Views: 0
If you are shopping for a line to make steel tube, the first problem is the word itself. Catalogues use pipe mills, tube mills and pipe making machines almost interchangeably, so you compare machines that do different jobs. We build ERW lines, and we start every enquiry by asking what shape you need to sell, not which model you saw on a website.
We wrote this to sort out the vocabulary before it costs you money. We classify a mill by the shape it forms and how often you change that shape, because those facts decide the tooling and the downtime you live with. Read it as a selection map: round, square, direct forming and quick change lines. Send us your product list and we will map it to a configuration.
Buyers use one word for a whole family of equipment, and that is where the confusion starts. We call them pipe mills, but the label covers a line that makes one round size and a line that switches between square sections every shift. Those are different machines with different tooling, footprint and changeover cost.
We classify a mill by two facts before we talk about a model number: the shape it forms and how often you change that shape. A buyer who asks without those two facts gets a generic quote, and a generic quote usually hides the tooling count and the number of roll sets you will actually buy.
Tell us the shapes, the size range and the changeover rhythm first. Then the model table becomes a shortlist, not a guess. We would rather ask three questions up front than swap a roll set after the line ships.
A round tube comes off a forming section where flat strip is bent progressively into a circle before H.F. welding. To make a square or rectangular tube, the welded round shell then passes through a sizing section with shaped rolls that press it into the final profile.
That extra step is where tooling cost lives. One roll set can cover a family of round diameters, but square corners need their own passes, and each corner radius and wall changes the roll geometry. We ask buyers to list every square and rectangular size they sell, because a line quoted for one square size will not quietly cover the rest.
See our square pipe mill page. Our published model table pairs round O.D ranges with square and rectangle ranges, for example ERW32 from 10 by 10 to 30 by 30 mm and ERW254 from 90 by 90 to 200 by 200 mm. Those rows are for reference and can be customised.
Forming route is the next fork. We publish three names for it: W Forming Technology, FFX, which stands for Flexible Forming Excellent, and Linear Cage Forming, also called Direct Forming Technology. In every case the forming section bends flat strip toward a tube before the H.F. welder closes the seam, and sizing and straightening follow after.
What changes between them is the roll arrangement and which shapes you reach without extra passes. W forming and FFX are the routes we list for a wide diameter range; direct forming is the route we list with our linear cage forming mills for square and rectangular profiles. We will not rank them in the abstract; the right one depends on wall thickness, diameter and how much of your output is square.
Read the engineering behind them on our linear cage forming page. Any unpublished wall or speed figure is to be confirmed in writing.
Changeover is the cost buyers forget. On a conventional line, switching a size means swapping a full set of forming rolls and re-setting the base level distance, and we cover roll changing in our technical articles. Fine for long runs, painful for small orders across many sizes.
Quick change product size is one of the equipment features we publish. A quick change roller tube mill is built so the roll sets can be exchanged with less downtime, which suits a job shop serving many small orders. We will not put a number on the changeover time; it is to be confirmed in writing against your size list.
The trade-off is honest. You pay for the extra tooling and the mechanism up front, and you get the benefit only if your order book actually changes size often. If you run two sizes all year, a standard line is the cheaper answer. Count your changeovers per month before you decide.
Some products push the configuration past a general purpose mill. Our published applications list electrical metallic tubing, water and gas pipes, scaffold pipes, furniture tubes, greenhouse tubes, photovoltaic support tubes, guardrail tubes, car tubes, tower base tubes, API oil pipes, drive shaft pipes and mechanical tubes.
EMT needs a light wall and a clean inside bead, so inner and external scarfing and zinc spraying matter. API oil pipes are a different buying decision, tied to the standard the buyer will specify against, such as API among the EN, ASTM, JIS, DIN, GB and API standards listed on our site; those are standards a line is specified against, not a certification we claim.
When the shape is not round or square at all, we point buyers to our special section tube mills. Special shaped tubes need dedicated rolls. Send the profile drawing instead of a size, and we will tell you whether it is a tooling job or a different line.
