A flange is a disc-shaped or ring-shaped component used to connect pipes, valves, pumps, and other equipment. It connects two flange faces together using bolts to form a sealed connection. When the fluid medium is highly corrosive, high-temperature, or high-pressure, ordinary carbon steel or stainless steel flanges cannot meet the requirements, so more advanced materials such as Hastelloy are needed.

ASTM B564 Hastelloy Flanges Standard Specification

Advantages of  Hastelloy Flanges

Exceptional corrosion resistance: Maintains stability even in highly corrosive environments such as sulfuric acid, hydrochloric acid, phosphoric acid, and hydrofluoric acid.

Superior resistance to stress corrosion: Does not easily crack even in high-temperature and high-stress environments.

High-temperature stability: Some Hastelloy alloys can operate continuously at temperatures above 650°C.

Excellent compatibility: Suitable for connecting with various materials such as stainless steel, duplex steel, and nickel alloys.

Hastelloy Flanges Equivalent Grades

Common Hastelloy Flange Grades

HASTELLOY C276

Hastelloy C276 is an alloy that stands out because of its distinctive blend of elements: nickel, molybdenum, and chromium primarily, with traces of iron, tungsten, cobalt, and other elements. This blend gives the Hastelloy C276 remarkable characteristics, extending these qualities to the flanges crafted from it.

HASTELLOY C22

Hastelloy C22 corresponds to the American standard material grade ASTM B564 UNS N06022. Hastelloy C22 flanges are forged with excellent corrosion resistance, including excellent oxidation resistance, acid and alkali resistance, corrosion resistance, high temperature performance, and good mechanical properties. They are also resistant to various highly acidic solutions and exhibit excellent corrosion resistance in acidic environments.

HASTELLOY B2

Hastelloy B-2 is a nickel-molybdenum alloy renowned for its exceptional corrosion resistance in strongly reducing media.It exhibits extremely high resistance to non-oxidizing acids at all concentrations and temperatures. Due to its unique chemical composition, it effectively resists intergranular corrosion in the heat-affected zone of welds.

HASTELLOY B3

Hastelloy B3 is a nickel-molybdenum alloy and an upgraded version of Hastelloy B2.It inherits the excellent corrosion resistance of B2 alloy in strongly reducing media and exhibits excellent corrosion resistance to non-oxidizing acids at various concentrations and temperatures. B3 alloy offers higher thermal stability, significantly improving manufacturing reliability and service life. Therefore, B3 alloy is a more reliable choice for applications requiring processing of strongly reducing media and demanding higher processing performance.

HASTELLOY C2000

Hastelloy C-2000 is a nickel-chromium-molybdenum-copper alloy, distinguished by the intentional addition of copper to the traditional nickel-chromium-molybdenum system. This alloy is designed to serve as a more versatile single alloy capable of resisting corrosion in both reducing and oxidizing media. Its high chromium content provides excellent oxidation resistance, while the combination of molybdenum and copper confers exceptional corrosion resistance when exposed to reducing acids. As a result, Hastelloy C-2000 demonstrates superior performance compared to many similar alloys in complex chemical environments, particularly in applications where both oxidizing and reducing chemicals are present.

HASTELLOY X 

Hastelloy X is a nickel-chromium-iron-molybdenum alloy renowned for its exceptional high-temperature strength and outstanding oxidation resistance. It maintains high strength and ductility up to 1200°C (2200°F) and effectively resists oxidation, carburization, and chloride stress corrosion cracking. Due to its excellent combination of properties, Hastelloy X is widely used in aerospace gas turbine engine components, industrial furnaces, heat treatment equipment, and the petrochemical industry.

Common Types of Hastelloy Flanges

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

Typical Applications:

Chemical equipment for processing chlorides.

Equipment for acetic anhydride and acetic acid production.                                                                                                                                                     

Pharmaceutical and food industries requiring high purity and corrosion resistance.

Nuclear fuel reprocessing equipment.

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