Galvanized Coil vs Cut-to-Length Sheet: Landed Cost Comparison

When a Coil Is the Right Buy, and When Cut-to-Length Sheet Is

The question comes up on almost every galvanised order: should I buy coil and cut it locally, or buy cut-to-length sheet and skip the leveling line entirely? The wrong answer costs three to eight percent of the order value, and it depends far more on your order pattern than on the unit price per ton.

Buy coil if you run a continuous process, if you need many sizes from one heat and one coating batch, if your order is large enough to justify a single container of each size, or if local leveling capacity is available at a competitive cutting charge. Buy cut-to-length sheet if you need many different sizes in small quantities, if you have no leveling line and no reliable local processor, if the sizes are short and hard to level from coil, or if you want the supplier to carry the flatness and camber risk.

Processing: What Changes When Someone Else Does the Leveling

Coil is uncoiled, tension-levelled, sheared to length and stacked. The difference between a good and a bad cut-to-length line shows up in three measurable values.

Property	What good CTL looks like	What to specify
Flatness	Within 4 mm per metre	State max flatness on the PO
Camber	Under 2 mm per metre of length	Ask for camber limit
Length tolerance	Plus or minus 2 mm on cut length	Confirm against EN 10131
Burr height	Under 0.05 mm, burr down	Specify burr side for stacking
Surface	No coating cracking at the bend	Watch for zinc flaking

Cutting charge is normally quoted per ton, not per sheet, and it varies widely: expect roughly USD 15-30 per ton for plain leveling and shearing, plus a setup charge for short runs. Tension leveling (which stretches the strip slightly to remove coil memory) costs more than simple leveling but produces genuinely flat sheet. If the processor only has a simple leveler, expect some residual coil set, especially on thinner gauges.

MOQ and Order Shape

The MOQ difference between coil and sheet is the biggest reason small buyers should not assume coil is cheaper.

Item	Coil	Cut-to-length sheet
Typical MOQ per size	25 t per size	15-20 t total, mixed sizes
Number of sizes in one MOQ	One size and coating per line	Several sizes from one coil
Mill setup	One rolling and coating run	Same coil, different shear lengths
Cut-off length	Coil ID 508 or 610 mm, weight 3-5 t	Fixed, e.g. 1000 x 2000 mm
Scrap and offcut	None at purchase	1-3% offcut and lead-end scrap

If your annual requirement for a size is under one 25 t lot, coil forces you to over-buy one size while sheet lets you spread the quantity across sizes from a single melt. That flexibility is often worth more than the leveling charge.

Landed Cost: The Six Lines That Decide It

Compare on a landed basis, not on an FOB per ton basis. The table below is a worked comparison per ton of delivered material.

Cost line	Coil path	Sheet path	Notes
FOB material price	Base	Base plus 1-2%	Sheet carries the mill cutting margin
Coating and packaging	Same	Same plus 0.5%	Sheet needs better edge protection
Ocean freight	Lower per ton	Slightly higher per ton	Coil stows denser
Leveling / cutting	Paid locally	Included in purchase	Local charge 15-30 USD/t
Scrap and offcut	Near zero	1-3%	Real money on short sizes
Storage handling	Coil needs decoiler space	Sheet stacks anywhere	Adds labour for coil

On a 100 t order the coil path usually wins by 3-8% once cutting is priced properly, but it flips to the sheet path if your sizes are short, if your order is small, or if you have to outsource leveling to a slow third party.

Loading: What Fits in a Container

Coil is dense and heavy: a 20GP takes about 25 t of coil and fills the floor fast. Sheet is lighter per unit volume and better at filling the space.

Cargo	20GP fill	Notes
Coil	About 25 t	Weight limited
Cut-to-length sheet	18-22 t	Volume limited but easier to pack

If your total order is under one container load, sheet gives you a fuller container and a lower freight per ton on the volume you are actually buying.

Quality Risks to Watch

Leveling is not a neutral operation. It changes three things your customer will notice:

• Coil set and oil-canning. Simple leveling leaves residual curvature; check flatness on a surface plate.
• Yield strength increase. Cold working during leveling raises yield in the outer fibres and lowers ductility slightly, which matters for deep forming.
• Coating damage. Bending over a small radius can crack the zinc or paint film; ask for the bend radius used and inspect edges for flaking.

Ask for a flatness sample or a pre-shipment flatness report with photos, and hold the last container until you have approved the first one.

Tell us the sizes and quantities you actually need per month and your discharge port, and we will advise whether coil or cut-to-length sheet is the cheaper route for your pattern, then quote both so you can compare on a landed basis.