2.4858
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2.4858 is a fully austenitic nickel-iron-chromium alloy, corresponding to grade NCF825 and UNS number N08825 in the US. It is widely used in various industrial fields due to its excellent corrosion resistance and mechanical properties.
Product name：
Inconair
Material：
NCF690
Warehouse：
Tianjin
Surface treatment：
Pickled/bright/black etc. etc.
Keyword：
2.4858
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Details description
Chemical Composition
Nickel (Ni) content is 38%~46%, Chromium (Cr) is 19.5%~23.5%, Iron (Fe) balance, Molybdenum (Mo) 2.5%~3.5%, Copper (Cu) 1.5%~3.0%, Titanium (Ti) 0.6%~1.2%, Carbon (C) ≤0.025%, Manganese (Mn) ≤1.0%, Silicon (Si) ≤0.5%, Cobalt (Co) ≤1.0%, Aluminum (Al) ≤0.2%
Performance Characteristics
Corrosion Resistance: Excellent performance in both oxidizing and reducing environments, resistant to general corrosion, pitting corrosion, crevice corrosion, intergranular corrosion, and stress corrosion cracking, especially suitable for high-chloride environments like seawater.
Mechanical Properties: Tensile strength ≥585 N/mm², Yield strength 0.2% ≥240 N/mm², Elongation ≥30%, Hardness HB30 is 135-165 HB, maintains good mechanical properties from room temperature to 550℃.
Thermal Stability: Certified for manufacturing pressure vessels with a temperature up to 450℃, suitable for high-temperature environments.
Typical Application Scenarios
Chemical Industry: Can be used for heating tubes, containers, etc. in sulfuric acid pickling plants, heat exchangers, evaporators in phosphoric acid production, and air heat exchangers in petroleum refining, etc.
Marine Engineering: Commonly used for seawater-cooled heat exchangers, marine product piping systems, acidic gas environment pipelines, etc.
Nuclear Industry: Can be used in equipment like nuclear fuel dissolvers that can simultaneously handle various corrosive media such as sulfuric acid, nitric acid, and sodium hydroxide.
Other Fields: Also applied in food engineering, chemical processes, flame retardant alloys for high-pressure oxygen applications, and other fields.
Technical Parameters
Density: Approximately 8.14 g/cm³.
Hardness: HBS≥200.
Working Temperature: Usually not exceeding 550℃.
Heat Treatment and Processing Technology
Heat Treatment Process: Softening annealing or stabilization treatment temperature range is 920-980℃, with 940±10℃ being the most suitable. For workpieces thicker than 1.5mm, water quenching or rapid air cooling is recommended to achieve maximum creep resistance.
Hot Working: Suitable hot working temperature is 1150-900℃, and cooling methods can be water quenching or rapid air cooling. Annealing should be performed promptly after hot working to ensure optimal corrosion resistance and suitable crystal structure.
Cold Working: Should be performed after solution treatment, with work hardening rate similar to austenitic stainless steel. An intermediate annealing process should be included when cold working involves a significant amount of deformation.
Welding Process: Suitable for any traditional welding process such as tungsten inert gas welding (TIG), plasma arc welding, etc., for welding with the same material or other metals, with pulsed arc welding being the preferred method. Welding must be performed in the annealed state, and care must be taken to clean off stains, dust, etc., and argon purity must be ensured when welding the weld root.
Qualification certification
Corporate video
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Application fields
Petrochemicals
Petrochemicals
Aerospace
Aerospace
Energy equipment
Energy equipment
Oil/gas/water pipelines
Oil/gas/water pipelines
Building construction
Building construction
Dredging & piling works
Dredging & piling works
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