Nickel 200 is a solid solution strengthened, commercially pure wrought materials with excellent mechanical properties and resistance to corrosion. It also has exceptional resistance to caustic alkalis at different concentrations and temperatures. However, the corrosion resistance is better in de-aerated acid.
Nickel grade 200 is 99.6% pure nickel, one of the toughest metals. Properties of Nickel 200 include excellent mechanical properties, low gas content, low vapor pressure, magnetic properties, high thermal and electrical conductivity. These properties, along with its chemical composition, make Nickel 200 manufacturable and highly resistant to corrosive environments. Nickel 200 can be used in any environment up to 600º F. It is highly resistant to corrosion by neutral and alkaline salt solutions. Nickel 200 also has a low corrosion rate in neutral and distilled water. Metal can be hot formed into any shape and cold formed by all methods.
Chemical Composition
The chemical composition Nickel 200 alloy is outlined in the following table.
| Element | Content (%) |
|---|---|
| Nickel, Ni | ≥ 99 |
| Iron, Fe | ≤ 0.40 |
| Manganese, Mn | ≤ 0.35 |
| Silicon, Si | ≤ 0.35 |
| Copper, Cu | ≤ 0.25 |
| Carbon, C | ≤ 0.15 |
| Sulfur, S | ≤ 0.010 |
Physical properties：
The following table shows the physical properties of Nickel 200 alloy.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.89 g/cm3 | 0.321 lb/in3 |
| Melting point | 1435-1446°C | 2615-2635°F |
Nickel 200 Available Formats：
- Seamless & welded pipe
- Seamless & welded tube
- Bar
- Sheet
- Plate
- Pipe fittings
- Flanges
Nickel 200 Application:
The following are the list of applications of nickel 200 alloy:
- food processing equipment
- Marine and Marine Engineering
- salt production
- Alkali treatment equipment
- Manufacture and handling of sodium hydroxide, especially at temperatures above 300° F
- Reactors and vessels for generating fluorine and reacting with hydrocarbons
Specification：
- Excellent resistance to a wide range of aggressive media from acidic to alkaline.
- Most useful under reducing conditions, but it can also be used in oxidizing conditions where passivating oxides are formed.
- The most important property is very high resistance to caustic, including in the molten state.
- The presence of chlorates must be kept to a minimum as they speed up the attack.
- The resistance of Alloy 200 to inorganic acids varies with temperature and concentration and whether the solution is aerated.
- Better corrosion resistance in degassing acids.
- In acidic, alkaline and neutral salt solutions, the alloy exhibits good resistance, but undergoes severe corrosion in oxidizing salt solutions.
- Resistant to all dry gases at room temperature.
- Low carbon alloys are available for dry chlorine and hydrogen chloride up to 550 ??‹C (1020 ??‹F).
Thermal Processing：
- Hot working temperatures should be between 1200° F and 2250° F, and reforming at temperatures above 1600° F.
- Annealing should be done at temperatures between 1300°F and 1600°F.
- Care should be taken in selecting the annealing temperature and time as this can greatly affect the mechanical properties and structure of the material.
Solderability：
- Nickel 200 is easily welded by conventional welding, brazing and soldering processes, with the exception of the oxyacetylene process.
Fabrication and Heat Treatment
Nickel 200 alloy can be shaped through all hot working and cold working practices. The alloy can be hot worked between 649°C (1200°F) and 1232°C (2250°F), with heavy forming carried out at temperatures above 871°C (1600°F). Annealing is performed at temperature between 704°C (1300°F) and 871°C (1600°F).