Hastelloy C-276 alloy is a nickel-chromium-molybdenum alloy containing tungsten. Because of its extremely low silicon-carbon content, it is considered a universal anti-corrosion alloy. It is mainly resistant to wet chlorine, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts, and has good corrosion resistance in low temperature and medium temperature hydrochloric acid. Therefore, in the past 30 years, in harsh corrosive environments, such as chemical industry, petrochemical industry, flue gas desulfurization, pulp and paper making, environmental protection and other industrial fields have been widely used.
The alloy has the following characteristics:
It has excellent corrosion resistance to most corrosive media in both oxidation and reduction atmospheres.
It has excellent resistance to pitting, crevice corrosion and stress corrosion. The higher content of Mo and Cr makes the alloy resistant to chloride ion corrosion, and the element W further improves the corrosion resistance. At the same time, Hastelloy C-276 alloy is one of the only materials that are resistant to corrosion by moist chlorine, hypochlorite and chlorine dioxide solutions. It is effective for high-concentration chloride solutions such as ferric chloride and copper chloride. Significant corrosion resistance. It is suitable for sulfuric acid solutions of various concentrations and is one of the few materials that can be applied to hot concentrated sulfuric acid solutions.
% Ni Cr Fe Mo W Co C Mn Si S P V Ti
Min. balance 15.0 4.0 15.0 3.0 - - - - - - 0.1 -
Max. 16.5 7.0 17.0 4.5 2.5 0.01 1.0 0.08 0.001 0.015 0.3 -
Tensile strength: σb≥730Mpa, elongation: δ≥40%, hardness: HRB≤100.
The hot forming of Hastelloy C-276 alloy is annealed immediately at 1150°C and quenched with water. Cold deformation of Hastelloy C-276 alloy will increase its strength.
Hastelloy C-276 alloy and ordinary austenitic stainless steel have similar forming properties. However, because it is stronger than ordinary austenitic stainless steel, there will be greater stress during the cold forming process. In addition, the work hardening speed of this material is much faster than ordinary stainless steel, so in the process of extensive cold forming processing, halfway annealing treatment should be adopted.
The physical properties of Hastelloy C-276 alloy are as follows:
Material composition: 57Ni-16Cr-16Mo-5Fe-4W-2.5Co*-1Mn*-0.35V*-0.08Si*-0.01C* *is the maximum a margin
Executive standard: UNS N10276, ASTM B575, ASME SB575, DIN/EN 2.4819
Density: 8.90g/cm3
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