Mild Steel Bar

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EN9 is a medium-carbon steel grade commonly used for engineering applications requiring high strength and hardness. EN9 is also known as 070M55 or AISI 1055. It's often supplied in the as-rolled or normalized condition and is suitable for applications where good wear resistance and toughness are required.

Properties of EN9:

1. Chemical Composition (approximate):

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

2. Key Characteristics:

   • High tensile strength
   • Good wear resistance
   • Good machinability
   • Moderate ductility

3. Common Applications:

   • Shafts
   • Axles
   • Spindles
   • Gears
   • Machine tools
   • Automotive parts

4. Heat Treatment:

   • Hardening: Heat to 820–860°C, followed by quenching in oil or water.
   • Tempering: Heat to 550–660°C to achieve the desired mechanical properties.

EN9 Square Bars

Square bars made of EN9 are widely used in manufacturing and machining applications. They are available in various sizes and finishes, including hot-rolled, cold-drawn, and precision-ground.

When sourcing EN9 square bars, ensure you specify:

• Dimensions (e.g., side length in mm or inches)
• Tolerances (e.g., h9, h11, etc.)
• Finish (e.g., polished, black, or machined)
• Quantity and any additional certifications (e.g., mill test certificate).