Inconel 718 is widely used in applications requiring high strength, corrosion resistance, creep resistance, and high-temperature performance, especially excelling in the aerospace, energy, and marine engineering sectors.
Density of Inconel 718 in Different Units
| Unit | Density | Description |
| g/cm³ (grams/cm³) | 8.19 g/cm³ | Most commonly used unit |
| kg/m³ (kilograms/m³) | 8,190 kg/m³ | Metric unit for volume mass |
| lb/in³ (pounds/in³) | 0.296 lb/in³ | Imperial unit for small volumes |
| lb/ft³ (pounds/ft³) | 511 lb/ft³ | Imperial unit for larger volumes |
Why Do We Need to Know the Density of Inconel 718?
1. Weight Calculation
Essential for calculating component weight, especially critical in aerospace and energy industries.
🔧 Example 1: Weight Calculation of an Inconel 718 Round Bar
Assumptions:
Diameter = 50 mm
Length = 1,000 mm
Density = 8.19 g/cm³ = 8,190 kg/m³
Volume calculation:
Cylinder volume = π × (diameter / 2)² × length
= 3.1416 × (0.05 / 2)² × 1
= 0.0019635 m³
Weight calculation:
Weight = Volume × Density
= 0.0019635 × 8,190 ≈ 16.07 kg
📌 Result:
A φ50 mm × 1,000 mm Inconel 718 round bar weighs approximately 16.07 kg theoretically.
2. Material Selection Comparison
Compare density with other metals (e.g., stainless steel, titanium alloy) to assess weight and strength trade-offs.
🔍 Example 2: Material Comparison
| Material | Density (g/cm³) | Notes |
|---|---|---|
| Inconel 718 | 8.19 | High strength, corrosion-resistant, for high-temp parts |
| Stainless Steel 316L | 7.98 | Good corrosion resistance, lower cost, for general use |
| Titanium Alloy Ti-6Al-4V | 4.43 | Low density, lightweight yet strong, ideal for aerospace |
📌 Application Insight:
If weight reduction is a priority → Titanium alloy
If high-temperature strength and corrosion resistance are also needed → Inconel 718 is superior
3. Quality Control
Density measurement can help verify material purity and detect internal voids or defects.
4. Process Simulation and Engineering Analysis
In simulations such as Finite Element Analysis (FEA) or Computational Fluid Dynamics (CFD), density is a key physical input parameter.
Factors Affecting the Density of Inconel 718
● Composition Variations
Inconel 718 is a nickel-based alloy containing nickel, chromium, iron, molybdenum, niobium, etc. Minor changes in elemental composition can affect the alloy’s density.
● Processing Conditions
Heat treatments (e.g., solution annealing, aging) or cold working can alter the crystalline structure’s compactness, slightly influencing density.
● Impurities or Porosity
During casting, forging, or additive manufacturing (e.g., 3D printing), the presence of micro-voids or inclusions may result in actual density being lower than the theoretical value.
Inconel 718 Available Forms
- Pipes & Tubes (Seamless & Welded)
- Forged Flanges
- Fittings (Elbow, Tee, Reducer, Cap)
- Plates & Sheets
- Rods, Bars, and Fasteners
Standards & Specifications
- ASTM B637, AMS 5662 / 5663
- UNS N07718, DIN 2.4668
- ISO 15156 / NACE MR0175
- ASME Boiler & Pressure Vessel Code approved
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