Incoloy 800/800H & 825 Products — Incoloy 800/825

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Проверено и поддерживается инженерной командой Shaanxi Qianyi Tuoda Technology Co., Ltd.

Incoloy 800/800H & 825 Products — Incoloy 800/825 镍合金产品

If your equipment lives at high temperature in a furnace or sees sulfuric acid, Incoloy 800/800H and 825 are the nickel-iron-chromium alloys that bridge stainless and the pricier nickel-chromium grades. 800/800H (UNS N08800 / N08810) resist carburising and oxidising atmospheres to about 1100°C and stay strong through controlled carbon (800H/HT); 825 (UNS N08825) adds molybdenum and copper for sulfuric-acid and seawater service. We stock tube, plate, bar, fittings and flange in Baoji with full MTC, so you specify the alloy for the service. This guide covers what each grade does, which ASTM fits each form, where Incoloy fails, and how to RFQ it.

The reason a product guide beats a catalogue is simple: the seven nickel families (tube, plate, bar, wire, fittings, flange, fasteners) are not independent. A corrosive line is plate shells, tube bundles, bar-made shafts and fittings from one grade system — specifying them consistently is what keeps a plant leak-free for decades. Below, this alloy gets its own section, then the shared failure map and one selection rule. For the other alloys see our nickel alloy nickel alloy hub.

At a Glance: Incoloy 800/800H & 825 Products

1. What Incoloy 800/825 镍合金产品 Actually Is (and Why Buyers Confuse It)

Incoloy 800/800H and 825 are nickel-iron-chromium alloys. 800 (N08800) is about 33% nickel, 21% chromium and 46% iron; 800H/HT (N08810/N08811) raise the carbon for strength at temperature; 825 (N08825) is about 42% nickel with added molybdenum and copper. That iron content keeps cost down while the nickel-chromium matrix resists hot oxidising and carburising gas, and 825's copper-molybdenum mix resists sulfuric acid and seawater. We plan tube, fittings and flange from one grade system.

2. Grade Quick-Reference — Incoloy 800/800H vs 825

For the full nickel-family picture — Inconel, Hastelloy, Monel, Incoloy, Alloy 20 side by side — see our alloy matrix alloy fabrication matrix. If you also run titanium lines, our titanium titanium guide explains where each metal owns the service.

3. How to Read a Incoloy 800/800H & 825 Products RFQ

A usable quote starts with a usable request. Put these on the enquiry so we return price and lead time instead of questions:

• Grade — 800, 800H/HT or 825.
• Spec — B407 (800 tube), B423 (825 tube), B409 (plate), B408 (bar), B366 (fittings), B564 (flange).
• Size — OD / thickness / length / diameter, quantity.
• Condition — annealed (800) or solution-annealed (825); tolerance.
• Ends / flange — plain, bevelled, or forged.
• Certificate — EN 10204 3.1 MTC with heat number.
• Service — medium, temperature, whether welded in place.
• Packing — VCI, crate, port.

4. Incoloy 800/800H & 825 Products Forms, Sizes & What to Specify

5. Standard & Certification You Receive

Each lot ships with an EN 10204 3.1 mill test certificate, heat-number traceable, to ASTM B407/B409/B408 (or B423 for 825 tube) as applicable. Condition follows the spec, and PMI or UT can be added on the order. For fabrications we supply the matching fittings and flange so the weld stays in grade.

6. The “One Alloy Solves Everything” Myth

Incoloy is not “cheap Inconel.” 800 owns high-temperature structure but is weak in strong acid at low temperature; 825 owns sulfuric acid but is not for hydrochloric. For seawater pitting you may step to Inconel 625; for broad acid duty Hastelloy C-276. Match the grade to the medium.

7. Where Incoloy 800/800H & 825 Products DOES Fail — Limitation & Failure Conditions

Incoloy limits follow the alloy: 800 is a high-temperature structural grade, 825 is an acid/seawater grade. Read the shared high-nickel failure map, then the alloy-specific notes.

Two joint-specific notes. Pick the gasket for the actual medium, and avoid coupling the nickel alloy directly to a much nobler metal (graphite, platinum, passive titanium in oxidising service) without isolation — it can become the anode. Where the service is oxidising or mixed acid, step to Hastelloy C-276 or C-22 rather than pushing the alloy past its limit.

8. Choose by Service, Not by Habit

Choose this if:

• High-temp furnace / carburising / oxidising to ~1100°C → 800 or 800H/HT.
• Sulfuric acid, phosphoric acid → 825.
• Seawater + moderate temperature, SCC concern → 825.

