Inconel 625 Seamless Tube & Precision Tube – VIM+ESR Manufacturing, SGS Certified | Shanghai Hangbo Alloy Group
Date: 2026年7月24日 Categories: News Views: 388
Section 1: Grade & Introduction
Inconel 625 (UNS N06625 / W.Nr. 2.4856) is a non-magnetic, corrosion and oxidation-resistant, nickel-based superalloy. Its outstanding strength and toughness in the temperature range from cryogenic up to 1093°C (2000°F) are derived primarily from the solid-solution effects of the columbium (niobium) and molybdenum in a nickel-chromium matrix.
Section 2: Chemical Composition
Precision chemical control is the key to the multi-purpose properties of Inconel 625. Below is the wt.% according to ASTM B443.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | ≥ 58.0 |
| Chromium (Cr) | 20.0 - 23.0 |
| Molybdenum (Mo) | 8.0 - 10.0 |
| Niobium (Nb) + Tantalum (Ta) | 3.15 - 4.15 |
| Iron (Fe) | ≤ 5.0 |
| Aluminum (Al) | ≤ 0.40 |
| Titanium (Ti) | ≤ 0.40 |
| Cobalt (Co) | ≤ 1.00 |
| Carbon (C) | ≤ 0.10 |
| Manganese (Mn) | ≤ 0.50 |
| Silicon (Si) | ≤ 0.50 |
| Phosphorus (P) | ≤ 0.015 |
| Sulfur (S) | ≤ 0.015 |
Section 3: Mechanical & Physical Properties
Physical Properties
- Density: 8.44 g/cm³
- Melting Range: 1290 - 1350°C (2350 - 2460°F)
- Magnetic Permeability (70°F, 200 Oersted): 1.0006
Mechanical Properties (Min. values per ASTM B443)
| Condition | Tensile Strength (MPa) | Yield Strength (0.2% Offset) (MPa) | Elongation (%) |
|---|---|---|---|
| Annealed (Grade 1) | 758 | 379 | 30 |
| Solution Annealed (Grade 2) | 690 | 276 | 30 |
Section 4: Material Characteristics
- Corrosion Resistance: Exceptional resistance to pitting, crevice corrosion, and stress-corrosion cracking.
- High Strength: Maintains properties from cryogenic temperatures up to 1093°C.
- Fatigue Resistance: Excellent fatigue strength and thermal-fatigue resistance.
- Oxidation Resistance: Superior resistance to oxidation and carburization in high-temperature environments.
Section 5: Others
Manufacturing & Processing
Manufactured by hot rolling followed by pickling to remove scale. Annealing (Grade 1) is typically done at 871-1038°C, while Solution Annealing (Grade 2) at 1093°C and above provides better high-temperature creep strength.
Testing
Standard testing includes Ultrasonic Testing (UT), Hydrostatic testing for tubes, and Positive Material Identification (PMI) to ensure alloy purity.
Applications
Crucial for sea-water applications, chemical processing equipment, aerospace engine exhaust systems, and nuclear fuel element components.
Global Cases
Extensively used by companies like SpaceX for rocket engine components and by major oil companies for offshore subsea hardware.
FAQ
- Is Inconel 625 magnetic? No, it is a non-magnetic alloy.
- What is the difference between Grade 1 and Grade 2? Grade 1 is annealed for general strength; Grade 2 is solution annealed for high-temperature creep resistance.
- Can it be used in seawater? Yes, it is one of the best materials for marine environments due to its resistance to chloride ions.
- What is the typical hardness? Usually around 145-220 Brinell in the annealed condition.
- Is it easy to weld? Yes, it has excellent weldability and does not require post-weld heat treatment to maintain corrosion resistance.
