BS 970 EN9 / AISI 1055 / DIN C55

EN9 grade steel, also known as 070M55, is a medium carbon steel that stands out for its excellent strength, toughness, and wear resistance. Widely used across various industries, EN9 is renowned for its ability to perform under high-stress conditions, making it a preferred material for components that demand durability and reliability. In this article, we'll delve into the properties, benefits, and applications of EN9 grade steel.

Key Features of EN9 Grade Steel

1. Chemical Composition:

• Carbon (C): 0.50-0.60%
• Manganese (Mn): 0.50-0.80%
• Silicon (Si): 0.10-0.40%
• Phosphorus (P): Max 0.05%
• Sulfur (S): Max 0.05%

2. Mechanical Properties:

• Tensile Strength: 600-750 MPa
• Yield Strength: 350-450 MPa
• Hardness: 200-260 HB

3. Physical Properties:

• Density: 7.85 g/cm3

Advantages of EN9 Grade Steel

1. High Strength: EN9 steel offers excellent tensile and yield strength, making it suitable for high-stress applications where durability is paramount.

2. Good Wear Resistance: The medium carbon content and balanced composition provide good wear resistance, extending the lifespan of components made from this steel.

3. Machinability: EN9 can be machined relatively easily, allowing for the production of precise components without compromising on quality.

4. Heat Treatability: This steel can be heat treated to enhance its mechanical properties, offering flexibility in its application across different industries.

5. Toughness: EN9 maintains good toughness even at lower temperatures, ensuring reliability in various working conditions.

Applications of EN9 Grade Steel

Thanks to its impressive properties, EN9 grade steel is used in a wide range of applications, including:

1. Automotive Industry: EN9 is ideal for manufacturing automotive components such as axles, shafts, and crankshafts. Its strength and wear resistance ensure these parts can withstand the demands of high-speed and high-load environments.

2. Mechanical Engineering: This steel is commonly used to produce gears, sprockets, and cams. Its machinability and toughness make it a reliable choice for precision engineering applications.

3. Industrial Machinery: EN9 is used in the manufacture of various industrial machinery components, including rollers, knives, and cutting tools. Its ability to endure high wear and stress ensures the efficiency and longevity of machinery.

4. Construction Equipment: The robustness of EN9 makes it suitable for heavy-duty construction equipment such as pins, bushes, and excavator parts. It can handle the rigorous conditions of construction sites effectively.

5. General Engineering Applications: EN9 is also used in the production of general engineering components such as spindles, bolts, and studs, where its strength and durability are essential.