Choose that if:

• Chloride pitting needed in marine → Inconel 625.
• Broad or strongly oxidising acid → Hastelloy C-276 / C-22.
• Hot oxidising with chloride → 625.
• Mild, room-temperature duty → 316L stainless is cheaper.

9. Common Procurement Mistakes

• Using 800 in sulfuric acid — weak; use 825.
• Using 825 in hydrochloric acid — attack; use Hastelloy.
• Picking 800 instead of 800H for creep service — lose high-temp strength.
• Welding without correct filler (ERNiCr-3 vs ERNiCrMo-3).
• No MTC on a pressure part.

10. Lead Time, MOQ & Export Packing

800/800H and 825 are held in Baoji across tube, plate, bar, fittings and flange, cut to size and dispatched quickly for standard sizes. Special tempers, heavy-wall tube or large forged flange lead a few weeks. Small MOQ applies throughout — one coil, a contoured plate or a set of flanges is a normal order, and we kit the whole line from one shipment.

11. Alloy vs the Alternatives — When NOT to Specify This Alloy

12. Welding & Joining Note

These nickel alloys weld readily by GTAW / GMAW / SMAW, but the stubborn oxide must be cleaned first or fusion fails, and welding wire must be kept dry to avoid porosity. For this family specify filler ERNiCr-3 for 800/800H and ERNiCrMo-3 for 825; follow a qualified WPS with argon back-purge on tube and pipe, and we supply the matching wire and forming notes so the weld stays in grade. Always confirm the filler matches the base grade on the RFQ.

13. Reading the Mill Test Certificate

Every lot ships with an EN 10204 3.1 EN 10204 3.1 MTC: grade and UNS, heat number, chemistry, tensile result, and the ASTM specification. Keep the heat number — it is your traceability link from the finished part back to the melt, and it is what lets an auditor confirm the grade years later. For project work ask for PMI or UT on the order so the certificate matches the actual piece.

14. Why a Baoji Titanium-Valley Stockist

We hold nickel alloys and titanium together in Baoji Baoji, close to China’s Titanium Valley supply base, which means we can cut, forge and kit a mixed line from one shipment instead of chasing several mills. That shortens lead time from mill-weeks to days and keeps one grade logic, one certificate pack, and one point of contact for your whole order. Our nickel buying guide explains the stock-holder model for overseas buyers.

15. A 5-Minute RFQ Template

Copy this into your enquiry and fill the blanks — it returns a quote, not a guessing game:

• Product: Incoloy 800/800H & 825 Products, grade ___
• Spec: ___ (ASTM / ASME)
• Size: ___ ; quantity ___
• Condition / finish: ___
• Certificate: EN 10204 3.1, UT/PMT if needed
• Service: medium ___, concentration ___, temperature ___, pressure ___
• Destination & packing: port ___, VCI / crate

Email it to [email protected] — we confirm stock and pricing within 24 hours, and can kit the whole line from one Baoji shipment so grade and certificate stay consistent end to end.

16. FAQ — Incoloy 800/800H & 825 Products

Incoloy 800 or 800H for a furnace tube?

Use 800 for general high-temperature oxidation; specify 800H or 800HT when you need creep strength at temperature, because its controlled carbon keeps the strength rating.

Can Incoloy 825 handle sulfuric acid?

Yes. Incoloy 825 was designed for sulfuric and phosphoric acid service and resists pitting and stress-corrosion cracking in those media far better than 316L.

What ASTM for Incoloy plate versus tube?

B409 for plate and sheet, B407 for 800 tube (B423 for 825 tube), B408 for bar, B366 for fittings and B564 for forged flange.

Why did 800 corrode in my acid line?

800 is a high-temperature grade, not an acid-grade; for sulfuric or phosphoric switch the wetted parts to 825.

What welding filler for Incoloy?

ERNiCr-3 for 800/800H and ERNiCrMo-3 for 825, with oxide cleaned and wire kept dry.

What certificate comes with the order?

EN 10204 3.1 MTC, heat-number traceable to the melt, to the relevant ASTM grade; PMI/UT on request.

Do you export worldwide?

Yes. Baoji stock to global ports, with VCI protection, crating and full MTC and shipping documents.

Summary: One Rule Beats a Catalogue

If you take one thing from this guide, take this: specify the alloy for the fluid, not just the word “nickel alloy,” and treat every joint as a system. Incoloy 800/800H & 825 Products is the right call for its service window — and never specify it where the limitation map says no. Send the checklist above to [email protected] or use the inquiry form — we confirm stock and pricing within 24 hours, and can kit plate, tube, bar, wire, fittings, flange and fasteners for your whole line from one Baoji shipment.