Alloy 200/201 (commercially known as Nickel 200/201, corresponding to UNS N02200 / N02201, W.Nr. 2.4066 / 2.4068) is a commercially pure wrought nickel alloy with a nickel content of over 99.6%. It is renowned for its excellent corrosion resistance, good mechanical properties, outstanding thermal and electrical conductivity, and unique magnetostrictive characteristics. Through carbon content control, NeoNickel supplies dual-certified material that meets the requirements of both Alloy 200 and Alloy 201. The extremely low carbon content of Alloy 201 makes it virtually immune to intergranular corrosion at temperatures above 315°C, positioning it as the ideal choice for high-temperature caustic service applications.
Click to get an Nickel 201 product quote
Alloy 200/201 (Nickel 200/201): 99.6% High-Purity Nickel
Alloy 200/201 (Nickel 200/201): 99.6% High-Purity Nickel
Nickel 200/201 (UNS N02200/N02201) is a commercially available forged nickel alloy with a purity of 99.6%. It is known for its excellent corrosion resistance (especially against strong alkalis), high thermal and electrical conductivity, and excellent ductility.
What is Alloy 200 material?
Alloy 200 and Alloy 201 (commonly referred to as Nickel 200 and Nickel 201) are commercially pure nickel alloys with a nickel content exceeding 99%. Both Alloy 200 and Alloy 201 exhibit high corrosion resistance, especially in reducing environments. They also possess high electrical conductivity.
1. Chemical composition of Alloy 200 material
The chemical composition (weight percentage) of Alloy 200/201 is shown in the table below. Their extremely high purity is the foundation of their performance.
| Element | Alloy 200 (UNS N02200) | Alloy 201 (UNS N02201) | Primary Function |
|---|---|---|---|
| Nickel (Ni) + Cobalt (Co) | ≥ 99.0 | ≥ 99.0 | Matrix; provides corrosion resistance, thermal and electrical conductivity, and magnetostriction. |
| Iron (Fe) | ≤ 0.40 | ≤ 0.40 | Impurity element; strictly controlled. |
| Manganese (Mn) | ≤ 0.35 | ≤ 0.35 | Impurity element; improves hot workability. |
| Carbon (C) | ≤ 0.15 | ≤ 0.02 | Key differentiator. High carbon may lead to graphitization at high temperatures; low carbon in Alloy 201 provides better resistance to intergranular corrosion above 315°C. |
| Silicon (Si) | ≤ 0.35 | ≤ 0.35 | Impurity element. |
| Copper (Cu) | ≤ 0.25 | ≤ 0.25 | Impurity element. |
| Sulfur (S) | ≤ 0.01 | ≤ 0.01 | Harmful impurity; strictly controlled. |
| Magnesium (Mg) | ≤ 0.15 | ≤ 0.15 | Sometimes added to improve hot workability. |
| Titanium (Ti) | ≤ 0.10 | ≤ 0.10 | Sometimes added to improve hot workability. |
2. Alloy 200 Material Physical Properties
| Property | Typical Value / Range | Unit |
|---|---|---|
| Density | 8.89 – 8.90 | g/cm³ |
| Melting Range | 1435 – 1446 (typically 1300 – 1350) | °C |
| Curie Temperature | approx. 360 | °C |
| Coefficient of Thermal Expansion (20-100°C) | 13.1 – 13.3 | ×10⁻⁶/°C |
| Thermal Conductivity (20°C) | 66.5 – 79.3 | W/(m·K) |
| Specific Heat Capacity (0-100°C) | 456 – 500 | J/(kg·K) |
| Electrical Resistivity (20°C) | 0.096 – 0.108 | μΩ·m |
| Modulus of Elasticity (room temperature) | approx. 200 – 207 | GPa |
3. Room temperature mechanical properties of Alloy 200 (annealed, typical values)
| Property | Alloy 200 (Typical) | Alloy 201 (Typical) | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | 380 – 550 (commonly 462) | 340 – 500 (commonly ≥ 403) | MPa |
| 0.2% Yield Strength (Rp0.2) | 105 – 210 (commonly 148) | 83 – 240 (commonly ≥ 103) | MPa |
| Elongation (A) | 30 – 50% (commonly 40-47%) | 30 – 50% (commonly ≥ 40-50%) | % |
| Hardness | 45 – 80 HRB / 45 – 70 HB | 45 – 80 HRB / 45 – 70 HB | - |
Note: Mechanical properties are significantly influenced by product form (bar, plate, tube) and heat treatment condition (annealed, hot worked, cold worked). Cold worked condition significantly increases strength but decreases ductility.
Click to download the Nickel 201 alloy PDF file now
5. Welding and Heat Treatment
Heat Treatment (Annealing):
Purpose: To relieve cold working stress and restore plasticity.
Temperature: 700 – 900°C.
Cooling: Air cooling or water quenching.
Welding:
Weldability: Excellent. All conventional welding methods can be used, such as TIG, MIG, SMAW, and SAW.
Consumable Selection: Matching pure nickel consumables are recommended, such as ERNi-1 (AWS A5.14) wire or ENi-1 (AWS A5.11) electrode.
Process Control: No preheating required. Low heat input should be maintained, interpass temperature controlled, and a high-purity shielding gas (such as argon) should be used to prevent contamination.
6. Alloy 200/201 Application Areas
Leveraging their unique combination of properties, Alloy 200/201 are widely used across multiple critical industrial sectors:
| Industry | Applications |
|---|---|
| Chemical & Petrochemical | Caustic soda (sodium hydroxide) production equipment (evaporators, reactors), organic chlorination processes, fluorination reaction vessels, phenol storage and transport equipment. |
| Food & Pharmaceutical | Food processing equipment (handling chilled brine, fatty acids, fruit juices), piping and vessels ensuring product purity. |
| Electronics & Electrical | Electronic tube components, spark plug electrodes, magnetostrictive transducers (utilizing high electrical conductivity and magnetic properties). |
| Aerospace & Cryogenics | Rocket engine components, cryogenic storage tanks and piping. |
| Energy & Manufacturing | Molten salt electrolysis cells, heat treatment fixtures, combustion boats. |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
Gnee Alloy Alloy 200 Certificate
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Alloy Nickel 200 Alloy Product Packing
Contact us for the latest export price quote for Alloy 200
FAQ
Q：What is the main difference between Alloy 200 and Alloy 201?
A：The main difference lies in the carbon content. Alloy 201 has a significantly lower carbon content (≤0.02%) than Alloy 200 (≤0.15%). This allows Alloy 201 to effectively avoid intergranular corrosion and embrittlement caused by carbide or graphite precipitation in high-temperature environments above 315°C (600°F), making it the preferred choice for high-temperature alkaline applications.
Q：What is its maximum operating temperature?
A：Alloy 200 is recommended for use below 315°C. Due to its low carbon content, Alloy 201 can be used at higher temperatures, with short-term operating temperatures up to approximately 600°C in oxidizing atmospheres and up to 550°C in dry chlorine.
Q：Does it resist chloride stress corrosion cracking?
A：Yes, excellently. Its high nickel content gives it extremely strong immunity to chloride stress corrosion cracking, far superior to stainless steel.
Q：How are its electrical and thermal conductivity?
A：Excellent. As a high-purity nickel, its thermal and electrical conductivity are significantly better than most nickel-based alloys, making it suitable for components requiring good thermal or electrical conduction.
Q：What international standards apply to it?
A：Common standards include: UNS N02200/N02201, W.Nr. 2.4066/2.4068, ASTM B160/B161/B162, ASME SB160/SB161/SB162, DIN 17750/17751/17752, etc.
