Steel Coil · Standard EN 10346
EN 10346 Coated Coil — Two Fields Decide the Order, and One Is Usually Missing
This standard covers continuously hot-dip coated flat steel for cold forming. An order against it needs the coating designation — what is on the steel, how thick, and what the surface is expected to be. It also needs the edition the contract invokes. Buyers are careful with the first field and frequently silent on the second, which is the one that decides which text the coating is measured against.
Price on request · Coating designation and contract edition confirmed before quoting
Coated Product Fit
The coating is the product, not a finish on someone else's steel
If you estimate coated flat products or release them to a forming line, the standing difficulty is that two items can carry the same substrate and still be different products. What separates them is the coating — and the coating is what the order has to describe.
A hot-dip coated coil starts from cold rolled substrate, which is why coated and uncoated material get discussed in the same conversation and quoted from the same product list. The resemblance stops at the surface. Once a coating is applied, the thing being bought is a coated product with its own designation, its own specified coating mass, its own surface condition and its own test basis. The substrate tells you almost nothing about whether the delivered coil will perform.
This is the trap for an estimating engineer. A quotation lists a coating family and a thickness, both of which look complete, and the enquiry proceeds. What has not been established is the coating designation — the expression that says which coating and how much of it — or the delivery condition the material is supplied in. Those two fields are the substance of a coated order.
There is a second field, quieter, that experienced buyers have learned to check explicitly: which edition of the standard the contract invokes. Standards for coated products are maintained and revised, and revision work is visible while it is happening. Activity around a standard is not the same thing as a published edition, and an order that names the standard without a date has not said which text governs the coating it is buying.
Why the edition matters more on coated products
On plain carbon product the grade does most of the work. On a coated product the requirement is spread across the coating designation, the coating mass, the surface condition and the tests that demonstrate them — all of which are expressed in the standard. If two editions express any of those differently, the same words on two purchase orders describe two different products. That is why the coated order needs the edition settled before the coating is specified rather than after.
This is your standard if…
- The product is continuously hot-dip coated. The coating is applied by passing the steel through a molten bath, which is what gives the product family its character and its designation system.
- It is flat product intended for cold forming. The coil is destined to be bent, profiled or pressed — cladding, decking, sections or appliance work — rather than used flat as-delivered.
- The coating is being bought for what it does. Corrosion resistance, appearance, or both. The coating is the reason for the purchase, which is exactly why it has to be specified rather than assumed.
- The coating designation is yours to state. You are in a position to write the coating system and its mass on the order, or to confirm them against a project specification that already does.
Move to a different route if…
- The material is uncoated and the surface is the steel itself, so a different standard applies. See EN steel grades
- You are still deciding which standard governs the product at all. See the coil standards index
- You need the coated product supplied as sheet rather than coil. See the steel sheet range
Declaration Check
Five fields a coated order has to declare
Describe the order as you would place it. The check reports what the declaration carries, where it is silent, and whether the edition question has been answered — it states no coating mass figure and no edition year.
Declare the coated order
Describe the order as it stands today. The check separates the fields that define the product from the ones that only supply it.
This reviews a declaration, not a product. It states no coating mass figure, no coating composition and no edition year, and it makes no judgement about whether a coating suits an environment.
Declaration findings
Answer the five fields above. The review reports which define the coated product, which only supply it, and whether the edition question has actually been answered.
Nothing here is a specification against a standard, and nothing here states which edition is current. It is a check that the declaration identifies a coated product rather than describing one.
Why a number alone does not fix the edition
A standard's number is stable; its content is not. When a standard is maintained, the number carries on while the text behind it changes. So an order citing the standard without a date is consistent with more than one document, and the parties may each believe they have agreed the same requirement when they have not. On a coated product that gap is expensive, because the disputed field is usually coating mass or surface condition — measured quantities that either meet a stated figure or do not. The way to close it is procedural rather than technical: cite the edition your contract invokes, and read the publisher's own catalogue to establish which text that is. Trade discussion, a supplier's product list and a draft circulating for comment are all useful signals, and none of them is the standard.
Where It Stops
Four things a coated order is often asked to assume
Each of these is a shortcut taken when a coated product is specified from a description rather than from the standard. Each one moves a decision onto the mill that belongs to the buyer.
The coating is left to the mill's standard product
An order that names a coating family and a thickness and stops there has specified a kind of coating rather than an amount of it. Two mills can supply the same family at different coating masses, both conforming to the standard, and both describing themselves as the product you asked for.
Boundary: the coating mass is a measured requirement. State it, or accept whichever figure the mill applies.
A newer edition is assumed to apply automatically
Publication of a revised or updated text does not by itself move an existing contract onto it. The edition governs because the contract invokes it. Assuming the most recent text applies is a decision taken silently, and it is the buyer who carries it.
Boundary: check what your contract cites. Establish which text is published from the publisher, not from the assumption.