Here is our order for turning a product list into a shortlist. Write down every shape you sell, then the diameter or section range for each, then the wall range, then the material. Materials we publish include cold and hot rolled carbon steel, galvanized and aluminized steel, stainless steel, aluminium and copper.
Next, count how often you change size, and put the standards you must meet next to each product. Only then open a model table. ERW89 covers round tube from 32 to 89 mm and ERW508 from 165 to 508 mm. Those rows are for reference; unattached wall or speed cells are to be confirmed in writing.
Mill configuration by product shape and changeover frequency | |||
Configuration | Best product shape | Changeover pattern | Where it fits |
|---|---|---|---|
Standard round forming mill | Round tube in one size family | Rare changes with a full roll set swap | Long runs of water and gas pipe |
Round to square sizing conversion | Round and square from one line | Frequent round to square switch | Furniture, scaffold and structural tube |
Direct forming and linear cage mill | Square and rectangular profiles | Mostly square with few round sizes | Structural and photovoltaic support tube |
W forming or FFX line | Mixed diameters with thinner walls | Many diameter changes with shared rolls | General purpose mills with a wide size range |
Quick change roller mill | Many sizes on one line | Very frequent changeover | Job shops serving many small orders |
Special section line | Non round profiles and shaped tube | Rare changes with dedicated tooling | Car tubes, drive shaft and special shaped tubes |
Then score on changeover. Two pipe mills can both make your tube, but only one fits your order book. Pick on the shape mix and the changeover rhythm, not on the biggest diameter in the catalogue. That is how you avoid paying for capacity you never use.
A standard model is often the wrong answer. If your product list mixes round, square and special shaped tubes, or you change size every few days, one catalogue row will not describe the line you need. We would rather tell you that early than sell a mill that spends half its life being re-tooled.
Material and standard are the other triggers. Galvanized, aluminized or stainless strip changes the welding window, and a buyer specifying against API or a structural standard may need inspection points a basic line does not include as standard.
When we say a custom line is needed, we mean a revised drawing, a roll list and a fresh technical proposal, with any unpublished figure to be confirmed in writing. Most pipe mills that disappoint their owners were quoted from a size alone. Send the full product list and your changeover rhythm, and we will scope the line around the work it actually has to do.
A pipe mill is not one product, and a shortlist built from a brochure name will miss the point. Decide the shapes, size range, wall, material, standard and changeover rhythm first. Those inputs tell you whether you need a standard round line, a round to square conversion, a direct forming route, a quick change roller system or a special section mill.
We classify pipe mills by shape and changeover rhythm, because those two facts drive the tooling and the downtime you will live with. We are Shijiazhuang FAITH Machinery Co., Ltd., and we publish our model ranges, forming routes and process steps for reference, with anything unpublished to be confirmed in writing. Send your product list and changeover count, and we will map it to a configuration instead of a catalogue row.
The word covers a family. At minimum it is the forming section, the H.F. welder and the sizing and straightening stands that turn strip into tube. A full line also adds uncoiling, strip joining and accumulating before forming, plus scarfing, cooling, eddy current testing, cutting and hydrostatic testing after. What you buy depends on the scope you agree, so ask for a written list.
Yes, but the tooling changes. The strip is first formed and welded round, then a sizing section with shaped rolls presses the shell into a square or rectangle. One roll set covers a family of round sizes, while square corners need their own passes. List every square size you sell, because a line quoted for one will not cover the others.
They are three forming routes we publish. W Forming Technology and FFX, short for Flexible Forming Excellent, are routes we list for a wide diameter range; Linear Cage Forming, also called Direct Forming, is the route we list with our linear cage forming mills for square and rectangular profiles. The right choice depends on wall thickness, diameter and how much of your output is square.
It pays off when your order book changes size often. A conventional line needs a full roll set swap and a re-set of the base level distance for each size, which is fine for long runs but painful for many small orders. We do not publish a changeover time; it is to be confirmed in writing against your size list. Count your monthly changeovers first.
Our site lists EN, ASTM, JIS, DIN, GB and API under tube standards, and buyers ask for a line that can be specified against the one their market needs. API oil pipes and structural tube are different buying decisions, so tell us the standard with the product. We describe them as standards a line is specified against, not a certification we hold.
English
