What are Hastelloy fasteners-bolts, nuts, washers
Hastelloy is a nickel-based corrosion-resistant alloy, which is mainly divided into two categories: nickel-chromium alloy and nickel-chromium-molybdenum alloy. Hastelloy has good corrosion resistance and thermal stability, and is mostly used in aviation and chemical fields.
Hastelloy (Hastelloy alloy) is the general name of the commercial grades of nickel-based corrosion-resistant alloys produced by the United States Hastelloy International. Including nickel-molybdenum-based Hastelloy B-2, nickel-chromium-molybdenum-based Hastelloy C-4, etc.
Hastelloy grades include the following grades:
HASTELLOY B-2 nickel-molybdenum alloy has excellent corrosion resistance in reducing environments. The upgraded version of HASTELLOY B-3 B-2 has excellent corrosion resistance to hydrochloric acid of any temperature and concentration.
HASTELLOY C-4 has good thermal stability, good toughness and corrosion resistance at 650-1040 degrees Celsius.
HASTELLOY C-22 has better resistance to uniform corrosion in oxidizing media than C-4 and C-276, and excellent resistance to localized corrosion. HASTELLOY C-276 has good resistance to oxidizing and medium reducing corrosion, and has excellent resistance to stress. Corrosion ability. HASTELLOY C-2000 The most comprehensive corrosion-resistant alloy with excellent uniform corrosion resistance in both oxidation and reduction environments.
An upgraded product of HASTELLOY G-35 G-30, with better corrosion resistance and thermal stability. HASTELLOY G-30 nickel-based alloy with high chromium content, excellent performance in phosphoric acid and other strong oxidizing mixed acid media.
HASTELLOY X combines the characteristics of high strength, oxidation resistance and easy processing. Each of the above grades has specific chemical composition, mechanical properties, and each has its own strengths. It is not possible to generalize on the characteristics of Hastelloy.
Application areas:
Hastelloy fasteners are suitable for various chemical industries containing oxidizing and reducing media. The higher content of molybdenum and chromium makes the alloy resistant to chloride ion corrosion, and the element of tungsten further improves the corrosion resistance. At the same time, C-276 Hastelloy tube is one of the only materials that are resistant to corrosion by humid chlorine, hypochlorite and chlorine dioxide solutions. It is effective for high concentration chloride solutions such as ferric chloride and copper chloride. Significant corrosion resistance.
Application fields, heat exchangers, bellows compensators, chemical equipment, flue gas desulfurization and denitrification, paper industry, aerospace applications, acidic environment.
characteristic:
① It has excellent corrosion resistance to most corrosive media in both oxidation and reduction atmospheres.
②It has excellent resistance to pitting, crevice corrosion and stress cracking corrosion.
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