| The Super Alloys management team are amongst the most experienced professionals in the market. Supported by professional metallurgists and technicians, Super Alloys not only provide access to the largest range of high-tec metals in Europe, but also access to the broadest range of expertise. The unique combination of access to stock, expertise and rapid delivery reduces lead times and can eliminate costly production delays. The Super Alloys range of materials includes: • Titanium Alloys • Nickel Alloys • Steels Nickel Alloy 625 Nickel Alloy 625 is used both for its high strength and outstanding aqueous corrosion resistance. The strength of Nickel Alloy 625 is primarily a solid solution effect from molybdenum and columbium. Nickel Alloy 625 has excellent weldability. The matching filler metals are often used for dissimilar metal joining and to weld the aqueous corrosion alloy AL-6XN®. Features of Nickel Alloy 625 The key features of Nickel Alloy 625 include: • Outstanding resistance to chloride pitting and crevice corrosion cracking • Immune to chloride ion stress corrosion cracking • Resistant to caustics • Resistant to seawater, in both flowing and stagnant • conditions, and under fouling Applications of Nickel Alloy 625 Typical Applications for the Nickel Alloy 625 include: • Chemical process equipment handling mixed acids both oxidizing and reducing • Flue gas desulfurization scrubbers • Evaporators for wet-process phosphoric acid containing H2SO4, HF and ferric salts • Weld Overlay Composition of Nickel Alloy 625 The composition range for Nickel Alloy 625 is provided in table 1. Table 1. Composition of nickel alloy 625. | | | Chromium | 20.00 | 23.0 | | Nickel | 58.00 | Balance | | Molybdenum | 8.00 | 10.00 | | Cobalt | - | 1.00 | | Columbium + Tantalum | 3.15 | 4.15 | | Aluminum | - | 0.40 | | Titanium | - | 0.40 | | Carbon | - | 0.10 | | Iron | - | 5.00 | | Manganese | - | 0.50 | | Silicon | - | 0.50 | | Phosphorus | - | 0.015 | | Sulfur | - | 0.015 | Specifications The various forms of nickel alloy 625 are covered by the following standards: • UNS/W. Nr N06625/2.4856 • Rod and bar ASTM B 446 and ASME SB-446 Gr 1 Physical Properties of Nickel Alloy 625 | Density: | 0.305 lb/inch3 | | Melting Range: | 2350-2460°F | Thermal Properties of Nickel Alloy 625 The thermal properties of Nickel Alloy 625 are summarised in table 2. Table 2. Thermal properties of Nickel Alloy 625. | | | 70 | - | 5.7 | 29.8 | | 400 | 7.3 | 7.2 | 28.4 | | 600 | 7.4 | 8.2 | 27.5 | | 800 | 7.6 | 9.1 | 26.6 | | 1000 | 7.8 | 10.1 | 25.6 | | 1200 | 8.2 | 11.0 | 24.4 | | 1400 | 8.5 | 12.0 | 23.1 | | 1600 | 8.8 | 13.2 | - | Typical Mechanical Properties of Nickel Alloy 625 The minimum mechanical properties of nickel alloy 625 are provided in table 3. Table 3. Minimum Specified Tensile Properties, Room Temperature ASTM B 446 Bar, Grade 1 | | | Ultimate Tensile Strength | 120 ksi | | 0.2% Yield | 60 ksi | | Elongation (2”) | 30% | Corrosion Resistance of Nickel Alloy 625 Table 4. Corrosion by quiet & flowing seawater, Wrightsbille Beach, NC. | | | 625 | Nil | Nil | Nil | 0.25 | Nil | Nil | | C-276 | Nil | Nil | Nil | 0.10 | Nil | Nil | | René 41 | 0.80 | Nil | Nil | 0.30 | Nil | Nil | | X | 0.10 | Nil | Nil | 0.60 | Nil | Nil | | 825 | 0.25 | 0-1 | 0-9 | 0.20 | 3-6 | 1-26 | | 718 | 2.70 | Nil | 37-165P | 5.15 | Nil | 40-165P | Test duration two years. P=perforated by local attack Table 5. Crevice corrosion temperature (CCT). | | | 316L | S31603 | 2.1 | -3 | 27 | 23 | | 825 | N08825 | 2.7 | -3 | 27 | 30 | | 2205 | S31803 | 3.1 | 20 | 68 | 38 | | 317L | S31703 | 3.2 | 2 | 35 | 29 | | AL-6XN® | N08367 | 6.2 | 43 | 110 | 48 | | 625 | N06625 | 9.0 | 45 | 113 | 51 | | C-276 | N10276 | 15.4 | 55 | 130 | 66 | 10% FeCl3.6H2O, per ASTM G 48 Practice B (PRE) N=Cr + 3.3Mo + 16N |