Grade EN9
EN9 is a high-carbon, medium-tensile engineering steel known for its excellent strength, wear resistance, and toughness. With a higher carbon content than EN8, EN9 offers significantly improved hardness and abrasive wear resistance, making it ideal for heavy-duty mechanical components that undergo shock, stress, and repeated loading.
EN9 is commonly supplied in the normalized condition, but it can be heat-treated to achieve much higher hardness and strength levels where required. Due to its durability and affordability, EN9 is widely used in automotive parts, general engineering, machinery components, and industrial tools.
Key Properties of EN9 Steel
1. High Strength & Toughness
EN9 provides higher tensile strength than EN8, making it suitable for parts subjected to constant heavy loads, shock, and bending stresses.2. Excellent Wear Resistance
Ideal for gears, rollers, tools, and components exposed to friction and abrasive conditions.3. Heat Treatable to High Hardness
EN9 responds very well to:
a. Hardening & tempering (achievable hardness: 50–55 HRC)
b. Induction or flame hardening (surface hardness: 55–60 HRC)
This makes EN9 suitable for tools and components requiring a hard surface with a tough core.
4. Good Machinability (Before Hardening)
Machinable in the normalized or annealed condition. Machining becomes difficult after hardening due to increased hardness.5. Moderate Weldability
Weldable only with proper preheating and post-weld heat treatment (due to high carbon). Not recommended for critical welded structures.Common Applications
EN9 is widely used in heavy mechanical engineering, automotive, agriculture, and fabrication industries. Typical applications include:
1. Gears, sprockets, pinions & gear shafts
2. Heavy-duty axles and crankshafts
3. Hammers, chisels & hand tools
4. Camshafts & connecting rods
5. Railway parts
6. Industrial machine tools
7. Rollers, rams & levers
8. Shear blades & cutting tools
9. Wear-resistant machine parts