Close this search box.

8740 Steel

From Manufacturing to Aerospace: The 8740 steel offers Diverse Applications

What is 8740 Steel? An Introduction to Its Composition and Characteristics

8740 steel is a type of low-alloy steel that contains nickel, chromium, and molybdenum. This powerful combination of elements gives 8740 alloy steel exceptional hardenability, strength, and toughness properties.

The round bar stock made from 8740 bar is highly sought after for applications requiring strength, toughness, and wear resistance. One such application is high-forged fasteners, where the durability of the metal is crucial.

The chemical composition of 8740  includes Carbon (0.38 – 0.43), Manganese (0.75 – 1.00), Phosphorus (0.035 max), Sulfur (0.040 max), Silicon (0.20 – 0.35), Nickel (0.40 – 0.070), Chromium (0.80 – 1.10), and Molybdenum (0.15 – 0.25). These elements work together to create a metal that is forged at temperatures ranging from around 2200F (1205C) down to approximately 1700F (925C).

With its exceptional properties and versatile applications, 8740 bar is an excellent choice for those seeking a durable, high-performance metal.

Steel Purchaser

Request A Quote Form

Contact the best 8740 Alloy steel suppliers in the industry

At Advance Grinding Services, we have the steel you need to keep your business or venture running smoothly. Our 8740 alloy round bar stock is a superior alloy steel that’s perfect for forging items that regular carbon steel cannot handle. We take pride in supplying our clients with high-quality metals that are influenced by both thermal treatment and alloying elements during production.

You can trust us to provide you with top-tier alloys that will enable you to take on any project you encounter. Contact us today for a quote on the alloy you need. We understand the importance of supplying our clients with quality metals that they can rely on.

The 8740 alloy steel is highly sought-after due to its strength, toughness, and weldability, making it a popular choice for many applications. While many 8740 steel suppliers can be found online, you need not worry about searching for them when you can trust Advance Grinding Services.


As such, it is now understandable why this type of alloy steel is sought after getting a quick review of its components.

Consequently, its high machinability is highlighted as it is commonly combined with sulfur to further improve its machinability and make carburizing processes more effective.

With its excellent machinability, this even elevated this alloy steel’s prominence among industries.

Fortunately, Advance Grinding Services never runs out of 4140 alloy steel bars and can very much supply your needs especially if you are operating in the Illinois area!


Density 7.7-8.0
Tensile Strength 95000 psi
Yield Strength 60200 psi
Hardness (Brinell) 197
Hardness (Knoop) 219
Hardness (Rockwell) 92
Hardness (Vickers) 207
Machinability 65


8740 alloy steel is a type of low-alloy steel that contains nickel, chromium, and molybdenum. This powerful combination of elements gives 8740 alloy exceptional hardenability, strength, and toughness, making it an ideal material for various applications.

One of the most common uses for 8740 bar is in producing high-strength fasteners, such as bolts, screws, and nuts. These fasteners are used in various automotive, aerospace, and construction industries. The strength and durability of this bar make it an excellent choice for fasteners subjected to high stress and strain levels.

Another application of 8740 alloy steel is in manufacturing structural components for high-performance vehicles. These components include gears, axles, and drive shafts. The toughness and durability of 8740 steel make it well-suited for use in these high-stress applications, where failure could have serious consequences.

The aerospace industry also relies on 8740 alloy steel for various applications, including producing aircraft engine components, landing gear, and structural supports. The strength and toughness of this material make it an excellent choice for these critical applications, where safety and reliability are paramount.

In conclusion, 8740 alloy is a versatile material with many applications. Its exceptional strength, toughness, and durability make it a popular choice for high-stress automotive, aerospace, and construction applications. Whether you want to build a high-performance vehicle or a durable piece of machinery, 8740 alloy steel is an excellent choice.

Whatever industry you are from, rest assured that Advance Grinding Services can provide high-quality alloy steel for all your specific industry applications. Call us or simply request a quote from our website and acquire high-quality bar stocks today!