Steeltopia specializes in the import and export of Chinese steel.

Today we will learn about scm440.​

SCM440, which we commonly talk about, is a type of alloy steel that falls under the Japan Industrial Standards (JIS) designation system. Also known by the AISI/ASTM designation 4140. Let’s find out what SCM440 means, its usage, features, and advantages.

What is SCM440?

SCM is the JIS designation prefix for structural steel. “SCM” stands for “structural chrome molybdenum” steel. Adding chromium (Cr) and molybdenum (Mo) improves the strength and toughness of steel.​

440 is a numerical designation within the SCM series, indicating the specific union configuration and properties of the steel. In the case of SCM440, it generally refers to a chromium-molybdenum alloy steel with a carbon content of about 0.38 to 0.43%.

Purpose of using SCM440

SCM440 steel is a versatile material that combines high strength, toughness, wear resistance and machinability. This applies to a wide range of industries, where these properties are important and utilized in a variety of components and structures.

1. Automotive industry:​

Shafts and axles: SCM440 steel is commonly used to manufacture shafts and axles in automotive drivetrain systems such as transmission shafts, differential components, and axle shafts. High strength and toughness help withstand the torque and bending loads encountered during vehicle operation.

Gears and Gearboxes: Gears made of steel are used in automotive transmissions, transfer cases, and differentials because of their wear resistance and fatigue strength. Memory boxes also benefit from SCM440 components in terms of durability and reliability.

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2. Machinery and equipment manufacturing:

​Machine Components: A variety of machine components, including crankshafts, spindles, hydraulic cylinders, and tooling components, are often made of SCM440 steel. Its excellent strength, toughness and machinability make it suitable for withstanding the high loads and wear of industrial machinery.

Fasteners and Bolting: High-strength bolts, screws, nuts and other spanners are commonly made of SCM440 due to its excellent mechanical properties and ability to maintain integrity under high tensile loads.

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3. Aerospace and Defense:

Structural Components: In aerospace and defense applications, SCM440 steel is utilized in structural components such as aircraft landing gear components, engine components, and missile components. Its high strength-to-weight ratio and high fatigue resistance make it ideal for withstanding extreme operating conditions. 

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4. Oil and gas industry:

​Drill Collars and Drill Pipes: SCM is used to manufacture drill collars and drill pipes used in oil and gas exploration and drilling operations. They require high strength, toughness, and resistance to wear and corrosion to withstand the challenging conditions encountered in the drilling environment.

Valves and Fittings: Valves, fittings and other equipment used in oil and gas processing facilities often use SCM440 steel due to its corrosion resistance and ability to maintain structural integrity at elevated temperatures and temperatures.

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5. Construction and infrastructure:

​Structural Steel Components: Utilized in construction and infrastructure projects for structural components such as beams, columns and connecting rods. Its high strength and durability ensure the stability and lifespan of buildings, bridges, and other structures.

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6. Mold making:

​Tool Components: SCM440 steel is used in the manufacture of tool and die components such as molds, dies, and punches for metal forming and manufacturing processes. Its hardness, wear resistance and machinability make it suitable for producing precision tools that can withstand the toughest manufacturing tasks.

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Overall, SCM440 is an important material for numerous industries and applications where high strength, toughness, wear resistance and machinability are essential requirements. Its versatile performance makes it the preferred choice for manufacturing parts and structures under demanding operating conditions.

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SCM440 Features and Benefits

- High Strength: Demonstrates excellent strength and toughness.

- Excellent hardenability: Desired mechanical properties can be achieved by hardening through heat treatments such as quenching and tempering. This allows the manufacturing process and material properties to be tailored to specific applications.

- Excellent wear resistance: The addition of chromium and molybdenum improves the wear resistance of steel. Suitable for applications subject to wear and impact, such as gears, shafts, and tool parts.

- Machinability: Although SCM440 is relatively hard, it still offers excellent machinability compared to other high-strength alloy steels.

- Weldability: Can be welded using conventional welding methods, but precautions must be taken to avoid problems such as cracking during welding. Certain applications may require preheating and post-weld heat treatment to minimize the risk of weld-related defects.

​Today, we analyzed the meaning of SCM440 (AISI 4140), used it, and introduced its features and advantages.

SCM440 is a material we also handle and is imported directly from China at a reasonable price.

You can find round bars, pipes, etc.

If you have any questions, please leave a comment or call us and we will assist you.