Inconel 625 UNS N06625 supplier manufacturer with good price, contact us to get free quote and sample!
Inconel 625 UNS N06625 is a renowned nickel-based superalloy known for its exceptional properties, but within this alloy category, there are variations. Two common grades are Inconel 625 Grade 1 and Inconel 625 Grade 2, each tailored to specific applications.
Chemical Composition:
- Inconel 625 Grade 1: Grade 1 typically contains a higher nickel content, usually exceeding 58%. It also features significant levels of chromium (20-23%), molybdenum (8-10%), and niobium (3.15-4.15%). This composition makes it a corrosion-resistant powerhouse, especially against chloride-induced stress corrosion cracking (SCC).
- Inconel 625 Grade 2: Grade 2, on the other hand, has a slightly different chemical composition. It maintains similar levels of chromium, molybdenum, and niobium but features a lower nickel content, approximately 50%. This lower nickel content distinguishes it.
Heat Treatment Differences:
While both grades share similarities in heat treatment processes like solution annealing, there may be variations:
- Inconel 625 Grade 1: Typically undergoes solution annealing at temperatures around 1,600°F (approximately 871°C). Grade 1 is a better choice for corrosive environments.
- Inconel 625 Grade 2: Requires solution annealing at higher temperatures, approximately 2,000°F (about 1,093°C). Grade 2 has better high-temperature stability and strength.
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ASTM B443 Inconel 625 Plate Mechanical Behavior
| Grade | Product | Tensile Strength min, psi (MPa) |
Yield Strength 0.2 % Offset, min, psi (MPa) |
Elonga tion in 2 in. or 50 mm, min, % |
|
| Grade1 | annealed | Cold-rolled sheet and strip | 120(827) | 60(414) | 30 |
| Hot-rolled sheet and hot-rolled plate up to 2.75 in. (70 mm), incl | 110(758) | 55(379) | 30 | ||
| Cold-rolled plate up to 0.375 in. (9.5 mm), incl | 110(758) | 55(379) | 30 | ||
| Grade2 | solution annealed | Cold-rolled sheet and strip, hot-rolled sheet, cold-rolled plate, and hot-rolled plate | 100(690) | 40(276) | 30 |
Main Applications:
- Inconel 625 Grade 1: Grade 1 is often chosen for applications where exceptional corrosion resistance is vital, especially in marine environments or situations involving chloride exposure. It is commonly used in the petrochemical industry, offshore, and aerospace sectors.
- Inconel 625 Grade 2: Grade 2 shines in high-temperature applications. Its focus lies in maintaining strength and creep resistance at elevated temperatures. Therefore, it is preferred in applications such as gas turbine engine components, industrial furnaces, and high-temperature heat exchangers.
Frequently Asked Questions(faq)
Q: What is the difference between Inconel 625 Grade 1 and Grade 2?
The main difference is carbon content. Grade 1 has ≤ 0.10% carbon (more formable), while Grade 2 has ≤ 0.15% carbon (higher strength). Both offer excellent corrosion resistance and high-temperature performance.
Q: Which Inconel 625 grade is better for marine applications?
Both grades offer excellent resistance to seawater and chloride-induced stress corrosion cracking. Grade 1 is often preferred for its better formability in complex marine hardware, while Grade 2 suits high-pressure components.
Q: What are the mechanical properties of Inconel 625 Grade 1?
Typical properties: Yield Strength ≥ 275 MPa (solution treated), Tensile Strength ≥ 690 MPa, Elongation ≥ 30%. Lower carbon content maintains excellent ductility and formability.
Q: What are the mechanical properties of Inconel 625 Grade 2?
Typical properties: Yield Strength ≥ 379 MPa, Tensile Strength ≥ 827 MPa, Higher hardness due to higher carbon content. Better suited for applications requiring higher strength.
Q: Can Inconel 625 Grade 1 and Grade 2 be welded?
Yes, both grades offer excellent weldability using standard techniques. The low carbon content minimizes carbide precipitation. Use matching filler metals (ERNiCrMo-3) for optimal results.
Q: Which industries use Inconel 625?
Both grades are widely used in aerospace, chemical processing, marine engineering, pollution control, nuclear reactors, and oil & gas industries for components requiring high strength and corrosion resistance.
Procurement Advice for Engineering Projects
Selecting the wrong grade can lead to catastrophic failure in high-pressure systems. Always verify your material with a Mill Test Certificate (MTC) that specifies the heat treatment condition.
Looking for a reliable Alloy 625 material supplier? Contact our technical team today for a competitive quote on Inconel 625 Grade 1 and Grade 2 seamless pipes and bars.
