At MyT Machining, we deliver high-precision CNC machining solutions for industries where strength, heat resistance, and corrosion protection are mission-critical. One of the most challenging—and essential—materials we work with is machining Inconel 718, a superalloy trusted in aerospace, marine, and energy applications. With advanced machining capabilities and deep material expertise, we ensure each component meets exact specifications and performs under extreme conditions.
What Is Inconel 718?
Inconel 718 is a nickel-chromium superalloy known for its remarkable combination of mechanical strength, oxidation resistance, and stability at high temperatures. It’s part of the Inconel family, but its unique composition—which includes niobium, molybdenum, titanium, and aluminum—offers better weldability and age-hardening capabilities than many similar alloys.
Key Properties of Inconel 718:
High tensile and yield strength even at elevated temperatures (up to 1300°F)
Superior corrosion resistance in harsh environments
Excellent fatigue and creep resistance
Age-hardenable, which enhances strength without compromising ductility
Good machinability, relative to other high-temperature alloys, when proper techniques are used
Why Inconel 718 Is Used in Demanding Industries
Inconel 718 is commonly used in industries where materials must retain strength and performance in extreme environments. Below are a few examples of its applications:
Aerospace
Jet engine components (discs, blades, fasteners)
Structural parts exposed to heat and vibration
High-performance springs and brackets
Oil & Gas
Downhole tools
Valve bodies
Compressor parts
Power Generation
Gas turbines
Nuclear reactor parts
Heat exchangers
Marine & Defense
Subsea components
Exhaust ducts
Missile systems
The alloy's resistance to heat, wear, and corrosion makes it ideal for environments where failure is not an option.
Challenges in Machining Inconel 718
Despite its popularity, Inconel 718 is notoriously difficult to machine due to its material characteristics. It’s abrasive, work-hardens quickly, and retains heat—each of which can shorten tool life and affect precision if not handled correctly.
1. Work Hardening
This alloy hardens rapidly under pressure and heat, which can cause tools to rub rather than cut, degrading the tool and the part finish.
2. Heat Retention
Inconel 718 has low thermal conductivity, meaning heat accumulates at the cutting zone. Without adequate coolant and tool design, this can quickly wear down the cutting edge.
3. Tool Wear
The combination of heat, strength, and abrasiveness makes tooling selection critical. Inferior tools will chip, dull, or break during machining.
4. Chip Control
Producing short, consistent chips is difficult with Inconel 718. Long chips can wrap around tooling and damage parts or interrupt automated processes.
Best Practices for Machining Inconel 718
At MyT Machining, we apply proven techniques, advanced technology, and real-world experience to successfully machine Inconel 718 parts at scale.
Use of High-Quality Tooling
We use carbide inserts with multi-layer coatings such as TiAlN (Titanium Aluminum Nitride) to withstand high temperatures and wear.
Optimized Speeds and Feeds
Lower cutting speeds: typically around 20-60 m/min
Higher feed rates: to reduce tool dwell and prevent work hardening
Shallow depth of cut: for finishing passes to maintain tolerance
Proper Coolant Application
We use high-pressure, through-tool coolant delivery systems to effectively manage heat and flush away chips.
Rigid Setups
To eliminate vibration and deflection, our machines use rigid fixturing and tool holders designed for high-load materials.
Advanced CNC Techniques
Trochoidal milling to maintain consistent chip load
Peck drilling for deep holes
Thread milling for better control and less stress on threads
Multi-axis CNC machining for complex geometries and internal features
Surface Finishing and Quality Control
Post-machining finishing and inspection are vital for Inconel 718 components used in critical industries.
Finishing Processes
Shot peening to increase fatigue strength
Grinding and polishing for fine surface finishes
Passivation to enhance corrosion resistance
Electropolishing for medical or aerospace-grade parts
Quality Assurance
Our team uses precision metrology tools including CMMs (Coordinate Measuring Machines) and non-destructive testing (NDT) methods like dye penetrant and ultrasonic inspection to ensure flawless results.
Inconel 718 vs. Other Alloys
Compared to other superalloys and high-performance materials, Inconel 718 strikes a unique balance between cost, machinability, and performance.
| Material | Strength @ High Temp | Corrosion Resistance | Machinability |
|---|---|---|---|
| Inconel 718 | Excellent | Excellent | Moderate |
| Titanium Grade 5 | Good | Good | Moderate |
| Hastelloy X | Very High | Excellent | Poor |
| Stainless 316 | Fair | Very Good | Good |
While more challenging to machine than stainless steel, Inconel 718 outperforms it in temperature and fatigue resistance—making it worth the investment in high-performance environments.
Why Choose MyT Machining for Inconel 718 Projects?
We bring years of proven experience, industry certifications, and cutting-edge equipment to every Inconel 718 project we take on. Whether you need rapid prototyping, small-batch runs, or full-scale production, we tailor our solutions to meet your application’s exact needs.
What You Can Expect:
CNC experts with deep knowledge of nickel-based superalloys
Strict quality control systems and documentation
On-time delivery and scalable production
In-house engineering support for part design and optimization
Final Thoughts
Machining Inconel 718 is not for the inexperienced. It requires advanced tools, careful planning, and precision at every step. But when executed correctly, the results are unmatched—parts that withstand punishing environments and deliver long-term performance.
At MyT Machining, we combine state-of-the-art CNC technology with unmatched material expertise to machine Inconel 718 components that exceed industry expectations. Whether you're working in aerospace, power generation, or beyond, we're ready to help you push the boundaries of performance.