Nickel Flange — 镍法兰 / 镍法兰

Product Overview

Reviewed and maintained by the Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd.

Nickel Flange — 镍法兰 / 镍法兰

A {nickel_flange_page} nickel flange is the joint that lets a caustic or seawater line be opened, inspected and re-sealed without leaving the grade, and it is where most nickel lines are actually won or lost — get the grade, class and face right and the joint lasts decades. We forge Ni200 / Ni201 and Monel 400 flanges to ASTM B564 with ASME B16.5 dimensions in Baoji, machined and shipped with full mill certificate, and we pair them with the {nickel_tubes} tube and {nickel_fitting_forming} fittings they meet. This guide covers which grade, which standard, where flanges fail, and how to write an RFQ that returns a usable quote.

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 caustic line is plate shells, tube bundles, bar-made flanges and B366 fittings from one grade system — specifying them consistently is what keeps a plant leak-free for decades. Below, this product gets its own section, then the shared failure map and one selection rule. For the other six families see our nickel products hub nickel products hub.

At a Glance: Nickel Flange

1. What 镍法兰 / 镍法兰 Actually Is (and Why Buyers Confuse It)

A nickel flange is a forged, machined disc that joins pipe, valve or vessel, in commercially pure nickel (Ni200 / Ni201) or Monel 400, made from forge stock to ASTM B564 with dimensions to ASME B16.5 (or B16.11 for small socket-weld). The grade — not the word “nickel” — decides the service, exactly as with every other nickel form, and the flange must match the {nickel_fitting_forming} fitting and {nickel_tubes} tube it bolts to.

2. Grade Quick-Reference — Ni200, Ni201, Monel 400

For the full nickel-family picture — Inconel, Hastelloy, Monel side by side — see our our nickel alloy guide. For the Ni200-vs-Ni201 caustic decision, see this comparison. If you also run titanium lines, our titanium titanium guide explains where each metal owns the service.

3. How to Read a Nickel Flange 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 — Ni200, Ni201 or Monel 400.
• Spec — ASTM B564 forging; dims ASME B16.5.
• Type — WN / SO / BL / SW.
• Size & class — DN/NPS, pressure class.
• Face — RF / FF / RTJ.
• Certificate — EN 10204 3.1 MTC, UT if needed.
• Service — medium, temperature, pressure.
• Packing — VCI, crate, port.

4. Nickel Flange Forms, Sizes & What to Specify

5. Standard & Certification You Receive

Each {nickel_flange_b564} flange is forged from B564 stock and machined to ASME B16.5 dimensions, shipped with an EN 10204 3.1 mill test certificate, heat-number traceable to the melt. Ultrasonic examination of the forging is available on request for pressure-class work, and we mark the grade, class and heat number on the flange so it is unambiguous at the spool lay-down yard.

6. The “Nickel Is Just Expensive Steel” Myth

The trap is buying a flange by size alone. A weld-neck in the wrong nickel grade fails exactly where the pipe would; Monel flanges are not universal — in oxidising acid or mercury they are the wrong call, and a raised-face flange still needs the right gasket and the right bolt. Specify grade, type, class and face so the joint is one consistent corrosion system, and pair it with {nickel_fastener_galling} nickel fasteners of the same grade.

7. Where Nickel Flange DOES Fail — Limitation & Failure Conditions

Flange limits follow the alloy, not the disc shape. The same limitation table applies to every nickel product form — read it before you specify. Add two joint-specific notes: pick the gasket for the medium, and avoid coupling nickel directly to a much nobler metal without isolation.

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

8. Choose by Service, Not by Habit

Choose this if:

• Caustic / alkaline joints → Ni200 / Ni201 ({ni200_vs_ni201}).
• High-temperature caustic above ~315°C → Ni201.
• Cost-sensitive joints → Ni200 / Ni201.

Choose that if:

• Seawater or HF joints → Monel 400 ({monel400_pump}).
• Brine, desalination flanges → Monel 400.
• Oxidising or mixed acid → step to Hastelloy C-276 / titanium, not nickel.
• Strength plus corrosion → Monel K500 ({monel_k500_vs_400}).

9. Common Procurement Mistakes

• Specifying “nickel flange” with no grade.
• Ni200 in hot caustic — graphite embrittlement; use Ni201.
• Monel flange in oxidising acid or mercury — exclusion.
• Wrong face or class vs the mating flange — leak at startup.
• No gasket / bolt specification — the joint, not the flange, fails.

10. Lead Time, MOQ & Export Packing

{nickel_flange_b564} Ni200 / Ni201 and Monel 400 flanges are forged and machined in Baoji in common sizes and classes, with non-standard sizes in a few weeks. Small MOQ applies — a few flanges is a normal order, and we kit them with the matching tube, fittings and {nickel_fastener_galling} fasteners so the whole joint is one grade.

11. Nickel vs the Alternatives — When NOT to Specify Nickel

12. Welding & Joining Note

Nickel and Monel weld readily by GTAW / GMAW / SMAW with the correct filler — ERNi-1 ERNi-1 for pure nickel, ENiCu-7 for Monel — but the stubborn NiO oxide must be cleaned first or fusion fails, and welding wire must be kept dry to avoid porosity. For tube and pipe we follow a qualified WPS WPS with argon back-purge; for bar and plate 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 and titanium together in Baoji Baoji, close to China’s Titanium Valley supply base, which means we can cut, forge and kit a mixed nickel 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 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: Nickel Flange, 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 — Nickel Flange

Ni200 or Ni201 flange for hot caustic?

For caustic above about 315 degC use Ni201 to avoid graphite embrittlement of Ni200; Ni200 suits lower-temperature alkaline duty. Both far outlast stainless in caustic.

Weld-neck or slip-on nickel flange?

Weld-neck for high-integrity, cyclic or high-pressure joints; slip-on for easier fit-up at lower cost. Match class and face to the mating flange.

Can Monel 400 flanges handle seawater?

Yes — Monel 400 resists chloride stress-corrosion cracking where stainless fails, so Monel flanges are common in seawater and brine service. Avoid oxidising chlorides and mercury.

What forging standard applies?

Flanges are forged from ASTM B564 stock and machined to ASME B16.5 dimensions, with EN 10204 3.1 MTC and UT on request.

What certificate comes with the flange?

EN 10204 3.1 mill test certificate, heat-number traceable to the melt, to ASTM B564; UT report available.

Do you export worldwide?

Yes. Baoji stock to global ports, VCI-packed, with full MTC and shipping documents.

Can flanges be kitted with tube and fittings?

Yes. We kit a consistent line (Ni201 or Monel tube, B366 fittings, B564 flange, fasteners) from one shipment so grade and certificate match.

Summary: One Rule Beats a Catalogue

If you take one thing from this guide, take this: specify the grade for the fluid, not just the word “nickel,” and treat every joint as a system. Ni200 / Ni201 for caustic and reducing service (Ni201 above ~315°C), Monel 400 for seawater, brine and hydrofluoric acid — and never nickel in oxidising acid, mercury, or wet chlorine. 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.