Table of Contents
In this blog post, we’ll cover everything about Nickel Alloy 200, from its composition and mechanical and physical properties to its uses and welding properties. We’ll also cover heat treatment and machining of nickel alloy 200.
What is Nickel Alloy 200?
Nickel alloy 200 is a highly sought-after metal known for its high corrosion resistance and excellent mechanical and physical properties. This pure nickel alloy is extensively used for various applications, including chemical processing, electronics, and aerospace.
Nickel Alloy 200 Composition
Nickel alloy 200 is a commercially pure nickel with excellent resistance to many corrosives, such as acids, alkaline solutions, and neutral salts. It also has high melting and boiling points, which makes it an ideal material for high-temperature applications. Nickel alloy 200 does not contain hardenable elements such as chromium, molybdenum, or copper, making it an excellent choice for applications without hardness. The chemical composition of nickel alloy 200 is Ni 99.6%, Fe 0.4%, and other impurities.
| 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 |
Nickel Alloy 200 Mechanical Properties
Nickel alloy 200 has impressive mechanical properties, making it an ideal material for various industrial applications. Its tensile strength is about 55,000 psi, with a yield strength of 22,000 psi. The elongation of nickel alloy 200 is around 40%, and its hardness is usually in the annealed condition, between 70 to 120 HRB. Also, nickel alloy 200 has a high modulus of elasticity of 29 million psi, making it ideal for applications requiring high stiffness.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength (annealed) | 462 MPa | 67000 psi |
| Yield strength (annealed) | 148 MPa | 21500 psi |
| Elongation at break (annealed prior to test) | 45% | 45% |
Nickel Alloy 200 Physical Properties
The physical properties of nickel alloy 200 include high thermal conductivity, low electrical resistivity, and high thermal expansion. Its thermal conductivity is about 39 BTU in/hr ft2 °F, while its electrical resistivity is about 49.1 micro-ohm-cm. The thermal expansion coefficient of nickel alloy 200 is around 7.5 x 10^-6 per °C, which makes it an ideal material for use in high-temperature applications that require consistent performance even under extreme temperature changes.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.89 g/cm3 | 0.321 lb/in3 |
| Melting point | 1435-1446°C | 2615-2635°F |
Nickel Alloy 200 Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@20-100°C/68-212°F) | 13.3 µm/m°C | 7.39 µin/in°F |
| Thermal conductivity | 70.2 W/mK | 487 BTU.in/hrft².°F |
Nickel Alloy 200 Equivalents
- ASME SB-160 – SB-163
- DIN 17740
- DIN 17750-17754
- BS 3072-3076
- ASTM B 160 – B 163
- ASTM B 725
- ASTM B 730
Nickel Alloy 200 Uses
Due to its excellent properties, nickel alloy 200 is used in various industrial applications. It is commonly used to manufacture chemical processing equipment, electronic components, aerospace components, and heat exchangers. Its high resistance to many corrosive environments makes it an ideal material for marine applications, where saline water and moist environments would otherwise damage other metals.
Nickel Alloy 200 Corrosion Resistance
Nickel alloy 200 is highly resistant to many corrosive agents, including dilute sulfuric acid, saltwater, and alkalis. It can withstand extreme environmental conditions, making it ideal for chemical processing equipment, electronics, and marine applications. Nickel alloy 200 is also resistant to stress corrosion cracking and offers good resistance to pitting and crevice corrosion.
Nickel Alloy 200 Heat Treatment
Nickel alloy 200 can be heat treated to increase hardness and strength. The most common heat treatment process for nickel alloy 200 is annealing, which softens the metal and reduces its hardness. This makes it easier to machine and form. However, nickel alloy 200 cannot be hardened by heat treatment.
Nickel Alloy 200 Machining
Nickel alloy 200 requires special machining techniques due to its high ductility and low work hardening rate. The recommended machining techniques for nickel alloy 200 include slow speed and heavy cuts, high feeds, and sharp cutting tools. The most commonly used cutting tools for nickel alloy 200 are carbide and high-speed steel—additionally, nickel alloy 200 machines are well under lubrication to reduce friction and heat accumulation.
Nickel Alloy 200 Welding
Nickel alloy 200 exhibits good welding properties and can be welded using various methods, including arc welding, TIG welding, and MIG welding. When welding nickel alloy 200, precautions are essential to prevent cracking, distortion, and porosity. The recommended welding techniques for nickel alloy 200 include preheating the metal, reducing the heat input, and controlling the welding speed.
Conclusion:
Nickel alloy 200 is a highly versatile metal extensively used in various industrial applications due to its high corrosion resistance and excellent mechanical and physical properties. Its properties make it ideal for chemical processing, electronics, aerospace, and marine applications. However, special machining techniques are required when working with nickel alloy 200 due to high ductility and low work hardening rate. Additionally, proper precautions must be taken when welding nickel alloy 200 to prevent cracking, warping, and porosity. When used correctly, nickel alloy 200 can perform exceptionally even in extreme environmental conditions.
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