Inconel 625 Flanges
Inconel 625 Flanges Specification:
- Grade: Inconel 625, UNS N06625
- Standard: ASTM B564
- Type: Alloy Steel
- Form: Flanges (Slip-on Flange, Weld Neck Flange, Blind Flange, Socket Weld Flange, Threaded Flange, Lap Joint Flange, Plate Flange)
- Size: Available in various dimensions (½”, ¾”, 1”, 1 ¼”, 1 ½”, 2”, 2 ½”, 3”, 4”, 5”, 6”, 8”, 10”, 12”, 14”, 16”, 18”, 20”, 24”, 26”, 28”, 30”, 32”, 34”, 36”, 38”, 40”, 42”, 44”, 46”, 48”)
- Pressure Class: 150, 300, 600, 800, 900, 1500, 2500
- End Types: Flanged, Threaded, Welded
Inconel 625 Chemical Composition:
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 58-69 |
| Chromium (Cr) | 20-23 |
| Molybdenum (Mo) | 8-10 |
| Iron (Fe) | 5.0 max |
| Niobium (Nb) | 3.15-4.15 |
| Cobalt (Co) | 1.0 max |
| Titanium (Ti) | 0.4-1.0 |
| Aluminum (Al) | 0.4 max |
| Other elements | Balance |
Mechanical Properties of Inconel 625:
| Property | Value |
|---|---|
| Ultimate Tensile Strength | 1030 MPa (150,000 psi) |
| Yield Strength | 550 MPa (80,000 psi) |
| Elongation (50mm Gauge) | 35% |
| Modulus of Elasticity | 206 GPa |
| Hardness (Rockwell B) | 95 |
Physical Properties of Inconel 625:
| Property | Value |
|---|---|
| Density | 8.44 g/cm³ |
| Melting Point | 1290-1350°C |
| Thermal Conductivity | 10.9 W/m·K @ 100°C |
| Coefficient of Expansion | 13.4 µm/m·°C (20-100°C) |
| Specific Heat | 0.42 J/g·°C @ 25°C |
Possible Alternative Grades:
| Grade | Corrosion Resistance | Heat Resistance | Weldability |
|---|---|---|---|
| Inconel 718 | Good | Excellent | Excellent |
| Hastelloy C-276 | Excellent | Very Good | Excellent |
| Monel 400 | Good | Good | Good |
Chemical Formula:
The chemical formula of Inconel 625 is approximately:
Ni - Cr - Mo - Nb - Fe (C + Ti)This alloy primarily contains nickel (Ni), chromium (Cr), molybdenum (Mo), and niobium (Nb), along with trace amounts of other elements like iron, titanium, and carbon.
Grade Specification Comparison:
| Property | Inconel 625 | Inconel 718 | Hastelloy C-276 | Monel 400 |
|---|---|---|---|---|
| Nickel Content (%) | 58-69 | 50-55 | 52-58 | 63 min |
| Chromium Content (%) | 20-23 | 17-21 | 14-17 | 0-2 |
| Molybdenum Content (%) | 8-10 | 2.8-3.3 | 15-17 | 28-34 |
| Niobium Content (%) | 3.15-4.15 | 5.1-5.5 | 3-5 | <1 |
Corrosion Resistance:
Inconel 625 is renowned for its resistance to a wide variety of corrosive environments, including:
- Acidic Environments: Exceptional resistance to sulfuric acid, phosphoric acid, and hydrochloric acid.
- Oxidizing Environments: Performs well in the presence of oxygen, ozone, nitric acid, and other oxidizing agents.
- Pitting and Crevice Corrosion: Excellent resistance to pitting and crevice corrosion in marine environments.
Heat Resistance:
Inconel 625 is capable of maintaining high strength and resistance to oxidation up to 1,000°F (538°C). It also exhibits outstanding resistance to thermal fatigue and cyclic heating.
- Service Temperature Range: Up to 980°C (1,800°F) for continuous service.
- Oxidation Resistance: Excellent in high-temperature oxidizing environments.
Heat Treatment:
Inconel 625 is generally used in the annealed condition. It is non-heat treatable and exhibits its best properties when processed at high temperatures in its annealed state. Typically, it is solution annealed at 1040-1140°C (1904-2084°F) followed by rapid cooling.
Welding:
Inconel 625 is known for its excellent weldability. It can be welded using a variety of techniques, including TIG, MIG, and SMAW. The weld joints of Inconel 625 show similar high strength and corrosion resistance as the base material.
- Welding Consumables: AWS A5.14 ERNiCrMo-3
- Preheating: Generally not required but may be used to prevent cracking at extremely low temperatures.
Fabrication:
Inconel 625 is relatively easy to fabricate using common methods such as forging, rolling, and machining. However, it requires more care when cutting and machining due to its hardness and toughness.
- Machinability: Generally good but tool wear can be an issue due to its hardness.
- Forming: Excellent formability at elevated temperatures.
Applications:
- Aerospace Industry
- Marine Engineering
- Chemical Processing
- Power Generation
- Marine and Offshore Applications