Discover the latest trends and innovations in the nickel alloy industry. We provide expert insights and in-depth analysis on the newest developments in nickel alloys.
Shanghai COCESS Special Alloys Co., Ltd. (Shanghai Kesaishi Special Alloy) supplies High Purity Incoloy 800HT (UNS N08811 / W.Nr. 1.4959 / X8NiCrAlTi32-21) in plate, sheet, round bar, forged block, and seamless pipe — all solution-annealed ≥ 1149°C with controlled coarse grain (≥ ASTM 5), strictly processed from selected Ni-Fe-Cr melt stock to minimize detrimental trace impurities (S ≤ 0.015%, low Pb/Sn/Bi). Every shipment is backed by EN 10204 3.1 Mill Test Certificate with full melt chemical analysis, room-temperature mechanical values, heat treatment record, and grain size verification — and can be upgraded to EN 10204 3.2 with third-party inspection (SGS / TÜV / BV / DNV). PMI verification (XRF/OES) is performed before despatch to guarantee you receive genuine UNS N08811 material.
What "High Purity" Means for Incoloy 800HT (N08811)
While Incoloy 800HT is not a vacuum-remelt superalloy, "high purity" in commercial Ni-Fe-Cr alloy context refers to:
Tight Melt Chemistry Control: Ni 30.0–35.0%, Cr 19.0–23.0%, Fe ≥ 39.5%, C 0.06–0.10%, Al 0.25–0.60%, Ti 0.25–0.60%, Al+Ti = 0.85–1.20% — intentionally controlled to promote γ′ (Ni₃(Al,Ti)) precipitation and grain-boundary carbide pinning.
Low Residual / Tramp Elements: S ≤ 0.015%, P ≤ 0.020%, Pb/Sn/Bi typically < 0.001% (not deliberately added, routinely below detection in qualified melts) to avoid high-temp embrittlement.
Clean Steel Practice: ESR/VAR not required for 800HT per spec, but our cooperating mills apply ladle refining + slag practices to reduce non-metallic inclusions — beneficial for long-term creep ductility and uniform carburization resistance.
Coarse, Uniform Grain Structure: Solution annealed ≥ 1149°C, water-quenched or rapidly air-cooled → ASTM grain size 5–3 (coarse), verified on sample coupon and reported on MTC.
Full Material Test Certificate (MTC) — What You Receive as Standard
Per EN 10204 3.1 (default with every order):
|
MTC Field |
Detailed Content |
|---|---|
|
Heat / Cast Number |
Unique furnace number, physically stamped / tagged on each piece; sub-piece IDs cross-referenced on delivery note |
|
Material Grade |
Stated as UNS N08811 / W.Nr.1.4959 / ASTM B409-B564; dual cert. to N08810 (800H) available |
|
Chemical Analysis (Full Melt) |
Ni, Cr, Fe, C, Mn, Si, S, P, Al, Ti — actual values from spectrometer, not "typical" ranges |
|
Mechanical Properties |
Tensile Strength Rm ≥ 450 MPa, Yield Rp0.2 ≥ 170 MPa, Elongation A ≥ 30% — actual test coupon values |
|
Heat Treatment |
"Solution Annealed at [Temp]°C for [Time], quenched" — confirms ≥ 1149°C soak |
|
Grain Size |
Reported per ASTM E112 (typically ≥ ASTM 5) |
|
Product Form & Dim. |
Matches your PO — e.g., Plate 12×1500×6000mm, Seamless Tube 25.4×2.11mm |
|
Signature & Date |
Authorized QC signatory of melt shop / stockist |
→ EN 10204 3.2 available on request: independently witnessed and signed by appointed inspection agency (SGS / TÜV / BV / CCS / DNV).
Stock Forms, Purity Assurance & Traceability
|
Product Form |
Typical Stock / Supply Range |
Standard |
|---|---|---|
|
Plate / Sheet |
CR: Thk 0.5–6.0 mm; HR Plate: Thk 6–50 mm (up to 80 mm on request); W 1000–2000 mm; L 2000–6000 mm |
ASTM B409 / SB409 |
|
Round Bar / Forged Rod |
HR Bar: Φ8–Φ200 mm; Forged: Φ200–Φ350 mm (larger by custom forging) |
ASTM B408 / B564 (N08811) |
|
Seamless Pipe / Tube |
OD: Φ6–Φ219 mm; WT: 1.0–12 mm; HX tubes per ASTM B163, process pipe per ASTM B407 |
ASTM B407 / B163 / SB407 |
|
Forged Disc / Flange Blank / Ring |
By drawing (up to ~1500 mm O.D.) |
ASTM B564 (UNS N08811) |
PMI Check (Standard): 100% lot verification by XRF/OES — confirms Ni ≈ 32%, Cr ≈ 21%, Fe = balance, Al+Ti detectable — guards against mix-up with 304/316 SS or lower-grade 800.
NDT Options: UT per ASTM A388 (bars/forgings, typically Grade II); Eddy Current per ASTM E426 / Hydrostatic (tubes); PT/MT on machined faces if specified.
Traceability: Heat number on MTC ↔ physical tag on material ↔ sub-piece tag after cutting ↔ packing list — full closed-loop.
Typical Applications Requiring Certified High-Purity 800HT
Ethylene pyrolysis (cracker) furnace radiant tubes — creep + carburization at 800–950°C
Steam Methane Reformer (SMR) catalyst tubes & outlet pigtails — 760–930°C H₂+CO atmosphere
Secondary reformer transition pieces (ammonia / hydrogen plants)
High-temp carburizing / nitro-carburizing furnace muffles, hangers, radiant screens
Creep-critical pressure piping > 760°C where N08800/N08810 are insufficient
Request Incoloy 800HT Stock List & Formal Quotation
Please advise:
Grade (800HT or Dual Cert. 800H/HT) + Form (Plate / Bar / Pipe / Forging) + Dimensions (Thk or Dia or OD×WT) + Qty + Destination Port + Certification Level (3.1 or 3.2, TPI if required) + Any NDT (UT, ET, PMI)
Website: https://en.cocessalloys.com
Email: sales@cocessalloys.com
