Nickel 200 ASTM B161 Seamless Nickel Pipe

Nickel 200 pipe, UNS N02200, is the commercially pure wrought nickel grade that has served the chemical process industry for decades in the applications where alloyed stainless steels fail: hot caustic solutions, dry chlorine, and reducing chemicals. Its specification basis is ASTM B161 for seamless pipe and tube. The alloy is distinguished not by alloying but by purity - nickel content of at least 99.0 percent - which gives it a corrosion profile that stainless steel cannot imitate. 

Nickel 200 Pipe Material Specification

ASTM Specification	ASTM B161 ASME SB161, ASME SB-163
Standard	DIN, ASME, EN, JIS, GB, AISI, NF, DS, SAE, DTD, ASTM, AMS, TOCT,
Size of Seamless Pipe	Wall thickness.: 0.05- 20 milimeter, 4 - 219 milimeter
Size of Welded Pipe	5.0 to 1219.02 milimeter
size of EFW Pipe	5.0 to 1219.02 milimeter
Seamless Tube Size	3.35 milimeter To 101.6 milimeter OD
Welded Tube Size	6.35 milimeter To 152 milimeter OD
Tubing wall thickness	0.020" –0.220", (custom wall thicknesses available)
Pipe Schedule	SCH160, SCH40S, SCH30, SCH120, SCH20, SCH80, SCH60, SCH5, SCH10S, SCH40, SCH80, XXS, XS, SCH10, STD
Length	Standard & Cut length , Single Random, Double Random Pipe
Finish	AP (Annealed & Pickled), BA (Bright & Annealed), NO.1, 2B, Polished, MF, HL, NO.4, Mirror finish, BA, 8K etc
End	Plain End, Beveled End, Treaded Pipe, Screwed ends
Type	Seamless / ERW / EFW / Welded / Fabricated
Marking	Heat No. (Or as per need.), Thickness, OD, Grade, Standard Length
Value Added Service	Expansion and Draw as per needed Length and Size, , Polish (Comilimeterercial and Electro), Machining, Annealed & Pickled Bending Etc.
Specialize in	Large Diameter
Technique	Cold drawn, hot drawn, bright annealed, solid solution, hot extruding

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Chemical Composition: The Strength of Purity (ASTM B161 N02200)

Nickel 200 carries a minimum nickel content of 99.0 percent, with carbon held to 0.15 percent and every other element tightly limited. That near-pure nickel matrix is exactly what gives the alloy its two signature properties: immunity to caustic stress-corrosion cracking and excellent performance in reducing media.

 

Element	Composition, % (ASTM B161, N02200)	Engineering role
Ni	99.0 min	Matrix; caustic and reducing-media resistance
C	0.15 max	Controlled for fabricability
Mn	0.35 max	Deoxidation
Fe	0.40 max	Impurity limit
Si	0.35 max	Deoxidation
Cu	0.25 max	Impurity limit
S	0.010 max	Impurity limit

 

The carbon row is the one buyers should understand before ordering. Nickel 200 is fully weldable and formable, but its carbon content means the alloy is not recommended for service above roughly 315 °C, where graphitization can occur over long exposure. For higher-temperature caustic service, the low-carbon companion grade Nickel 201 (UNS N02201) is the correct specification, a distinction that appears repeatedly in corrosion literature and should appear on every procurement inquiry.

 

Mechanical Properties in the Annealed Condition

ASTM B161 specifies Nickel 200 pipe in several tempers; the annealed condition is the standard for corrosion service. Typical annealed room-temperature values are shown below.

 

Property	Typical value (annealed)	Notes
Tensile strength	380 – 550 MPa (55 – 80 ksi)	Annealed, per B161 temper system
Yield strength, 0.2% offset	105 – 275 MPa (15 – 40 ksi)	Annealed
Elongation in 50 mm	40 – 55%	Annealed; very ductile
Density	8.89 g/cm³	Approximate
Melting range	1435 – 1445 °C	Approximate

 

Nickel 200 is not bought for strength; its yield strength is modest compared with the alloyed nickels and stainless steels. It is bought for corrosion performance and for the exceptional ductility that makes it one of the easiest nickel alloys to fabricate, bend and weld. For pressure-retaining lines, allowable stress values are taken from ASME Section II-D Table 1A under N02200.

 

Corrosion Performance: The Service Envelope

The corrosion envelope of Nickel 200 pipe is defined by a small set of decisive environments:

 

• Caustic soda and caustic potash solutions at all concentrations up to the 315 °C service ceiling, where austenitic stainless steel suffers caustic stress-corrosion cracking.
• Dry chlorine and hydrogen chloride gas, where the pure nickel matrix resists attack that destroys stainless steel.
• Reducing media such as dilute non-oxidizing acids, where the absence of alloying elements prevents the localized attack that afflicts alloyed grades.
• Food and pharmaceutical processing where product purity demands a corrosion-resistant, non-contaminating surface.

 

The boundary is equally clear: Nickel 200 is not for oxidizing media. Hot nitric acid, oxidizing salts and aerated sulfuric acid attack the alloy rapidly, and in those services the chromium-bearing nickel alloys are the correct specification. Stating the medium and its oxidizing character on the enquiry prevents the classic misapplication.

 

Size Range, Schedules and Fabrication Notes

ASTM B161 covers seamless Nickel 200 pipe and tube from small instrument lines to large process lines, in schedules SCH 10S through SCH 80S and heavier. The dimensional tolerance system follows the nickel-alloy seamless pipe class with wall tolerance +20% / -12.5%. The alloy welds readily with matching nickel filler, no preheat is required, and its ductility makes it a forgiving material in the fabrication shop - bends, flanges and tube expansions are routine operations that on stainless steel demand far more care.

 

Applications and Industries

Installed Nickel 200 pipe is found in chlor-alkali plants and caustic evaporation circuits, chlorine handling systems, synthetic fiber production lines, magnetic and electronic component manufacturing, food processing, and any plant where hot caustic or dry chlorine moves through piping.

 

What to State on the Enquiry

Specify ASTM B161 UNS N02200 in the annealed condition, nominal size and schedule or explicit OD × wall, the certificate type (EN 10204 3.1 or 3.2), and the service temperature so the supplier can confirm the grade against the 315 °C graphitization limit - if the service exceeds that temperature, the enquiry should name Nickel 201 (N02201) instead. For pressure-retaining lines, request the ASME Section II-D Table 1A allowable stress basis for N02200.

 

Nickel 200 vs Nickel 201 vs 316L vs Monel 400: The Buying Decision

The procurement decision for caustic and reducing service usually compares four products.

 

Against 316L, Nickel 200 wins decisively in hot caustic, where stainless fails by cracking, but loses in oxidizing media and on price per kilogram.

 

Against Monel 400, Nickel 200 is the better choice in caustic and reducing media while Monel wins in seawater and hydrofluoric service.

 

Against Nickel 201, the choice is purely thermal: below roughly 315 °C either grade serves, and Nickel 200 is the standard economic pick; above it, only low-carbon Nickel 201 is safe. Matching the medium, temperature and oxidizing character to these boundaries is what separates a correct material choice from a premature failure.

 

Nickel 200 pipe is a mature, fully documented product: the chemistry and mechanical values above are verifiable against ASTM B161 and ASME SB-161, and every certified heat carries the analysis and test record that project acceptance requires.

 

 

 

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