What Quality Documents Should Buyers Request for Custom Chute Liners?
For custom chute liners, the document package must prove that the delivered parts correspond to the approved order—not merely that the supplier owns a certificate template. Buyers should specify material traceability, dimensional results, process records, inspection evidence, nonconformance handling and packing identification before the purchase order is released.
This guide helps purchasing and quality teams build a proportionate document requirement. Not every small order needs every record, and a document title alone does not prove that the test or inspection applies to the delivered parts.
Document package by purchasing risk
| Order condition | Minimum useful evidence | Additional controls to consider |
|---|---|---|
| Repeat simple cut plate | Approved drawing, material identity, dimensional record, packing list | First-off photo or template fit when the structure has changed. |
| Critical replacement shutdown | Full traceability, key-dimension report, part map, marking and packing sequence | Witness points, trial fit and pre-shipment release. |
| Processed wear plate | Material certificate, hardness/test evidence, hole and profile inspection | Process qualification or heat-control records when specified. |
| Cast liner | Heat/batch traceability, chemistry and mechanical/hardness results as ordered | Heat-treatment records and NDT where required. |
| Safety- or contract-critical item | Project ITP and controlled acceptance criteria | Third-party inspection or purchaser witness. |
Start with the approved order baseline
The document index should identify purchase order, drawing number and revision, part number, quantity, material specification, inspection plan and approved deviations. Without this baseline, a complete-looking report can still describe the wrong revision.
Material certificate and traceability
ISO 10474:2013 defines types of inspection documents supplied to purchasers for steel-product delivery, in accordance with the order. ISO 404:2013 covers general technical delivery requirements for steel products and states that agreed order or product-standard requirements take precedence when they differ.
State the required document type and traceability level instead of requesting a vague “MTC.” The certificate should link the heat, plate or batch to the finished liner markings. When parts are nested from a parent plate, define how traceability survives cutting, machining, painting and packing.
Chemical, mechanical and hardness results
Specify which results are required by the material standard and which are additional purchaser tests. ASTM’s current A370-26 covers mechanical testing of steel products and emphasizes that the relevant product specification or contract controls sampling, specimen location, orientation and reporting.
A reported hardness number needs a method, scale, location and acceptance range. See the wear-plate hardness testing guide for HBW/HRC planning and portable tester limitations.
Dimensional inspection report
List characteristics that affect interchangeability rather than writing “dimensions OK.” Typical items include overall profile, thickness, hole coordinates, slot orientation, countersink geometry, bend angle/radius, curvature and mating interfaces. The report should show actual values or a justified gauge result against the correct drawing revision.
Inspection and test plan
An ITP identifies activities, acceptance criteria, responsibility and hold, witness or review points. Agree it before production so neither party expects an inspection that was never priced or scheduled. The ITP should reference controlled procedures and records rather than repeating marketing claims.
Process records
| Process | Possible record when specified | Reason |
|---|---|---|
| Heat treatment | Furnace cycle, batch identity and temperature record | Links the process to required properties. |
| Welding/stud welding | Applicable WPS/PQR, operator qualification and inspection | Controls a special process that cannot be fully verified by final dimensions. |
| Machining | First-off inspection and controlled feature report | Confirms critical holes, recesses and interfaces. |
| Coating | System, surface preparation and dry-film result if ordered | Confirms corrosion-protection scope. |
| Part marking | Marking map and photographs | Maintains traceability and installation sequence. |
NDT reports and personnel qualification
If magnetic, penetrant, ultrasonic or other NDT is required, the order should identify method, procedure, examination area and acceptance criteria. ISO 9712:2021 specifies qualification and certification requirements for personnel performing several industrial NDT methods. The relevant construction or product code still needs to define how the examination is performed and accepted.
Laboratory competence
When independent testing is required, specify whether the laboratory must be accredited for the exact method. ISO/IEC 17025:2017 covers competence, impartiality and consistent operation of testing and calibration laboratories. A laboratory’s general accreditation does not automatically cover every test; review its scope.
Visual evidence without overclaiming
Pre-shipment photographs can show part number, overall condition, critical features, quantity and packing. They are supporting evidence, not substitutes for measurements or traceability. Use a shot list tied to part numbers and avoid presenting unrelated factory photographs as evidence for the order.
Nonconformance and deviation records
Require written disposition when a characteristic does not meet the controlled requirement. The record should identify the affected parts, requirement, actual result, proposed action and purchaser approval where needed. Do not silently revise a drawing after production to make a result appear conforming.
Check certificate identity and authenticity
A certificate should identify its issuer, date, product or batch, page count and authorization. Compare heat numbers and part markings with the packing evidence rather than reviewing the PDF in isolation. If a mill, laboratory or third party provides a verification channel, agree whether the buyer needs that confirmation. Scanned signatures and logos alone do not establish traceability.
Create a controlled electronic document register
Use consistent filenames that include purchase order, part or heat number, document type and revision. The final register should show required, submitted, reviewed and accepted status, together with open exceptions. Prevent superseded drawings or certificates from remaining in the release package without clear cancellation marking.
Packing list, marking map and release note
Heavy multi-part liner sets need package number, part number, quantity, net/gross mass and installation sequence. Match the packing list to physical markings and drawings. A release note should state that the required inspections and documents are complete, subject to any listed exceptions.
Document register for the RFQ
| Document | Required? | Review timing | Acceptance basis |
|---|---|---|---|
| Approved drawing/revision list | Normally yes | Before production | Purchaser approval. |
| Material inspection document | By material/order | Before shipment | Specified document type and traceability. |
| Dimensional report | For critical custom parts | Before release | Drawing characteristics and tolerances. |
| Process/NDT records | When contractually required | During and after production | Approved procedure and code. |
| Photos, marking map, packing list | Recommended for export replacement sets | Before shipment | Part and package identity. |
Buyer RFQ checklist
- purchase specification, drawings and revision-control rule;
- material document type and traceability method;
- key characteristics and sampling frequency;
- ITP hold/witness points and third-party involvement;
- NDT, personnel and laboratory requirements;
- nonconformance approval process;
- electronic file naming, language and submission timing;
- part marking, packing map and pre-shipment release.
See the pre-shipment inspection checklist, marking and packing guide, and quality-control capability page. Send the drawings and document register for a scope-aware quotation.
Technical review boundary
This article summarizes document-planning considerations and does not reproduce controlled standards. Updated by the EB China engineering-content team against the cited ISO and ASTM scope information. The purchase order, applicable material/product standard and approved ITP govern the deliverables.