4340 Steel Round Bar

4340 Steel Round Bar has high fatigue resistance that is why it is widely used around the globe.

4340 Steel Bar Stock

4340 is a nickel-chromium-molybdenum alloy steel that is characterized by its toughness and the ability to undergo heat treatment to achieve high strengths.

Because of its high fatigue resistance, it is widely used around the globe. Also, 4340 alloy steel is a medium carbon, and it has relatively large sections compared to other steels. 4340 is a type of nickel-chromium-molybdenum steel that is also known by the designation AISI 4340.

O'Hare 4340 Round Bar Stock

O’Hare Precision Metals can provide a wide range of company-supplied or customer-supplied components and materials. Just like how we can offer you the best 4340 Alloys bar stocks and 4340 Alloys round bar stocks in O’Hare!

4340 Steel Suppliers and other Processes

The 4340 material is frequently used in situations where other alloy steels lack the hardenability necessary to provide the required strength. It is an excellent choice for parts that are subjected to high levels of stress. All conventional methods of machining 4340 alloy steel are also applicable.

High quality 4340 alloy steel is typically supplied hardened and tempered in the 930 – 1080 Mpa tensile range, depending on the specific application. Moreover, when hardened, the 4340 steel exhibits excellent shock and impact resistance, as well as wear and abrasion resistance.

When this steel has been pre-hardened and tempered, it can be further surface hardened by flame or induction hardening, as well as by nitriding. The ductility of 4340 steel alloy is excellent in the annealed condition, allowing it to be bent or formed with little difficulty. Our 4340 Alloy Steel Bar Stock  can also be used for fusion and resistance welding applications.

4340 Steel for Sale

Aircraft parts, gun parts, automotive parts are just a few of the many applications of 4340 Alloys.

This 4340 alloy steel bar is a high-quality steel round bar that can be used for manufacturing structural components and building frames. 4340 steel round bar has a higher strength than other types of bars, which makes it an important component in many industries such as construction, automotive, aerospace, and marine.

The 4340 steel round bar is a popular choice for a wide range of industries because of its great strength and fatigue resistance. 4340 round bar has many advantages over other types of steel bars, such as increased stiffness, high formability with less distortion, better corrosion resistance, and higher tensile strength.

4340 round bar has a round shape, which makes it easy to work with and weld. Its round shape also helps when it comes to cutting and forming the bar into various shapes like rods, tubes, plates, bars, etc. 4340 steel round bar can be used in industries such as construction, manufacturing, aerospace engineering, utility power generation plants and water treatment plants.



Melting Range 

Specific Heat Capacity 

Electrical Resistivity 

7.85 g/cm^3


448 J/kg*K

1.09 µΩ.m

Chemical Properties









Carbon 0.38 – 0.43

0.7 – 0.9

0.6 – 0.8

0.2 – 0.3

1.65 – 2.0


0.15 – 0.3


Buy 4340 Alloy Steel Bar

High Quality 4340 alloy steel bar is a type of steel that is made up of iron and chromium. It is known for its strength and resistance to corrosion. The 4340 alloy steel bar is a high-quality steel round bar. It is primarily used in the construction industry for the manufacture of structural components and building frames.

This 4340 alloy steel bar is a type of alloy steel that contains elements such as chromium, manganese, molybdenum, nickel, silicon, and vanadium. It has excellent corrosion resistance properties to resist rusting. In addition to this, 4340 steel round bar has high mechanical properties and good toughness.

4340 round bar is an iron-chromium-vanadium alloy that contains 1% or more manganese, which gives it high strength with low weight. It also has low heat treatment requirements making it easy to produce in large quantities at a low cost.

Want to know more about 4340 Alloys? Just contact our highly skilled personnel in O’Hare Precision Metals. They are dedicated to providing smooth-flow service. Request a quote for 4340 Alloys bar stocks now!