When strength meets precision and performance demands reliability under extreme stress, few materials rise to the challenge like 42CrMo4 alloy steel. At Behari Lal Engineering, a leading 42CrMo4 alloy steel manufacturer, we supply this versatile grade in forged, rolled, and machined formats to meet the rigorous standards of automotive, energy, and heavy machinery industries.

When Strength Meets Precision: The Power of 42CrMo4 Alloy Steel

In industries where precision is paramount and reliability is non-negotiable, few materials meet the challenge like 42CrMo4 alloy steel. Known for its excellent mechanical properties and adaptability to demanding applications, this high-performance steel is trusted across automotive, energy, and heavy engineering sectors.

At Behari Lal Engineering Limited (BLEL), a leading 42CrMo4 alloy steel manufacturer in India, we supply this versatile grade in forged, rolled, and machined formats, customized to client specifications and global standards.

What Is 42CrMo4 Alloy Steel?

42CrMo4 is a chromium-molybdenum (Cr-Mo) alloy steel, classified under the EN 10083-3 standard. Its superior hardenability, toughness, and fatigue resistance make it ideal for components subjected to dynamic, torsional, or impact stress.

International Equivalents:

- DIN 1.7225

- AISI 4140 (close equivalent)

- ASTM 42CrMo4 +QT

This steel is widely used in quench and tempered (QT) condition to enhance its strength and durability.

Chemical Composition of 42CrMo4

Element	Content (%)
Carbon (C)	0.38 – 0.45
Chromium (Cr)	0.90 – 1.20
Molybdenum (Mo)	0.15 – 0.30
Silicon (Si)	0.20 – 0.40
Manganese (Mn)	0.60 – 0.90
Sulfur (S)	≤ 0.035
Phosphorus (P)	≤ 0.035

Mechanical Properties (After QT Treatment)

Property	Typical Value
Tensile Strength	900–1100 MPa
Yield Strength	≥ 650 MPa
Elongation at Break	13–16%
Impact Toughness (ISO-V)	> 40 J at -20°C
Hardness (HRC)	28–34 (as quenched and tempered)
Modulus of Elasticity	210 GPa
Density	7.85 g/cm³

Why Choose 42CrMo4 Alloy Steel?

• High Strength & Yield
  Ideal for components under extreme torsional or static load.
• Outstanding Toughness
  Performs reliably under shock loads and low temperatures.
• Excellent Hardenability
  Enables consistent properties across large-diameter parts.
• Superior Fatigue Resistance
  Crucial for rotating and dynamically stressed components.
• Good Machinability
  Balanced mechanical strength and workability in QT condition.

Applications Across Industries

Sector	Common Uses
Automotive	Crankshafts, camshafts, gear shafts, axles
Oil & Gas	Tool joints, rotary shafts, drill collars
Heavy Machinery	Forgings, gear blanks, hydraulic components
Power Generation	Turbine bolts, couplings, forged rotors
Construction	Lifting pins, cylinders, mechanical joints
Railway & Defence	Traction gearboxes, connecting rods, frames

Heat Treatment of 42CrMo4 Steel

BLEL offers customized QT treatment based on application needs, with precise control of time and temperature.

Process	Temperature (°C)	Cooling Medium
Annealing	680–710	Furnace cooled
Normalizing	850–880	Air
Quenching	840–880	Oil or water
Tempering	540–680	Air

Our in-house thermal treatment systems ensure uniformity and repeatability—critical for safety and fatigue resistance.

Industry Insight: Rising Demand for Cr-Mo Steels

📈 Global demand for Cr-Mo alloy steels like 42CrMo4 is projected to grow significantly by 2030, driven by:

- Adoption of EV drivetrain components

- Pressure vessels for renewable energy projects

- Expansion of railway and defense infrastructure

With India emerging as a global forging hub, BLEL is at the forefront of meeting this material demand.

Why BLEL for 42CrMo4 Alloy Steel?

As a top-tier Indian manufacturer of 42CrMo4 steel, BLEL offers:

• Forged, hot-rolled, and peeled bars in multiple profiles
• ISO-certified quench and temper facilities
• Ultrasonic testing for internal soundness
• Custom mechanical properties as per engineering drawings
• Expert metallurgical consultation and after-sales support

Conclusion

42CrMo4 alloy steel is not just a material—it’s a strategic choice for high-performance engineering. Whether you're manufacturing critical rotating parts, pressure components, or structural shafts, 42CrMo4 offers the strength, ductility, and fatigue resistance your project demands.

Looking for a reliable 42CrMo4 alloy steel manufacturer?

Trust Behari Lal Engineering Limited (BLEL)—where precision metallurgy meets industrial reliability.

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