Nickel Tube & Pipe — 镍管 / 镍管

Product Overview

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

Nickel Tube & Pipe — 镍管 / 镍管

If you are moving caustic, hydrofluoric acid, or hot alkaline liquor, a {nickel_tubes} nickel tube outlasts 316L stainless by orders of magnitude — in boiling 50% NaOH a nickel tube keeps its wall where stainless would be eaten through in a single season, and in anhydrous HF a {monel400_pump} Monel 400 tube is one of the very few materials that simply works. We stock {ni200_pipe_stock} Ni200 / Ni201 and Monel 400 tubes in Baoji, cut to length and shipped worldwide with full mill certificate, so you can specify the grade for the fluid instead of guessing. This guide answers what each grade does, which standard applies, where nickel tube actually fails, and how to write an RFQ that returns a usable quote instead of a guessing game.

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 Tube & Pipe

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

A {nickel_tubes} nickel tube is a hollow, long product supplied seamless (drawn or extruded) or welded, in commercially pure nickel (Ni200 / Ni201) or the nickel-copper alloy Monel 400. It carries corrosive fluids that would destroy carbon steel and 300-series stainless in months. The grade, not the word “nickel,” decides whether the tube survives — which is why this guide leads with selection, not with a catalogue. A tube is only as good as the line around it, so we treat tube, {nickel_fitting_forming} fittings and {nickel_flange_page} flange as one grade system.

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 Tube & Pipe 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 (and why).
• Spec — ASTM B161 (seamless), B163 (exchanger), B165 (Monel), B725/B730 (welded).
• Size — OD, wall, length, quantity; U-bend or straight.
• Condition — annealed, bright, pickled; tolerance class.
• Ends — plain, bevelled (B16.25), expanded, or flanged.
• Certificate — EN 10204 3.1 MTC with heat number.
• Service — medium, concentration, temperature, pressure.
• Packing — VCI, crate, port of destination.

4. Nickel Tube & Pipe Forms, Sizes & What to Specify

5. Standard & Certification You Receive

Every {nickel_sheet_mtc} nickel tube we ship carries an EN 10204 3.1 mill test certificate with heat-number traceability to the actual melt, to the relevant ASTM specification. Seamless exchanger tubes are supplied annealed with the tighter OD tolerance B163 demands; welded pipe is offered where cost matters and the service is non-critical. Ask for PMI or hydrostatic test on the order if your code requires it — both are routine, not special. For project work we also supply the matching {ni200_pipe} nickel pipe and the {nickel_flange_page} flange from one heat where practical.

6. The “Nickel Is Just Expensive Steel” Myth

The trap is treating nickel like “expensive steel.” Steel fails in caustic and is destroyed by HF; nickel is specified because those are its best services. Conversely, nickel is not a universal corrosion material — put it in nitric acid or wet chlorine and it fails fast, exactly where {ti_tube_guide} titanium or Hastelloy would hold. The grade and the medium, not the price tag, decide the outcome, so the first question on any RFQ should be “what fluid, at what concentration and temperature?” not “send me nickel tube.”

7. Where Nickel Tube & Pipe DOES Fail — Limitation & Failure Conditions

Nickel tube limits are set by the alloy, not the shape. The table below is the same for every nickel form; read it before you specify, then come back to the tube-specific sizing notes.

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 soda, alkaline or high-purity reducing service → Ni200 / Ni201 ({ni200_vs_ni201}).
• High-temperature caustic above ~315°C → Ni201 (low carbon).
• Food, pharma or colour-critical reducing lines → Ni200 / Ni201.

Choose that if:

• Seawater, brine or coastal atmosphere → Monel 400 ({monel400_pump}).
• Hydrofluoric acid, any concentration → Monel 400 (rare, proven material).
• Need strength plus corrosion → Monel K500 ({monel_k500_vs_400}).
• Oxidising or mixed acid → step to Hastelloy C-276 / Inconel, not nickel.

9. Common Procurement Mistakes

• Specifying “nickel” without the grade — Ni200 and Ni201 are not interchangeable above 315°C.
• Using Ni200 in high-temperature caustic — carbon graphite-embrittles the wall.
• Putting Monel in mercury service — absolute exclusion, rapid failure.
• Assuming nickel beats stainless everywhere — in oxidising acid it is worse.
• Forgetting the MTC — without heat traceability you cannot prove the grade at audit.

10. Lead Time, MOQ & Export Packing

Standard {ni200_pipe_stock} Ni200 / Ni201 and Monel 400 tubes are cut and dispatched from Baoji stock, often the same week. Non-standard OD, heavy wall, U-bends, or Monel K500 take a few weeks, not mill lead times, because we hold the raw stock. Small MOQ applies — you are not forced into a minimum-lot penalty for a single spool, and we can cut exact lengths so you pay for metal you use, not offcut scrap. See our {ni_tube_sel} tube selection guide for a fuller size matrix.

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 Tube & Pipe, 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 Tube & Pipe

Which nickel grade for caustic soda tube?

Use Ni201 for caustic above about 315 degC to avoid graphite embrittlement of Ni200; Ni200 is fine for lower-temperature alkaline and reducing service. Both resist caustic far better than stainless.

Can nickel tube handle hydrofluoric acid?

Yes. Monel 400 is one of the few engineering alloys that resists hydrofluoric acid across concentrations, and pure nickel also resists HF. Exclude mercury and keep HF de-aerated where practicable; never substitute 300-series stainless.

Seamless or welded nickel tube?

Seamless (B161 / B163) for exchangers and critical process lines; welded (B725 / B730) for general transfer where cost matters. We stock both and cut to length.

Why did my Monel tube crack?

Usually mercury contact, moist aerated HF vapour, or stress in anhydrous ammonia. Monel is excellent in seawater and HF but has hard exclusions; review the service against the limitation table before reordering.

What certificate comes with the tube?

An EN 10204 3.1 mill test certificate with heat-number traceability to the actual melt, to the relevant ASTM grade. PMI or hydrostatic test can be added on the order.

Do you export worldwide?

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

Can I kit tube with fittings and flanges?

Yes. Because we stock the full nickel family, we kit a consistent line (Ni201 or Monel tube, B366 fittings, B564 flange, fasteners) from one shipment so grade and certificate stay matched end to end.

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.