Inconel 625 u bend tube ASTM B444 UNS N06625 for Aerospace Industry
Seamless U Bend Tube ASTM B444 Inconel 625 UNS N06625 Heat Exchangers
What is Inconel 625?
ASTM B444 is the standard specification for nickel-chromium alloy tubing, which consists of a nickel-chromium-molybdenum-niobium alloy. The main reason why these alloys are considered very useful in the manufacture of high quality tubing products is that it has high resistance to oxidation and corrosion and has a high melting point in both water and high temperature applications. The nickel based alloys are very ductile and therefore can be easily plated and welded, thus making them suitable for a variety of industries where extreme and harsh temperatures are important factors.ASTM B444 Seamless and ASTM B444 Seamless Tubing are suitable for use in aerospace industry piping systems, aviation jet engine exhaust systems, engine thrust reserve systems, specialized seawater equipment, chemical process equipment, etc.
Chemical Composition:
| Element | C | Mn | Si | Fe | S | Cr2 | Al-Ti | Ni |
| min. | - | - | - | - | - | 20.0 | - | 58.0 |
| max. | 0.10 | 0.50 | 0.50 | 5.0 | 0.015 | 23.0 | 0.40 | - |
Inconel 625 Mechanical Properties & Heat Treatment
Mechanical properties of alloy N06625 grade 1 (annealed) pipe: tensile strength ≥ 120 ksi [827 MPa]; yield strength ≥ 60 ksi [414 MPa]; elongation within 2″ ≥ 30%. Mechanical properties of alloy N06625 Grade 2 (solution annealed) pipe: tensile strength ≥ 100 ksi [690 MPa]; yield strength ≥ 40 ksi [276 MPa]; elongation within 2″ ≥ 30%. Annealing heat treatment shall be carried out at a temperature of not less than 1600°F [871°C]. Solution annealing heat treatment shall be performed at a temperature of not less than 2000°F [1093°C] with a subsequent stabilized annealing temperature of at least 1800°F [982°C] to increase sensitivity.
Equivalent of Inconel 625
| Alloy | UNS No | Old British | Euronorm | GOST | Japanese JIS | ||
| BS | En | No | AFNOR | ||||
| Inconel 625 | N06625 | NA 21 | NiCr22Mo9Nb | 2.4856 | NC22DNB4M | ХН75МБТЮ | NCF 625 |
Heat Treated Materials
Condition of Supply |
Heat Treatment (After Forming) | ||||
| Annealed / Spring Temper | Stress relieve at 260-370°C (500-700°F) for 30-60 minutes and air cool. | ||||
| Condition | Approx Tensile Strength | Approx Service Temp. | |||
| Annealed | 800-1000 N/mm2 | 116-145 ksi | -200 to +340°C | -330 to +645°F | |
Typical properties of Inconel 625
Property |
Metric | Imperial |
| Density | 8.44 g/cm3 | 0.305 lb/in3 |
| Melting point | 1350 °C | 2460 °F |
| Co-Efficient of Expansion | 12.8 μm/m.°C (20-100°C) |
7.1x10-6 in/in.°F (70-212°F) |
| Modulus of rigidity | 79 kN/mm2 | 11458 ksi |
| Modulus of elasticity | 205.8 kN/mm2 | 29849 ksi |
Applications:
- Aircraft ducting systems
- Aerospace
- Jet engine exhaust systems
- Engine thrust-reverser systems
- Specialized seawater equipment
- Chemical process equipment
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