The substrate grade is treated as the specification
Coated products get quoted from a substrate-first product list, which makes the underlying steel feel like the substance of the order. It is not. Once coated, the coating designation, the coating mass and the surface condition carry the performance the buyer is paying for.
Boundary: specify the coated product as a coated product. The substrate is one field, not the specification.
Appearance requirements are assumed to follow from conformance
Conformance establishes that the coating meets the standard's requirements. It does not establish that the visible surface meets an architect's or a client's expectation. Those are different requirements, and only one of them is on the mill's certificate.
Boundary: if appearance is judged at handover, write it into the order. It will not arrive by implication.
The pattern is the same across all four: a coated product is being treated as its substrate with something added, so the fields that actually define it are left implicit. The remedy is to write the order as a coated order — coating designation, coating mass, surface condition and delivery condition stated, and the edition named — and let the mill confirm rather than interpret.
Order Conditions
What a coated coil order has to carry
A coated product is defined by fields that do not exist on an uncoated order. These are the ones the mill works to — anything absent is decided by whoever quotes.
| Order field | What it decides |
|---|---|
| Coating designation with coating mass | Which coating system is applied and how much of it. This is the field that defines the coated product; without it the order names a family rather than a product. |
| The edition the contract invokes | Which text the coating, the surface condition and the test basis are measured against. Without it the same words can describe two different products. |
| Substrate grade | The steel beneath the coating, which governs formability and is required alongside the coating rather than instead of it. |
| Thickness and width, with tolerances | The delivered size band inspection accepts against. Coating is additional to this, not part of it, so the two must be stated separately. |
| Surface condition and treatment | What the visible surface is expected to be, and any treatment the coil is supplied with. This is what the client inspects at handover. |
| Delivery condition | How the product is supplied to you, which the standard expresses as a distinct condition from the coating itself. |
| Forming duty and coil geometry | The operation the coated material must survive and whether the coil suits your decoiler — inner diameter, outer diameter, mass range and quantity. |
| Tests, documents and destination | What is demonstrated at acceptance, against which basis, and the protection and document set the receiving end expects. |
Related standards and routes on this path
Releasing coated coil to a line
- Confirm the certificate cites the standard with the same edition your contract invoked, not the number alone.
- Check the coating mass on the documents against the figure your order stated — not against a generic product description.
- Verify the surface condition recorded matches what the finished work will be judged on, particularly where appearance matters.
- Compare thickness against the specified figure, remembering the coating sits on top of the ordered steel thickness rather than inside it.
- Record the handling, wrapping and storage conditions on arrival, since coating damage in transit shows up later as corrosion and is hard to attribute once the coil has been unbanded.
Why the declaration is worth writing down
A coated coil can conform on every measurement and still be rejected in service, because the requirement it was bought against was never stated. Establishing the coating designation and the edition at enquiry stage costs one exchange. Establishing it after finished panels have been fixed to a building costs a commercial conversation in which nobody can point to what was agreed.
GCC Supply
Coated coil into Gulf environments
Coated product is bought for what the coating does, so the destination is part of the specification rather than a delivery detail. Coastal humidity, salt exposure and site storage all bear on whether the coating specified will still be performing when the client inspects.
United Arab Emirates
Local and re-export enquiries where the coating designation and the contract edition are settled together before the coil is committed.
Steel coil supply for United Arab Emirates
Saudi Arabia
Programme volumes for cladding and building envelope work, where the coating is chosen against the exposure the finished panels will see.
Steel coil supply for Saudi Arabia
Qatar
Project supply with a technical submittal, so the coating designation and the edition have to be on the record before material is released.
Steel coil supply for Qatar
Oman
Port-oriented routes where coastal exposure makes the coating the decisive field and transit protection part of the specification.
Steel coil supply for Oman
Bahrain
Industrial supply where the document set carries weight, because the coating is demonstrated by certificate rather than by inspection alone.
Steel coil supply for Bahrain
Kuwait
Manufacturing supply where the coated coil feeds a profiling or pressing line, so coating and forming duty are fixed before the run.
Steel coil supply for KuwaitThese pages set out the supply route and enquiry handling for each destination. They do not claim local warehousing, stockholding, a branch presence or a delivery timescale — those are confirmed against your own order. Where a coated coil is destined for a corrosive site environment, state the exposure the finished component will see. The coating designation is chosen against that exposure, and a designation picked from a generic product list without reference to it is a decision made by nobody.
Reference Notes
Reading a coated standard, and the limits of what this page will state
A coated standard does several jobs at once: it designates the product, fixes the coating systems it covers, and sets the basis on which the coating is demonstrated. That is why the edition is not a formality.
A coated standard defines a product family, not a single product
The standard sets out the coating systems it covers, how the coating is designated, the conditions it may be supplied in and the basis on which it is demonstrated. It is a framework within which many distinct products exist. Choosing one of those products is the buyer's act, and the framework does not do it for them.
Edition and product designation are different decisions
The edition decides which text you are working to. The designation decides which product within that text you are ordering. Both have to be settled, and settling one does not settle the other — a buyer who fixes the edition but leaves the coating mass open has done half the work and the more visible half.
