INCONEL ALLOY is renowned for its exceptional performance in extreme environments, particularly where high temperatures and corrosive conditions prevail. These nickel-chromium-based superalloys maintain their strength and resist oxidation and corrosion across a wide temperature range, making them indispensable in industries such as oil and gas, aerospace, chemical processing, and marine engineering.
Inconel 600/UNS N06600
Inconel 600 is a solid-solution strengthened alloy primarily composed of nickel and chromium. It offers outstanding resistance to oxidation and corrosion, making it suitable for chemical processing, aerospace, and nuclear engineering applications. The alloy's versatility allows it to withstand various corrosive environments and high-temperature conditions.
Inconel 601/UNS N06601
Building upon the foundation of Inconel 600, Inconel 601 enhances oxidation resistance with the addition of aluminum. This modification forms a protective oxide layer, enabling the alloy to perform exceptionally well in high-temperature environments. Common applications include thermal processing equipment, heat-treating baskets, and components in pollution control systems.
Inconel 617/UNS N06617
Inconel 617 combines nickel, chromium, cobalt, and molybdenum to deliver a superior strength and oxidation resistance balance at elevated temperatures. Its high-temperature strength and corrosion resistance make it ideal for gas turbines, petrochemical processing, and heat exchangers.
Inconel 625/UNS N06625
Noted for its remarkable fatigue and thermal-fatigue strength, Inconel 625 is highly resistant to oxidation and corrosion. This alloy is widely used in aerospace, marine, and chemical processing industries, particularly in applications requiring high strength and resistance to aggressive environments.
Inconel 718/UNS N07718
Inconel 718 is a precipitation-hardenable nickel-chromium alloy containing significant amounts of iron, niobium, and molybdenum, along with lesser amounts of aluminum and titanium. It combines corrosion resistance and high strength with outstanding weldability, including resistance to post-weld cracking. The alloy has excellent creep-rupture strength at temperatures up to 1300°F (700°C), making it suitable for gas turbines, rocket motors, and nuclear reactors.
Chemical Composition (wt%) of Inconel Alloy
| Alloy | Ni | Cr | Fe | Mo | Co | Nb | Al | Ti | Mn | Si | C | Other |
| Inconel 600 | ≥72 | 14-17 | 6-10 | – | – | – | – | – | ≤1 | ≤0.5 | ≤0.15 | Cu ≤0.5, S ≤0.015 |
| Inconel 601 | 58-63 | 21-25 | Balance | – | – | – | 1.0-1.7 | – | ≤1 | ≤0.5 | ≤0.10 | S ≤0.015 |
| Inconel 617 | ≥44.5 | 20-24 | ≤3 | 8-10 | 10-15 | – | 0.8-1.5 | – | ≤0.5 | ≤0.5 | 0.05-0.15 | B ≤0.006, S ≤0.015 |
| Inconel 625 | ≥58 | 20-23 | ≤5 | 8-10 | ≤1 | 3.15-4.15 | ≤0.4 | ≤0.4 | ≤0.5 | ≤0.5 | ≤0.10 | P ≤0.015 |
| Inconel 718 | 50-55 | 17-21 | Balance | 2.8-3.3 | ≤1 | 4.75-5.5 | 0.2-0.8 | 0.65-1.15 | ≤0.35 | ≤0.35 | ≤0.08 | B ≤0.006, Cu ≤0.3 |
Mechanical Properties (Annealed Condition) of Inconel Alloy
| Alloy | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (Rockwell) |
| Inconel 600 | 550 (80 ksi) | 240 (35 ksi) | 30% | B80 |
| Inconel 601 | 550 (80 ksi) | 205 (30 ksi) | 30% | B88 |
| Inconel 617 | 750 (109 ksi) | 345 (50 ksi) | 35% | B95 |
| Inconel 625 | 760 (110 ksi) | 345 (50 ksi) | 30% | B95 |
| Inconel 718 | 1240 (180 ksi) | 1035 (150 ksi) | 12% | C35 |
Product Forms and ASTM Standards
| Alloy | Pipes & Tubes | Plates, Sheets & Strips | Bars & Rods | Forgings | Rings |
| Inconel 600 | ASTM B167 | ASTM B168 | ASTM B166 | ASTM B564 | Custom |
| Inconel 601 | ASTM B167 | ASTM B168 | ASTM B166 | ASTM B564 | Custom |
| Inconel 617 | ASTM B166 | ASTM B168 | ASTM B166 | ASTM B564 | Custom |
| Inconel 625 | ASTM B444, B705 | ASTM B443 | ASTM B446 | ASTM B564 | Custom |
| Inconel 718 | ASTM B983 | ASTM B670 | ASTM B637 | ASTM B637 | AMS 5662 |
Heat Treatment Process of Inconel Alloy
| Alloy | Solution Annealing Temperature | Cooling Method | Precipitation Hardening (if applicable) |
| Inconel 600 | 1010–1150°C (1850–2100°F) | Air cool | Not applicable |
| Inconel 601 | 1065–1180°C (1950–2150°F) | Air cool | Not applicable |
| Inconel 617 | 1120–1205°C (2050–2200°F) | Air cool | Not applicable |
| Inconel 625 | 980–1040°C (1800–1900°F) | Water quench | Not applicable |
| Inconel 718 | 980°C (1800°F) for 1 hr, then 720°C (1325°F) for 8 hrs | Air cool | Yes - age-hardened for high-strength |
Weldability of Inconel Alloy
| Alloy | Weldability Rating | Recommended Welding Process | Post-Weld Heat Treatment |
| Inconel 600 | Excellent | GTAW (TIG), GMAW (MIG), SMAW (Stick) | Not required |
| Inconel 601 | Good | GTAW, GMAW, SMAW | Not required |
| Inconel 617 | Good | GTAW, GMAW | Not required |
| Inconel 625 | Excellent | GTAW, GMAW, SMAW, PAW (Plasma) | Not required |
| Inconel 718 | Moderate (susceptible to cracking) | GTAW, Electron Beam, Laser | Solution annealing is recommended after welding |
Corrosion Resistance Comparison
| Alloy | Oxidation Resistance | Sulfidation Resistance | Acid Resistance | Seawater Resistance |
