A mill certificate (MTC) is the document that proves a specific batch of 5083-H116 aluminum plate actually meets its chemistry and strength limits. For marine plate, the certificate you should receive is an EN 10204 3.1 (mill-certified actual test results), and for classed vessels it should sit under a CCS / ABS / DNV / LR / BV material approval that covers 5083-H116 at your thickness. The four things that decide whether you can trust it are: (1) the heat number on the certificate matches the number stamped on the plate, (2) the actual chemistry and mechanical results meet the standard minimums, (3) the certificate covers your exact temper and thickness, and (4) the document is a real 3.1 or a properly witnessed 3.2. Everything below walks through each field, the heat-number cross-check, third-party re-inspection, and the traceability chain.
Why a mill certificate decides whether you can order 5083-H116 marine aluminum plate
When you buy 5083-H116 aluminum plate for a hull, a tank barrel, or an offshore structure, the drawing and the purchase order tell the supplier what to make. The mill test certificate (MTC)-also called a mill certificate or material certificate-is the only document that proves the actual plates you receive are the alloy and temper you specified, with chemistry and strength verified by test, not just promised in a quote. A class surveyor, your QA team, and your insurer will all ask for it before the material goes into service.
For 5083-H116 specifically, the certificate is what separates "marine-grade aluminum" claimed in marketing from "5083-H116 that meets ASTM B928 / EN 485-2 minimums and is accepted by a classification society." Reading it correctly is the difference between placing the order with confidence and discovering a mismatch at the shipyard-when rework and delays are already expensive. This guide uses a typical 5083-H116 plate certificate as the sample, field by field.
EN 10204 3.1 vs 3.2 aluminum mill certificates
Most aluminum plate shipped from China and Europe is documented against EN 10204, the European standard that defines what kind of "inspection document" you get. The two types buyers meet most often are 3.1 and 3.2, and the difference matters for how much independent checking the numbers have had.
| Feature | EN 10204 3.1 | EN 10204 3.2 |
|---|---|---|
| Who issues it | The mill's authorized inspection representative | The mill representative plus an independent party (purchaser's or agreed inspection agent) |
| What it certifies | Actual test results on the specific heat, certified by the manufacturer | Same results, with the independent party having witnessed or verified the tests |
| Independent witness | No | Yes-signature/stamp of the independent inspector |
| Typical use | Standard export shipments, general marine and structural use | Critically classed vessels, pressure equipment, or where the contract demands witnessed docs |
| Cost & time | Included with the shipment | Extra fee and lead time for the witness/inspection |
Source: EN 10204:2004 (Metallic products-types of inspection documents).
A 3.1 is not a "lower" certificate-it is the certified actual results for that heat, signed by the mill. A 3.2 simply adds an independent witness. For most 5083-H116 marine orders, a genuine EN 10204 3.1 mill certificate is sufficient; request 3.2 only when your class society or contract requires witnessed documentation.
CCS approval and class-society coverage for 5083-H116 aluminum plate
CCS (China Classification Society) is one of the IACS member classification societies. When 5083-H116 aluminum plate is ordered for a classed ship or offshore structure, the buyer usually needs the material to fall under a class-society material approval-issued by CCS, ABS, DNV, LR, BV, or another society-that defines the approved grade, temper, and approved thickness range. The approval number and the thickness range it covers should appear on or alongside the mill certificate.
The point buyers miss most often: a supplier can hold approval for 5083-H116 at, say, 6–50 mm but not at 3–6 mm. If your project uses 4 mm or 5 mm plate, the certificate must show the approval covers that thin range, or the surveyor can reject the lot. Always ask for a coverage table: grade × temper × approved thickness range that is currently in force, and confirm it names 5083-H116 at your thickness.
guide to a 5083-H116 aluminum mill certificate
Below is a representative layout of a 5083-H116 plate mill certificate and what each block tells you. Use it as a checklist when the PDF arrives.
