What is the UNS number for Inconel 625?
The UNS (Unified Numbering System) code for Inconel 625 is N06625; this designation identifies the specific nickel-based superalloy across various industry standards such as ASTM, ASME, and AMS, ensuring consistency for its use in demanding applications like aerospace, marine, and chemical processing. It can be processed into various practical product forms, including plates, coils, tubes, rods, and wires.
What material is equivalent to uns N06625?
UNS N06625 is the designation for Inconel 625, a high-strength nickel-chromium-molybdenum-niobium superalloy, with key equivalents being DIN/Werkstoff Nr. 2.4856, EN NiCr22Mo9Nb, and trade names like Haynes 625, Nickel 625, and ASTM B446/B444/B704 for various forms, all representing the same corrosion-resistant alloy.
What is the ASTM standard for Inconel 625?
UNS N06625, also known as Inconel alloy 625, is a high-strength, corrosion-resistant nickel-chromium-molybdenum superalloy. It is a critical material for extreme environments, possessing excellent resistance to pitting and crevice corrosion, and high-temperature performance (from cryogenic temperatures up to 980°C/1800°F). It is widely used in aerospace, marine, and chemical industries and typically conforms to ASTM B443, B444, and ASME standards.
| Bar | ASTM B 446, ASME SB 466, AMS 5666, ISO 9723, VdTUV 499, BS 3076 NA21, EN 10095, DIN 17752, ASME Code Case 1935 |
| Rod | ASTM B 446, ASME SB 466, ISO 9723, VdTUV 499, BS 3076 NA21, EN 10095, DIN 17752, SME Code Case 1935 |
| Plate | ASTM B 443, ASME SB 443, AMS 5599, AMS 5869, MAM 5599, ISO 6208, VdTUV 499, BS 3072 NA21, EN 10095, DIN 17750, ASME Code Case 1935 |
| Sheet | ASTM B 443, ASME SB 443, AMS 5599, AMS 5869, MAM 5599, ISO 6208, VdTUV 499, BS 3072 NA21, EN 10095, DIN 17750, ASME Code Case 1935 |
| Pipe Seamless | ASTM B444, ASTM B829, ASME SB 444, ASME SB 829, BS3074 NA21 |
| Pipe Welded | ASTM B705, ASTM B775, ASME SB 705, ASME SB 775 |
| Other | UNS N06625, W. Nr 2.4856, ISO NW6625, NACE MR-01-75, INCONEL 625 (trademark), MSRR 7264 |
Alloy 625 Chemical Composition Limits
| Weight % | Ni | Cr | Mo | Nb + Ta | Fe | Ti | C | Mn | Si | S | P | Al | Co |
| Alloy 625 | 58.0 min | 20 - 23 | 8 -10 | 3.15 -4.15 | 5.0 max | 0.40 max | 0.10 max | 0.50 max | 0.50 max | 0.15 max | 0.15 max | 0.40 max | 1.0 max |
Alloy 625 Mechanical Properties
| Material | Form and Condition | Tensile Strength MPa | Yield Strength (0.2% Offset) MPa | Elongation 4D(%) | Hardness HB | ||
| Ksi | MPa | Ksi | MPa | ||||
| Alloy 625 Bar | Annealed | 120 | 827 | 60 | 414 | 30 | ≤ 287 HB |
| Alloy 625 Sheet | Annealed | 120 | 827 | 60 | 414 | 30 | 145-240 |
| Alloy 625 Tube Seamless and Welded |
Annealed | 120 | 827 | 60 | 414 | 35 | - |
UNS N06625 Applications
Aerospace: Jet engine exhausts, thrust reversers
Marine: Seawater piping, propeller blades
Chemical Processing: Reactors, heat exchangers
Oil and Gas: Downhole equipment, flare stacks
Heat Treatment
625 alloy is heat treated in the solution annealed condition at 1177°C (2150°F) for an adequate period of time depending on thickness of a section.
UNS N06625 Welding
UNS N06625 (Inconel 625) is a high-strength nickel alloy with excellent performance. Common welding methods include GTAW (TIG) and GMAW (MIG). Welding requires a clean surface, and good corrosion resistance is typically achieved without post-weld heat treatment. Additionally, it can be joined to other alloys using 625 filler metal.
What is the difference between Inconel 625 and 825?
Both Inconel 625 and Inconel 825 are nickel-based superalloys, but they are designed for different applications. Inconel 625 contains higher levels of nickel, chromium, molybdenum, and niobium, providing excellent high-temperature strength (up to 980°C / 1800°F), making it ideal for aerospace, marine, and high-temperature chemical process applications. On the other hand, Inconel 825 has added copper and slightly lower nickel content, which enhances its corrosion resistance in reducing acids and chemical environments, while maintaining moderate strength (tensile strength of approximately 515 MPa at room temperature).
In short, the 625 alloy excels in high-temperature, high-strength, and chloride-rich environments, while the 825 alloy is optimized for acid resistance in chemical and industrial applications.
GNEE currently has Inconel 625 alloy products in stock, including plates, sheets, coils, strips, tubes, bars, and wires. In addition, we offer a variety of surface finishes to choose from, such as: No. 1, 2B, 2D, BA, No. 3, No. 4, HL, No. 8, sandblasting, etc.
We guarantee 100% quality. We will never deliver any defective products to our customers. Please contact us to customize your required product specifications, including shape, condition, surface treatment, and processing methods.
