En24 alloy steel

Introduction

we manufacture forging ingots, billets, and blooms in alloy steel specifically for En24, tailored for high-performance applications. En24 is a high-strength, nickel-chromium-molybdenum alloy steel known for its exceptional toughness, high tensile strength, and excellent fatigue resistance. It is specifically designed for heavy-duty and critical engineering applications where components are subjected to extreme stress, shock loads, and fatigue. The addition of nickel significantly enhances toughness and impact strength, making En24 one of the most reliable alloy steels for high-performance applications.

Additionally, En24 exhibits superior wear resistance and can withstand high operating temperatures, making it ideal for use in gearing, shafts, and high-stress mechanical parts. Its versatility in forging and heat treatment processes allows for optimized performance in demanding industrial environments.

Chemical composition

Element	Content (%)	Function / effect
Carbon (c)	0.35 – 0.45	Provides high strength and hardness
Manganese (mn)	0.45 – 0.70	Improves hardenability and toughness
Sulphur (s)	Max 0.050	Impurity; controlled for better machinability
Phosphorus (p)	Max 0.050	Impurity; low content improves toughness
Silicon (si)	0.10 – 0.35	Increases strength and elasticity
Chromium (cr)	0.90 – 1.40	Improves hardness, wear resistance, and hardenability
Nickel (ni)	1.30 – 1.80	Significantly improves toughness and impact strength
Molybdenum (mo)	0.20 – 0.35	Enhances hardenability, high-temperature strength, and toughness

Mechanical properties (typical values after quenching & tempering)

• Tensile strength: approx. 850 – 1200 MPa
• Yield strength: approx. 680 – 950 MPa
• Hardness: 28 – 40 hrc (adjustable by heat treatment )
• Impact toughness: very high
• Fatigue resistance: excellent

Heat treatment

• Annealing: used to soften the material for machinability prior to final processing
• Quenching: heating to approx. 830 – 860°c followed by oil quenching to achieve a hard martensitic structure
• Tempering: reheating to control hardness, relieve internal stresses, and achieve optimum toughness

Heat treatment parameters can be modified to meet specific mechanical property requirements.

Key features and benefits

• Exceptional toughness and impact resistance due to high nickel content
• High tensile and yield strength for critical load-bearing applications
• Excellent fatigue and shock load resistance
• Good through-hardening capability
• Good machinability in annealed condition
• Dimensional stability after heat treatment
• Ideal for heavy-duty forging and machining applications

Typical applications

• Aircraft and aerospace components
• Heavy-duty shafts, gears, and pinions
• Crankshafts and connecting rods
• High-strength bolts, studs, and fasteners
• Automotive and defence engineering components
• Parts subjected to high shock and fatigue loads

Equivalent steel grades

• En24 (bs 970): british standard
• AISI 4340: american standard equivalent
• 34CrNimo6: european equivalent
• Din 1.6582: german standard

Why choose En24 for your application?

En24 offers a superior combination of very high strength, toughness, and fatigue resistance. Its nickel content makes it especially suitable for applications where shock loading and reliability are critical. This grade is a preferred choice for safety-critical and high-performance engineering components.

Comparison table for similar grades

Grade	Carbon (%)	Key applications	Heat treatment	Comments
En24	0.35-0.45	Shafts, gears, aerospace parts	Quenching & tempering	Very high toughness & strength
Aisi 4340	0.38-0.43	Automotive, defence, gears	Quenching & tempering	American equivalent
34 CrNi mo6	0.30-0.38	Heavy engineering components	Quenching & tempering	European equivalent

Summary

En24 is a premium nickel-chromium-molybdenum alloy steel designed for extreme performance. It is ideal for components requiring very high strength, excellent toughness, and long service life under severe operating conditions.