Nickel 200 / 201 (UNS N02200 / N02201): Instrumentation Fittings, Valves & Tubing
Nickel 200 and Nickel 201 are commercially pure wrought nickel alloys, about 99.6% nickel, designated UNS N02200 (200) and UNS N02201 (201), and specified above all for their outstanding resistance to caustic soda (sodium hydroxide) and other alkaline, chlorine and high-purity media. Crestflo supplies this grade family as instrumentation tube and compression fittings, instrumentation valves and instrumentation tubing, heat/lot-number traceable, engineered as drop-in replacements for the majors, and delivered US-serving in 6–8 weeks. The composition, mechanical and corrosion values below are standard published data for the alloys, per the applicable ASTM specifications and customizable to requirement.
> Scope: Nickel 200/201 here means the commercially pure wrought nickel alloys (UNS N02200 / N02201) used for fluid-system tube fittings, compression ferrules and instrumentation valves, not electroplating nickel, not nickel-plated steel, and not "200-series" (chromium-manganese) stainless steel. Crestflo offers these alloys in instrumentation fitting, valve and tubing forms only, not mill bar/sheet/plate/pipe.
Request a Nickel 200/201 Quote · Request a Sample · sales@crestflousa.com · +1 346 594 9005 (Houston, TX)
Nickel 200/201 Also Known As: UNS N02200/N02201, Alloy 200/201 & W.Nr. 2.4066/2.4068
On drawings, datasheets and purchase orders the same two grades are called out under a range of trade names and standard designations. Whether a print reads "Alloy 200," "CP nickel," "200 nickel," "pure nickel alloy" or "N02201 alloy," it refers to this one family of commercially pure wrought nickel, Nickel 200 in its standard-carbon form and Nickel 201 in its low-carbon form.
| Designation type | Nickel 200 | Nickel 201 |
|---|---|---|
| Common / trade names | Nickel 200, Alloy 200, Nickel Alloy 200, "200 nickel" | Nickel 201, Alloy 201, Nickel Alloy 201, "201 nickel" |
| UNS number | UNS N02200 (N02200) | UNS N02201 (N02201) |
| Werkstoff (W.Nr.) | 2.4066 (DIN / Werkstoff 2.4066) | 2.4068 (DIN / Werkstoff 2.4068) |
| DIN designation | Ni 99.2 | LC-Ni 99 (low-carbon) |
| Alloy family | Commercially pure (CP) wrought nickel | Low-carbon commercially pure wrought nickel |
| Descriptive forms | 99.6% pure nickel, wrought nickel, pure nickel alloy | Low-carbon 99.6% pure nickel |
UNS N02200 / N02201 (the US designations) and W.Nr. 2.4066 / 2.4068 (the European designations) describe the identical alloys, so a part specified either way is the same commercially pure nickel. The only deliberate chemical difference between the two grades is carbon content, which sets their temperature limits.
Nickel 200/201 Chemical Composition (Commercially Pure Nickel, per ASTM)
Both grades are nickel with only small, controlled residual elements; the defining variable is carbon, 0.15% maximum for Nickel 200 versus 0.02% maximum for low-carbon Nickel 201. That single difference is what separates general-service 200 from higher-temperature 201.
| Element | Nickel 200 (N02200) | Nickel 201 (N02201) |
|---|---|---|
| Nickel (Ni) + Cobalt | 99.0 min | 99.0 min |
| Carbon (C) | 0.15 max | 0.02 max (low-carbon) |
| Copper (Cu) | 0.25 max | 0.25 max |
| Iron (Fe) | 0.40 max | 0.40 max |
| Manganese (Mn) | 0.35 max | 0.35 max |
| Silicon (Si) | 0.35 max | 0.35 max |
| Sulfur (S) | 0.01 max | 0.01 max |
Values are per the applicable ASTM product-form specification (for example ASTM B160 for rod and bar); Crestflo confirms actual heat chemistry on the EN 10204 material test certificate supplied with every order. Typical nickel content runs to about 99.6%, well above the 99.0% minimum.
