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AISI 4130 / 25CrMo4

Chemical Properties

Mechanical Properties

Typical Delivery Conditions

AISI 4130 Grade Steel: A Versatile Alloy for Various Applications

AISI 4130 is a widely used chromium-molybdenum alloy steel that offers an excellent combination of strength, toughness, and versatility. It belongs to the low-alloy steel category and is known for its exceptional weldability and machinability. The "AISI" in its name stands for the American Iron and Steel Institute, while the numbers denote the composition and properties of the steel.
AISI 4130 steel primarily consists of iron, carbon, chromium, and molybdenum that provides high tensile strength, good impact resistance, and moderate hardness.


Key Features


  • Strength and Toughness: AISI 4130 steel offers an excellent balance between strength and toughness, making it suitable for applications where both properties are crucial. It can withstand heavy loads and impact forces without succumbing to brittleness.

  • Weldability: One of the standout features of AISI 4130 is its weldability. It can be easily welded using common welding techniques without the need for preheating or post-weld heat treatments, reducing production time and costs.

  • Machinability: The alloy's composition lends itself to easy machining, enabling the production of intricate components with high precision and minimal tool wear.

  • Corrosion Resistance: The chromium content in AISI 4130 provides a level of corrosion resistance, making it suitable for applications where exposure to various environmental conditions is a concern.

  • Versatility: AISI 4130 steel finds its applications in various industries, including aerospace, automotive, oil and gas, structural engineering, and manufacturing. It is used in components such as aircraft engine mounts, tubing for oil and gas drilling, bicycle frames, and more.




  • Aerospace: AISI 4130 is utilized in aircraft components such as engine mounts, landing gear parts, and structural elements due to its high strength-to-weight ratio and fatigue resistance.

  • Automotive: In the automotive industry, this steel is often used in roll cages, suspension components, and drivetrain parts for its combination of strength and weldability.

  • Oil and Gas: AISI 4130 tubing is commonly employed in the oil and gas sector for drilling applications, particularly in corrosive environments where its resistance to stress and cracking is crucial.

  • Manufacturing: Its machinability makes it a preferred choice for producing precision components, tooling, and machinery parts.

  • Structural Engineering: AISI 4130 is used in the construction of various structures where a balance between strength and weight is essential.

In conclusion, AISI 4130 grade steel is a versatile alloy with a wide range of applications across various industries. Its remarkable combination of strength, toughness, weldability, and machinability makes it a popular choice for designing and fabricating components that require reliable performance under diverse conditions.

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