Hastelloy | Quickly Understand What are the Main Hastelloy Grades / Types.

Overview

Hastelloy are generally nickel-chromium-molybdenum alloys. Compared with Inconel, Hastelloy alloy has more molybdenum added. Molybdenum element brings better reduction resistance to the alloy and increases the overall corrosion resistance of the alloy. At the same time, molybdenum also increases the strength of the alloy to a certain extent. In this article, we will introduce the different Hastelloy types one by one.

Hastelloy Types

Hastelloy B

Hastelloy B is resistant to corrosion by reducing medium, suitable for manufacturing equipment for hot concentrated hydrochloric acid and hydrogen chloride gas. It features good strength at 1095 °C, used for old-fashioned internal combustion engines and rocket engine components.

Hastelloy B-2

Hastelloy B-2 exhibits excellent corrosion resistance to strong reducing chemicals such as hydrochloric acid and aluminum chloride catalyst. This alloy also has good intergranular corrosion resistance, suitable for equipment in hydrochloric acid and medium-concentration sulfuric acid (especially at high temperatures) environments.

B-2

Hastelloy B-3

Hastelloy B-3 is a nickel-molybdenum alloy containing about 28% molybdenum. This alloy can withstand atmospheric pressure of any concentration and hydrochloric acid of any temperature with the corrosion rate at less than 0.5mm/year

B-3

Hastelloy C

Though sharing similar basic corrosion resistance like NS334 alloy, Hastelloy C exhibits better radiation resistance.

Hastelloy C-4

Hastelloy C-4 is corrosion resistant to chloride-containing oxidation or reduction. It features good thermal stability, suitable for wet chlorine, hypochlorous acid, sulfuric acid, hydrochloric acid, mixed acid, chloride device and direct application after welding. The alloy exhibits good high-temperature stability, toughness and corrosion resistance in temperatures ranging from 650 ° C to 1040 ° C, with its basic corrosion resistance same as that of NS334.

C-4

Hastelloy C-22

Hastelloy C-22 can be referred as an all-round nickel-chromium-molybdenum-tungsten alloy. It features better overall corrosion resistance than other existing nickel-chromium-molybdenum alloys. Hastelloy C-22 alloy has excellent resistance to pitting corrosion, crevice corrosion and stress corrosion cracking. Besides, it exhibits excellent resistance to aqueous solvents, including wet chlorine, nitric acid or mixed acid with chloride-ions-containing oxidizing acids.

C-22

Hastelloy C-276

Hastelloy C-276 is a corrosion-resistant alloy with many excellent properties, such as good resistance to oxidizing and moderate reducing corrosion, excellent stress corrosion cracking resistance and good local corrosion resistance. Hastelloy C-276 exhibits satisfactory corrosion resistance in many chemical process media, including strong corrosive mineral acid solutions, chlorine and various chloride-containing media, dry chlorine, formic acid and acetic acid, acid anhydride, seawater, brine and etc.

C-276

Hastelloy C-2000

Hastelloy C-2000 is a nickel-based super alloy composed of 55% nickel and other elements like molybdenum, chromium, copper and etc. It is an optimized alloy developed to expand the material applications.

C-2000

Hastelloy G-3

Hastelloy G-3 is a high-performance nickel-based corrosion-resistant alloy. It belongs to Ni-Cr-Fe alloy group that contains Mo and Cu. The super alloy features excellent resistance to oxidation, atmospheric corrosion and stress corrosion cracking. Hastelloy G-3 also has high resistance to local corrosion, such as pitting corrosion and crevice corrosion.

G-3

Hastelloy G-30

Hastelloy G-30 is a high-chromium nickel-based alloy that has better corrosion resistance than most other nickel-based and iron-based alloys in environments mixed with commercial phosphoric acid and many highly oxidizing acid media, such as nitric acid/hydrochloric acid, nitric acid/hydrofluoric acid, and sulfuric acid. G-30 alloy can prevent welding heat from affecting the formation of grain boundary precipitation within the heating zone, so the welded product is applicable to various chemical treatment projects.

G-30

Hastelloy G-35

Hstelloy G-35 features outstanding resistance to pitting and crevice corrosion in the halogenide medium and sulfuric acid-containing acidic environment, effectively resistant to chloride ion stress corrosion. Hstelloy G-35 also has good corrosion resistance and stability in oxidizing and reducing media, with slightly better mechanical properties than 904L. It can be used for manufacturing pressure vessel at temperatures ranging from -196 to 400 °C.

G-35

Hastelloy X

Hastelloy X is a nickel-chromium-molybdenum alloy with addition of the cobalt and tungsten. It exhibits excellent oxidation resistance at temperatures up to 1200 ° C and can also be used in neutral and reducing atmospheres. Meanwhile, alloy Hastelloy X is resistant to carbonization and nitriding atmosphere.