Nickel 200/201 Mechanical & Physical Properties (Density, Melting Point, Magnetic)
In the annealed condition commercially pure nickel is moderate in strength, highly ductile and easy to form, with high thermal and electrical conductivity and a ferromagnetic response. Values below are standard published ranges and nominal physical data for the alloys.
Mechanical properties (annealed, room temperature)
| Property | Nickel 200 | Nickel 201 |
|---|---|---|
| Tensile strength | ~55–75 ksi (380–517 MPa) | Slightly lower than 200 |
| Yield strength (0.2% offset) | ~15–30 ksi (103–207 MPa) | Lower than 200 |
| Elongation | ~40–55% | ~40–55% |
| Hardness | ~45–70 HRB (annealed) | Slightly lower than 200 |
Physical properties (both grades, nominal)
| Property | Value |
|---|---|
| Density | 8.89 g/cm³ (0.321 lb/in³) |
| Melting range | 1435–1446 °C (2615–2635 °F) |
| Thermal conductivity | High (a good conductor of heat) |
| Electrical conductivity | High (used in electrical/electronic parts) |
| Magnetic response | Ferromagnetic; Curie point ~360 °C (680 °F) |
| Structure | Face-centered cubic |
Mechanical values are typical annealed ranges; final certified properties for a given heat and product form are stated on the material test certificate. The lower carbon of Nickel 201 gives it marginally lower strength but better resistance to graphitisation at temperature.
Nickel 200/201 PREN: Why Pitting-Resistance Equivalent Does Not Apply
The pitting resistance equivalent number (PREN = Cr + 3.3 × Mo + 16 × N) is a chloride-pitting ranking index built for chromium-bearing stainless and nickel alloys. Commercially pure nickel contains no chromium, molybdenum or nitrogen, so PREN is not applicable to Nickel 200/201, the grade is chosen for caustic and alkaline resistance and electrical/thermal duty, not for oxidising chloride-pitting resistance. Where chloride pitting or oxidising acids are the design driver, a chromium-bearing alloy is the correct choice; for a cross-alloy view see the PREN comparison table and the corrosion-by-media × alloy matrix.
Nickel 200/201 Corrosion Resistance by Media (Caustic Soda, Chlorine & HF)
The flagship application for commercially pure nickel is caustic soda (sodium hydroxide) at all concentrations, including hot and molten, where it outperforms stainless and most other alloys. It also resists dry halogens and high-purity water, but is deliberately not an oxidising-service metal. The table summarises typical service suitability drawn from standard alloy corrosion literature.
| Media / condition | Suitability | Note |
|---|---|---|
| Caustic soda (NaOH), all concentrations incl. hot/molten | Excellent | The defining chlor-alkali application |
| Neutral & alkaline salts | Resistant | Broad alkaline service |
| Dry chlorine & dry hydrogen chloride (HCl gas) | Good | At moderate temperature |
| Fluorine & anhydrous hydrogen fluoride (HF) | Good | Dry/anhydrous halogen service |
| High-purity / distilled water, food, synthetic fibers | Excellent | Low product contamination |
| Reducing acids (dilute) | Moderate | Confirm concentration and temperature |
| Oxidising acids (nitric, HNO₃) | Not recommended | Rapid attack |
| Oxidising salts (ferric / cupric chloride) | Not recommended | Oxidising ions attack the metal |
| Aerated / oxygenated ammoniacal solutions | Not recommended | Attacked in the presence of oxygen |
The single selection rule for commercially pure nickel: it excels in caustic and reducing/alkaline environments and corrodes in oxidising ones, nitric acid, ferric/cupric salts and aerated ammonia. For selection against a specific process stream see the material selection by service guide.
