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Incoloy 800 (UNS N08800 / W.Nr. 1.4876 / NS111) is a nickel-iron-chromium alloy used in high-temperature furnaces, reformers, and nuclear secondary-side heat exchangers. Because it is often specified for pressure equipment, high-value assets, or safety-related components, buying on price alone is risky. A qualified supplier must prove not only that the material isIncoloy 800, but that every piece you receive is traceable to a specific melt with verified chemistry and properties. Below is a practical checklist for procurement and QA/QC teams when evaluating Incoloy 800 vendors.
What a Proper Incoloy 800 Mill Test Certificate (MTC) Must Show
Per EN 10204 3.1 (or 3.2 if third-party witnessed), the MTC is the primary document proving material conformity. It should contain:
|
MTC Field |
What to Verify |
|---|---|
|
Heat / Cast Number |
Unique furnace number stamped on every plate, bar end, or pipe — must match the MTC exactly. |
|
Material Grade |
Clearly stated as UNS N08800 / W.Nr. 1.4876 / NS111 (not just "800" handwritten). |
|
Chemical Analysis (Full Melt) |
Ni 30.0–35.0%, Cr 19.0–23.0%, Fe ≥39.5%, C ≤0.10%, Al 0.15–0.60%, Ti 0.15–0.60%, S ≤0.015%, etc. All elements within ASTM B409/B407/B408 ranges. |
|
Mechanical Properties |
Tensile strength ≥520 MPa, Yield ≥205 MPa, Elongation ≥30% — values from actual tensile coupon of the heat, not generic typical values. |
|
Heat Treatment |
Stated as "Solution Annealed" with temperature range (typically 980–1050°C for 800). For 800H/800HT, confirm higher soak temp and grain size ≥ ASTM 5. |
|
Product Form & Dimensions |
Matches your PO — e.g., Plate 12×1500×6000mm, or Seamless Tube 25.4×2.11mm. |
|
Issuance & Signature |
Dated, with authorized signatory of the melt shop / stockist; EN 10204 3.2 additionally signed by an independent inspecting body (SGS / TÜV / BV / DNV). |
|
Standard Reference |
ASTM B409/B408/B407 (or ASME SA equivalents) and applicable edition year. |
???? Red Flag: Supplier offers only a "commercial invoice + generic spec sheet" or an MTC with copied/pasted typical values instead of actual heat-analysis numbers → reject or demand proper 3.1 cert.
Material Traceability: The 3-Point Verification Rule
Traceability means you can link the finished product back to its original ingot/cake through documented records. When auditing a supplier, apply these three checks:
Stamp & Tag Match
Each piece (plate corner stamp, bar end tag, pipe bundle tag) must bear the same heat numbershown on the MTC. For cut pieces, the supplier should re-tag sub-pieces with the original heat number + unique sub-ID and cross-reference them in a delivery note.
Chain of Custody Documents
Ask: Can the supplier show the mill's original melt certificate → stockist's certificate of conformity → your delivered MTC? For imported material (VDM, ATI, Sandvik), the original mill MTC should be retainable even if the local stockist issues a 3.1 re-cert.
PMI Cross-Check (On Request)
A reputable vendor can perform Positive Material Identification (XRF or OES) on your lot — verifying Ni ~32%, Cr ~21%, Fe ~balance — and provide a printed PMI report. This is especially important if you've had alloy mix-up issues in past purchases.
Additional Quality & Inspection Questions to Ask Your Supplier
Do you stock dual-certified 800H/800HT? If your project involves >593°C creep design, you'll need N08810/N08811 — confirm C ≥0.05%, Al+Ti ≥0.85% (for HT), and coarse grain (ASTM 5+) on the cert.
Can you arrange UT/PT/ET and third-party inspection? (UT per ASTM A388 for bars/forgings; Eddy Current per ASTM E426 for tubes; SGS/TÜV witness if specified in the spec.)
What is your policy on non-conforming material? Qualified suppliers have a written NCR (Non-Conformance Report) process and will replace mis-supplied material at their cost.
Are you a stockist or a trader? Stock-holding distributors (like Shanghai COCESS) can show you the physical material, allow inspection prior to shipment, and release faster than pure traders who must drop-ship blind.
Why These Checks Matter for Incoloy 800 Projects
Code Compliance: ASME Section VIII / Section I and most national pressure equipment regs require traceable MTCs for pressure parts — no MTC = no approval.
Mixed-Alloy Risk: Incoloy 800 can look identical to 304/316 or even 321 SS visually; without PMI + MTC you risk installing wrong alloy in high-temp service → premature failure.
Upgrade Clarity: Confusing 800 with 800H/800HT in a creep-governed design can cause under-design of allowable stress — only the cert proves you got what the design engineer specified.
Shanghai COCESS Special Alloys Co., Ltd. (Shanghai Kesaishi Special Alloy) supplies Incoloy 800 (UNS N08800), 800H (N08810), and 800HT (N08811) in plate, round bar, forged block, and seamless pipe — all with EN 10204 3.1 MTC, full heat traceability, and optional PMI / UT / third-party inspection. We welcome on-site material inspection prior to shipment.
Send us your RFQ with grade, dimensions, quantity, and certification level — we typically respond with stock status and formal quotation within one working day.
Website: https://en.cocessalloys.com
Email: sales@cocessalloys.com
