: round Φ20 to Φ76 mm, square 15×15 to 60×60 mm, rectangular 10×20 to 40×80 mm, with 0.9 to 3.0 mm wall thickness.
Input material and coil compatibility: low-carbon steel in cold-rolled or hot-rolled coil, strip width up to 240 mm, coil weight up to 3.0 tons, and coil diameter limits.
Production and plant fit: 20 to 100 m/min line speed, 6.0 m pipe length with ±3 mm tolerance, 500 kW installed capacity, cooling reservoirs, compressed air, and specified electrical supply.
Start with the pipe range
The first selection check is the finished profile and size. Our tube mill line produces round pipe from Φ20 to Φ76 mm, square pipe from 15×15 mm to 60×60 mm, and rectangular pipe from 10×20 mm to 40×80 mm. The supported pipe wall thickness is 0.9 to 3.0 mm.
This range suits a plant making several common structural and general-purpose pipe profiles on one line. If your order mix includes round, square, and rectangular products, confirm the required roll tooling and changeover arrangement with us for each profile. The line includes forming, high-frequency induction welding, cooling, sizing, straightening, flying sawing, and a run-out table, so the selection should be based on the complete product range rather than on the welding unit alone.
Match the input coil to the line
The material requirement is low-carbon steel in cold-rolled or hot-rolled coil. The stated material limits are tensile strength of up to 500 MPa and yield strength of up to 275 MPa. The strip thickness is 0.9 to 3.0 mm, with strip width up to 240 mm.
Coil handling also determines whether the line fits your incoming material. The hydraulic double-head uncoiler accepts coil outside diameter up to 1,600 mm, inside diameter from 480 to 550 mm, and maximum coil weight of 3.0 tons. The entry direction is right to left. Send your coil mill certificates, coil dimensions, and target pipe sizes when asking for a configuration review so we can check the feed against your actual stock.
Check the production target
The line speed is 20 to 100 m/min, and the stated annual output is 20,000 tons, depending on working days, daily operating hours, and the products being made. These figures give you a starting point for sizing the line around a product schedule. They do not replace a calculation using your planned profile mix, thickness, lengths, and operating calendar.
A spiral accumulator stores 400 to 800 meters of strip. Its entry filling speed is 180 m/min, while the exit line speed is up to 100 m/min in continuous operation. In a production run, this arrangement gives the forming section stored strip while the operator cuts and joins the next coil at the entry. You should therefore include coil change practice and accumulator capacity in your layout and production planning.
The line cuts pipe to a standard length of 6.0 m with a tolerance of ±3 mm in the basic specification. The computer-controlled flying saw cuts the moving tube, and the line includes an on-stream cutting stage. If your sales orders use different lengths, give us the length list before the saw configuration is finalized.
Review the line sections before ordering
The process begins with a double-head uncoiler, strip-head cutter and welder, and spiral accumulator. The forming section then includes flattening, the main drive, forming stands, guides, high-frequency induction welding, a squeeze roller, and a de-burring frame. Cooling, sizing, straightening, flying sawing, and run-out complete the downstream process.
The forming mill has seven horizontal driven stands and eight vertical side-roll stands. Its horizontal driven stand shafts are Φ80 mm and use 42CrMo material; the vertical side-roll stand shafts are Φ45 mm and use 40Cr material. These details matter when you compare a proposed line with your profile list because the forming and sizing section must support the shapes and wall thicknesses you intend to sell.
The welding system uses solid-state high-frequency edge heating and longitudinal seam welding. The line description also specifies a 250 kW MOSFET inverter for high-frequency welding, along with monitoring of high-frequency power and cooling-water temperature. Ask us to align the welding and cooling arrangement with your material thickness and production speed before approving the final equipment list.
Confirm utilities and plant conditions
The line requires AC 380 V ±10%, three phases, 50 Hz ±1.0% for dynamic power, and AC 220 V ±10%, single phase, 50 Hz ±1.0% for control power. Its installed electrical capacity is 500 kW.
Cooling requires one 30 m³ reservoir for the high-frequency equipment and one 30 m³ reservoir for circulating cooling water. Compressed air is specified at 0.4 MPa and 1.0 m³/h. These values should be checked against the utilities available at your plant before the equipment arrangement is fixed.
Picture the line in two operating situations. During coil preparation, the operator uses the double-head uncoiler and strip joining equipment while strip remains available through the accumulator. During pipe production, the moving tube passes through cooling, sizing, straightening, and the flying saw before reaching the run-out table. Measure the available floor length, service clearances, coil handling route, and electrical and water connection points against this sequence.
Buyer questions to settle
Can the line make both round and square pipe?
Yes. The line is specified for round pipe from Φ20 to Φ76 mm and square pipe from 15×15 to 60×60 mm. It also covers rectangular pipe from 10×20 to 40×80 mm. All three profile groups use a 0.9 to 3.0 mm thickness range. Give us the profile schedule so we can review the required forming and sizing arrangement.
What coil weight can the uncoiler handle?
The hydraulic double-head uncoiler handles coils up to 3.0 tons. It accepts coil outside diameter up to 1,600 mm and inside diameter from 480 to 550 mm, with strip width up to 240 mm. Compare these limits with the coils you actually purchase, including the maximum weight and outer diameter of each regular supply.
What pipe length does the line produce?
The basic pipe length is 6.0 m with a tolerance of ±3 mm. Cutting takes place on the moving line through a computer-controlled flying saw. Include the required finished lengths in your order discussion, especially if your product schedule includes lengths outside the basic 6.0 m specification.
What material is suitable for this tube mill line?
Low-carbon steel is suitable in cold-rolled and hot-rolled coil form. The stated material limits are tensile strength up to 500 MPa and yield strength up to 275 MPa, with strip thickness from 0.9 to 3.0 mm. Send the grades and thicknesses you plan to run so we can check them against the forming and welding arrangement.
Prepare the tube mill line specification
Choose this tube mill line when your product mix falls within the stated round, square, rectangular, thickness, coil, and low-carbon steel ranges. Before requesting a quotation, send your profile drawings, wall thicknesses, pipe lengths, annual volume, coil dimensions and weights, utility conditions, and available installation space. These details let us align the line with the work you need it to do.
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HEBEI YOWIN MACHINERY TECHNOLOGY CO.,LTD.
Hebei Yowin machinery Technology Co., Ltd is a professional manufacturer of roll forming machines .We was initially established in 1998. In 2018, we became a member of Yowin machinery and invested 8 factories, 6 machining centers and 1 steel structure company in China,We have the engineers with rich experience on design for roll forming machines, and also have a professional team on production and service.…
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