Nickel 200 vs Nickel 201: Which Grade to Choose (Temperature & Carbon)
Nickel 200 and Nickel 201 share the same corrosion behavior; the choice between them is governed by temperature and forming. Nickel 200 is the general-purpose grade for service up to about 315 °C (600 °F). Above that, the higher carbon of 200 can precipitate graphite and embrittle the metal, so low-carbon Nickel 201 is specified for higher temperatures, and 201's lower work-hardening rate also makes it the better choice for heavy cold-forming and spinning.
| Factor | Choose Nickel 200 | Choose Nickel 201 |
|---|---|---|
| Continuous service temperature | Up to ~315 °C / 600 °F | Above ~315 °C / 600 °F |
| Carbon content | 0.15% max | 0.02% max (avoids graphitisation) |
| Cold forming / spinning | Standard forming | Heavy forming, lower work-hardening |
| General ambient / caustic service | Preferred, well-understood | Also suitable |
In short: use Nickel 200 for general and caustic service to 600 °F, and low-carbon Nickel 201 where higher temperature or heavy forming is involved. Both are supplied by Crestflo in the same instrumentation forms.
Nickel 200/201 for Sour Service (NACE MR0175 / ISO 15156)
Commercially pure nickel is chosen for caustic and alkaline duty rather than H₂S sour gas, which is the province of chromium-bearing corrosion-resistant alloys. Any NACE MR0175 / ISO 15156 material qualification for a specific part is application-specific and governed by the hardness and material-condition limits in the standard; confirm the requirement for your service on the RFQ. See the NACE MR0175 and ISO 15156 standard pages, and, where H₂S is present, the sour-service selection guide for the correct alloy.
Nickel 200/201 Fabrication, Machining & Forming (Graphitisation)
Nickel 200/201 is supplied in the annealed condition, in which it is soft, ductile and readily formed, bent and cold-worked. Its principal fabrication caution is graphitisation, above about 315 °C (600 °F) the carbon in standard-carbon Nickel 200 can form graphite at grain boundaries and reduce ductility, which is exactly why low-carbon Nickel 201 exists for higher-temperature work. Commercially pure nickel is gummy and work-hardens, so it is machined at moderate speeds with sharp, rigid tooling and positive feeds. Crestflo forms and finishes Nickel 200/201 instrumentation parts to preserve the annealed condition, confirmed on the material certificate.
Nickel 200/201 Temperature & Pressure Suitability
The maximum continuous service temperature for standard-carbon Nickel 200 is about 315 °C (600 °F); low-carbon Nickel 201 is specified above that limit to avoid graphitisation. The pressure rating of a finished part is a function of product form and wall thickness, not of the grade itself, so working-pressure ratings are stated per the applicable standard on the individual tube-fitting, valve and tubing product pages, and are customizable to requirement.
Nickel 200/201 Product-Form Standards (ASTM B160–B163, B725, B730 & ASME SB-)
The alloys are covered by a family of ASTM specifications by product form, each with a corresponding ASME SB- designation. These educate the grade; Crestflo supplies the instrumentation forms (fittings, valves, tubing) built from certified material to these specifications, not the mill forms themselves.
| Product form | ASTM | ASME equivalent |
|---|---|---|
| Rod & bar | B160 | SB-160 |
| Seamless pipe & tube | B161 | SB-161 |
| Plate, sheet & strip | B162 | SB-162 |
| Seamless heat-exchanger tube | B163 | SB-163 |
| Welded pipe | B725 | SB-725 |
| Welded tube | B730 | SB-730 |
| Forgings | B564 | SB-564 |
| Wrought fittings | B366 | SB-366 |
Values and grades are per the applicable ASTM/ASME specification (W.Nr. 2.4066 / 2.4068 for the European route); material certificates accompany every order.
Nickel 200/201 Applications: Chlor-Alkali, Caustic Handling & High-Purity Systems
Commercially pure nickel is specified wherever caustic and high-purity service defeats stainless steel:
- Chlor-alkali and caustic soda production, evaporation, storage and transfer at all concentrations, including hot and molten NaOH.
