TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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718 Inconel Alloy Round Tubes
Inconel 718 is a nickel alloy designed to resist a wide range of severely corrosive environments, pitting and crevice corrosion. This nickel steel alloy also displays exceptionally high yield, tensile, and creep-rupture properties at high temperatures. This nickel alloy is used from cryogenic temperatures up to long term service at 1200° F. One of the distinguishing features of Inconel 718’s composition is the addition of niobium to permit age hardening which allows annealing and welding without spontaneous hardening during heating and cooling. The addition of niobium acts with the molybdenum to stiffen the alloy’s matrix and provide high strength without a strengthening heat treatment. Other popular nickel-chromium alloys are age hardened through the addition of aluminum and titanium. This nickel steel alloy is readily fabricated and may be welded in either the annealed or precipitation (age) hardened condition.
Inconel 718 Tube Chemical Composition
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr |
| Inconel 718 | 0.08 max | 0.35 max | 0.35 max | 0.015max | 0.30 max | – | 50.00 – 55.00 | 17.00 – 21.00 |
Inconel 718 Tube mechanical properties
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Inconel 718 | 8.2 g/cm3 | 1350 °C (2460 °F) | Psi – 1,35,000 , MPa – 930 | Psi – 75,000 , MPa – 482 | 45 % |
Inconel 718 Tube Physical Properties
| | Solution Treated | Solution Treated and Aged |
|---|---|---|
| Density | 0.296 lb/in3 (8.192 g/cm3) | 0.297 lb/in3 (8.22 g/cm3) |
| Specific Gravity | 8.19 | 8.22 |
| Melting Range | 2500-2600°F | 1370-1430°C |
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