Composition
The first major difference between Inconel Alloy 625 vs 718 is their chemical composition. Both are nickel alloys, but each contains different amounts of a variety of chemicals which distinguish them.
Alloy 625 is primarily nickel-based, whilst Alloy 718 is nickel + cobalt (Ni+Co) based. The use of nickel + cobalt in Alloy 718 means that it has greater hardness and strength. Alloy 625, on the other hand, has higher levels of chromium and molybdenum, so it is more corrosion-resistant. See the full comparison of the chemical composition of Inconel 625 vs 718 below.
Properties
Inconel 625 and Inconel 718 share a number of common properties. Like most nickel alloys, both are high in strength, easily weldable and corrosion-resistant.
However, the different chemical compositions of both alloys mean that they display differing levels of these properties. Whilst both alloys are heat resistant, Alloy 718 has a higher melting range of 1321-1393°C. Similarly, whilst both demonstrate good corrosion resistance, the higher levels of chromium and molybdenum make Alloy 625 more corrosion resistant.
Application
Inconel 625 and Inconel 718 are suitable for a range of industries and applications. However, their respective composition and properties make each alloy excel in certain fields.
Inconel 625 Applications
Inconel 625 is most commonly used in the oil and gas industry due to its excellent corrosion resistance. This makes it the alloy of choice for subsea equipment. It is also used in corrosive environments in the aerospace industry, such as exhaust systems, furnace muffles and engine thrust-reversers.
Inconel 718 Applications
Inconel 718 is a pillar of the aerospace industry. Its exceptional heat resistance makes it ideal for application in high-temperature environments, including engine components. It is also used in high-performance car engines in the motorsport industry.
Product Forms
Both alloy 625 and 718 are easily formable and weldable, so they are readily available in a range of product forms.
Inconel 625 Product Forms
Pipe
Coil
Welding Wire
Sheet and Plate
Round Bar
Pipe Fittings
Flanges
Inconel 718 Product Forms
Round Bar
Sheet and Plate
Welding Wire
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.