Header and certificate-type block of the aluminum mill certificate
The top of the document carries the certificate number, issue date, the issuing mill, the EN 10204 type (3.1 or 3.2), and the standard the material is judged against (commonly ASTM B928 / B209, EN 573-3, EN 485-2, or GB/T 3880). Verify the certificate number is unique to your order and the date is sensible relative to shipment-reused or undated certificates are a warning sign.
Product and dimension block of the 5083-H116 aluminum certificate
This block states the material as EN AW-5083 / Aluminum 5083, temper H116, the dimensions (thickness × width × length), piece count, and weight. Confirm the temper reads exactly H116 (not H321 or O unless you ordered those), and that the dimensions and weight match your purchase order and the packing list.
Chemical composition block of 5083-H116 aluminum
The certificate reports the actual heat analysis for the elements below, which must sit inside the specification limits. These are the EN 573-3 / ASTM B209 limits for 5083; the certificate shows the measured values, not the limits.
| Element | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti |
|---|---|---|---|---|---|---|---|---|
| Limit (max unless range, wt%) | 0.40 | 0.40 | 0.10 | 0.40–1.00 | 4.00–4.90 | 0.05–0.25 | 0.25 | 0.15 |
Source: ASTM B209 / ASTM B928; EN 573-3 (EN AW-5083); GB/T 3190. The certificate prints the actual heat-analysis values; compare them to these limits.
Magnesium (4.00–4.90%) and manganese are the strengtheners; copper is kept very low (≤0.10%). A certificate showing Mg below 4.00% or above 4.90% means the heat is not 5083-reject it.
Mechanical properties of 5083-H116 aluminum plate
For plate up to 6.35 mm (the thin band of ASTM B928), 5083-H116 carries these minimum values. The certificate reports the actual tested results; each must meet or exceed the minimum.
| Temper | Thickness | UTS min (MPa) | Yield min (MPa) | Elong. min (%) |
|---|---|---|---|---|
| H116 | ≤ 6.35 mm | 303 | 214 | 12 |
| H321 (reference) | ≤ 6.35 mm | 317 | 228 | 12 |
Source: ASTM B928M mechanical-properties table (minimum values by thickness and temper); EN 485-2 for European equivalents.
Read the certificate carefully: it lists actual results. A real 5083-H116 plate will show UTS at or above 303 MPa and yield at or above 214 MPa. Values below the minimum mean the lot fails the specification.
Certification and stamping of the 5083-H116 aluminum plate
The closing block carries the authorized inspector's signature (and, for 3.2, the independent inspector's signature), the manufacturer's stamp, and-for classed material-the class-society endorsement and approval number. The physical plates are also stamped or etched at the edge with the heat number and plate number. The certificate is only valid if those stamped numbers can be tied back to the document, which leads directly to the heat-number cross-check.
| Field on the MTC | What it shows | What to verify for 5083-H116 |
|---|---|---|
| Certificate No. & date | Unique document ID and issue date | Matches your order; not reused or undated |
| EN 10204 type | 3.1 or 3.2 | 3.1 = mill-certified actual results; 3.2 = independently witnessed |
| Standard(s) | ASTM B928 / B209, EN 573-3, EN 485-2, GB/T 3880 | Confirms which spec the values are judged against |
| Material / grade | EN AW-5083, temper H116 | Exactly 5083-H116, not H321 or O |
| Dimensions | Thickness × width × length | Matches PO; thickness within tolerance band |
| Quantity & weight | Pieces, kg | Matches packing list and scale weight |
| Heat / Lot No. | Cast and batch identity | Matches the stamp on each plate |
| Chemical analysis | Actual Si/Fe/Cu/Mn/Mg/Cr/Zn/Ti | Within limits (Mg 4.00–4.90%, Cu ≤0.10%) |
| Mechanical results | Rm / Rp0.2 / A% | ≥ minimums (Rm 303, Rp0.2 214, A 12 for H116) |
| Signature & stamp | Authorized + (for 3.2) independent inspector | Real signatures/stamp, not a copy |
| Class endorsement | CCS / ABS / DNV approval no., thickness range | Covers 5083-H116 at your thickness |
Heat and lot number cross-reference for 5083-H116 aluminum plate
The heat number is the single most important identifier on a mill certificate. It ties a specific cast of aluminum to every plate rolled from it. The lot number groups a shipment. To confirm the paper matches the metal, cross-check these four points before the container is released:
MTC heat number = plate stamp. Each 5083-H116 plate is stamped or etched at its edge with the heat number. The number on the certificate must be identical to the number on the physical plate.
