Nickel 200/Ni 200/UNS N02200/W.Nr. 2.4066/Alloy 200 bar

Nickel 200 bar, designated as UNS N02200 and material number W.Nr. 2.4066, is a commercially pure wrought nickel alloy (≥99.0% Ni) known for its excellent combination of mechanical properties, high thermal and electrical conductivity, and outstanding corrosion resistance, particularly to caustic alkalis, neutral and reducing environments. This bar stock form is a versatile engineering material used for machining components in chemical processing, food production, electronics, and aerospace applications where purity, ductility, and reliable performance in aggressive media are essential.

Introduction to Nickel 200 (Alloy 200)

Nickel 200 is essentially pure nickel with controlled trace elements. It offers good strength and toughness, exceptional ductility, and ease of fabrication through welding, forging, and machining. Its high nickel content provides inherent resistance to corrosion by caustic solutions, salts, and many organic compounds. A key limitation is its susceptibility to graphite precipitation and embrittlement when exposed to temperatures between approximately 315°C and 600°C (600°F and 1110°F) for prolonged periods; for such service, the low-carbon grade Nickel 201 (UNS N02201) is specified. The bar stock is a fundamental material for handling caustic soda, producing synthetic fibers, and in electronic components.

Chemical Composition of Nickel 200 Bar

The properties of Nickel 200 bar stem from its high purity and specific impurity limits. Supplied by Shanghai NC Metal Materials Co., Ltd., the bar stock conforms to international standards ensuring consistent quality.

Mechanical Properties of Nickel 200 Bar

Nickel 200 bar exhibits moderate strength with exceptionally high ductility and toughness, even at cryogenic temperatures. Properties can be significantly enhanced by cold working.

Physical Properties of Nickel 200 Bar

The physical properties of pure nickel are distinctive and contribute to its wide range of applications.

Standard Specifications, Bar Forms, and Available Sizes

Shanghai NC Metal Materials Co., Ltd. supplies Nickel 200 bar in a comprehensive range of forms and tempers to suit various manufacturing processes.

Primary Applications of Nickel 200 Bar Stock

Machined components from Nickel 200 bar are used across multiple industries: Chemical Processing: Pump shafts, valve stems, agitators, fasteners, and heat exchanger tubes for handling caustic alkalis (sodium/potassium hydroxide), fluorine, and various organic chemicals. Food & Pharmaceutical Equipment: Parts requiring high purity, cleanability, and resistance to corrosion. Electronics & Electrical Engineering: Lead frames, connectors, spark plug electrodes, and components for magnetic shielding. Aerospace: Waveguide components, cryogenic tubing, and seals. Caustic Evaporation & Handling: Critical components in the production and transfer of concentrated caustic soda.

Corrosion Resistance Overview

Nickel 200 exhibits excellent corrosion resistance in a wide array of environments. It is particularly renowned for its resistance to caustic alkalis in all concentrations up to the boiling point. It performs well in neutral and alkaline salt solutions, dry halogens like chlorine and fluorine at room temperature, and many organic acids and compounds. It also resists hydrochloric, sulfuric, and phosphoric acids under reducing conditions. Its main weaknesses are in oxidizing environments, such as nitric acid, and in aerated ammonium hydroxide solutions. For high-temperature caustic service, Nickel 201 is required.

Machining and Fabrication

Nickel 200 bar has fair machinability. Its high ductility makes it gummy, leading to long, tough chips and built-up edge on tools. Successful machining requires: sharp cutting tools (high-speed steel or carbide) with positive rake angles; moderate cutting speeds; heavy, positive feed rates to promote chip breaking; and generous use of cutting fluids or coolants, preferably sulfurized or chlorinated oils for best results. The alloy is exceptionally formable and can be readily cold-worked, forged, and welded.

Welding and Heat Treatment

Nickel 200 is highly weldable using all standard fusion welding processes, including Gas Tungsten Arc Welding (GTAW/TIG), Gas Metal Arc Welding (GMAW/MIG), and Shielded Metal Arc Welding (SMAW). Matching filler metals (e.g., ERNi-1) are recommended. Preheating is generally not required. Post-weld heat treatment is not necessary for corrosion resistance in most applications. The standard annealing treatment to achieve maximum softness involves heating to 705-925°C (1300-1700°F) followed by rapid cooling (water quench).

Reference Pricing and Key Purchasing Factors

The price of Nickel 200 bar from Shanghai NC Metal Materials Co., Ltd. is predominantly driven by the LME (London Metal Exchange) price for primary nickel, with additional costs for processing, form, and temper.