- Chlorine and hydrogen-chloride handling in dry conditions, and fluorine / anhydrous HF service.
- Food, synthetic-fiber and high-purity water systems where low product contamination matters.
- Electrical and electronic components that exploit nickel's conductivity and magnetic properties.
In these plants Nickel 200/201 typically appears as the wetted material for instrument hook-ups, impulse lines, sampling systems and analyzer connections, the exact forms Crestflo builds. Serving petrochemical & chemical, food & beverage and pharmaceutical & biotech processing across the US.
Nickel 200/201 Product Forms from Crestflo: Fittings, Valves & Tubing
Crestflo supplies UNS N02200 / N02201 in three instrumentation product forms. This grade routes to compression and ferrule fittings, needle/ball/manifold valves, and seamless instrumentation tubing, pipe, plate, bar, sheet, wire and fasteners are feedstock or out of scope, not catalog forms.
- Nickel 200/201 tube & compression fittings, single and double ferrule (twin-ferrule), hardened or non-hardened ferrules, imperial and metric, end connections up to 2" (50 mm) OD; also specified as Nickel 200 compression fittings, alloy 200 ferrule fittings and UNS N02200 fittings. Compression tube fittings are performance-qualified per ASTM F1387.
- Nickel 200/201 instrumentation valves, needle, ball, check and 2/3/5-way manifold valves, sizes 1/16"–1". Valve pressure-boundary design follows ASME B16.34 with API seat-leak and test practice.
- Seamless Nickel 200/201 instrumentation tubing, seamless commercially pure nickel instrumentation tubing in imperial and metric OD/wall.
Every Crestflo Nickel 200/201 part carries a heat/lot number and ships with an EN 10204 material test certificate. Sizes, ferrule type and thread standard are configured to requirement, end connections include NPT (per ASME B1.20.1), tube-fitting, threaded, ISO 8434-2 flare and DIN 2353.
Why Crestflo for Nickel 200/201
We Engineer Confidence, and for a caustic-service alloy like commercially pure nickel that means PMI-verified chemistry, honest sourcing and real interchange, in extractable specs rather than a buried PDF.
- Drop-in interchange for Swagelok®, Parker®, Hoke® and Hy-Lok®, dimensional interchange, with compression fitting ends backed by ASTM F1387 performance qualification (interchange/equivalent parts, not "compatible/intermix"). Request your Swagelok®/Parker® cross-reference from our engineering team via the cross-reference page.
- Lead time 6–8 weeks versus 20+ weeks typical for the majors, see the lead-time capability.
- Full traceability, heat/lot number on every part, EN 10204 MTC 3.1 as standard (3.2 on request), PMI to confirm the material is genuinely N02200/N02201, plus in-house testing.
- Single & double ferrules (hardened or non-hardened), imperial and metric, on all fittings; small MOQ and private-label options.
- ISO 9001 / 14001 / 45001 & PED certified; in-house CNC / VMC / EDM machining.
- The heritage behind the brand: Crestflo is the instrumentation division of a four-decade-old, Government-of-India-recognized export house with a proven Middle-East delivery track record, new manufacturing, deep export pedigree. Read more about Crestflo.
Stock & delivery: ready stock for standard items · made-to-order for specials · 6–8 week delivery. Origin: Indian origin; US / European melt available on request, with full material traceability (origin & compliance).
Buyers: Request a Quote or Sample (end users, EPC, panel fabricators) · Talk to an engineer / send a print (equipment manufacturers, OEMs) · Become a distributor.
Nickel 200/201 FAQs
Is Nickel 200 pure nickel?
Yes, Nickel 200 (UNS N02200) is commercially pure wrought nickel, typically about 99.6% nickel (99.0% minimum), with only small controlled amounts of carbon, iron, manganese, copper, silicon and sulfur. See the composition table above for the full ASTM ranges.
What is the difference between Nickel 200 and Nickel 201?
