A supplier says a SANY-compatible undercarriage part uses the same material: what evidence should I request?

Direct answer: Request a batch-linked material certificate or inspection document, not just a material name. The document should state the exact material designation and standard/revision, heat or batch number, manufacturing route, heat-treatment record, test results, issuer and scope. It must be traceable to the exact parts offered and to the applicable SANY or customer drawing or purchasing specification. If any link is missing, request clarification rather than accept equivalence.

1. What to request from the supplier

Material designation and specification

A supplier statement that a part uses the same material can mean many different things. Request the exact material designation and the standard or specification it is supplied to, including the revision. Do not accept only a general family description such as wear-resistant steel or a claim that it is the same as original.

Batch-linked material document

Ask for a material certificate or inspection certificate for the specific heat or batch used in the parts being offered. It should show chemical composition and any required mechanical properties. The certificate must be linked to the part number, quantity and purchase order or delivery note. A generic certificate for another batch is not evidence for the parts in front of you.

Manufacturing statement

A compatible part may use the same nominal material but a different manufacturing route, such as casting instead of forging, or different rolling, welding or machining steps. Ask the supplier to state the manufacturing route and confirm that it matches the applicable drawing or purchasing requirement. In mining undercarriage components, manufacturing route can affect grain flow, cracking risk, residual stress and wear life.

Heat-treatment record

Heat treatment has a large effect on undercarriage performance. Request a batch-linked heat-treatment record that shows furnace or batch identification, date, procedure and positions, along with hardness measurements if the applicable requirement calls for them. Do not ask for a single invented parameter; ask for the record required by the drawing or purchasing specification.

Test evidence that matches the requirement

Ask for relevant test reports such as chemical analysis, hardness measurement or case-depth measurement only where the applicable drawing or purchasing specification requires them. Each report should state the test method, acceptance limits, sample identification, laboratory name and date. A single hardness number or a material name alone does not establish manufacturing equivalence, performance or service life.

2. Why the same material claim is not enough in abrasive mining

Kazakhstan mining conditions can include hard rock, abrasive slurry, dust, impact loading and wide temperature changes. Undercarriage parts can fail through abrasive wear, impact or fatigue. A material grade is only one part of that performance picture. Two parts with the same nominal material designation can behave differently if the manufacturing route, heat treatment or quality control is different.

Use the mining environment as context for the questions you ask, not as proof of required metallurgy. The supplier still needs to show evidence against a defined drawing or purchasing requirement.

3. Check the document issuer, scope and traceability

Issuer

Find out who issued the document. It may be a mill, an independent laboratory or the supplier quality department. Check whether the issuer is competent or accredited for the document or test type, and whether the document is signed, dated and controlled. If not clear, verify with the issuer.

Scope and item or batch link

Check that the document states the part number or drawing revision and the heat or batch number. Compare those details with the labels or markings on the parts being offered. Also check that the certificate covers the quantity supplied. If the certificate does not identify the batch or the item, it is not enough.

Applicable drawing or purchasing requirement

Ask the supplier which requirement the part is claimed to meet, such as a SANY drawing number and revision, a customer purchasing specification or a compatible part drawing. Without a defined requirement, the phrase same material is not testable.

Missing links require clarification

If the supplier cannot connect the material certificate, manufacturing statement, heat-treatment record or test report to the offered batch and to a defined requirement, stop the acceptance decision and ask for clarification. A photo or a supplier statement is not proof of every claim.

4. Keep part identity separate from material evidence

Identify fitment first

Model and serial number, nameplate information, old part number, component or housing photos, installation position, applicable catalogue revision and documented supersession can help identify the correct part. A model number alone never confirms fitment, batch quality or authenticity.

Then evaluate batch evidence separately

A label, photo or external appearance is not evidence of material quality. Keep part identity, provenance, sample results and batch acceptance separate so that one good document does not cover a different question.

5. Procurement next step

Send the supplier a short written request for the evidence set, covering the exact material designation and standard/revision, a batch-linked material certificate, manufacturing route statement, heat-treatment record, and any required test reports with method, acceptance limits, sample identification and laboratory details. Ask the supplier to reference the applicable drawing or purchasing specification.

If the supplier provides only a material name or a hardness value, request the missing links. Final acceptance can only be decided by the responsible parties using the applicable requirements.

6. Parts Matching Support

This independent platform does not certify material equivalence, authenticity or fitment. If you need help organising candidate-part documentation questions, MechLink is an external commercial service that may help collect model and serial number, old part number, component or housing photos, and relevant labels or records. It is not a materials certification body and does not certify material equivalence. Kazakhstan phone/WhatsApp: +77026412810.

Sources

No external technical documents, mill certificates, standards or SANY drawings were inspected for this general evidence checklist. The article is based on general procurement and documentation-control principles for aftermarket undercarriage parts.