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ASTM B444 INCONEL 625 U BEND TUBE HEAT EXCHANGER APPLICATION
UNS N06625: This is the Unified Numbering System (UNS) designation
for the Inconel 625 alloy. It is a standard method of identifying
metals and alloys.
DIN 2.4856: This is the Deutsche Institut für Normung (DIN)
designation for the alloy. DIN is the German Institute for
Standardization, and 2.4856 is the specific number assigned to
Inconel 625.
U Bend Tube: A U Bend Tube is a type of tube that has been bent
into the shape of a "U" to facilitate installation in heat
exchangers or other similar applications. It allows for a compact
design and efficient heat transfer.
The ASTM B444 specification sets the mechanical and chemical
requirements for seamless nickel-chromium-molybdenum-columbium
Inconel 625 tubes intended for high-temperature and
corrosion-resistant applications. It covers various dimensions,
sizes, and manufacturing methods.
Inconel 625 has several advantages, including:
1️⃣ Excellent Corrosion Resistance: Inconel 625 offers exceptional
resistance to corrosion and oxidation, making it suitable for use
in harsh environments such as chemical processing, marine
applications, and offshore oil and gas platforms.
2️⃣ High Strength: Inconel 625 has high tensile strength and
excellent fatigue strength, allowing it to withstand mechanical
stress and perform well in challenging conditions.
3️⃣ High-Temperature Performance: It retains its properties and
integrity at elevated temperatures, making it suitable for
applications in high-temperature environments like gas turbines,
heat exchangers, and power generation.
4️⃣ Good Weldability: Inconel 625 can be easily welded using
conventional techniques, offering flexibility in fabrication and
joining processes.
5️⃣ Versatile Applications: Due to its superior properties, Inconel
625 is used in various industries, including aerospace, chemical
processing, marine, and oil and gas.
Chemical Composition
Cr | Ni | Mo | Co + Nb | Ta | Al | Ti | C | Fe | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20.00-30.00 | Remainder | 8.0-10.0 | 1.0 max | 3.15-4.15 | .40 max | .40 max | .10 max | 5.0 max | .50 max | .50 max | .015 max | .015 max |
Mechanical Properties
Temp° F | Tensile (psi) | .2% Yield (psi) | Elongation in 2"(%) |
|---|---|---|---|
| 70 | 144,000 | 84,000 | 44 |
| 400 | 134,000 | 66,000 | 45 |
| 600 | 132,000 | 63,000 | 42.5 |
| 800 | 131,500 | 61,000 | 45 |
| 1000 | 130,000 | 60,500 | 48 |
| 1200 | 119,000 | 60,000 | 34 |
| 1400 | 78,000 | 58,500 | 59 |
| 1600 | 40,000 | 39,000 | 117 |
Specifications
Pipe Smls | Pipe Welded | Tube Smls | Tube Welded | Sheet/Plate | Bar | Forging | Fitting | Wire |
|---|---|---|---|---|---|---|---|---|
| B444 | B705 | B444 | B704 | B443 | B446 | - | - | - |
Fabrication with Inconel 625
Alloy 625 has excellent forming and welding characteristics. It may be forged or hot worked providing temperature is maintained in the range of about 1800-2150° F. Ideally, to control grain size, finish hot working operations should be performed at the lower end of the temperature range. Because of its good ductility, alloy 625 is also readily formed by cold working. However, the alloy does work-harden rapidly so intermediate annealing treatments may be needed for complex component forming operations. In order to restore the best balance of properties, all hot or cold worked parts should be annealed and rapidly cooled. This nickel alloy can be welded by both manual and automatic welding methods, including gas tungsten arc, gas metal arc, electron beam and resistance welding. It exhibits good restraint welding characteristics.
