A Key Move in a Large Steel Casting Factory Audit: Ask for the Drawing, Heat Number and NDT Report On the Spot

When an overseas buyer audits a supplier of large steel castings, the decisive test is rarely a review of the certificate pack.More often it is a walk into the machining bay, a hand on a 30-ton casting still sitting on the table, and a request: “Bring me its drawing, heat number, NDT report ad route card. Now.A spot check like this tests the quality system a plant runs day to day. A file prepared for the visit says little about whether each order was actually made to its own approved drawing ad technical requirement

At Xintengfei, this is exactly the kind of detail we care about: records that can be pulled on the shop floor and matched back to the physical part.We have worked with FLSmidth, CITIC Heavy Industries and other buyers in China and overseas. The ability to supply large steel castings is not only a matter of pouring parts of tens or hundreds of tons. It is also a matter of whether production and quality records hold up when someone checks them.The five points below follow one casting through the plant, linking drawing, production, inspection and delivery records item by item. They are also the points worth testing in a supplier audit.

1. Dimensional report: from drawing requirement to measured result

Customer name, drawing number and revision, and product or heat number should be consistent with the corresponding inspection and acceptance records.When a customer sees “conforming,” they should also be able to see the actual measured values, the dimensional tolerances those values were judged against, and the basis for the decision. For a part still in process, in-process inspection and final acceptance need to be kept apart, with the current machining status made clear.A pass conclusion only carries weight once you can see how it was reached.

2. NDT reports: the report has to reconstruct the test that was actually run

“Level 1 NDT” on its own is not enough. The report should state which standard was applied, which areas were tested, and what acceptance criteria were used.For ultrasonic testing, for example, the equipment, probe, reference block and sensitivity should all be recorded as they were for that specific test. If the customer looks closer, the answers need to be there: which probe was used? How was sensitivity set? Was the test surface prepared as required?

An NDT report also cannot stand in for confirmation of the upstream process and surface preparation. The method, coverage and acceptance level should correspond to the technical requirements of the order.

3. Defect disposition: keep the reasoning behind the decision

Photos should show where the defect is. Root cause analysis should trace back to the process step involved. Corrective action should name an owner, and quality, engineering and production should sign off through the defined procedure.Where an item requires customer approval, that approval should be kept on file.This is not a box-ticking exercise. It lets a later reviewer see where the problem was, why it was handled that way, and whether the repair was re-inspected afterwards.A disposition is traceable only when the reasoning and the record both exist.

4. Corrective action: did the fix hold, not just did it close

Adding the missing report solves the problem in front of you. Whether the action actually worked shows up in the next production lot.If the audit follows the trail into a later batch, the questions go further: was the corrective action carried out? Did anything get lost at shift handover? Has the same problem come backCorrective action therefore cannot stop at the document. It has to land on the process and the workstation, and later records have to confirm it worked.

5. Release records: say clearly what condition the part is in

Contract number, product number, heat number and other data on the paperwork should match the physical part and its inspection records.The records should also make clear whether the customer is receiving an as-cast part, a rough-machined part or a finish-machined part, and that this matches the contract.Collecting the documents before shipment is the baseline. The real test is whether the documents cross-check — which operations the part went through, which inspections it passed. That is what makes a release record meaningful.

Traceability in

large steel castings

comes down to records that match the shop floor

In the end, a system certificate, a pre-prepared sample file, or past supply history cannot replace the customer’s assessment of the order in hand.Xintengfei places weight on traceability through the manufacturing of large steel castings, and we welcome customers to check it against a specific order — drawing, heat number, production routing, inspection reports and delivery records.For buyers and quality engineers, an evidence trail that runs from the part to the records and back to the floor is what makes a supplier assessment concrete.Which part of an audit do you look at first: whether inspection records are genuine, how work is handed over between departments, or whether defect fixes actually prevent a repeat?

If you are sourcing or planning an audit, send us the drawing, material grade and inspection requirements, and we can discuss the project, the manufacturing route and the quality review.

Frequently asked questions

What documents should an auditor pull first at a large steel casting plant?

Start with one part on the floor. Check the physical marking, the current drawing, the heat number link, the production routing and the inspection records, then follow the order status into nonconformance handling and release documents. The main question is whether the documents match the part in front of you.

Does a heat number mean a casting can be fully traced?

The heat number is the key link to melting and material records, but full traceability also requires the product number, operation records and inspection reports. Where one heat is cast into several parts, the records still have to distinguish each part’s machining and inspection results.

If an NDT report says “Level 1,” does that meet the customer’s requirement?

That depends on the test method, the standard applied, the coverage and the acceptance criteria. Levels from different standards cannot be compared out of context. Whether a part meets the requirement is decided by the contract, the drawing and the technical documents agreed by both sides.