Inconel 625 Pipe And Inconel 718 Tubing
Gnee Steel
Inconel 625 vs. Inconel 718 Tubing - Which is Best for Your Application?
Both Inconel 625 pipe and Inconel 718 alloy pipe are excellent choices for piping applications, but they each have different areas of strength. Inconel 625 seamless pipe is best suited for applications that require high corrosion resistance and good weldability, while Inconel 718 round pipe is ideal for high strength and high temperature environments.
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What are the advantages of Inconel 718 pipe?
Inconel 718 alloy pipe is a high-strength, corrosion-resistant nickel-based high-temperature alloy. It has excellent mechanical properties, high-temperature strength, and resistance to oxidation and corrosion. Inconel 718 round pipe is widely used in various industries such as aerospace, oil and gas, automotive, and power generation.
Specifications of inconel 625 Pipe vs inconel 718 Pipe
| Specification | Inconel 718 Pipe | Inconel 625 Pipe |
| Tensile Strength | 135 ksi (930 MPa) | 135 ksi (930 MPa) |
| Melting Point | 2300°F (1260°C) | 2350°F (1290°C) |
| Density | 8.19 g/cm³ | 8.44 g/cm³ |
| Yield Strength | 95 ksi (655 MPa) | 75 ksi (517 MPa) |
Inconel 625 Pipe vs 718 Pipe : Chemical Composition
There are several factors to consider when choosing between Inconel 625 pipe or Inconel 718 seamless pipe for your project. Inconel 625 pipe is primarily composed of nickel and chromium, while Inconel 718 seamless pipe contains nickel, chromium, niobium, and molybdenum. Each alloy has its own strengths and is suitable for different applications.
Inconel 625 alloy pipe is suitable for sour environments, but additional protection may be required in some cases. Inconel 718 pipe, by contrast, is more protective and easier to weld. The final choice depends on your specific needs, so it is important to understand their characteristics before making a decision.
| Element | Inconel 625 Pipe Composition (%) | Inconel 718 Pipe Composition (%) |
| Nickel (Ni) | 58.0 min | 50.0 min |
| Chromium (Cr) | 20.0-23.0 | 17.0-21.0 |
| Molybdenum (Mo) | 8.0-10.0 | 2.8-3.3 |
| Niobium (Nb) + Tantalum (Ta) | – | 4.75-5.50 |
| Iron (Fe) | 5.0 max | 0.0-21.0 |
| Titanium (Ti) | 0.40 max | 0.65-1.15 |
| Aluminum (Al) | 0.40 max | 0.20-0.80 |
| Cobalt (Co) | 1.0 max | 1.0 max |
| Carbon (C) | 0.10 max | 0.08 max |
| Manganese (Mn) | 0.50 max | 0.35 max |
| Silicon (Si) | 0.50 max | 0.35 max |
| Sulfur (S) | 0.015 max | 0.015 max |
| Phosphorus (P) | 0.015 max | 0.015 max |
Inconel 718 Pipe Properties
| Property | Value |
| Density | 8.19 g/cm³ |
| Melting Point | 1260-1340°C (2300-2440°F) |
| Tensile Strength | 1034 MPa (150 ksi) |
| Yield Strength | 724 MPa (105 ksi) |
| Elongation | 12% |
| Modulus of Elasticity | 200 GPa (29.0 x 10^6 psi) |
| Thermal Conductivity | 11.0 W/m·K (at 100°C) |
| Specific Heat Capacity | 447 J/kg·K |
| Coefficient of Thermal Expansion | 13.3 µm/m·K (20-100°C) |
| Electrical Resistivity | 1.22 µΩ·m (at 21°C) |
Inconel 625 Pipe Properties
| Property | Value |
| Melting Point | 1290-1350°C (2350-2460°F) |
| Tensile Strength | 827 MPa (120,000 psi) |
| Density | 8.44 g/cm³ |
| Yield Strength (0.2% offset) | 414 MPa (60,000 psi) |
| Elongation | 30% in 2 inches |
| Hardness (HRC) | 20-30 |
| Thermal Conductivity | 11.5 W/m·K (70°F) |
| Coefficient of Thermal Expansion | 13.3 µm/m-°C (20-100°C) |
| Specific Heat Capacity | 442 J/kg·K (20°C) |
| Electrical Resistivity | 1.29 µΩ·m (20°C) |
| Corrosion Resistance | Excellent resistance to corrosion in many environments, including seawater, acids, and oxidizing chemicals. |
Inconel 625 Pipe vs Inconel 718 Pipe : Industrial Applications
Both Inconel 625 Tube and Inconel 718 Alloy Tube are highly versatile super alloys that offer unique properties for different applications across a wide range of industries.
| Aspect | Inconel 625 | Inconel 718 |
| Chemical Makeup | Primarily nickel and chromium, with additional | Contains nickel, chromium, niobium, and molybdenum, |
| elements like molybdenum and niobium. | among others. | |
| Strength | Offers good strength and toughness, suitable for | Provides superior strength and high-temperature |
| high-temperature applications. | applications, such as aircraft engines. | |
| Corrosion | Excellent corrosion resistance, particularly in | Good corrosion resistance and weldability, making |
| Resistance | acidic environments. | it ideal for harsh environments. |
| Temperature | Can withstand high temperatures, making it | Exhibits excellent resistance to oxidation and |
| Resistance | suitable for heat exchangers and chemical | maintains strength at elevated temperatures. |
| processing equipment. |
Gnee Steel is a supplier of Inconel 625 And Inconel 718 Tubing, covering tubes: Seamless Tubes: Size: 4 - 219 mm; Thickness: 0.5 - 20 mm; Welded Tubes: Size: 5.0 - 1219.2 mm; Thickness: 0.5 - 20 mm, Plates: Plate Thickness 0.1 to 100 mm; Plate Width 10-2500 mm, Strips, Alloy Round Bar Sizes: Diameter 3-800 mm;, Flat Bar Sizes: Thickness 2-100 mm; Width: 10-500 mm, Hexagonal Bar Sizes: 2-100 mm;, Wires and Extruded Profiles. We work with steel mills to provide customers with 625 alloy that meets or exceeds many leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN and BS standards.
Gnee Steel stocks and sells Inconel 625 And Inconel 718 Tubing, Tubes, Pipes, Plates, Strips, Plates, Round Bars, Flat Bars, Forged Billets, Hexagons, Wires and Extrusions. Feel free to contact us for a quote at ss@gneesteel.com
