Both Nickel 201 and Nickel 200 are commercially pure wrought materials that are solid solution strengthened, and enjoy commendable mechanical properties over an expansive range of temperatures while having good resistance to several corrosives, which includes hydroxides in particular. Nickel 201 basically is a modification of Nickel 200 to control carbon that prevents it from getting embrittled by intergranular precipitates in many processes where the temperature ranges from 600° F to 1400° F. In many cases, the elemental restrictions of nickel 200 and nickel 201 tend to be combined into single dual-certified chemistry that results in an alloy that features desired features of both Nickel 200/201.
Common forms in which Nickel 201 is available
- Pipe and Tube (both welded and seamless)
Fittings are another common form in which Nickel 201 can be found in. These fitting may include pipe nipples, flanges, long welding necks, slip-on, socket welds, and so on.
The chemical composition nickel 201 alloy is outlined in the following table.
|Nickel, Ni||≥ 99|
|Iron, Fe||≤ 0.4|
|Manganese, Mn||≤ 0.35|
|Silicon, Si||≤ 0.35|
|Copper, Cu||≤ 0.25|
|Carbon, C||≤ 0.020|
|Sulfur, S||≤ 0.010|
The following table shows the physical properties of nickel 201 alloy.
|Density||8.89 g/cm3||0.321 lb/in3|
|Melting point||1435 – 1446°C||2615 – 2635°F|
Key characteristics of Nickel 201
- Highly resistant to diverse types of reducing chemicals
- Commendable resistance to caustic alkalis
- High electrical conductivity
- Remarkable corrosion resistance to both distilled and natural waters
- Good resistance to neutral and alkaline salt solutions
- High resistance to dry fluorine
- Extensively used in order to handle caustic soda
- Great magnetostrictive, electrical and thermal properties
- Provides an adequate level of resistance to sulfuric and hydrochloric at modest concentrations and temperatures
Nickel 201 is known to provide corrosion resistance in neutral and reducing media, and even oxidizing atmospheres in case the formation of a passive oxide film is not allowed by oxidizing media. This oxide film is known to account for various materials that have a high level of resistance in caustic environments. The corrosion rates of Nickel 201 in both rural and marine atmospheres are quite low. It additionally enjoys an incredible resistance to corrosion by natural and distilled waters. Even at high velocity, it tends to boasts of offering a remarkable service in flowing seawater. However, in very low-velocity seawater or stagnant water, a severe local attack might take place under fouling organisms or other types of deposits. The corrosion rates of this material would initially be high but would reduce with time in hot systems where the steam features air and carbon dioxide in particular portions, in case the conditions favor the development of a protective film.
Nickel 201 Mechanical Properties
Room Temperature properties of Various Products
|Product Form||Condition||Tensile (ksi)||.2% Yield (ksi)||Elongation (%)||Hardness (HRB)|
|Alloy 201 Rod & Bar||Hot Finished||60-85||15-45||55-35||45-80|
|Alloy 201 Bar & Rod||Cold Drawn/Annealed or Hot-Finished/Annealed||55-75||15-30||55-40||45-70|
|Alloy 201 Plate||Hot-Rolled/Annealed||55-80||15-40||60-40||45-75|
|Alloy 201 Sheet||Annealed||55-75||15-30||55-40||70 max|
|Alloy 201 Tube & Pipe||Seamless Annealed||55-75||12-30||60-40||70 max|
The thermal properties of nickel 201 alloy are given in the following table
|Thermal expansion co-efficient (@20-100°C/68-212°F)||13.1 µm/m°C||7.28 µin/in°F|
|Thermal conductivity||79.3 W/mK||550 BTU.in/hrft².°F|
Fabrication with Nickel 201
When shaping this nickel alloy, people can make use of almost any type of hot working and cold working practices. The temperatures range between 1200° F and 2250° F must be used for hot working. When it comes to performing heavy forming; the temperatures must be above 1600° F. 1300° F and 1600° F would be the ideal temperature range for performing annealing. It is important to take care when selecting the anneal temperature and time as it can influence the structure and mechanical properties of the material to a good extent.
Nickel 201 is used in multiple industries. The common applications of this nickel alloy include food processing equipment, marine, and offshore engineering, salt production and caustic handling equipment.
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