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

Request a batch-linked material certificate or test report, a clear material and heat-treatment requirement from a drawing or purchase order, and a record that the exact offered batch meets that requirement. A material name, a hardness value or a supplier statement is not enough.

Kazakhstan abrasive mining conditions make undercarriage parts wear-critical. But the mining application is only a reason to be strict about evidence; it does not by itself prove that a compatible part has the same metallurgy, manufacturing quality or service life.

1. Separate the material claim from the fitment claim

A supplier may say the part fits and uses the same material. Fitment and material acceptance are different questions. Model, serial number, old part number, component photos, installation position and catalogue revision help identify the part. They do not confirm batch quality, heat treatment or authenticity.

Material designation alone is not enough

A material designation may show only a composition family or a named grade. It does not confirm how the part was processed, whether the supplied heat or batch matches that designation, or whether it meets the applicable SANY drawing or purchasing requirement.

Hardness alone is not enough

Hardness is a useful check, but it can be local and may be produced by different heat-treatment routes. The same hardness number does not prove equivalent hardenability, case depth, core properties, microstructure, toughness or wear life.

2. Request evidence that is linked to the offered batch

Ask for documents that can be traced to the exact parts being offered, not to another customer order or another production batch.

Material document

Request a batch-linked material certificate or test report. Check who issued it, what specification or requirement it states, and whether the heat number, batch number or lot number can be matched to the offered parts.

Manufacturing statement

Ask which drawing revision or purchase-order requirement defines the accepted material, heat treatment and test criteria. A statement like 'same as original' is not a requirement unless the supplier can show the original or applicable requirement being used.

Heat-treatment record

Request the actual heat-treatment record for the batch. It should state the process used and show whether the result meets the specified acceptance condition. Do not accept a general description of heat treatment as proof.

Relevant test evidence

If the specification requires chemical composition, mechanical properties, hardness traverse, case depth, microstructure or other tests, request those results with acceptance limits. The test evidence matters only when it is required by the applicable drawing or purchase requirement.

Verify the issuer and scope

Check whether the test report or certificate comes from an independent or accredited laboratory for the claimed test method, or only from the supplier's own unverified statement. Ask for the scope of the document and the batch it covers.

3. Missing evidence means the claim is not yet proven

If the supplier provides only a material name, a hardness value, a brochure page or a verbal statement, the equivalence claim is incomplete.

Common missing links

• No heat, batch or lot number that connects the document to the offered parts.
• No named drawing, revision or purchase-order requirement.
• No acceptance limits for the reported results.
• No issuer or scope information for the test document.
• No evidence that the sampled parts represent the whole batch.

These gaps are reasons to ask for clarification, not reasons to accept equivalence.

4. Keep provenance, sample results and batch acceptance separate

A photo or label can help identify the part, but it does not prove material. A test result from one sample does not automatically prove the whole batch. A certificate from an earlier order does not prove the next order. Keep these categories separate when reviewing supplier documents.

5. Procurement next step

Send a short evidence request before purchase. Identify the exact undercarriage part using model/suffix, serial number, old part number, component or housing photos, installation position and relevant catalogue revision if available.

Then ask the supplier:

• Provide a batch-linked material certificate or test report for the exact parts offered.
• State the drawing revision or purchase-order requirement used for material, heat treatment and acceptance.
• Provide the batch heat-treatment record and test results with acceptance limits.
• Confirm which independent or accredited issuer performed the tests, and the item/batch link.

If the supplier cannot provide this, treat the same-material claim as unverified. You may still procure the part, but the decision should be based on documented risk, not on an unsupported equivalence claim.

Sources

No external standards, supplier certificates, catalogue pages or manufacturer documents were inspected for this article. The guidance is a process check for evidence that should be requested before acceptance.