Nickel 201 - UNS N02201

UNS N02201

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 201 alloy 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, 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.
  • 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.
  • 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. Manufacture of soap.
  • Analine hydrochloride production and in the chlorination of aliphatic hydrocarbons such as benzene, methane and ethane.
  • Manufacture of vinyl chloride monomer.
  • Reactors and vessels in which fluorine is generated and reacted with hydrocarbons


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

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

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

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

Form Standard
Metal Type UNS N02201
Bar ASTM B160 Din 17752 BS 3076
Sheet ASTM B162 Din 17750 BS 3072
Plate ASTM B162 Din 17750 BS 3072
Pipe ASTM B622 ASTM B161 Din 17740 BS 3074
Tube ASTM B622 ASTM B161 ASTM B163 Din 17740 BS 3074
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. Detailed machining parameters are presented Tables 16 and 17. General plasma cutting recommendations are presented in Table 18.