42CrMo4 / 1.7225 Alloy Steel

Steel hexagon 1.7225 / 38XM / 42CrMo4

Steel hexagon 1.7225 (38XM / 42CrMo4) is a high-strength alloy steel that combines excellent wear resistance, toughness, and impact strength. Due to its chromium and molybdenum content, this alloy has exceptional hardenability, making it ideal for components operating under extreme mechanical loads.

Key Properties

✅ High strength – capable of withstanding significant mechanical stress.
✅ Fatigue resistance – ensures long service life under dynamic loads.
✅ Excellent hardenability – uniform hardness distribution across the cross-section.
✅ Superior impact toughness – prevents failure under shock loads.
✅ Good machinability – easy to cut, grind, and heat treat.
✅ Suitable for carburizing and nitriding – enhances surface properties.

Chemical Composition (%)

• Carbon (C): 0.38-0.45
• Silicon (Si): 0.10-0.40
• Manganese (Mn): 0.60-0.90
• Chromium (Cr): 0.90-1.20
• Molybdenum (Mo): 0.15-0.30
• Phosphorus (P) & Sulfur (S): ≤ 0.035

Mechanical Properties

• Yield strength: 750-950 MPa
• Tensile strength: 900-1200 MPa
• Hardness after heat treatment: 50-55 HRC
• Elongation: 12-15%
• Elastic modulus: 210 GPa
• Impact toughness: ≥ 40 J/cm²

Applications

🔹 Automotive industry – crankshafts, gears, transmission components.
🔹 Mechanical engineering – shafts, spindles, axles, couplings, hydraulic pistons.
🔹 Construction equipment – high-strength bolts, nuts, tie rods.
🔹 Heavy industry – machine components subject to extreme loads.
🔹 Oil and gas sector – drilling equipment components.

Advantages Over Alternatives

🔹 Better impact toughness than 40X and 45 steels.
🔹 Higher hardenability than 1.7035 (41Cr4), making it suitable for large components.
🔹 Greater wear resistance than 20X and 30XM steels, ensuring longer service life.
🔹 Good weldability (with preheating), making it ideal for complex structures.

Conclusion

Steel hexagon 1.7225 (38XM / 42CrMo4) is an excellent choice for manufacturing high-strength mechanical components that operate in demanding conditions with high loads, impacts, and wear. Thanks to its versatile characteristics, this material is widely used in industrial manufacturing, automotive engineering, and construction sectors.

Delivery forms of steel hexagon 1.7225 / 38ХМ