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![Plate Rolling](/images/uploads/3693329b-c561-4da0-a401-320c37e2b194/plate-rolling-service-steel-plate-rolled-into-cylinder-1920x1080.jpg)

Category

# Plate Rolling

Plate rolling for steel: minimum diameter, capacity and what a quote needs

Plate rolling forms flat steel plate into a curved shell — a cylinder, part of a cylinder, or a cone — by passing it through a set of powered rolls. This page covers what actually decides the outcome: how tight a diameter the machine can reach, the thickness and width it can handle together, why the plate ends need pre-bending, and what a provider needs from you before quoting.

## What drives the price

- Plate thickness
- Steel grade
- Plate width
- Target diameter or radius
- Quantity and repeat setups
- Whether the seam needs welding
- Whether the ends need pre-bending

## What to send for a quote

- Inside or outside diameter
- Plate thickness
- Shell length
- Grade or material number
- Whether the seam is to be welded
- Whether the ends need pre-bending
- Whether you need an inspection certificate

## Traceability and EN 10204 certificates

- 2.1
- 2.2
- 3.1
- 3.2

Standard for steel purchases: 3.1

The certificate belongs to the material, not to the forming operation. Rolling does not create an EN 10204 certificate — the real question is whether traceability survives forming into a shell, and how the piece is marked so that it does.

Standard-defined

Source: EN 10204 defines inspection-document types.

## How tight a diameter can be rolled

| Single pass, full roll width | 3- or 4-roll machine · Minimum diameter, as a multiple of the top roll diameter: 1.5 | Indicative |  |
|---|---|---|---|
| Multi-pass, narrower plate, softer material | 3- or 4-roll machine · Minimum diameter, as a multiple of the top roll diameter: 1.1 | Indicative |  |

Expressed against the machine's own top roll, not against plate thickness: the plate wraps around that roll, so the roll's diameter is the real limit on how tight a curve it can form.

## Thickness and width capacity

| Wide, thin plate | 50.8 mm · 3657.6 mm | Supplier-published |  |
|---|---|---|---|
| Narrow, thick plate | 304.8 mm · 914.4 mm | Supplier-published |  |
| General-purpose range | 2.66 mm · 12.7 mm · 2438.4 mm | Supplier-published |  |

Indicative figures. Confirm the achievable diameter, thickness and width with the provider for your grade, plate and machine.

## Flat ends and pre-bending

| Flat zone at each end, as a multiple of plate thickness | 1.5 – 3 |  |  |
|---|---|---|---|

Without pre-bending, each plate end keeps an un-rolled flat zone. Pre-bending the leading and trailing edges removes it.

Indicative

## Services

How tight a diameter can plate rolling achieve?

It is really a question about the machine, not the plate. A plate wraps around the top roll as it is formed, so the top roll's own diameter is the real limit — trade guidance for 3- and 4-roll machines puts a single-pass, full-width minimum at roughly 1.5 times the top roll diameter, and down to about 1.1 times for a narrower or softer plate rolled in multiple passes. A minimum expressed purely as a multiple of plate thickness is sometimes asked for, but no reliable industry figure exists for that framing — ask the provider what top roll diameter their machine carries and work from there.

What thickness and width can be rolled together?

Thickness and width trade off against each other on any given machine — a narrower plate can be rolled thicker, a wider plate has to be thinner. Two published examples show the range: one supplier rolls 2 in (50.8 mm) thick at 12 ft (3657.6 mm) wide, or 12 in (304.8 mm) thick at 3 ft (914.4 mm) wide, on the same equipment. Another publishes a general-purpose range of 12 GA to 1/2 in (about 2.7–12.7 mm) thickness up to 8 ft (2438.4 mm) wide. These are two named suppliers' own machines, not a portfolio-wide maximum — confirm the actual capacity for your thickness and width with the provider.

Why do the plate ends need pre-bending?

