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Materials Sourcing for Narrow Strip

Every stainless processor will quote you a slit width. Far fewer will tell you what happens to the edge, the flatness and the burr as that width gets smaller, and that is where a narrow strip order either works or comes back. Here is what our own slitting line publishes, and how to read it before you order.

This guide is built from our own published capability, using the coil slitting specification published with the precision stainless steel strip range and the production line description on our production lines page. Where a value is engineering judgement rather than a published figure, I have said so.

My position is on material selection and cold rolling applications, so the bias I bring is mechanical. A narrow strip order is a decision about what happens on the knife, the edge and the coil afterwards, and the width is only the first question.

What the Slitting Line Actually Publishes

Start with the numbers, because a supplier who will not give you the limits is asking you to find them on your own line. The table below sets our published slitting service against our published hard precision range. The slitting service also covers coil cutting to length, with a length tolerance of plus or minus 2 mm.

Why Narrow Strip Is an Edge Problem Before It Is a Width Problem

Narrow strip is harder not because the knife cuts a narrower piece of steel, but because the same cut creates proportionally more edge. A 10 mm strip carries two slit edges across its width. A 1500 mm coil carries the same two edges with 150 times the width between them, so per kilogram the narrow strip carries 150 times more cut edge.

That sheared surface behaves differently from the rolled surface beside it. The cut edge is work hardened, and in a cold-worked temper it is the hardest and most crack-sensitive part of the strip. This is why edge condition is a specification line rather than a finishing detail. Our published hard precision range offers slit edge or mill edge, with straightness and edge quality published separately.

The practical consequence for a buyer is that the burr at a narrow slit edge is a percentage of the strip width, not of the coil. A burr invisible on a 300 mm strip is a significant feature on a 12 mm strip, and it becomes a feed problem before it becomes a dimensional complaint.

How Thickness Changes the Answer at the Same Nominal Width

The second lever is the thickness-to-width ratio, and it is the one buyers most often forget. A 10 mm strip at 0.03 mm thickness is a ratio of roughly 330 to 1. The same 10 mm width at 0.3 mm is 33 to 1. The first is a foil held on edge by the slitter; the second is a strip.

That ratio drives three things at once. Flatness is harder to hold, because thin wide strip buckles readily and thin narrow strip wanders across the knife. Camber is harder to hold, because the natural curl of a cold-worked strip is set by the coil geometry and the slit relieves it unevenly. And burr height is harder to control, because the sheared edge displaces more material against the strip section.

This is why the published hard precision product tops out at 0.3 mm thickness while the general slitting service reaches 3.0 mm. They are different products answering different questions, and the narrow precision product is where thickness, width and edge quality are controlled together.

What the Absolute Width Tolerance Means at 10 Millimetres and at 600

This is the most useful thing to do with a published tolerance, and it costs nothing. A band of plus or minus 0.2 mm is 2 percent of a 10 mm nominal width and 0.03 percent of a 600 mm nominal width. The same number describes two very different products, and the division is what tells them apart.

Why it matters comes down to what your part does with the width. If the finished blank width is the whole feature, a 2 percent band is a scrap risk on every piece. If the strip is an input you later cut into a component, a tight band gives you more room against your own cutting allowance.

According to ASTM A240/A240M, Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip, dimensional and mechanical requirements for cold-rolled strip are set per grade and product form, with the referenced test methods those in ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products. Whatever width you buy, the certificate supporting it comes from that framework, and it is the reference your customer measures you against.

What Corrective Leveling Does and When You Need It

Corrective leveling decides whether a slit strip arrives as a usable coil or as a coil you fight on your line. Slitting relieves stresses across the coil, and the strip carries residual stress and a set. The correcting pass puts a controlled flatness back in, and the work scales with how narrow the strip is and how hard the temper is.

Our published coil slitting service includes corrective leveling, and the hard precision range publishes higher requirements on straightness and edge quality separately. So the question is not whether a supplier owns a leveler; it is whether the leveler is specified into the job you are quoting.

