What Is the Most Common Nickel Alloy? | Inconel 718 Guide

Nickel-based superalloys are essential materials for industries that demand high performance under extreme conditions — aerospace, gas turbines, chemical processing, and oil & gas. Among the many nickel alloys available today, one stands out as the most widely used: Inconel® 718.

But what makes Inconel® 718 so popular? And how does it compare to other common nickel alloys? This article provides a comprehensive overview.

What is Inconel® 718?

Inconel 718 is the most common nickel-chromium-molybdenum superalloy. It accounts for approximately 50% of all nickel superalloy production globally and is often referred to as the "workhorse" of the superalloy family.

Its dominance is not accidental. Inconel® 718 offers a unique combination of:

• High tensile strength at temperatures up to 700°C (1300°F)

• Excellent corrosion and oxidation resistance

• Superior weldability — unlike many precipitation-hardened alloys

• Age-hardenability through a simple heat treatment process

• Good fatigue and creep resistance

These properties make it the first choice for engineers designing components that must perform reliably in extreme environments.

Why Is Inconel® 718?

Several factors contribute to the widespread adoption of Inconel 718:

1. Excellent Weldability

Many high-strength nickel alloys are difficult to weld due to cracking issues. Inconel® 718 was specifically designed to overcome this limitation. Its slow precipitation hardening response allows for welding without significant cracking — a major advantage in manufacturing complex assemblies.

2. Outstanding High-Temperature Strength

Inconel® 718 maintains its mechanical properties at temperatures where standard stainless steels would soften or fail. This makes it ideal for jet engines, gas turbines, and rocket motors.

3. Corrosion Resistance

The alloy resists oxidation, pitting, and stress corrosion cracking in aggressive environments, including seawater, acidic conditions, and high-temperature gases.

4. Proven Reliability

Decades of successful use in critical applications — from aerospace fasteners to nuclear reactors — have built an unmatched track record. Engineers trust Inconel® 718 because it has been tested and proven in the field.

Typical Applications of Inconel® 718

Other Common Nickel Alloys 

While Inconel 718 is the most common, several other nickel alloys are widely used for specific applications:

Inconel® 625

• Key feature: Exceptional seawater corrosion resistance

• Common use: Marine engineering, chemical processing, exhaust systems

• Difference from 718: Better weldability and corrosion resistance, but lower high-temperature strength

Monel® 400

• Key feature: Outstanding resistance to hydrochloric and hydrofluoric acids

• Common use: Marine components, chemical plant equipment, valves, pumps

• Note: Monel is nickel-copper, not chromium-bearing like Inconel

Hastelloy® C276

• Key feature: Superior resistance to pitting and stress corrosion cracking

• Common use: Chemical processing, flue gas desulfurization, pulp and paper industry

• Note: Higher molybdenum content than Inconel 718

Incoloy® 825

• Key feature: Excellent resistance to sulfuric and phosphoric acids

• Common use: Chemical tanks, pickling equipment, acid plants

Comparison Table: Inconel® 718 vs. Other Common Nickel Alloys

Forms Available for Inconel® 718

Inconel 718 is available in a wide range of mill product forms, including:

• Round bar

• Flat bar

• Sheet and plate

• Seamless and welded pipe

• Tube

• Wire

• Forgings (rings, discs, blocks, flanges)

• Custom machined components

Why Choose ZYTC Alloy for Your Inconel® 718 Needs?

At ZYTC Alloy, we specialize in supplying high-performance nickel-based superalloys, including Inconel 718. Whether you need standard sizes or custom forgings, we offer:

• Competitive pricing for both small and bulk quantities

• Fast lead times with global shipping options

• Certified materials meeting ASTM, AMS, and customer specifications

• Technical support to help you select the right alloy for your application

Inconel® 718 is the most common nickel alloy for good reason. Its unmatched combination of high-temperature strength, corrosion resistance, weldability, and proven reliability makes it the go-to choice for demanding applications across aerospace, oil & gas, power generation, and chemical processing.

If you have a project requiring Inconel® 718 or any other nickel-based superalloy, ZYTC Alloy is ready to assist. Contact us with your grade, size, and quantity requirements for a fast, competitive quote.