CategorySlitting
Steel coil slitting: capability, tolerances and what a quote needs
Slitting is a continuous rotary-blade process that converts a wide steel coil into narrower coils or strips at line speed, rather than cutting a length to size piece by piece. This page covers what actually decides the outcome: the coil sizes a line can handle, the width tolerance you can realistically expect, edge quality, and what a processor needs from you before quoting.
What drives the price
- Material thickness
- Steel grade and temper
- Total weight processed
- Slit width and tolerance requirement
- Number of slit widths per coil
- Edge finish requirement
- Recoiling and packaging
What to send for a quote
- Grade or material number
- Incoming coil weight
- Inner diameter
- Maximum outer diameter
- Incoming strip width and thickness
- Required slit widths and quantities
- Required tolerance
- Whether you need an inspection certificate
- Delivery address and required date
Traceability and EN 10204 certificates
Standard for steel purchases: 3.1
The certificate belongs to the material, not to the cut. Slitting does not create an EN 10204 certificate — the real question is whether traceability survives slitting, and how each resulting coil is tagged so that it does.
Standard-defined
Source: EN 10204 defines inspection-document types.
Coil capability
Every figure above is one named supplier's own published capability, not an industry-wide standard. Confirm the achievable tolerance and capability with the provider for your grade, thickness and width.
Supplier-published
Slit width range
0.188 – 72 in · 0.5 – 300 mm
Supplier-published
Slit-width tolerance
| Narrow strip (Scott Stainless Steel) | 0.005 mm | Supplier-published | |
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| Wide strip (Scott Stainless Steel) | 0 – 0.062 mm | Supplier-published | |
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| Standard line (Walmay Stainless) | 0.2 mm | Supplier-published | |
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| Precision line (Walmay Stainless) | 0.1 mm | Supplier-published | |
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Every figure above is one named supplier's own published capability, not an industry-wide standard. Confirm the achievable tolerance and capability with the provider for your grade, thickness and width.
Line speed
| Standard line (Walmay Stainless) | 10 – 50 m/min | | |
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| Precision line (Walmay Stainless) | 5 – 30 m/min | | |
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Supplier-published
Coil thickness capability
| Cold-rolled coil | 0.1 – 6 mm | | |
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| Hot-rolled coil | 0.1 – 12 mm | | |
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Every figure above is one named supplier's own published capability, not an industry-wide standard. Confirm the achievable tolerance and capability with the provider for your grade, thickness and width.
Supplier-published
Camber
| Maximum camber | 2 mm | | |
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| Measured over | 2 m | | |
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An acceptance threshold published for tube forming, not a universal slitting specification. Agree the camber your own end use requires with the provider.
Indicative
Burr height
0.05 mm
Indicative
Services
What slit-width tolerance can I expect?
Slit-width tolerance depends on strip width, thickness and the equipment used, so there is no single industry figure — published numbers vary by supplier. Scott Stainless Steel states a standard tolerance of ±0.005 in on narrow slit coil and -0 in/+0.062 in on wide coil. Walmay publishes ±0.2 mm as its standard tolerance and ±0.1 mm on its precision line. A widely circulated typical-tolerance table from EOXS scales from about ±0.005–0.010 in on material 0.010–0.025 in thick up to about ±0.020–0.030 in on material 0.126–0.250 in thick, but that source labels it 'typical', not a standard. Confirm the achievable tolerance for your grade, thickness and width with the provider.
What coil sizes can be slit?
Capability varies by processor. Chesterfield Steel accepts incoming master coils up to about 50000 lb, with inner diameters of 20–24 in and an outer diameter up to about 72 in, in strip widths from 1.125 to 72 in and thicknesses from 0.015 to 0.250 in. Walmay publishes thickness ranges of 0.1–6 mm on cold-rolled and 0.1–12 mm on hot-rolled coil. Both suppliers note that capability varies by grade and thickness — confirm the exact envelope with the provider.
What is the narrowest and widest strip a slitting line can cut?
This also varies by line. Scott Stainless Steel can slit stainless coil to any width from 0.188 in up to 72 in. Walmay's published range is 0.5–300 mm, with a minimum slit width of 1.0 mm on its precision line versus 0.5 mm standard. Ask the provider for their line's actual range for your grade and thickness.
What is burr height and why does it matter?
Burr is the raised edge the slitting blades leave along the cut. One coil-processing case study reports an acceptable standard, with a properly tuned slitter head, of under about 0.05 mm on cold-rolled commercial-quality and drawing-quality grades — but that is a reported case figure, not a codified cross-industry standard. Excess burr can impair welding, coating adhesion and feeding through automated equipment. State your edge-quality requirement in the enquiry rather than assuming a default.
What is camber and how does it affect my strip?
Camber is the sideways bow along the length of a slit strip. One documented case treats more than about 2 mm of camber over a 2 m length as unacceptable — but that figure comes from a tube-forming end use, not from a slitting line's own published specification. If your process is camber-sensitive, state the maximum you can tolerate rather than assuming a default.
What information do you need for a quote?
Send the grade or material number, the incoming coil's weight, inner diameter and thickness, the strip width you are slitting from, and the slit widths and quantities you need. Add the tolerance you require, whether you need an inspection certificate, and your delivery address and date. Those are what a coil processor needs to quote a slitting job.
Can I send my own coil to be slit?
Toll slitting of customer-supplied coil is a normal service, but whether a given processor accepts it depends on the coil's condition, weight and dimensions fitting their line, and terms vary by provider for liability, remnants and traceability. Ask before shipping. If the coil carries an inspection certificate, ask in the same message how the slit coils will be tagged so traceability survives.
Do I get an EN 10204 3.1 certificate?
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 slitting does not create a certificate — the certificate belongs to the material. What matters is whether the material's traceability survives the slitting operation, and how each resulting coil is tagged so it stays linked to its heat. Ask the provider that directly.
Is there a minimum order quantity?
There is no industry-wide minimum order quantity for slitting; it varies by provider. Some will slit a single coil, others price small runs in a way that makes them impractical. Ask as part of your enquiry rather than assuming.
What is the lead time?
No general lead time can be stated honestly — it varies by provider, and with coil size, quantity and their current line load. Ask for a committed date with your quote.
How is slitting different from sawing or shearing?
Slitting is a continuous rotary-blade process that converts a wide coil into narrower coils or strips at line speed — Walmay's published line speeds range from about 10–50 m/min standard down to 5–30 m/min on precision runs. Sawing and shearing instead cut a length to size from bar, plate or sheet, piece by piece. If your requirement is narrower coil for further processing, slitting is the fit; if it is finished-length pieces, sawing or shearing is.
What does slitting a coil cost?
Slitting is not priced from a single rate, so any figure quoted here would mislead. What drives it is material thickness and grade, the total weight processed, how many slit widths you need from one coil, your tolerance requirement, and the edge-finish standard you require. Send the details in the quote checklist and you will get a firm price instead of a range.
