Inconel 713C vs 718: A Comprehensive Comparison

Inconel alloys, renowned for their exceptional resistance to extreme temperatures and corrosion, have become indispensable in various industries, from aerospace to power generation. This article will provide a detailed comparison of two of the most popular Inconel alloys: Inconel 713C and Inconel 718. We’ll delve into their unique properties, primary applications, similarities, and differences to help you make an informed decision when choosing between them.

What is Inconel?

Inconel is a family of superalloys, primarily composed of nickel and chromium. Their inherent corrosion resistance and high-temperature strength make them ideal for harsh environments where traditional metals, like steel and aluminium, would fail due to thermal-induced crystal vacancies. The Inconel family includes alloys like Inconel 600, 601, 625, 690, and 718, each offering its own unique set of benefits.

Inconel 713C: An Overview

Inconel 713C, a nickel-chromium-molybdenum superalloy, is known for its exceptional performance in extreme temperatures (up to 1500°F). Its strength surpasses other nickel-based superalloys, thanks to its high levels of chromium, molybdenum, and aluminium. These elements enhance oxidation resistance and thermal stability, making Inconel 713C ideal for components such as gas turbine blades, exhaust nozzles, and rocket motors.

Key Properties of Inconel 713C

Inconel 713C is a precipitation hardenable alloy with excellent mechanical properties at elevated temperatures. It offers better corrosion resistance than Inconel 718, largely due to its higher chromium content. However, it’s worth noting that Inconel 713C is generally more expensive than its 718 counterpart.

Inconel 718: An Overview

On the other hand, Inconel 718 is a nickel-chromium-molybdenum superalloy primarily designed for cryogenic temperatures. Its high levels of chromium, aluminium, niobium, titanium, and molybdenum give it excellent creep resistance, making it ideal for turbocharger rotors, fasteners, turbine wheels, and bolts.

Key Properties of Inconel 718

Inconel 718 is an age hardenable alloy that excels in lower temperature applications. It offers excellent corrosion resistance like Inconel 713C, but it’s slightly easier to machine due to its lower levels of carbon. Although it may not be as resistant as 713C, Inconel 718 is a cost-effective choice for many applications.

Inconel 713C vs 718: The Key Differences

The table below provides a quick comparison between Inconel 713C and Inconel 718:

FeaturesInconel 713CInconel 718
Primary ApplicationHigh-temperature environmentsLow-temperature environments
Hardening MechanismPrecipitation hardeningAge hardening
Mechanical Properties at High TemperaturesSuperiorInferior
Corrosion ResistanceHigherLower
MachinabilityLowerHigher
CostMore expensiveLess expensive

The primary difference between these two alloys lies in their applications. Inconel 713C is better suited for higher temperatures, while Inconel 718 excels in lower temperatures.

Conclusion: Choosing the Right Inconel Alloy

When choosing between Inconel 713C and 718, the decision ultimately depends on your application needs. If you require an alloy with good creep resistance at low temperatures, then Inconel 718 could be your best bet. However, if you need something with better oxidation resistance at higher temperatures, Inconel 713C should be your go-to material. Either way, both alloys offer excellent properties, and your choice will depend on your specific requirements.

With this detailed comparison at your disposal, you can now make an informed decision when selecting between these two popular nickel-chromium-molybdenum superalloys.

Please note: All information provided in this article is for reference purposes only. Always consult with a professional or industry expert before making a final decision.

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