Pipe Fittings Hastelloy C276 Nickel Alloy Long Radius Seamless 1''-24'' SCH 40 1.5D 90 Degree Elbow

Hastelloy C-276 alloy is a tungsten-containing nickel-chromium-molybdenum alloy that is considered a universal corrosion-resistant alloy due to its extremely low silicon-carbon content. Mainly resistant to wet chlorine, various oxidizing chlorides, chlorinated salt solutions, sulfuric acid and oxidizing salts, and have good corrosion resistance in low temperature and medium temperature hydrochloric acid. Therefore, in the past three decades, it has been widely used in harsh corrosive environments, such as chemical, petrochemical, flue gas desulfurization, pulp and paper, environmental protection and other industrial fields.

The alloy has the following properties:

①In the state of oxidation and reduction, it has excellent corrosion resistance to most corrosive media.

②It has excellent resistance to pitting corrosion, crevice corrosion and stress corrosion. The higher content of Mo and Cr makes the alloy resistant to chloride ion corrosion, and W element further improves the corrosion resistance. At the same time, Hastelloy C-276 alloy is one of the only materials resistant to the corrosion of wet chlorine, hypochlorite and chlorine dioxide solutions. Significant corrosion resistance. It is suitable for sulfuric acid solutions of various concentrations and is one of the few materials that can be used in hot concentrated sulfuric acid solutions.

Tensile strength: σb≥730Mpa, elongation: δ≥40%, hardness: HRB≤100.

The hot forming of Hastelloy C-276 alloy is immediately annealed at 1150°C and quenched with water. Cold working of Hastelloy C-276 alloy increases its strength.

Hastelloy C-276 alloy and ordinary austenitic stainless steel have similar formability. However, because it is stronger than ordinary austenitic stainless steel, there will be greater stress during cold forming. In addition, the work hardening rate of this material is much faster than that of ordinary stainless steel, so in the extensive cold forming process, halfway annealing is required.

The various corrosion data of Hastelloy C-276 alloy are typical, but they cannot be used as specifications, especially in unknown environments, and materials must be tested before they can be selected. There is not enough Cr in Hastelloy C-276 alloy to resist corrosion in strongly oxidizing environments, 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.

The mechanical properties of Hastelloy are very outstanding. It has the characteristics of high strength and high toughness, so it has certain difficulties in machining, and its strain hardening tendency is extremely strong. When the deformation rate reaches 15%, it is about 18-8 Twice as much as stainless steel. Hastelloy also has a medium temperature sensitization zone, and its sensitization tendency increases with the increase of deformation rate. When the temperature is high, Hastelloy is easy to absorb harmful elements, which reduces its mechanical properties and corrosion resistance.

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