Sourcing specialty alloys from China: a 10-point buyer checklist

The 10-point checklist

• 1. Lead with the full designation: UNS number + EN number + product standard (e.g. N08825 / 2.4858 / ASTM B424). A supplier who answers with the correct standard knows the product; one who answers with a photo of stainless plate does not.
• 2. Demand an EN 10204 3.1 mill test certificate tied to the heat number — not a generic certificate with the grade name but no heat identity.
• 3. Verify the heat number is stamped on the physical material and matches the certificate. Photographs of stamps beat PDFs.
• 4. Ask which mill produced the melt. A trading company that cannot name the mill cannot solve a quality dispute.
• 5. For critical duties, request an independent third-party test (SGS, TÜV, BV) on a sample from your lot — the cost is trivial next to a shutdown.
• 6. Confirm mechanical-property testing was done on the actual heat, with the test direction relevant to your product (transverse for plate, longitudinal for bar).
• 7. If the service is sour oilfield, require written NACE MR0175 / ISO 15156 compliance with hardness values, not just a compliance sentence.
• 8. Ask what they cannot do. Suppliers who claim every grade in every size are resellers with wide tolerances on the truth.
• 9. Agree rework and rejection terms before production: what happens on failure of PMI, UT or mechanical tests, and who pays freight both ways.
• 10. Start with a pilot order even if you need tonnes later. A 300 kg trial reveals more than ten email exchanges.

Red flags

• Price dramatically below the LME-linked market level for the alloy family.
• Certificate chemistry matches the standard exactly, every element, every time — real melts scatter.
• Reluctance to provide heat-number photos, video of the marking, or a live video call from the warehouse.
• 'Yes' to every question. Real manufacturers say 'we order that in' or 'not our line' regularly.

Documents to demand with every shipment

• EN 10204 3.1 MTC with heat chemistry and mechanicals
• Dimension report against your tolerance table
• PMI (positive material identification) report for each heat, if specified
• UT report for plate and forgings above your thickness threshold
• Heat-treatment charts where solution annealing or ageing is specified

How we work at Hangbo

We quote only what our mills genuinely produce, certificate the heat to EN 10204 3.1 as standard, and welcome third-party inspection before shipment. If a duty is outside our range we say so and often point you to the right family anyway — a customer saved from a bad buy today becomes the enquiry we quote tomorrow.