A supplier may hold an ISO 9001 certificate, but a purchase decision also needs product-specific evidence. ISO 9001 is a quality management system standard. It does not replace the flange standard, the material specification or the inspection record for an individual order.
Check the certificate itself
Confirm the certified legal entity, site address, scope of activities, certificate number, issuing body and validity dates. If an order is placed with a different legal entity or made at a different site, ask how that location is covered. Hyupshin lists its certificates on the certificate page; verify the current document for the scope relevant to your purchase. The ISO 9001 standard page explains the management-system requirements.
Then check the flange specification
For a forged flange, state the product standard and edition, flange type, nominal size, pressure class or PN rating, facing, material grade and any bore or pipe-schedule requirement. A drawing or item list helps identify dimensions and project-specific deviations. ISO 9001 certification does not establish that a flange conforms to ASME B16.5, EN 1092-1 or another product standard. That must be checked against the supplied product and the contract requirements.
Request records for the actual order
Specify whether you need a material test certificate, heat-number traceability, dimensional inspection report, coating record, marking details or third-party witness inspection. Identify the document type and inspection scope in the RFQ so the supplier can confirm availability before production. Compare the material designation and heat number on the certificate with the markings and packing list. If the supplied documents do not match the ordered grade, size or standard, resolve the discrepancy before acceptance.
Practical RFQ sequence
Attach the drawing or item list; identify the standard, material, sizes, ratings and quantities; list the required certificates and inspection records; then ask for price, lead time and delivery terms. Use the product pages to review available flange types and send the RFQ with the documents you already have.