After the formation of austenite crystal nuclei, it will continue to grow to ferrite and Fe3C, but the growth rate is different, and the growth rate is usually lower to Fe3C. Therefore, after the ferrite disappears, a part of Fe3C remains, and there is also a carbon inhomogeneity in the austenite. As the holding time is extended, the residual Fe2C will continue to be incorporated into the austenite. At the end of Fe3C dissolution, there is still an inhomogeneity of C in the austenite, which needs to be eliminated by continuing through the diffusion process, which is called homogenization of austenite.
nickel 201
Material Grade:Nickel 201 pure nickel alloy
Chinese grade: N4
U.S. Grade:uns n02201
German Grade:
1. Overview of nickel 201 (N4, N02201) pure nickel alloys
Nickel 201 (N02201) pure nickel alloy is a pure nickel alloy composed of trace elements such as manganese, copper and nickel, which has good mechanical properties and excellent resistance in many corrosive environments. Other useful properties of the alloy include its magnetic properties, magnetostrictive properties, high thermal and electrical conductivity, low gas content and low evaporation pressure. The corrosion resistance of nickel 201 makes it particularly useful in applications such as food, man-made fibers and caustic soda where product purity is required. It is also widely used in structural applications where corrosion resistance is a major consideration. Other uses include chemical drums, electrical and electronic components, aerospace and missile components.
2. Overview of nickel 201 (N4, N02201) pure nickel alloys: see Table 1:
Table-1
3. The main passage of nickel 201 (N4, N02201) pure nickel alloy:
Nickel 201 (N02201) pure nickel alloy is a solid solution alloy with a face-centered cubic structure, which usually exhibits a small amount of non-metallic inclusions in the microstructure, which are mainly oxides and do not change with annealing. Typically used above °F (315°C), nickel 201 is more commonly used. Nickel-200 and Nickel-201 are ASME Boiler and Pressure Vessel Approved Construction Materials**. Nickel 200 is approved for use up to 600°F (315°C) and Nickel 201 is approved for service up to 1250°F (677°C).
4. Main characteristics and applications of nickel 201 (N4, N02201) pure nickel alloy:
1. Nickel201 is pure commercial nickel with very low carbon content and has been approved for use in high-temperature environments up to 1230.
2. Nickel 201 application field:
1) Food processing equipment, salt refining equipment.
2) Mining and marine mining.
3) The equipment required to manufacture industrial sodium hydroxide under the high temperature condition of more than 300 meters.
4) Production of organic or inorganic chlorides and fluorides: resistant to chlorine and fluoride corrosion.
5), nuclear reactors.
6) Curved neck flasks and parts in heat treatment furnaces, especially in carbonization and nitriding atmospheres.
7) The catalytic regenerator in petrochemical production is recommended to use alloy 600 for long service life in applications above 700.
5. Varieties and specifications of nickel 201 (N4, N02201) pure nickel alloy and ** state:
1. Variety classification: special alloys can produce various specifications of nickel201 seamless pipes, nickel201 steel plates, nickel201 round bars, nickel201 forgings, nickel201 flanges, nickel201 rings, nickel201 welded pipes, nickel201 steel strips, nickel201 wires and supporting welding consumables.
2. Delivery status: seamless tube: solid solution + acid white, the length can be fixed;Plates: solution, pickling, trimming;Welded pipe: solid solution acid white + RT% flaw detection, forgings: annealing + turning light;The bar is in a forged, surface-polished or turned state;The strip is delivered cold-rolled, solution-soft and descaledThe filaments are delivered in solution pickled discs or straight strips, solution straight strips in finely polished condition.