Excellent Corrosion Resistance of Nickel 201
Nickel 201 offers outstanding resistance to caustic alkalis, anhydrous ammonia, and reducing chemical environments. It performs particularly well in high-temperature, high-purity, and high-alkaline applications.
What is Nickel 201?
Nickel 201 is the low-carbon version of Nickel 200 (carbon ≤ 0.02%), designed to prevent graphitization at elevated temperatures (above 315°C), making it suitable for high-temperature environments.
Nickel 201 Equivalent Grades
| Standard / System | Equivalent Grade |
| UNS | N02201 |
| W.Nr. | 2.4068 |
| JIS | NW2201 |
| BS | NA12 |
| ASTM | B160 / B162 / B366 / B564 |
| ISO | Ni 99.2 LC |
Nickel 201 Chemical Composition
| Element | Content (%) |
| Nickel (Ni) | ≥ 99.0 |
| Copper (Cu) | ≤ 0.25 |
| Iron (Fe) | ≤ 0.40 |
| Manganese (Mn) | ≤ 0.35 |
| Carbon (C) | ≤ 0.02 |
| Silicon (Si) | ≤ 0.35 |
| Sulfur (S) | ≤ 0.01 |
Nickel 201 Mechanical Properties (Annealed, Room Temperature)
| Property | Typical Value |
| Tensile Strength | 380 MPa |
| Yield Strength (0.2%) | 105 MPa |
| Elongation | ≥ 45% |
| Hardness (HRB) | ≤ 60 |
Nickel 201 Physical Properties
| Property | Value |
| Density | 8.89 g/cm³ |
| Melting Point | 1435–1446°C |
| Electrical Conductivity | ~22% IACS |
| Thermal Conductivity | ~60 W/m·K (at RT) |
| Specific Heat | 0.444 J/g·K |
| Magnetic Properties | Slightly magnetic |
Applications of Nickel 201
- Caustic soda and alkali handling equipment
- High-temperature processing in food and chemical industries
- High-purity gas systems
- Reactors, heat exchangers, and evaporators
- Electrical and electronic components
Advantages of Nickel 201
- Excellent corrosion resistance in alkaline environments
- Low carbon prevents embrittlement at high temperatures
- High ductility and good weldability
- Good electrical and thermal conductivity
- Suitable for high-purity and reducing environments
Limitations of Nickel 201
- Poor resistance to oxidizing agents like nitric acid
- Higher cost compared to stainless steel
- Lower mechanical strength compared to alloyed materials
- Limited use in structural applications requiring high strength
How is Nickel 200 Manufactured?
- Raw Material Melting
High-purity nickel (≥99.0%) with controlled low carbon content (≤0.02%) and minor alloying elements are melted in electric or vacuum induction furnaces to ensure chemical purity. - Casting
The molten Nickel 201 is poured into molds to form ingots or continuously cast into billets for further processing. - Hot Working
Ingots or billets are hot-rolled, forged, or extruded at temperatures between 1000–1200°C into intermediate products such as sheets, plates, bars, or tubes. - Annealing
The material is annealed at approximately 700–900°C to relieve internal stresses, refine grain structure, and enhance ductility and corrosion resistance. - Cold Working
Final dimensions and surface finish are achieved through cold rolling, drawing, or machining, which also increases mechanical strength and dimensional accuracy. - Quality Control & Inspection
Nickel 201 products undergo stringent testing for mechanical properties, chemical composition, grain size, and corrosion resistance to meet ASTM, ASME, and other applicable specifications.
Nickel 200 vs Nickel 201
| Property | Nickel 200 | Nickel 201 |
| Carbon Content | ≤ 0.15% | ≤ 0.02% |
| High Temperature Use | Limited (risk of graphitization) | Better suited (low carbon resists graphitization) |
| Electrical Conductivity | Slightly higher | Slightly lower |
| Mechanical Strength | Slightly stronger | Slightly softer |
| Preferred For | General use, caustic resistance | Applications ≥ 315°C (600°F) |
Choose Nickel 201 for higher-temperature environments, and Nickel 200 for stronger mechanical needs below 315°C.
FAQ About Nickel 201
Yes. Nickel 201 has excellent weldability and is compatible with common processes such as TIG, MIG, and arc welding. Heat input should be controlled to avoid grain growth.
The recommended continuous operating limit is approximately 600°C, with intermittent service possible up to 700°C, depending on the environment.
Yes, due to its high purity and excellent corrosion resistance, Nickel 201 is used in food-grade and some pharmaceutical processing equipment, provided regulatory standards are met.
For lower-temperature applications, Nickel 200 can be used. In more aggressive corrosive environments, alloys like Hastelloy, Inconel, or Monel may be preferred.
Summary
This article introduces Nickel 201, explains the alloy, and discusses its composition, properties, and applications. For more information about Nickel 201, please get in touch with an MT.BOLTS representative.
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