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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.
