Difference Between Inconel 600 and 718
Difference Between Inconel 600 and 718
Inconel 600 is primarily chosen for its high-temperature resistance and good oxidation resistance, making it suitable for furnace components; while Inconel 718 is chosen for its extremely high strength and toughness at temperatures up to 1300°F (704°C). Inconel 718 achieves this property through precipitation hardening, while Inconel 600 is typically strengthened using solid solution.
What are the uses of Inconel 718?
Applications: Inconel 718 is widely used in the aerospace industry, such as in aircraft engine components, turbine disks, and rocket engines. It is also used in equipment in the oil and gas industry, including valves, wellhead components, and downhole tools.
Due to their superior performance in harsh environments, Inconel alloys have become indispensable materials in the field of high-performance metallurgy. Among the many Inconel grades, Inconel 600 and Inconel 718 stand out for their unique properties and wide range of applications. This article will delve into the chemical composition, mechanical properties, and application areas of Inconel 600 and Inconel 718.
Inconel 600
Inconel 600, also known as Nicrofer 716, Pyromet Alloy 600, and Nicrimphy 600, is a nickel-chromium alloy with excellent oxidation resistance and high-temperature corrosion resistance. Due to its high nickel content, Inconel 600 exhibits strong resistance to chloride stress corrosion cracking. Inconel 600 requires no aging hardening treatment and can be hardened and strengthened through cold working alone. Inconel 600 can be used in a temperature range from low temperatures to 700°F (370°C).
Inconel 718
Alloy 718 is a precipitation-hardening nickel-based alloy designed to exhibit extremely high yield strength, tensile strength, and creep rupture strength at temperatures up to 1300°F (700°C). Alloy 718 has a slow aging hardening response, therefore it does not undergo spontaneous hardening during heating and cooling, and can be annealed and welded.
Difference Between Inconel 600 Alloy and Inconel 718 Alloy
Chemical Composition Comparison: Inconel 600 vs. Inconel 718
| Element | Inconel 600 | Inconel 718 |
|---|---|---|
| Nickel (Ni) | ≥ 72.0% | 50.0-55.0% |
| Chromium (Cr) | 14.0-17.0% | 17.0-21.0% |
| Iron (Fe) | 6.0-10.0% | Balance |
| Carbon (C) | ≤ 0.15% | ≤ 0.08% |
| Manganese (Mn) | ≤ 1.0% | ≤ 0.35% |
| Silicon (Si) | ≤ 0.5% | ≤ 0.35% |
| Sulfur (S) | ≤ 0.015% | ≤ 0.015% |
| Copper (Cu) | ≤ 0.5% | ≤ 0.3% |
| Niobium (Nb) | - | 4.75-5.5% |
| Molybdenum (Mo) | - | 2.8-3.3% |
| Titanium (Ti) | - | 0.65-1.15% |
| Aluminum (Al) | - | 0.2-0.8% |
| Cobalt (Co) | ≤ 1.0% | ≤ 1.0% |
Mechanical Properties Comparison: Inconel 600 vs. Inconel 718
| Mechanical Property | Inconel 600 (Annealed) | Inconel 718 (Aged) |
|---|---|---|
| Tensile Strength | 550-655 MPa (80-95 ksi) | 1240-1380 MPa (180-200 ksi) |
| Yield Strength (0.2% Offset) | 240-310 MPa (35-45 ksi) | 1030-1170 MPa (150-170 ksi) |
| Elongation | 35-45% | 12-20% |
| Reduction of Area | 40-55% | 15-25% |
| Hardness (Brinell) | 150-220 HB | 330-410 HB |
| Hardness (Rockwell) | 80-90 HRB | 35-45 HRC |
| Modulus of Elasticity | 214 GPa (31×10⁶ psi) | 200 GPa (29×10⁶ psi) |
| Shear Modulus | 79 GPa (11.5×10⁶ psi) | 76 GPa (11.0×10⁶ psi) |
| Poisson's Ratio | 0.29 | 0.30 |
| Fatigue Strength | 240-310 MPa (35-45 ksi) | 480-550 MPa (70-80 ksi) |
| Creep Rupture Strength | Good at 650°C (1200°F) | Excellent at 650°C (1200°F) |
Application Comparison: Inconel 600 vs. Inconel 718
| Application Area | Inconel 600 | Inconel 718 |
|---|---|---|
| Aerospace | Combustion chambers, thermal processing fixtures | Jet engine components, turbine blades, rocket motors |
| Nuclear Industry | Steam generator tubing, reactor core components | Nuclear reactor fuel elements, structural supports |
| Chemical Processing | Furnace components, heat treatment retorts | High-pressure vessels, valve components |
| Power Generation | Heat exchangers, boiler components | Gas turbine disks, blades, and fasteners |
| Thermal Processing | Heating element sheaths, radiant tubes | High-temperature fixtures and tooling |
| Marine Engineering | Offshore platform components | Subsea equipment, marine turbine components |
| Oil & Gas | Wellhead components in corrosive environments | Downhole tools, high-pressure pumping systems |
| Automotive | - | High-performance racing engine components |
| Medical | - | Surgical implants requiring high strength |
| Industrial | Chemical processing equipment | High-strength fasteners, bolts, and springs |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel also supplies custom Inconel 600 products in various sizes and specifications. Please send us your drawings for a quote!