MTC plate number = bundle label. The individual plate or coil number on the certificate should appear on the bundle tag so a single plate can be pulled and verified.
MTC dimensions = measured dimensions. Spot-check a plate's thickness and width against the certificate; thin edges are common and worth catching early.
MTC class approval = your thickness. The approval referenced must cover 5083-H116 at the thickness you ordered.
| Document / object | Identifier | Must agree with |
|---|---|---|
| Mill certificate | Heat No. H23-XXXX | Plate edge stamp |
| Plate edge | Stamped heat + plate No. | Certificate heat & plate No. |
| Bundle tag | Plate No., dims, heat No. | Certificate & packing list |
| Packing list | Qty, weight, heat No. | Certificate & B/L |
A reliable supplier will hand you a three-way check sheet-stamp photo + MTC + heat number-before the container leaves. If the heat number on the certificate cannot be found on the plate, stop and resolve it; a surveyor will catch the same mismatch and can halt a shipway.
Third-party re-inspection options for 5083-H116 aluminum plate
If the order is high-value, first-time, or going into a classed vessel, you can add independent verification on top of the EN 10204 3.1 mill certificate. Common options:
| Option | What it adds | When to use it |
|---|---|---|
| EN 10204 3.2 | Independent inspector witnesses/signs the certificate; tests may be re-witnessed | Contract or class society demands witnessed documentation |
| SGS / BV / TÜV inspection at mill | Independent sampling and test witnessing before shipment | First order, large volume, or critical application |
| Pre-shipment inspection (PSI) at port | Quantity, packing, and marking verification at the container | Full-container or consolidated shipments |
| PMI / on-arrival testing | Positive material identification and re-test on site | When you cannot rely on the paper alone |
| Additional mechanical re-test | Cut sample retested for strength and elongation | Dispute, or safety-critical use |
GNEE ships every 5083-H116 aluminum plate order with an EN 10204 3.1 mill certificate as standard, and can arrange 3.2 certification and SGS / BV / TÜV inspection or pre-shipment witness on request. Tell us at the quotation stage so the lead time and cost are built in.
Traceability process for 5083-H116 aluminum plate
Traceability is the chain that lets you prove, years later, exactly which cast a plate came from and that it was tested. For 5083-H116 marine aluminum plate the chain runs like this:
| Stage | Record created | Ties the material to |
|---|---|---|
| Casting | Heat No. | The chemistry is born and logged |
| Hot rolling | Plate / coil No. | Heat No. → physical form |
| Inspection | Mill certificate (3.1) | Plate No. ↔ Heat No. with test results |
| Stamping | Edge mark on plate | Physical link to the certificate |
| Packing | Bundle label & packing list | Heat No., dimensions, quantity |
| Class endorsement | Approval reference | Grade × temper × thickness range |
| Delivery | Bill of lading | The lot to its destination |
Because the heat number appears at every step-cast, plate, certificate, stamp, bundle, and bill of lading-a single identifier can reconstruct the whole history of any plate. Keep the mill certificate with the project file; it is the document your surveyor and insurer will ask for if anything is ever questioned.
check on a 5083-H116 aluminum mill certificate
A few patterns mean the certificate-or the material-cannot be trusted. Watch for:
Heat number missing or not stamped on the plate. No stamped number means no way to tie paper to metal.
Temper mismatch. Certificate says H116 but the plate stamp says H321 or O.
Chemistry out of limit. Magnesium below 4.00% or above 4.90%, or copper above 0.10%.
Mechanical below minimum. UTS under 303 MPa or yield under 214 MPa for H116 thin plate.
Approval gap. The class approval covers only thick plate, not your 4–6 mm thickness.
"3.2" with no independent signature. A 3.2 without a second, independent inspector's signature is not a real 3.2.
