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Brief Introduction of Hastelloy Alloy
Mar 12, 2018

Brief Introduction of Hastelloy Alloy

Mar 21, 2018

Usage:

The Hastelloy plate is suitable for use in a variety of chemical industries containing oxidizing and reducing media. The higher content of molybdenum and chromium makes the alloy resistant to chloride ion corrosion, and tungsten further improves corrosion resistance. 

At the same time, the C-276 Hastelloy tube is one of the only materials that are resistant to moisture, chlorine, hypochlorite and chlorine dioxide solutions. For high concentrations of chlorinated salt solutions such as ferric chloride and cupric chloride Significant corrosion resistance.

Applications, heat exchangers, bellows compensators, chemical equipment, flue gas desulphurization and denitrification, paper industry, aerospace applications, and acidic environments.

 

Classification

At present, it is mainly divided into three series of B, C, and G. It is mainly used in iron-based Cr-Ni or Cr-Ni-Mo stainless steel, non-metallic materials and other unusable strong corrosive media applications.

Hastelloy grade

In order to improve the corrosion resistance and the cold and hot processing performance of Hastelloy, Hastelloy has made three major improvements. The development process is as follows:

B series: B→B-2(00Ni70Mo28)→B-3

C series: C→C-276(00Cr16Mo16W4)→C-4(00Cr16Mo16)→C-22(00Cr22Mo13W3)→C-2000(00Cr20Mo16)

G series: G→G-3(00Cr22Ni48Mo7Cu)→G-30(00Cr30Ni48Mo7Cu)

Currently most widely used are the second generation materials N10665 (B-2), N10276 (C-276), N06022 (C-22), N06455 (C-4), and N06985 (G-3).

Corrosion Resistance Hastelloy C-276 is a nickel-molybdenum-chromium-iron-tungsten nickel base alloy. It is the most resistant to corrosion in modern metallic materials. The main moisture-resistant chlorine, a variety of oxidizing chlorides, chloride salt solution, sulfuric acid and oxidizing salts, have good corrosion resistance in low temperature and medium temperature hydrochloric acid. Therefore, in the past three decades, in harsh corrosive environments, such as chemical industry, petrochemical industry, flue gas desulfurization, pulp and paper, environmental protection and other industrial fields have a wide range of applications.

 

Hastelloy C-276 alloy corrosion data are typical, but can not be used as a specification, especially in the unknown environment, must be tested before they can choose materials. There is not enough Cr in Hastelloy C-276 alloy to resist the corrosion of strong oxidizing environment, such as hot concentrated nitric acid. The production of this alloy is mainly aimed at the chemical process environment, especially in the presence of mixed acid, such as the discharge pipe of the flue gas desulfurization system.


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