Hastelloy has four properties

The alloy, Hastelloy C-276, is a special alloy material with excellent properties, its characteristics are as follows:

Chemical stability

In oxidizing and reducing environments, Hastelloy C-276 alloy can resist the erosion of various corrosive media, showing excellent corrosion resistance.

It has excellent resistance to pitting, crevices and stress corrosion, thanks to its high molybdenum (Mo) and chromium (Cr) content, which make the alloy resistant to chloride ions.

The addition of tungsten (W) further enhances the corrosion resistance of the alloy.

Hastelloy C-276 is one of the few materials that can withstand the corrosion of humid chlorine, hypochlorite and chlorine dioxide solutions, and it also exhibits significant corrosion resistance to high concentrations of chloride salt solutions, such as ferric chloride and copper chloride.

In addition, 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.

Physical properties

The material composition of Hastelloy C-276 consists of 57% nickel (Ni), 16% chromium (Cr), 16% molybdenum (Mo), 5% iron (Fe), 4% tungsten (W), a maximum allowance of 2.5% cobalt (Co), 1% manganese (Mn), 0.35% vanadium (V), 0.08% silicon (Si), and 0.01% carbon (C).

It complies with several international and regional standards, including UNS N10276, ASTM B575, ASME SB575, DIN/EN 2.4819 and others.

The alloy has a density of 8.90g/cm³.

Mechanical properties

The tensile strength of Hastelloy C-276 alloy reaches or exceeds 730Mpa, and the elongation is not less than 40%.

When hot forming, the alloy should be immediately annealed at 1150 ° C and water quenched.

Cold deformation processing can increase the strength of the alloy, but it should be noted that due to its high strength, compared with ordinary austenitic stainless steel, greater stress will be generated during the cold forming process.

Because the work hardening rate of Hastelloy C-276 alloy is faster than that of ordinary stainless steel, it is necessary to take intermediate annealing treatment in the extensive cold forming process to avoid excessive hardening.

Welding and heat treatment

The welding performance of Hastelloy C-276 alloy is similar to that of ordinary austenitic stainless steel. Before any welding method is adopted, measures must be taken to ensure that the corrosion resistance of the weld and the heat affected zone is minimized.

Suitable welding methods include tungsten gas shielded welding (GTAW), metal gas shielded welding (GMAW), submerged arc welding, etc. These methods help maintain the corrosion resistance of the weld and the heat affected zone.

Not suitable welding methods include oxy-acetylene welding and other methods that may increase the carbon or silicon content of the weld and heat affected zone of the material, as this will reduce the corrosion resistance of the material.