Remarking of Steel Plates after Cutting

How do you know if a cut plate is actually genuine?

A lot of our customers are concerned about this, and so I thought I’d share how this is demonstrated.

Mill Marking of Plates

The mill marks plates when they roll them to enable traceability and to authenticate them.

marked steel

Here is a 100mm S355 plate being profiled in our warehouse in April. The mill marking can be seen in the top centre overlapping both profile outlines.

In the case of Dillinger plates the mill markings are usually:

  • Steel designation
  • Heat number
  • Trademark (shown below)
  • Rolled Plate Number/Test Number
  • Inspector’s stamp

Dillinger HütteWhen you cut the plate one piece will have the mill marking and one won’t. The piece without a mill marking is useless for engineering purposes. There is no way to determine the physical or chemical characteristics without destructive testing. You can’t even identify the origin.

So in order for plates to be cut you have to be able to transfer the mill markings. Who can do this?

Quality Assurance of Marking

The original marking was done under the mill’s ISO 9001 or equivalent quality system. Similarly any transfer of markings needs to be done under and approved quality system by the stockholder doing the transfer. So as a result of our ISO 9001 quality system we can provide assurance that we do this process correctly.

However for plates at the mill that have to be independently inspected – for example thick structural plates or the pressure vessel plates which are certified to EN 10204 3.2 – the situation is more complicated.

The independent inspection at the mill includes inspection of the plate marking. So to transfer markings on 3.2 plates you need to have them independently verified.

marked steel

This is the transferred mill marking. Note the use of the Ancofer Logo to indicate who is responsible for the heat transfer

Third Party Verification of Marking Transfers

There are two ways of doing this:

First, you pay for a Lloyds or ABS inspector to come to the site and verify the transfer. This can be very expensive and it can cause shipment delays as you wait for them to visit.

Alternatively you get the classification society to certify your marking transfer process.

This means that Lloyds or ABS certifies your organisation as being competent to transfer the markings from plate to another based on your underlying quality system AND additional supporting documents and processes.

We are approved by Lloyds Register to remark plates and transfer heat numbers. This free service saves you time and money.

This also provides assurance through the length of the supply chain, that the plates you buy are correctly marked and deliver the high performance and improved weldability that Dillinger plates are known for.

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