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Why is superalloy the most high-end product in the field of special steel?

Views:2     Author:Ronsco     Publish Time: 2021-04-19      Origin:Nickel Alloy Knwoledge

High-temperature alloy materials, also known as heat-strength alloys, heat-resistant alloys, and superalloys, refer to a type of metal materials based on iron, nickel, and cobalt that can work for a long time at a high temperature above 600°C and a certain stress. One of the most high-end products in the steel field.

 

Superalloy has high high temperature strength, good oxidation and corrosion resistance, good fatigue performance, fracture toughness and other comprehensive properties. The biggest feature of superalloys is not that their absolute melting point is very high, but that they still have good characteristics at high temperatures. As one of the most high-end products in the field of special steel, the high-temperature alloy material industry has extremely high barriers and is known as the "Pearl Material in the Industrial Crown".


Superalloys are classified according to matrix elements and can be divided into iron-based superalloys, nickel-based superalloys and cobalt-based superalloys.


  1. Iron-based superalloy: The demand accounts for 14.3%. The matrix is Fe element, and a small amount of alloying elements such as Ni and Cr are added. It can also be called heat-resistant alloy steel.

  2. Nickel-based superalloy: the demand accounts for 80%, and the nickel content is more than half. It is suitable for working conditions above 600°C, and it is also the highest-produced superalloy in my country.

  3. Cobalt-based superalloys: the demand accounts for 5.7%, with cobalt as the matrix, and the cobalt content accounts for about 60%

 

According to the preparation process, superalloys can be divided into deformed superalloys (70%), cast superalloys (20%) and new superalloys (10%); superalloys are divided into solid solution strengthening type and age strengthening according to the strengthening method Type, oxide dispersion strengthened type and grain boundary strengthened type, etc.


The upstream of the high-temperature alloy industry chain is high-temperature master alloys, which can be divided into deformed high-temperature alloys, cast high-temperature alloys and powdered high-temperature alloys according to the material preparation process. After forging, casting, sintering, machining, heat treatment and other manufacturing processes of processing enterprises, they are finally formed High temperature alloy parts.


From the distribution of downstream applications, superalloys are widely used in aerospace, gas turbines, industry, automobiles, petrochemicals and other fields. Among them, the aerospace field is the largest application scenario for superalloys, with a demand share of 55%, followed by gas turbines and petrochemical fields, which account for 33% of energy demand, and industrial and automotive fields, respectively, accounting for 7%. And 3%.


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