Publication status is a publisher's fact, not a trade signal
Coated standards are maintained, and the work is often discussed long before it concludes. Discussion, a draft circulating for comment, and a published edition are three different states. For an order, only the third matters — and establishing which is a reading from the publisher's catalogue rather than an inference from what the trade is saying.
The certificate demonstrates the coating, and only the coating
A certificate shows that the coated product met the stated requirements on the stated basis. It says nothing about whether those requirements suit the environment the finished component is going into, and nothing about appearance beyond what was written into the order. Reading it as broader assurance than that is the most common misreading on coated supply.
This page states no coating mass figure, no coating composition, no thickness range and no test value, and it makes no claim about which edition is currently published or whether a revision has been issued. Coated standards are maintained, and both the content and the publication status change — so the publisher's own catalogue is the only source that stays accurate. Read the edition your contract invokes, and confirm its status there before applying it to an order.
Which field answers which question
Coating designation and mass
Which coated product this is — the field that defines what is on the steel and how much.
The contract edition
Which text the coating, the surface condition and the test basis are measured against.
Substrate grade and dimensions
What the steel underneath is, and the delivered size band inspection works to.
Surface condition and delivery condition
What the visible surface should be, and how the product is supplied to you.
Tests, documents and destination
What is demonstrated at acceptance, and what protection the route in requires.
FAQ
Coating designation and edition questions
What does the coating designation actually tell me?
It says what is on the steel and how much of it — the coating system and the specified coating mass per unit area, expressed in the terms the standard uses. Without it, an order names a coating family and leaves the quantity to whoever quotes, which is the single most common gap on a coated enquiry.
Is the latest edition automatically the one my contract uses?
No. An edition governs because the contract invokes it. If your purchase order or project specification names a particular text, that is what your coating will be measured against — regardless of whether a newer one has since been published. Check what your contract actually cites rather than assuming the newest text applies.
Work is under way on a revision. Should I order against it?
Only if it has been published and your contract names it. Development activity, drafts and committee documents are not published standards and do not govern a live order. Until a text is issued, a contract citing the standard is citing the published edition it already had — verify that position with the publisher rather than working from trade discussion.
How is the delivery condition different from the coating?
The coating is what is on the steel. The delivery condition is how the product is supplied to you — including the surface condition and treatment it arrives with. Both are order conditions and both are expressed in the standard, which is another reason the edition has to be settled before the order is placed.
What has to be on the enquiry before a coated quotation is meaningful?
The coating designation with its coating mass, the substrate grade, the thickness and width with tolerances, the surface condition and any treatment you require, the forming duty, the coil geometry and quantity, protection for transit, your destination, and the tests and documents the project calls for — plus the edition your contract invokes.
Where It Is Applied
Applications where the coating designation decides the outcome
Coated product is specified against what the finished component has to survive. These application routes carry the requirement from the end-use side, which is where the coating decision usually becomes concrete.
A building envelope specification names a coating family
The specification says which coating system the facade is to use and stops short of the coating mass, leaving the durability requirement expressed as a material rather than a quantity.
Coil is bought for a profiling line feeding a project
The coil is ordered before the erection programme is fixed, so the coating and the forming duty both have to be settled on the strength of the project documents rather than on site conditions.
A project specification references an older edition
The specification was written against the text in force at design stage, and the question is whether it still governs or whether the contract has moved on since.
Material is specified alongside uncoated items on one order
One purchase covers both coated and uncoated components, and the coated line items need their own declaration — the uncoated fields do not describe them.
A client rejects finished panels on appearance
The coating conformed to the standard and the panels still did not match, because the surface condition was never written into the order and conformance does not carry appearance.
Stock is held between phases of a project
Coil bought for one phase is carried into the next, and someone has to confirm the coating designation and the recorded edition still suit the second use.
How the application routes take the decision forward
Where the coating is being chosen for what the finished building element has to withstand, the application route is the better starting point than the product standard, because it works back from the exposure rather than forward from a product list.
Coated coil for cladding
Where the coating is being chosen for the appearance and weather exposure of a building envelope rather than from a product list.
See cladding routeCoated coil for roll forming
If the coil is destined for a profiling line, this route takes the forming duty and the coating together rather than separately.
See roll formingSteel coil standards
The other standards this route is ordered against, if the governing document itself is still the open question.
See coil standardsOne more route worth knowing about while the coating is being decided: if the material will be supplied as flat product cut to length rather than as coil to feed a line, the dimensional and handling questions change even though the coating requirement does not. The steel sheet range covers that form.
Request a Quote
Send the coating designation with its coating mass, the substrate grade, the thickness and width with tolerances, the surface condition and any treatment required, the forming duty, the coil geometry and quantity, transit protection, your destination, the tests and documents the project calls for, and the edition your contract invokes. Price is on request.
Coated coil enquiries on this route are handled through the steel coil desk — the main steel coil enquiry desk. The form here reaches the same team.
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