EN 19 / AISI 4140 / DIN 42CRMO4 / JIS SCM440

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EN19 grade steel, also known as 709M40, is an alloy steel renowned for its superior strength, toughness, and wear resistance. This high-tensile steel is widely used in various engineering and automotive applications due to its excellent mechanical properties and ability to withstand high stress and impact. In this article, we will explore the features, benefits, and applications of EN19 grade steel, highlighting why it is a preferred choice for critical components.

Key Features of EN19 Grade Steel

1. Chemical Composition:

• Carbon (C): 0.36-0.44%
• Silicon (Si): 0.10-0.35%
• Manganese (Mn): 0.50-0.80%
• Chromium (Cr): 0.90-1.20%
• Molybdenum (Mo): 0.25-0.35%
• Sulfur (S): Max 0.035%
• Phosphorus (P): Max 0.035%

2. Mechanical Properties:

• Tensile Strength: 850-1000 MPa
• Yield Strength: 680-880 MPa
• Hardness: 248-302 HB

3. Physical Properties:

• Density: 7.85 g/cm3

Advantages of EN19 Grade Steel

1. High Tensile Strength: EN19 steel offers exceptional tensile strength, making it suitable for high-stress applications where durability is crucial.

2. Excellent Toughness: The alloying elements, particularly chromium and molybdenum, enhance the toughness of EN19, allowing it to absorb shock and impact without fracturing.

3. Wear Resistance: EN19’s wear resistance makes it ideal for components exposed to friction and abrasion, ensuring a longer lifespan.

4. Good Machinability: Despite its high strength, EN19 can be machined relatively easily, enabling the production of precision-engineered components.

5. Heat Treatability: EN19 steel can be heat treated to achieve a variety of mechanical properties, making it highly adaptable to different industrial requirements.

Applications of EN19 Grade Steel

EN19 grade steel is used in a wide range of industries due to its impressive properties. Some common applications include:

1. Automotive Industry: EN19 is extensively used for manufacturing high-stress automotive components such as crankshafts, gears, axles, and connecting rods. Its ability to withstand high loads and resist wear makes it ideal for these critical parts.

2. Mechanical Engineering: In the field of mechanical engineering, EN19 is used to produce shafts, spindles, and other components that require high strength and toughness. Its machinability ensures precise and reliable parts.

3. Aerospace Industry: EN19’s excellent mechanical properties make it suitable for aerospace applications, including aircraft landing gear and other high-stress components that demand reliability and performance.

4. Oil and Gas Industry: The steel’s wear resistance and toughness make it ideal for use in drilling equipment, valves, and other components exposed to harsh environments and high pressures.

5. Power Generation: EN19 is used in power generation equipment such as turbine shafts and rotor shafts, where high strength and resistance to fatigue are essential.

6. General Engineering: The versatility of EN19 allows it to be used in various general engineering applications, including bolts, studs, and machine parts that require a balance of strength and machinability.