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4340 Steel Round Bar

From aerospace to automotive, 4340 steel round bar delivers superior performance.

Choose 4340 steel round bar for unbeatable strength and reliability.

The go-to choice for high-stress applications - 4340 steel round bar.

4340 steel round bar is known for its exceptional strength, making it the go-to choice for high-stress applications. It is a type of alloy steel that contains various elements such as chromium, manganese, molybdenum, nickel, silicon, and vanadium, which contribute to its high strength and toughness.

Due to its outstanding mechanical properties and resistance to fatigue, This round bar is popular in the aerospace, oil and gas, and automotive industries, where high-stress applications are prevalent. It is also useful in the manufacturing of shafts, gears, and other high-strength components.

When it comes to choosing a material for high-stress applications, It is a reliable option due to its excellent strength and durability. O’Hare Precision Metals offers a wide range of 4340 steel bar stocks in various sizes and shapes to meet the needs of any application. Contact our experts for a quote today.

Machinability of 4340 Alloy Steel

4340 alloy steel has good machinability in the annealed condition. It can be easily machined using conventional methods. However, the machinability of this alloy decreases when it is heat-treated to high hardness. It is important to choose the appropriate cutting tools and machining parameters for best results. 

The use of coolant is also recommended to prevent overheating and to extend the tool life. With the right machining techniques, 4340 alloy steel can be machined to precision, making it a popular choice in the aerospace and automotive industries.

4340 Steel Round Bar Applications

High-quality 4340 alloy steel bar is an iron-chromium-vanadium alloy that contains elements such as manganese, molybdenum, nickel, silicon, and vanadium. It has excellent corrosion resistance properties, making it suitable for use in various high-stress applications such as aircraft parts, crankshafts, gears, and shafts for the oil and gas industry.

The 4340 steel round bar is known for its high strength, toughness, and low weight, which makes it an excellent choice for structural components in the construction industry. It has low heat treatment requirements, making it cost-effective and easy to produce in large quantities.

Looking for high-quality 4340 alloy steel bar? Contact O’Hare Precision Metals to request a quote for bar stocks. Our highly skilled personnel are dedicated to providing exceptional customer service and smooth-flowing transactions.




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

Looking to buy high-quality 4340 alloy steel bar? Look no further! This type of alloy steel is known for its strength, resistance to corrosion, and excellent mechanical properties, making it ideal for use in the construction industry for structural components and building frames.

4340 alloy steel contains various elements such as chromium, manganese, molybdenum, nickel, silicon, and vanadium, which give it excellent corrosion resistance properties and high mechanical strength. Additionally, 4340 steel round bar has low heat treatment requirements, making it easy to produce in large quantities at a low cost.

If you want to learn more about 4340 alloys, our highly skilled personnel at O’Hare Precision Metals are ready to assist you. Contact us today for a quote on 4340 alloy steel bar stock and experience our smooth-flow service.

Request a quote now!