Monel Alloy, 904L, Hastelloy C-276, Which One Has Better Corrosion Resistance?

Monel is an alloy based on metallic nickel and adding other elements such as copper, iron, and manganese. It is a corrosion-resistant alloy with large amount, wide application and excellent comprehensive performance. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas medium, and also has excellent corrosion resistance to hot concentrated lye. 904L super austenitic stainless steel is a low-carbon high-nickel, molybdenum austenitic stainless acid-resistant steel. Phosphoric acid has good corrosion resistance, good pitting resistance in neutral chloride ion media, and good crevice corrosion and stress corrosion resistance.

Monel alloy properties: A natural alloy that comes directly from converter grate obtained from reduced nickel ore in Canada. Today it has become an artificially formulated alloy. Based on Ni70Cu30, a series of alloys have been developed, with a composition of 67% nickel, 28% copper, and iron, manganese, silicon and other elements 5%. Melting point is 1349 ° C. The density is 8.8g / cm3. The tensile strength is 448MPa. Elongation rate of 50% (depending on processing). Monel alloy has good corrosion resistance in air, fresh water and sea water, high strength and stable heat resistance. Suitable for manufacturing high strength, high corrosion resistance and antimagnetic parts, such as marine propeller shafts, impellers, pump shafts, heating equipment and medical equipment, chemical structural parts and other inconel properties: a type of nickel alloy. Depending on the composition, there are different properties and uses. Generally resistant to high temperature, oxidation and corrosion. A kind of steel containing 36% nickel and 64% iron. The average linear expansion coefficient is very small. It is used to make solid expansion thermometers. Monel alloy, 904L, Hastelloy C-276, which one has better corrosion resistance?

Hastelloy C-276 Applications:
Digesters and bleach plants in the paper industry.

Components exposed to sour gas.
Equipment for flue-gas desulfurisation plants.
Evaporators, heat exchangers, filters and mixers used in sulfuric acid environments.
Sulfuric acid reactors.
Organic chloride process equipment.
Equipment for processes utilizing halide or acid catalysts.

904L super austenitic stainless steel is a low-carbon high-nickel, molybdenum austenitic stainless acid-resistant steel. It is a proprietary material introduced by the French company H · S. Has good activation-passivation transformation ability, excellent corrosion resistance, good corrosion resistance in non-oxidizing acids such as sulfuric acid, acetic acid, formic acid, and phosphoric acid, and good in neutral chloride-containing media Resistance to pitting corrosion, and has good resistance to crevice corrosion and stress corrosion. It is suitable for sulfuric acid of various concentrations below 70 ° C. It also has good corrosion resistance in acetic acid at any concentration and temperature under normal pressure, and mixed acids of formic acid and acetic acid.

904L Stainless Steel Applications:
petroleum, chemical, natural gas, coal, water conservancy, electric power, machinery, boilers, marine shipbuilding, aerospace, nuclear power plants, papermaking, pharmaceuticals, food, environmental protection, military industry, construction and other industries