The only deliberate difference is carbon: Nickel 201 is the low-carbon version (0.02% C max) of Nickel 200 (0.15% C max). The lower carbon prevents graphitisation and embrittlement above about 315 °C (600 °F), so Nickel 201 is used for higher-temperature service and heavy cold-forming, while Nickel 200 covers general service below 600 °F.
Is Nickel 200 the same as 200-series stainless steel?
No. Nickel 200 is commercially pure nickel (UNS N02200). "200-series stainless" refers to chromium-manganese austenitic stainless steels, a completely different material with a different composition and use.
What is the UNS and Werkstoff number for Nickel 200 and 201?
Nickel 200 is UNS N02200 / W.Nr. 2.4066; Nickel 201 is UNS N02201 / W.Nr. 2.4068. The US (UNS) and European (Werkstoff/DIN) designations describe the same alloys.
What is Nickel 200 used for?
Its flagship use is caustic soda (sodium hydroxide) handling at all concentrations, including hot and molten NaOH. It also serves dry chlorine and hydrogen chloride, fluorine and anhydrous HF, high-purity water, food and synthetic-fiber processing, and electrical/electronic parts.
What is the maximum temperature for Nickel 200?
About 315 °C (600 °F) for continuous service. Above that limit the carbon in standard-carbon Nickel 200 can graphitise and embrittle the metal, so low-carbon Nickel 201 is specified for higher temperatures.
Which media should Nickel 200 NOT be used in?
Oxidising environments, nitric acid, oxidising salts such as ferric or cupric chloride, and aerated (oxygen-bearing) ammoniacal solutions, where it corrodes. It is chosen for caustic, alkaline and reducing service, not oxidising service.
Does Crestflo supply Nickel 200/201 tube fittings and valves?
Yes, compression and tube fittings (single or double ferrule, up to 2" / 50 mm OD) and instrumentation valves (1/16"–1") in Nickel 200/201, in both imperial and metric sizes, with fitting ends performance-qualified per ASTM F1387 and valves designed to ASME B16.34.
Are Crestflo Nickel 200/201 fittings a drop-in replacement for Swagelok or Parker?
Crestflo compression fittings are dimensionally interchangeable and performance-qualified per ASTM F1387. Request your Swagelok® or Parker® cross-reference from the engineering team via the cross-reference page.
What certifications and traceability come with Crestflo Nickel 200/201 parts?
EN 10204 3.1 certificates are standard (3.2 on request), and every part carries a heat/lot number for full traceability, with PMI to confirm the alloy and testing per Crestflo's in-house QA regime. Crestflo is ISO 9001 / 14001 / 45001 & PED certified.
What is the price and lead time for Nickel 200/201 fittings?
Pricing is by quotation, there is no online cart. Ready stock for standard items, made-to-order for specials, with 6–8 week delivery. Standard product is of Indian origin; US/European melt is available on request with full traceability. Submit an RFQ with size, form, material and rating for a configured part number and price.
Related Alloys & Resources
- Monel 400 and Monel K-500, nickel-copper alloys for seawater and reducing acids, the next step up from commercially pure nickel.
- Inconel 600 and Inconel 625, nickel-chromium alloys for high-temperature and oxidising service.
- Inconel vs Monel and the corrosion-alloy matrix decision guides.
- Browse the full range from the materials hub, tube-fittings hub and instrumentation valves hub.
Request a Nickel 200/201 Quote
Send your form (fittings, valves or tubing), size, end connections and line conditions, and the Crestflo Engineering Team will return a configured part number, ratings and price.
Request a Quote · Request a Sample · Browse the materials hub sales@crestflousa.com · +1 346 594 9005 · Houston, TX
Datasheets & CAD available to customers on request. Reviewed by the Crestflo Engineering Team. Swagelok®, Parker®, Hoke® and Hy-Lok® are trademarks of their respective owners; Crestflo supplies equivalent UNS N02200 / N02201 material to the applicable ASTM specifications and is not affiliated with, endorsed by or sponsored by those companies.