Editable or altered values. A certificate that looks like numbers were changed, or arrives as an unlocked editable file.
No class-society approval for marine use. When the plate is for a classed vessel, absence of any society endorsement is a blocker.
Price and lead time for 5083-H116 aluminum plate
GNEE quotes 5083-H116 marine aluminum plate case by case. The price tracks the SMM (Shanghai Nonferrous Metals) aluminum price plus a conversion and certification margin, so the per-kg price on the day depends on the SMM base, your thickness, surface, and documentation. We do not publish a fixed list price because the SMM base moves daily.
MOQ - flexible: small trial orders are accepted, and large-volume, full-container, or annual-contract orders are welcome; larger orders are preferred.
Lead time - typically 15–30 days depending on whether the size is from stock, rolled to order, or cut and processed.
Certificate - every shipment ships with an EN 10204 3.1 mill certificate; 3.2 and third-party inspection (SGS / BV / TÜV) can be arranged.
Reply time - we respond to quotation requests within 24 hours.
Price is benchmarked to SMM. Conversion margin, thickness, and certification are quoted per order.
About GNEE
GNEE has supplied aluminum products to international buyers since 2008 and currently exports to more than 100 countries and regions. Our marine-grade line includes 5083-H116 aluminum plate, available for export, shipped with EN 10204 3.1 mill certificates and class-society documentation arranged on request. We handle flexible order sizes-small trial lots and large-volume or annual-contract orders alike-with typical lead times of 15–30 days and a 24-hour quotation response. For buyers specifying marine plate, our team supplies the stamp-photo + MTC + heat-number check sheet, the class-society coverage table for your thickness, and can arrange SGS / BV / TÜV inspection or EN 10204 3.2 so your surveyor can verify every heat without surprises.
FAQ
What is the difference between EN 10204 3.1 and 3.2?
Both report the actual test results for a specific heat of aluminum plate. A 3.1 is certified by the mill's own authorized inspector. A 3.2 adds an independent party-the purchaser's or an agreed inspection agent-who witnesses or verifies the tests and signs the certificate. For most 5083-H116 marine orders a genuine EN 10204 3.1 is sufficient; request 3.2 only when your class society or contract requires witnessed documentation.
What should a 5083-H116 mill certificate include?
At minimum it must name the material as 5083-H116 and the standard it is judged against (ASTM B928 / B209, EN 573-3, EN 485-2, or GB/T 3880), carry the heat and plate numbers, report the actual chemical analysis and mechanical results against the limits in the field table above, bear the inspector's signature and mill stamp, and-for classed marine use-show a class-society endorsement that covers 5083-H116 at your thickness. The single non-negotiable check is that the heat number on the certificate matches the number stamped on the plate.
How do I match the heat number on the certificate to the plate?
Each 5083-H116 plate is stamped or etched at its edge with the heat number. Confirm that the heat number on the mill certificate is identical to the stamped number, that the plate number on the certificate matches the bundle tag, and that the dimensions and class approval match your order. A three-way check sheet (stamp photo + MTC + heat number) closes the loop before shipment.
Does 5083-H116 aluminum plate need CCS approval for marine use?
If the plate goes into a classed vessel or offshore structure, yes-it should fall under a class-society material approval (CCS, ABS, DNV, LR, BV, or another IACS society) that covers 5083-H116 at your thickness. The approval number and approved thickness range should appear on or with the mill certificate. 5083 is a 5xxx Al–Mg alloy and is not on the Chinese dual-use export-control list, so 5083-H116 plate itself is freely available for export; the approval is a class requirement, not an export restriction.
Can I arrange third-party inspection for 5083-H116 plate?
Yes. Beyond the standard EN 10204 3.1 mill certificate, you can request EN 10204 3.2, SGS / BV / TÜV inspection at the mill, pre-shipment inspection at the port, on-arrival PMI testing, or an additional mechanical re-test. Tell the supplier at the quotation stage so the inspection is scheduled into the lead time.
Request a 5083-H116 aluminum plate quote with EN 10204 3.1 MTC