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Hastelloy Alloy in 2020 Complete Alloy Overview

Views:4     Author:Ronsco     Publish Time: 2020-06-09      Origin:Nickel Alloy Knwoledge

     Hastelloy is a nickel-based corrosion-resistant alloy, Mainly divided into nickel-chromium alloy and nickel-chromium-molybdenum alloy. Hastelloy has good corrosion resistance and thermal stability, and is mostly used in the aviation industry and chemical fields.

    Hastelloy grades include the following grades:

    HASTELLOY B-2 nickel-molybdenum alloy has excellent corrosion resistance in a reducing environment. The upgraded version of HASTELLOY B-3 B-2 has excellent corrosion resistance to hydrochloric acid at any temperature and concentration.

   HASTELLOY C-4 has better thermal stability, 650-1040 degrees Celsius has better toughness and corrosion resistance.

  HASTELLOY C-22 has better uniform corrosion resistance in oxidizing media than C-4 and C-276, and excellent local corrosion resistance. HASTELLOY C-276 has good resistance to oxidizing and moderately reducing corrosion, and excellent stress resistance Corrosion ability. HASTELLOY C-2000 is the most comprehensive corrosion-resistant alloy with excellent resistance to uniform corrosion in both oxidizing and reducing environments.

  HASTELLOY G-35 G-30 is an upgraded product with better corrosion resistance and thermal stability. HASTELLOY G-30 is a nickel-based alloy with high chromium content. It is excellent in phosphoric acid and other strong oxidizing mixed acid media.

HASTELLOY X has comprehensive high strength, anti-oxidation and easy processing characteristics. Each of the above grades has specific chemical composition, mechanical properties, and has its own strengths. It is not possible to generalize about the characteristics of Hastelloy.

Excellent corrosion ability HASTELLOY C-276 has good resistance to oxidizing and moderately reducing corrosion, and excellent resistance to stress corrosion. HASTELLOY C-2000 is the most comprehensive corrosion-resistant alloy with excellent resistance to uniform corrosion in both oxidizing and reducing environments.
HASTELLOY G-35 G-30 is an upgraded product with better corrosion resistance and thermal stability. HASTELLOY G-30 is a nickel-based alloy with high chromium content. It is excellent in phosphoric acid and other strong oxidizing mixed acid media.
hastelloy-c276-bars-rods From China Factory

HASTELLOY X has comprehensive high strength, anti-oxidation and easy processing characteristics. Each of the above grades has specific chemical composition, mechanical properties, and has its own strengths. It is not possible to generalize about the characteristics of Hastelloy.


Application:
Hastelloy sheet is suitable for all kinds of chemical industries containing oxidizing and reducing media. The higher molybdenum and chromium content makes the alloy resistant to chloride ion corrosion, and the tungsten element further improves the corrosion resistance. At the same time, C-276 Hastelloy tube is one of the only materials that are resistant to the corrosion of damp chlorine gas, hypochlorite and chlorine dioxide solutions. It has a high concentration of chloride salt solutions such as ferric chloride and copper chloride. Significant corrosion resistance.
Application areas, heat exchangers, bellows compensators, chemical equipment, flue gas desulfurization and denitrification, paper industry, aerospace applications, acidic environments.


Characteristic:
In the state of two atmospheres of oxidation and reduction, it has excellent corrosion resistance to most corrosive media.
  ②Excellent resistance to pitting corrosion, crevice corrosion and stress cracking corrosion.

The situation of Hastelloy in the Chinese market:
Hastelloy has been widely used in China, and major steel mills around the world have set up offices and other institutions in China in order to better serve the domestic market.
Domestic stocking status: pipes, plates, welding materials, forgings, and a number of domestic processing plants have also grown, which can process accessories and other products.
Hastelloy alloys such as Hastelloy C276, Hastelloy B-2, etc. and Monel 400, pure nickel, Inconel600, NS337 and other corrosion-resistant alloys;
The material implements ASTM standards, and an authoritative third party: the National Iron and Steel Material Testing Center provides composition and performance test reports.

Jastelloy Flange C276,C22


Mechanical properties:
1. Hastelloy comes from Hastelloy, starting from Hastelloy B, which is used in rocket nozzles of aircraft; subsequent Hastelloy C has been applied and promoted in the chemical industry, petrochemical industry, nuclear energy industry and pharmaceutical industry; followed by Hastelloy The X-alloy exhibits excellent high temperature resistance, accompanied by the rapid growth of the jet aircraft industry.

2. Since the early Hastelloy B, Hastelloy C, and Hastelloy X alloys need to be solution treated after welding, otherwise, the corrosion resistance of the welding heat affected zone will be greatly reduced; so the above alloys have been gradually improved or No longer use;
The key reason that affects the welding performance of the above materials is the content of C and Si. Due to the emergence and improvement of refining technology, the problems of Hastelloy welding have been improved, so many improved Hastelloy B series are being promoted and used. C series alloys, etc. It is very regrettable that many Hastelloy production and promotion units instead replace the earlier Hastelloy alloy with the later improved Hastelloy alloy, not only does not reduce the C and Si content, but returns to the previous high Si, high C content; the promotion of special steel business has a long way to go.
stainless-steel-Hastelloy c22-coils From China FactoryThe key reason that affects the welding performance of the above materials is the content of C and Si. Due to the emergence and improvement of refining technology, the problems of Hastelloy welding have been improved, so many improved Hastelloy B series are being promoted and used. C series alloys, etc. It is very regrettable that many Hastelloy production and promotion units instead replace the earlier Hastelloy alloy with the later improved Hastelloy alloy, not only does not reduce the C and Si content but returns to the previous high Si, high C content; the promotion of special steel business has a long way to go.

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