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Shanghai COCESS Special Alloys Co., Ltd supplies Incoloy 20 (Alloy 20 / UNS N08020 / W.Nr. 2.4660 / NS143) directly from qualified Chinese specialty steel mills and our own bonded warehouse in Shanghai. By sourcing VIM/AOD-refined billets and cutting out unnecessary middlemen, we offer factory-direct pricing on Incoloy 20 round bar, plate, sheet, seamless pipe, welded pipe, flange and forged fittings—with full EN 10204 3.1 MTC, PMI verification and optional third-party inspection (SGS/BV/TÜV). We serve chemical plant EPCs, pharmaceutical equipment fabricators, and acid-handling system contractors worldwide.
What Is Incoloy 20 (UNS N08020)?
Incoloy 20 is a niobium-stabilized austenitic nickel-iron-chromium alloy containing 3–4% copper and 2–3% molybdenum. The copper addition gives it strong resistance to hot sulfuric acid; the niobium ties up carbon to prevent intergranular corrosion after welding—post-weld solution anneal is normally not required. It sits between 316L stainless and high-nickel alloys like Alloy C276 in both cost and corrosion performance, making it the economical choice for sulfuric/phosphoric acid service.
Chemical composition (wt%, ASTM B463 / B473):
Ni: 32.0 – 38.0 | Cr: 19.0 – 21.0 | Fe: Balance
Mo: 2.0 – 3.0 | Cu: 3.0 – 4.0 | C: ≤ 0.07
Nb + Ta: ≥ 8×%C, max 1.00
Mn ≤ 2.00 | Si ≤ 1.00 | P ≤ 0.045 | S ≤ 0.035
Mechanical properties (solution annealed, min. per ASTM):
Tensile Strength (Rm): ≥ 551 MPa (80 ksi)
Yield Strength (Rp0.2): ≥ 241 MPa (35 ksi)
Elongation (A, 50mm): ≥ 30%
Hardness: ≤ 217 HB / ≤ 95 HRB
Density: 8.08 g/cm³ | Melting Range: 1370–1430 °C
Corrosion highlights:
Excellent in sulfuric acid (10–80%, especially 20–40% boiling range with oxidizers)
Good resistance to phosphoric acid, nitric acid and chloride pitting/crevice corrosion
Virtually immune to chloride-induced stress corrosion cracking (SCC) due to >32% Ni
Weldable with ERNiCrMo-3 (Inconel 625 type) filler; Nb-stabilized — as-welded condition acceptable for most services
Incoloy 20 Products & Size Range From COCESS
We keep regular stock in Shanghai and arrange direct mill shipments for oversize or non-standard items. All material is solution-annealed and pickled/passivated before dispatch.
|
Product Form |
Typical Size / Range |
ASTM / ASME Standard |
|---|---|---|
|
Round Bar / Forged Bar |
Dia. 12–300 mm (up to 500 mm on request), black or turned & polished, length 2–6 m |
ASTM B473 / B472 |
|
Hot Rolled Plate |
Thk. 6–60 mm, W 1000–2000 mm, L 2000–6000 mm |
ASTM B463 / SB463 |
|
Cold Rolled Sheet / Coil |
Thk. 0.5–6.0 mm, W ≤ 1000 mm |
ASTM B463 / A240 |
|
Seamless Pipe / Tube |
OD 10–219 mm (1/2"–8"), WT 1.5–12 mm, random or cut length |
ASTM B729 / SB729 |
|
Welded Pipe |
Per customer schedule, OD up to 1000 mm |
ASTM B464 / B775 |
|
Flanges & Fittings |
WN / SO / Blind flange DN15–DN600 (ASME B16.5 / HG/T), elbow/tee/reducer (B366 WP20) |
ASTM B366 / B462 |
Every lot ships with original Mill Test Certificate (EN 10204 3.1). UT, PT, PMI and intergranular corrosion test (ASTM G28 Method A) can be arranged prior to loading.
Typical Applications of UNS N08020
Chemical Processing: Sulfuric & phosphoric acid storage tanks, heat exchanger shells, acid transfer lines, nitration units
Pharmaceutical & Food: Fermentation tanks, acid dosing lines where media purity + corrosion resistance matter
Pickling & Surface Treatment: Heating coils, baskets and hooks in steel pickling lines (hot H₂SO₄ service)
FGD & Environmental: Flue gas desulfurization spray headers, scrubber internals
Select Offshore / Sour Service: Components in mildly sour, acidic chloride environments (material suitability check recommended per NACE MR0175)
Why Buy Incoloy 20 Direct From COCESS?
Factory-Direct Pricing — We source from audited Chinese specialty steelworks with long-term allocation agreements; no trading markup layered in.
Stock + Mill Flexibility — Common sizes ship from Shanghai warehouse (often same week); non-stock or large-diameter items scheduled direct from mill with heat number traceability.
One-Stop Packing List — Round bar, plate, pipe and matching flanges/fittings quoted and shipped on one invoice to simplify import paperwork.
Value-Added Options — Saw cut to length, water-jet/plasma plate cutting, rough machining of flanges or tube sheets per drawing, surface pickling & passivation.
Export Documentation — Commercial Invoice, Packing List, CO (Form A/E), MTC 3.1, optional SGS/BV inspection report; seaworthy export crating as standard.
Technical Backup — Grade cross-reference (UNS N08020 ↔ NS143 ↔ 2.4660 ↔ Carpenter 20Cb-3), welding filler recommendation, corrosion-fit discussion for your process media.
Request Stock Check & Quotation
Please send your inquiry stating:
Product form (bar / plate / pipe / flange / fitting)
Dimension(s) and quantity (kg or pcs)
Required tests / certification (PMI, UT, G28, NACE, etc.)
???? Email: sales@cocessalloys.com
???? Web: https://en.cocessalloys.com