Any plate rolled through a set of rolls leaves a short flat, un-rolled section at the leading and trailing edge, because the rolls cannot grip and curve the very end of the plate — typically about 1.5 to 3 times the plate thickness. Pre-bending curves those two edges before the main rolling pass, so the finished shell forms a continuous arc without flat spots at the seam. Ask for pre-bending whenever the shell is going to be welded along that seam — a flat zone there creates a stress concentration and makes alignment harder.

What roundness tolerance can I expect on a rolled shell?

We have no sourced roundness or out-of-round figure to give you for a rolled shell, and we would rather say that plainly than borrow one from a different product. Pipe and tube bend ovality standards exist, but they describe pipe bending, not plate rolling into a shell, and applying that number here would not be honest. Ask the provider directly what roundness tolerance their process and your diameter, thickness and grade can actually hold.

Can a tighter diameter be reached with multiple passes?

Yes — the top-roll-diameter multiple that limits a single pass loosens with multiple passes. Trade guidance for 3- and 4-roll machines reports a single-pass minimum around 1.5 times the top roll diameter, versus roughly 1.1 times when the plate is narrower than the full roll width, the material is softer, and it is rolled in more than one pass. It costs more setup time, so weigh it against just specifying a slightly larger diameter.

What information do you need for a quote?

Send the inside or outside diameter you need, the plate thickness, the shell length, and the grade or material number. Say whether the seam is to be welded and whether the ends need pre-bending, and say whether you need an inspection certificate. Those seven things are what turn an enquiry into a firm price rather than a range.

Can I send my own plate to be rolled?

Rolling customer-supplied plate is common practice, but whether a given shop accepts it — and on what terms regarding liability, remnants and traceability — varies by provider. Ask before shipping. If the plate carries an inspection certificate, ask in the same message how they will mark the rolled shell so that traceability survives forming.

Do I get an EN 10204 3.1 certificate?

This is the question worth asking carefully. EN 10204 defines inspection document types 2.1, 2.2, 3.1 and 3.2, and 3.1 is the usual buyer default in steel procurement. But rolling does not create a certificate — the certificate belongs to the material. What matters is whether traceability survives the forming operation, and how the finished shell is marked so it stays linked to its heat. Ask the provider that directly.

Does the shop weld the seam after rolling?

That depends on the provider and what you ask for. Some rolling shops weld the seam as part of the job, others hand back an open shell for you or a separate welding shop to close. Say explicitly in your enquiry whether you need the seam welded — it is one of the things that changes the price and the delivery date.

What is the difference between plate rolling and press-brake forming?

Rolling passes the plate through powered rolls to form a continuous curve — a cylinder, part of a cylinder, or a cone — and is what you want for shells, tanks and pipe sections. Press-brake forming makes discrete straight bends at specific points along the plate, which suits angles, channels and boxed shapes rather than a smooth radius. If the finished part needs to be round, rolling is the process; if it needs sharp, located bends, a press brake is.

What is the lead time for a rolled shell?

No general lead time can be stated honestly — it depends on the provider, their current load, the diameter and thickness, and whether pre-bending and welding are included. Ask for a committed date with your quote rather than assuming a standard turnaround.

What does plate rolling cost?

Plate rolling is not priced from a single rate, so any figure quoted here would mislead. What drives it is plate thickness, steel grade, plate width, the target diameter or radius, quantity and repeat setups, whether the seam needs welding, and whether the ends need pre-bending. Send the seven items in the quote checklist and you will get a firm price instead of a range.

## Related services

[![Press Brake Forming](/images/uploads/2b9fe7c1-e7bc-43ba-9a5e-5b33abe3f913/press-brake-forming-service-steel-sheet-bent-in-press-brake-1920x1080.jpg)

### Press Brake Forming

Press brake forming for steel: bend radius by grade, tolerances and what a quote needs](/services/press-brake-forming "Press Brake Forming — ")[![Straightening](/images/uploads/8099eb30-dfa1-4e0d-af90-34483df600b2/straightening-service-steel-bar-straightening-roll-machine-1920x1080.jpg)

### Straightening

Steel straightening: tolerances by standard, what causes the bow, and what a quote needs](/services/straightening "Straightening — ")

## Partners

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