Coil stock
Coiled flat-product identity, strip versus coil dimensions, line compatibility, flatness and storage requirements.
Tags: materials, stock-forms, coil, flat-products
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Delivery form and material identity
Duferco's 2019 hot-rolled pickled-and-oiled envelope lists 18 kg/mm specific coil weight. At an assumed 1,000 mm strip width, that implies 18,000 kg on the stated basis. Duferco HRPO data, pp. 1–2 Check actual coil mass, outside diameter, bore and handling equipment separately. Finished flatness depends on the cut-to-length route. ArcelorMittal cut-to-length guidance
Coil stock is flat material delivered wound for subsequent processing. Keep the delivery configuration separate from alloy/grade, condition, coating and product specification. A coil description alone does not establish strength, formability, corrosion resistance or finished-part tolerances.
For a steel example, ArcelorMittal Dofasco distinguishes hot-rolled black/plain product, carrying hot-rolling oxide scale, from hot-rolled pickled-and-oiled product, whose scale is removed by acid pickling before oil is applied for protection or lubrication. Pickled-and-oiled therefore describes a processing/surface route, not a separate universal strength grade. Dofasco, hot-rolled products
| Record field | Meaning to preserve |
|---|---|
| Material/product specification | Grade or alloy, condition/temper, applicable standard and edition |
| Strip dimensions | Metal thickness, strip width, their tolerances and measurement basis |
| Coil dimensions | Inside diameter (ID), outside diameter (OD) and any permitted ranges |
| Quantity | Net metal mass, gross package mass and any separately stated length |
| Surface and edges | Finish/coating, protected face, mill or slit/trimmed edge, burr acceptance |
| Delivery arrangement | Winding direction, orientation, packaging and coil identification |
Do not place strip thickness and coil OD in the same dimensional field. Distinguish a master coil from child slit coils and retain the parent heat/coil identity when material is divided.
A bounded supply example
Duferco Steel Processing's HRPO sheet, explicitly updated 26 April 2019, lists the following product envelope:
| Published item | Supplier value |
|---|---|
| Gauge | 1.2–3.0 mm |
| Width | 925–1525 mm |
| Coil mass | 16–25 metric tonnes |
| Maximum OD | 1880 mm |
| ID | 508 mm; 610 mm by request |
| Specific coil weight | 18 kg/mm |
These entries describe the cited offering, not a universal coil standard or proof that every combination is orderable. Confirm the quotation, grade, actual mass and compatible dimensions together. The document's 2019 printed update takes precedence over the later directory date in its download URL. Duferco, Hot Rolled Pickled and Oiled products, pp. 1–2
Before release to a processing line, compare the actual ID with mandrel capability, OD and width with the machine envelope, and total mass with the approved handling/payoff rating. Check compatibility jointly: matching only one dimension is insufficient. Obtain equipment-specific operating instructions rather than deriving speeds, braking settings or lifting arrangements from this page.
Uncoiling, levelling and finished flatness
Coil delivery and finished flat-sheet performance are different acceptance states. ArcelorMittal's A40 steel coils for laser cutting page links sheet performance to suitable decoiling and certified cut-to-length processing. Its dimensional section explicitly declines a flatness guarantee for supplied coil products because final flatness depends mainly on uncoiling and levelling. This qualification belongs to that product family; it is not a universal tolerance rule. ArcelorMittal A40, applications and dimensional tolerances
For slitting and cutting to length, define usable width, trim, burr direction/limit, permitted joins and identification of resulting pieces. Surface-side orientation matters when one face is appearance-critical. Keep processing allowances separate from ordered metal dimensions; do not silently count damaged outer wraps or edge trim as usable yield.
Length and yield estimates
An ideal tightly wound coil of uniform thickness has geometric strip length
L = π × (OD² − ID²) / (4 × t).
All dimensions must use the same unit. This derivation equates the annular cross-sectional area with thickness times length; it excludes interwrap gaps, coatings, cores and irregular winding. With assumed, unrelated dimensions OD 1200 mm, ID 600 mm and thickness 1 mm, the ideal length is approximately 848,230 mm, or 848.2 m. This is an estimating example, not a coil certificate or equipment setting.
A mass-based estimate additionally needs an applicable density and net-metal mass. Purchased mass, theoretical strip length and accepted part count are different quantities. Part yield also depends on nesting, trim, cut losses and rejected material; record those assumptions explicitly.
Storage and handling boundaries
SSAB's GreenCoat color-coated steel storage guide, V2-2024, warns that moisture can remain between coil laps and that wrapping should not be relied upon to keep coils dry. It calls for clean, smooth supports and describes purpose-made cradles; partly used coils can fit original pallets differently. These are GreenCoat product instructions, not a lifting or racking design for every coil. SSAB GreenCoat storage guidelines, pp. 4–5
At receipt, record identity, damage, moisture and package condition before accepting material for use. Retain the supplier's packaging and storage instructions with the product. Reassess support and identification after partial consumption. Handling, restraint removal and loading require the site's approved equipment-specific procedure; this reference does not establish a safe stacking configuration or lifting capacity.
Source scope and release record
Retain producer, heat/coil ID, material specification/edition, grade/condition, coating, strip dimensions, coil ID/OD, net/gross mass, certificate and downstream processing record. Link child coils or blanks to their parent identity.
Duferco prints an April 2019 update and SSAB identifies V2-2024. Dofasco and ArcelorMittal A40 are live pages without a separately verified technical revision date. A40 references EN 10051:2010 in its tolerance offering; that supplier reference does not establish the current contractual edition for another order. Confirm binding requirements at purchase.