The practical test is simple. If the strip will be blanked and the blank is wider than about fifty times the strip thickness, ask for the leveling to be specified, because at that ratio the coil set presents as a feed variation your tooling has to absorb.

For austenitic grades there is one more point. Our published capability for 304 notes that it readily work hardens and cannot be hardened by heat treatment, so a cold-worked strip that is later formed will keep working. That is why temper and delivered thickness belong in the enquiry.

Which Grades and Tempers Make Sense at Narrow Width

The grade choice at narrow width is driven by the application, not by the slitting difficulty. Our published precision range lists the common austenitic and ferritic grades with their applications: medical devices such as scalpels, circuit board stock, fasteners including tower springs and circlips, and appliance blades.

On grade, the published attributes point in different directions and the answer depends on the environment. Type 304 is austenitic with a minimum of 18 percent chromium and 8 percent nickel, giving strong corrosion resistance and heat and low-temperature resistance, and it is the general answer for a formed strip in ordinary conditions. Type 430 is ferritic and particularly resistant to nitric acid, with good intergranular resistance across many corrosive environments. Our published selection guidance is to weigh appearance, the corrosion environment and the cleaning method, then cost.

On temper, our published hard precision range runs 1/8H, 1/4H, 1/2H, 3/4H and H, and the wider range runs annealed, 1/4H, 1/2H, 3/4H and H. At narrow width, temper is an edge decision as much as a forming one, because the harder the temper the more crack-sensitive the cut edge becomes.

According to ASTM A666/A666M, Standard Specification for Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar, the annealed and cold-worked conditions are separate product forms with their own acceptance requirements, so “304″ without a temper leaves the band unstated.

What to Put in a Slit Strip Purchase Order

A narrow width order should be longer than a wide one, because there are more things that can go wrong as the width falls. Each line below is the one that gets decided on the shop floor if you leave it out.

1. Grade and standard. The grade and the standard it is certified against, from our published set of ASTM, AISI, GB, JIS, EN and KS.
2. Temper. Annealed, 1/4H, 1/2H, 3/4H or H for the general range; 1/8H through H for hard precision.
3. Thickness with its tolerance. Nominal thickness plus the band, for example 0.10 mm plus or minus 0.005 mm.
4. Width with its tolerance, and the tolerance as a percentage. This stops a 10 mm strip and a 600 mm strip being read as the same product.
5. Edge condition. Slit edge or mill edge, and whether edge conditioning and deburring are required.
6. Surface finish. 1D, 2D, 2B, BA, HL, NO.4 or 8K, and whether PVC film or paper interleaving is wanted.
7. Flatness and straightness. Whether corrective leveling is specified into the job, and the straightness requirement.
8. Coil geometry. Inner diameter, coil weight, and whether the order is slit strip or cut to length.
9. Inspection document. The mill certificate with chemical composition, the mechanical results for the delivered temper and thickness, and the heat number for traceability.

Send us the part you are making, the width, the thickness and the annual volume, and we will return the grade, temper, edge condition and tolerance band your process can run. The precision stainless steel strip range covers the product scope, and our production line carries the cold rolling, leveling, surface treatment and deep processing equipment, with OEM and ODM service.

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About the author

Published 10 November 2026 · Last verified 10 November 2026 · Slit width 10 mm to 1500 mm, thickness 0.03 mm to 3.0 mm, width tolerance plus or minus 0.2 mm, corrective leveling and coil cutting to length verified against the precision stainless steel strip range; hard precision specification of 0.03 mm to 0.3 mm thickness, 10 mm to 600 mm width, plus or minus 0.005 mm thickness, plus or minus 0.1 mm width tolerance, slit or mill edge, 1/8H to H temper and 3 MT minimum order verified against the hard precision strips page; production line equipment and ASTM, AISI, JIS, BS EN and DIN conformance verified against the production lines page. Edge behaviour, flatness practice and the width-to-thickness ratio guidance are engineering practice and must be confirmed against the specific order. This is sourcing and specification guidance, not a regulatory determination; certification scope and material declarations must be confirmed for the application and destination market before an order is placed. No price, cost, profit or margin figure is quoted.