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ASTM B446 Inconel 625 round bar (UNS N06625) is a nickel-chromium-molybdenum-niobium alloy renowned for its exceptional combination of high-temperature strength, corrosion resistance, and fabricability. Composed of 61% nickel, 21.5% chromium, 9% molybdenum, 3.6% niobium, and trace iron/cobalt, this alloy leverages solid-solution strengthening from molybdenum and niobium carbides to deliver outstanding performance in extreme environments. Manufactured via hot-rolling or cold-drawing to meet standards like ASTM B446 and ASME SB446, the round bar features a uniform microstructure with tight dimensional tolerances (±0.05 mm for diameters ≤50 mm).
Inconel 625’s austenitic matrix remains stable from cryogenic temperatures up to 1093°C, making it ideal for applications requiring both corrosion resistance and mechanical reliability across a broad thermal spectrum.
Exceptional Corrosion Resistance: Resistant to pitting/crevice corrosion in chloride solutions (up to 40,000 ppm Cl⁻), seawater, and mixed acids (e.g., H2SO4 + HNO3). Its high chromium/molybdenum content forms a robust Cr2O3-MoO3 passive film.
High-Temperature Strength: Maintains tensile strength exceeding 760 MPa at 700°C without age-hardening, outperforming most stainless steels in creep and fatigue resistance.
Cryogenic Ductility: Remains ductile at -196°C, making it suitable for liquid nitrogen storage and aerospace cryogenic systems.
Ease of Machining & Welding: Despite its high alloy content, Inconel 625 can be machined with carbide tools (using high lubrication) and welded by GTAW/GMAW with ERNiCrMo-3 filler metal, requiring no post-weld heat treatment.
| Conditon | TEMPERATURE | Tensile Strength ≥ksi(Mpa) | Yield Strength (0.2%Offset), ≥ksi(Mpa) | Elongation，≥ % |
| ANNEALING, ≤4“ | 1600°F(871°C) | 120（827） | 60(414) | 30 |
| ANNEALING，>4"-10" | 1600°F(871°C) | 110(758) | 50(345) | 25 |
| SOLUTION ANNEALING | 2000°F(871°C) | 100(690) | 40(276) | 30 |
Aerospace Turbines: Used for turbine disks, blades, and fasteners in jet engines, resisting hot corrosion from sulfur-bearing fuels at 900-1050°C.
Offshore Oil & Gas: Employed as structural supports, valve components, and subsea connectors in deepwater environments, enduring H2S-rich brines and mechanical stress.
Chemical Processing: Ideal for reactor internals, heat exchanger tubes, and pump shafts handling concentrated salt solutions or organic solvents.
Nuclear Industry: Used in spent fuel pool racks and primary coolant systems due to low activation properties and resistance to radiation-induced corrosion.
