Characteristics of Inconel 625

Superalloys were created because there were commercial and industrial needs that pure metals and traditional alloys could not fulfill. Like all alloys, Superalloys optimize the natural strengths of selected materials in order to achieve high performance and corrosion resistant reliability, even at temperatures exceeding 1000F. Superalloys can be divided into several different categories and are often identified by brand names from various manufacturers depending on the primary elements of the final alloy. Some common nickel-based superalloys include Inconel, Incoloy, and Monel.

A widely used nickel-based superalloy is UNS N06625 which is also commonly known as Inconel 625. Inconel alloys are comprised of at least 50% of nickel. Chromium (Cr) is the secondary material for Inconel 625, and accounts for 20.0 – 23.0% of the final alloy in mass. The rest of the final alloy consists of various materials including iron (Fe), molybdenum (Mo), and a mixture of both Niobium (Nb) and tantalum (Ta). Trace amounts of silicon (Si), cobalt (Co), aluminum (Al), titanium (Ti) and other materials are also found in Inconel 625.

These elements are used to enhance specific traits to Inconel 625. For example, there is a reason why chromium is the secondary material in Inconel 625. Chromium offers great corrosion resistance to water, acid and other natural elements. The use of niobium and tantalum provides the final alloy with enhanced mechanical properties. The use of molybdenum aids in both resistance to corrosion and overall alloy strength, but also helps make Inconel 625 more suitable for welding.

Here is the complete chemical analysis for Inconel 625.

Element Proportion (Mass %)

Alloy (UNS) Ni Fe Si C S Mg Al Ti Cr Mo Nb & Ta Co P
N06625 ≥58.0 5.0 max 0.50 max 0.010 max 0.015 max 0.5 max 0.4 max 0.4 max 20.0 – 23.0 8.0 – 10.0 3.15 – 4.15 1.0 max 0.015 max

Inconel 625 is known for having incredible strength and resistance to heat at elevated temperatures. Inconel 625 can withstand immense pressure and possesses high resistance to corrosion from the elements including prolonged exposure to saltwater and oxygen.

Because of these characteristics, using Inconel 625 continues to be in high demand for many different sectors. Several industries that require superalloys include aircraft engines, commercial space applications, oil and gas, power generation, chemical and petrochemical processing and anywhere else there may be an application within a harsh environment.

Inconel 625 Forging Applications

Given the characteristics of Inconel 625, this alloy continues to be a popular choice for various forging applications. Inconel 625 can be used to form parts that come in many different shapes.

Inconel 625 can be formed into simple part shapes in open die forging applications including bars and blocks, disks, stepped-shafts as well as other simple open-die shapes. Semi-closed die or closed-die forging applications can also be used on Inconel 625 parts that have higher volumes, require finer tolerances and less material waste on the completed forged part, or have specific grain flow requirements for enhanced mechanical properties.

Inconel forged parts are used in various industrial applications. The aerospace sector especially relies on Inconel 625 forged parts for many different components, including aircraft engines, including fuel lines, heat exchanger casings, and rocket components.

Inconel 625 forged parts are also used for the following applications:

  • Heat shields
  • Furnace hardware
  • Gas turbine engine ducting
  • Combustion lines/spray bars
  • Chemical plant hardware
  • Special seawater applications

At Weldaloy Specialty Forgings, we are a custom forging factory committed to providing customers with quality Inconel 625 parts. We offer open-die and semi-closed-die forging capabilities, along with heat treat and machining. We provide metallurgical services for projects that require it, which include specifications on grain size and grain direction, to ensure that our finished products meet your mechanical and other testing standards. Our team of engineers and quality personnel oversee our Inconel 625 parts at every step of production and testing to ensure the quality of our products.

Below is a general guideline for Weldaloy’s Inconel 625 forging capabilities. Please contact us for the specific requirements of your Inconel 625 forged parts.


Weldaloy Specialty Forgings stands ready to be your Inconel 625 or Inconel 718 forging partner.

Send us your request for quote today – and discover the Weldaloy Specialty Forgings difference.