About Alloy
4140 alloy is a versatile and widely used alloy steel known for its robust mechanical properties and adaptability across various applications. It is characterized by its composition, which typically includes around 0.38-0.43% carbon, 0.80-1.10% chromium, and 0.15-0.25% molybdenum. This alloy is designed to offer a balanced combination of strength, toughness, and hardness, making it suitable for a range of demanding conditions.
4140 steel is commonly employed in the manufacturing of high-stress components such as gears, shafts, and axles, where its strength and durability are essential. Its high tensile strength, which can be enhanced through heat treatment processes such as quenching and tempering, allows it to withstand significant mechanical loads and stresses. The alloy's chromium content provides excellent hardenability and resistance to wear, while molybdenum enhances its strength at elevated temperatures and improves its resistance to fatigue.
In addition to automotive and industrial applications, 4140 steel is used in the aerospace and defense industries for components that require high strength and impact resistance. Its versatility extends to applications in construction equipment, oil and gas industry components, and various types of machinery that demand a high level of performance and reliability. The alloy's ability to maintain its mechanical properties under challenging conditions makes it a preferred material for critical and high-performance applications.
Product Form & Standard
AMS 6382 bars/forgings/ flash-welded ring
AMS S 5626 bars/forgings/ flash-welded ring
Chemical Composition
| Weight% | C | Si | Mn | Cr | Mo |
| 4140 Ann | 0.40 | 0.25 | 0.85 | 1.00 | 0.25 |
| 4140 Normalised | 0.40 | 0.25 | 0.85 | 1.00 | 0.25 |
Mechanical Properties
| Alloy | Section mm | Yield Strength MPa | Tensile Strength MPa | Elongation % | Izod J | Hardness HB |
| Alloy 4140 | 50 | 770 | 930 | 17 | 90 | 275 |
| Alloy 4140 | 100 | 710 | 920 | 15 | 70 | 270 |
| Alloy 4140 | 200 | 570 | 850 | 14 | 60 | 250 |
Application
1. Automotive Industry
●Components: Crankshafts, camshafts, gears, and axles.
●Benefits: High tensile strength and toughness ensure durability and performance in engine and drivetrain components that endure significant stress and load.
2. Industrial Machinery
●Components: Shafts, gears, and components of heavy-duty machinery.
●Benefits: Offers wear resistance and strength for parts subjected to high mechanical loads and impact, enhancing reliability and reducing maintenance.
3. Aerospace Industry
●Components: Aircraft landing gear components, structural parts, and turbine shafts.
●Benefits: Provides high strength and impact resistance needed for critical aerospace components operating under extreme conditions.
4. Oil and Gas Industry
●Components: Drilling equipment, valve bodies, and components exposed to high pressure and harsh environments.
●Benefits: Excellent hardness and resistance to wear contribute to the reliability and longevity of equipment used in challenging extraction processes.
5. Defense and Military
●Components: Weapon components, armored vehicles, and other high-stress applications.
●Benefits: High impact resistance and durability make it suitable for defense applications where strength and reliability are essential.
6. Construction Industry
●Components: Structural components, reinforcing bars, and heavy-duty tools.
●Benefits: Strength and toughness support the demands of construction machinery and structures exposed to heavy loads.
7. Tooling and Dies
●Components: Tooling, dies, and molds used in manufacturing processes.
●Benefits: Hardness and resistance to deformation improve performance and precision in manufacturing tools subjected to repetitive stress.
8. General Engineering
●Components: Various mechanical components requiring high strength and reliability.
●Benefits: Versatility and strong mechanical properties make 4140 steel suitable for a wide range of engineering applications.
4140 alloy’s combination of strength, toughness, and wear resistance makes it a highly versatile material, suitable for a broad spectrum of applications across automotive, industrial, aerospace, oil and gas, defense, construction, tooling, and general engineering industries.
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