Nickel 201 - UNS N02201

Alloy 201, UNS N02201, is commonly associated with ASTM B160 - ASTM B161 - ASTM B162 - ASTM B366 - ASTM B564 - ASTM B622.
Alloy 201 is commonly known as Nickel 201 or Ni201. Alloy 201 is a commercially pure Nickel alloy with lower Carbon content than alloy 200.
Mechanical properties here.


Ni C Mn Cu S Si Fe
Max % 0.02 0.35 0.25 0.01 0.35 0.40
Min % 99.0

Typical Inventory

Round Bar, Plate, Tubing, Pipe, Fastener

Product Description

The Nickel 201 alloys is an alloy that contains commercially pure wrought Nickel and has good mechanical properties that extend over a wide range of temperatures. The nickel alloy 201, also known as ni201, has excellent resistance to many corrosives, hydroxides in particular.

Nickel 201 has native properties to provide strong resistance to corrosion in acids and alkalis. It is especially useful under reducing conditions. The alloy has outstanding resistance to caustic alkalis, which includes its molten state. The alloy shows good resistance in acid, alkaline, and neutral salt solutions. However, when Nickel 201 is in oxidizing salt solutions severe corrosion will occur. The Nickel 201 alloy is resistant to all dry gases at room temperature. In dry chlorine and hydrogen chloride, Nickel 201 alloy may be used in temperatures up to 550C. Its resistance to mineral acids varies according to temperature, concentration, and solution aeration. Its corrosion resistance displays better in de-aerated acid.

General Data

  • Nickel 201 displays good corrosion resistance in acids and alkalis and is most useful under reducing conditions.
  • Outstanding resistance to caustic alkalis, which includes its molten state. The alloy shows good resistance in acid, alkaline, and neutral salt solutions.
  • Caution: in oxidizing salt solutions, severe corrosion will occur with this alloys
  • This alloy is virtually immune to inter granular attack above 315C. However, chlorates must be kept to a minimum.


  • Manufacture and handling of sodium hydroxide, particularly at temperature above 300C.
  • Production of viscose rayon. Manufacturing of soap.
  • Analine hydrochloride production and in the chlorination of aliphatic hydrocarbons such as benzene, methane and ethane.
  • Manufacturing of vinyl chloride monomer.
  • Reactors and vessels in which fluorine is generated and reacted with hydrocarbons

Physical Properties

Density 8.9 g/cm cube
Specific Heat 440 J/kg K
Electrical Resistivity 8.5 micro ohms cm
Curie Temperature 358 C
Melting Range 1435-1445 C
Thermal Expansion (106K) 14.3 (20-300 C)

Mechanical Properties

The typical properties listed can usually be provided in rounds, sheet, strip, plate, & custom forgings. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs.

MP Table 1
Type Ultimate Tensile (ksi) Yield Strength (ksi) Elong. % in 2 in.
Min Cold Worked 50 10 40
MP Table 2
Yield Strength Rp 0.2%
20 C Temp 80 N/mm sq
100 C 70 N/mm sq
200 C 65 N/mm sq
300 C 60 N/mm sq
400 C 55 N/mm sq
Tensile Strength RM
45N/mm sq
Elongation A5 min

Common Specifications

Please, note that the specs listed are for reference and are not comprehensive nor indicative of the actual specifications listed on the Material Test Report (MTR). If you have a special spec requirement, then please reach out to our sales department at 1-800-472-5569.

Form Standard
Metal Type UNS N02201
Bar ASTM B160
Sheet ASTM B162
Plate ASTM B162
Pipe ASTM B622, ASTM B161
Tube ASTM B622, ASTM B161, ASTM B163
Fitting ASTM B366
Forging ASTM B564
Weld Wire
Weld Electrode ENi-1
Din 2.4068


Nickel and cobalt based alloys can be difficult to machinine. However, it should be emphasized that these alloys can be machined using conventional production methods at satisfactory rates. These alloys harden rapidly, generate high heat during cutting, weld to the cutting tool surface and offer high resistance to metal removal because of their high shear strengths. The following are key points which should be considered during machining operations:

  • CAPACITY - Machine should be rigid and overpowered as much as possible.
  • RIGIDITY - Work piece and tool should be held rigid. Minimize tool overhang.
  • TOOL SHARPNESS - Make sure tools are sharp at all times. Change to sharpened tools at regular intervals rather than out of necessity. A 0.015 inch wear land is considered a dull tool.
  • TOOLS - Use positive rake angle tools for most machining operations. Negative rake angle tools can be considered for intermittent cuts and heavy stock removal. Carbide-tipped tools are suggested for most applications. High speed tools can be used, with lower production rates, and are often recommended for intermittent cuts.
  • POSITIVE CUTS - Use heavy, constant, feeds to maintain positive cutting action. If feed slows and the tool dwells in the cut, work hardening occurs, tool life deteriorates and close tolerances are impossible.
  • LUBRICATION - lubricants are desirable. Soluble oils are recommended especially when using carbide tooling.

Ulbrich's information on alloy 201

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