EN24 is a high-strength, high-toughness nickel–chromium–molybdenum alloy steel widely used for demanding engineering applications. It is known for its excellent hardenability, fatigue strength, wear resistance, and impact toughness, even in larger cross-sections. EN24 is commonly supplied in the quenched and tempered (Q&T) condition to achieve very high mechanical strengths. It is one of the strongest commercially available alloy steels and is preferred where components must withstand heavy load, shock, torsion, and wear.

Key Properties of EN24

1. Very High Tensile Strength

In the Q&T condition, EN24 typically reaches:
a. 850 – 1200 MPa tensile strength
b. 30 – 40 HRC hardness (depending on heat treatment)
It can be induction hardened to 55–60 HRC for wear-critical surfaces.

2. Outstanding Toughness & Fatigue Resistance

EN24 is excellent for components under:
a. impact loads
b. torsional stress
c. cyclic fatigue
d. shock and vibration

3. Excellent Hardenability

Maintains strength even in large diameters, making it ideal for heavy shafts and industrial machine parts.

4. Good Wear Resistance

Due to a combination of nickel, chromium, and molybdenum.

5. Moderate Machinability

Machinable in annealed or tempered conditions.

6. Weldability

Possible but requires preheating (250–350°C) and post-weld heat treatment to avoid cracking due to high hardenability.

Typical Applications of EN24

EN24 is widely used across automotive, aerospace, defense, mining, fabrication, heavy machinery, and oil & gas industries. Common components include:
1. Heavy-duty shafts, propeller shafts & transmission shafts
2. Gears, pinions, spur gears & bevel gears
3. High-strength studs, bolts, tie rods
4. Crankshafts, camshafts & connecting rods
5. Couplings, spindles & axles
6. Tool holders, collets & chuck parts
7. Heavy forging components
8. Aircraft landing gear parts
9. Press rams & high-load machine parts
10. Mining drill rods & downhole tools

Why Choose EN24?

EN24 offers the highest combination of strength, toughness, and wear resistance among standard alloy steels. It is the best choice when your application demands extreme hardness, high fatigue life, and reliability under heavy mechanical stress.