| Inconel 600 | Excellent up to 1095°C (2000°F) | Moderate | Good (Nitric, Hydrochloric acids) | Moderate |
| Inconel 601 | Outstanding up to 1250°C (2280°F) | Excellent | Limited (resists some acids) | Limited |
| Inconel 617 | Outstanding up to 1100°C (2000°F) | Excellent | Moderate | Limited |
| Inconel 625 | Excellent up to 980°C (1800°F) | Good | Excellent (resists most acids) | Excellent |
| Inconel 718 | Good up to 650°C (1200°F) | Good | Good | Moderate |
Industry-Specific Applications
| Alloy | Aerospace | Oil & Gas | Chemical Processing | Marine & Offshore | Power Generation |
| Inconel 600 | Jet engine components, exhaust liners | Furnace components, heat exchangers | Caustic alkali environments | Not ideal (limited seawater resistance) | Steam superheaters, nuclear reactor components |
| Inconel 601 | Afterburners, combustion cans | Reformer tubes, flare stacks | High-temp sulfur-bearing atmospheres | Not ideal | Gas turbines, heat treating equipment |
| Inconel 617 | Gas turbines, combustion liners | High-temp piping, flue gas systems | High-temperature chemical processing | Limited use | Heat exchangers, petrochemical plants |
| Inconel 625 | Rocket engine thrust chambers, heat shields | Sour gas pipelines, offshore platforms | Acid-resistant piping, scrubbers | Propeller blades, seawater components | Nuclear reactors, waste heat boilers |
| Inconel 718 | Turbine discs, jet engines, space shuttle components | Downhole tools, casing hangers | Acidic environments needing high-strength | Limited use | Gas turbines, cryogenic tanks |
Cost Analysis
| Alloy | Raw Material Cost | Machinability | Welding Cost | Lifecycle Value |
| Inconel 600 | $$ (Moderate) | Fair (work hardens) | Moderate | High (long lifespan in heat/corrosion environments) |
| Inconel 601 | $$ (Moderate) | Fair (better than 600) | Moderate | Very High (superior oxidation resistance) |
| Inconel 617 | $$$ (High) | Difficult (high cobalt content) | High (special handling) | High (high-temp, long-life applications) |
| Inconel 625 | $$$ (High) | Difficult (gummy behavior) | Low (excellent weldability) | Excellent (seawater, acidic environments) |
| Inconel 718 | $$$$ (Very high) | Difficult (age-hardened) | High (crack-sensitive) | Excellent (aerospace, high-stress parts) |
Material Selection Guidance (By Industry)
Aerospace
Inconel 718: Best for jet engines, turbine blades, and rocket motors due to high strength and creep resistance.
Inconel 625: Great for heat shields and exhaust ducts - corrosion-resistant and handles extreme temps.
Recommendation: Use 718 for load-bearing components and 625 for parts exposed to corrosive exhaust gases.
Oil & Gas
Inconel 625: Perfect for sour gas environments, offshore platforms, and heat exchangers - fights pitting, crevice corrosion, and chloride stress corrosion cracking.
Inconel 617: Great for flue gas systems and reformers - withstands high-temp gas exposure.
Recommendation: 625 for corrosion-critical parts, 617 for high-temp exposure.
Chemical Processing
Inconel 600: Handles caustic environments and alkaline conditions, ideal for heat exchangers and piping.
Inconel 625: Superior acid resistance - perfect for scrubbers, ducting, and reactors.
Recommendation: 600 for basic corrosion resistance, 625 for aggressive acids and seawater conditions.
Marine & Offshore
Inconel 625: Best choice for propellers, marine exhausts, and seawater piping - outstanding resistance to saltwater corrosion.
Recommendation: 625 all the way - few alloys can match its marine corrosion performance.
Power Generation
Inconel 601: Excellent for gas turbines, superheater tubing, heat-treating equipment - high temp, oxidation, and carburization resistance.
Inconel 625: Great for nuclear reactors, waste heat boilers, and steam superheaters.
Inconel 718: Ideal for gas turbines under high mechanical loads.
Recommendation: 601 for heat environments, 625 or 718 where strength and corrosion resistance are key.
Our factory
Our nickel-based alloy products originate from a modern precision manufacturing base. The factory is equipped with fully automated vacuum induction melting (VIM), electroslag remelting (ESR), and multi-directional forging hydraulic units, ensuring that every step from melting to forming meets aerospace-grade standards. Through a digital process control system, we achieve precise control over composition purity, grain size, and mechanical properties. Each batch of products is accompanied by traceable melting reports and third-party certifications (such as DNV-GL, ABS, aerospace standards, etc.), ensuring the authenticity and reliability of performance data.
Packaging and shipping
We adopt the highest industry standards for protective packaging: all rods/plates are treated with anti-rust protection and reinforced with waterproof film and wooden crates; precision components are packaged with custom foam dividers and vacuum sealing. Through our proprietary logistics coordination system, we promise that standard specification products will be prepared and shipped within 7-15 working days after order confirmation and technical details are finalized.
