Alloy 201，Nickel 201 ，UNS N02201，EFORU

British Specs:BS 3072 BS 3073 BS 3074 BS 3075 BS 3076 NA11，American Specs:ASTM B162 ASTM B163 ASTM B725 ASTM B730 AMS 5553 Sheet and Strip，German Specs:WS 2.4061 WS 2.4068

### **Technical Datasheet: Nickel 201 (Alloy 201 / UNS N02201)** #### **1. Introduction** **Nickel 201** (commercially known as **Alloy 201**, and standardized as **UNS N02201**) is a low-carbon version of commercially pure wrought nickel. With a carbon content of 0.02% maximum, it is specifically designed for high-temperature service where Nickel 200 would be susceptible to embrittlement due to grain-boundary carbide precipitation. This alloy maintains all the beneficial properties of pure nickel – excellent corrosion resistance, high thermal and electrical conductivity, and good mechanical properties – while providing superior performance in temperatures above **315°C (600°F)**. Nickel 201 is the preferred choice for applications involving continuous exposure to elevated temperatures. #### **2. Chemical Composition (% Weight)** The key difference from Nickel 200 is the significantly lower carbon content. | Element | Content (%) (ASTM B160) | Content (%) (Typical) | | :--- | :--- | :--- | | **Nickel (Ni)** | 99.0 min | ≥ 99.6 | | **Carbon (C)** | **0.02 max** | **0.01** | | **Manganese (Mn)** | 0.35 max | 0.20 | | **Iron (Fe)** | 0.40 max | 0.20 | | **Copper (Cu)** | 0.25 max | 0.15 | | **Silicon (Si)** | 0.35 max | 0.15 | | **Sulfur (S)** | 0.01 max | 0.005 | #### **3. Physical Properties** | Property | Metric Unit | Imperial Unit | | :--- | :--- | :--- | | **Density** | 8.89 g/cm³ | 0.321 lb/in³ | | **Melting Point** | 1435-1445 °C | 2615-2633 °F | | **Thermal Conductivity** (at 25°C) | 70 W/m·K | 485 BTU·in/hr·ft²·°F | | **Electrical Resistivity** | 0.095 µΩ·m | 36.5 µΩ·in | | **Modulus of Elasticity** | 186 GPa | 27 x 10⁶ psi | | **Thermal Expansion Coefficient** (20-100°C) | 13.3 µm/m·°C | 7.4 x 10⁻⁶ in/in·°F | | **Curie Temperature** | ~ 360 °C | ~ 680 °F | #### **4. Mechanical Properties (Typical at Room Temperature)** Properties vary with product form and temper. **Annealed Condition:** * **Tensile Strength:** 380 - 480 MPa (55 - 70 ksi) * **Yield Strength (0.2% Offset):** 105 - 195 MPa (15 - 28 ksi) * **Elongation (in 2 inches):** 45 - 55% **Elevated Temperature Properties (at 500°C/932°F):** * **Tensile Strength:** ~ 250 MPa (36 ksi) * **Yield Strength:** ~ 100 MPa (15 ksi) #### **5. International Standards** Nickel 201 is covered by equivalent specifications to Nickel 200, with appropriate grade designation. | Product Form | ASTM Standard | ASME Standard | UNS | | :--- | :--- | :--- | :--- | | **Plate, Sheet & Strip** | ASTM B162 | SB-162 | N02201 | | **Rod & Bar** | ASTM B160 | SB-160 | N02201 | | **Pipe & Tube** | ASTM B161, B163 | SB-161, SB-163 | N02201 | | **Forgings** | ASTM B564 | SB-564 | N02201 | | **Wire** | ASTM B160 | - | N02201 | #### **6. Key Characteristics & Advantages** * **Excellent High-Temperature Stability:** Resists embrittlement at temperatures above 315°C (600°F) due to low carbon content * **Superior Corrosion Resistance:** Excellent resistance to caustic alkalis, neutral and reducing salts, and various organic compounds * **High Thermal Conductivity:** Efficient heat transfer capability * **Excellent Electrical Conductivity:** Superior to most corrosion-resistant alloys * **Good Low-Temperature Properties:** Maintains ductility and toughness at cryogenic temperatures * **Magnetic Properties:** Ferromagnetic at room temperature, becoming non-magnetic above Curie temperature (~360°C/680°F) #### **7. Temperature Capability** * **Recommended Maximum Service Temperature:** **600°C (1112°F)** * **Continuous Service:** Up to 600°C (1112°F) without embrittlement concerns * **Intermittent Service:** Up to 815°C (1500°F) for short durations * **Cryogenic Service:** Down to -196°C (-321°F) #### **8. Product Applications** Nickel 201 is specified for high-temperature applications across multiple industries: * **Chemical Processing:** * High-temperature caustic evaporators and concentrators * Reactor components operating above 315°C (600°F) * Distillation columns and heat exchangers in elevated temperature service * Catalyst support structures * **Aerospace & Defense:** * Rocket engine components * High-temperature instrumentation * Turbine engine components * High-temperature fasteners * **Electronic Components:** * Lead frames for high-temperature applications * Electronic tube components * High-temperature electrical connectors * **Food Processing:** * High-temperature food processing equipment * Fatty acid distillation equipment * Hydrogenation process equipment * **Other High-Temperature Applications:** * Furnace components and radiant tubes * Heat treating fixtures and baskets * Glass-to-metal seals * Nuclear energy components --- **Disclaimer:** The information provided herein is for reference purposes only. Material properties can vary based on manufacturing process, heat treatment, and product form. For critical applications, consult the relevant material standards and a qualified materials engineer. Performance at elevated temperatures should be verified for specific service conditions.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1637 gallon liquid totes Special package is available on request.