Nickel Alloy Plate
Sandmeyer Steel Company stocks dual-certifiable Alloy 200/201 commercially pure nickel plate in the annealed condition in thicknesses from 3/16” (4.8mm) through 1” (25.4mm). Alloy 200/201 combines good mechanical properties with excellent resistance to many corrosive environments. Alloy 201, the lower carbon chemistry, is preferred for service in temperatures above 600°F (315°.C).
Available thicknesses for Alloy 200/201:
Alloys 200 and 201 offer outstanding corrosion resistance to caustic soda and other alkalis. They perform best in reducing environments but can also be used under oxidizing conditions when a passive oxide film is formed. They are used in aerospace, chemical and petrochemical processing, food processing, and marine and water treatment applications. Alloys 200 and 201 are both highly ductile across a wide temperature range and can be easily welded and processed by standard shop fabrication practices.
Alloys 200 (UNS N02200) and 201 (UNS N02201) are dual-certifiable wrought nickel materials. They differ only in the maximum carbon levels present—0.15% for Alloy 200 and 0.02% for Alloy 201.
Alloy 200 is normally limited to service at temperatures below 600ºF (315ºC), since at higher temperatures it can suffer from graphitization which can severely compromise properties. At higher temperatures Alloy 201 should be utilized. Both grades are approved under ASME Boiler and Pressure Vessel Code Section VIII, Division 1. Alloy 200 is approved for service up to 600ºF (315ºC), while Alloy 201 is approved up to 1250ºF (677ºC).
Both grades offer outstanding corrosion resistance to caustic soda and other alkalis. The alloys perform best in reducing environments but can also be used under oxidizing conditions that produce a passive oxide film. They both resist corrosion by distilled, natural water and flowing seawater but are attacked by stagnant seawater.
Alloys 200 and 201 are ferromagnetic and exhibit highly ductile mechanical properties across a wide temperature range.
Both grades are easily welded and processed by standard shop fabrication practices.
- Aerospace and Missile Components
- Chemical and Petrochemical Processing—chlor-alkali production, caustic soda and other alkalis; sulfuric, hydrochloric, hydrofluoric, phosphoric, and organic acids; neutral and reducing salt solutions; reactive chlorides including phosphorus oxychloride, phosphorus trichloride, nitrosyl chloride, benzyl chloride, and benzoyl chloride; fluorine and chlorine; bromine and phenol
- Food Processing Equipment— cooling brine, fatty acids, fruit juices
- Marine and Water Treatment— distilled, natural water and flowing seawater
Weight % (all values are maximum unless a range is otherwise indicated)
|Element||Alloy 200||Alloy 201|
|Nickel (plus Cobalt)||99.0 minimum||99.0 minimum|
Specific Heat0.109 BTU/lb-°F (32—212°F)
456 J/kg-°K (0—100°C)
Modulus of Elasticity 78°F (26°C)29.7 x 103 ksi
205 GPa (20°C)
Thermal Conductivity 212°F (100°C)463 BTU-in/ft2-h-°F
Melting Range2615 – 2635°F
1435 – 1446°C
Electrical Resistivity58 Ohm-circ mil/ft at 70°F
0.096 µΩ/m at 20°C
Mean Linear Expansion
|Temperature Range||Coefficient of Expansion|
|°F||°C||10-6 in/in °F||µm/m °C|
Alloys 200/201, Typical Values at 70°F (21°C), Plate—Hot Rolled, Annealed
in 2 inches
Alloys 200 and 201 possess excellent resistance in many corrosive environments including hydrofluoric acid and alkalis. These alloys perform extremely well under reducing conditions but can also be used in oxidizing conditions due to the formation of a passive oxide film. The outstanding resistance of Alloys 200 and 201 in caustics is based on this type of protection.
In conditions where temperatures exceed 600ºF (315ºC), Alloy 201 is the preferred material, due to its lower carbon content.
The resistance of Alloys 200 and 201 in mineral acid applications varies depending on the concentration and temperature, as well as if the solution is aerated. The alloys perform better in non-aerated acid solutions.
Alloys 200 and 201 perform well in acids, alkalis, and neutral salt solutions. However, in oxidizing salt solutions, strong corrosion can take place.
Both alloys resist dry gases at room temperatures. Alloy 201 can be used in hydrogen chloride and dry chlorine gas up to 1022ºF (550ºC).
|Alloys 200 and 201 General Guideline for Corrosion Resistance|
|Sulfuric Acid||Good||Organic Acids||Excellent|
|Phosphoric Acid||Good||Strong Alkalis||Excellent|
|Hydrochloric Acid||Good||Reducing Salts||Excellent|
|Hydrofluoric Acid||Excellent||Oxidizing Salts||Not recommended|
|Nitric Acid||Not Recommended||Seawater||Good|
Alloys 200 and 201 can be easily welded and processed by standard shop fabrication practices.
Hot bending operations should be performed in the temperature range of 1600º to 2250ºF (870º to 1230ºC). In any operation, care should be taken to avoid heating Alloys 200 and 201 above the upper temperature limit of 2250ºF (1230ºC).
Alloys 200 and 201 can be worked by any conventional cold-forming method. The forming characteristics are comparable to those of mild steel; however, because of the higher elastic limits of Alloys 200 and 201, greater power will be needed to perform the operations. Severe forming can be done manually but will require intermediate anneals to restore the alloy’s softness.
Alloys 200 and 201 should be machined in the annealed condition whenever possible. These grades have the propensity to work harden, making it necessary to utilize low cutting speeds and requiring the cutting tool to stay engaged at all times. An adequate chip depth is important in order to avoid contact with the previously formed work-hardened zone. Liquid cold forming lubricants should be utilized to assure optimal heat dissipation.
Alloys 200 and 201 can be joined by a variety of welding procedures including inert gas and resistance welding. Welding practices are similar to those used to join austenitic stainless steels. Neither preheating nor post-weld heat treatments are usually required.
The following welding procedures are recommended:
|Procedure||Electrode / Filler Metal|
|Shielded Metal-Arc Welding||Nickel Welding Electrode 141|
|Gas Tungsten-Arc||Nickel Filler Metal 61|
|Gas-Metal-Arc Welding||Nickel Filler Metal 61|
Alloys 200 and 201 can also be joined to steel with Nickel Welding Electrode 141 and Nickel Filler Metal 61.
In general, Alloy 201 can be welded by the same procedures as Alloy 200 with one exception. The oxyacetylene process cannot be used for Alloy 201.
NOTE: The information and data in this product data sheet are accurate to the best of our knowledge and belief, but are intended for informational purposes only, and may be revised at any time without notice. Applications suggested for the materials are described only to help readers make their own evaluations and decisions. They are neither guarantees nor warranties of suitability, express or implied, for these or other applications.