En18 alloy steel

Introduction

We manufacture forging ingots, billets, and blooms in alloy steel specifically for En18, developed for high-strength engineering and automotive applications.

En18 is a medium carbon chromium alloy steel known for its high tensile strength, good toughness, and excellent wear resistance after heat treatment. It is widely used for components subjected to high stress, shock loads, and repetitive fatigue.

The chromium content improves hardenability and wear resistance, enabling effective through hardening. En18 offers good machinability in the annealed condition and maintains dimensional stability after heat treatment, making it suitable for forging and precision machining processes.

This grade delivers an excellent balance of strength, durability, and cost effectiveness for demanding industrial applications.

Chemical composition

Element	Content (%)	Function / effect
Carbon (c)	0.35 – 0.45	Provides strength and hardness
Manganese (mn)	0.60 – 0.90	Improves hardenability and toughness
Silicon (si)	0.15 – 0.35	Enhances strength and elasticity
Chromium (cr)	0.90 – 1.20	Increases hardness and wear resistance
Phosphorus (p)	Max 0.035	Controlled impurity; improves toughness
Sulphur (s)	Max 0.035	Controlled impurity; aids machinability

Mechanical properties (typical, depending on condition & heat treatment)

• Tensile strength: 850 – 1000 MPa
• Yield strength: 650 – 800 MPa
• Hardness: 28 – 34 hrc
• Impact toughness: good
• Fatigue resistance: excellent

Heat treatment

• Annealing: softens the steel to improve machinability before final processing.
• Quenching: heating to approximately 830 – 860°c, followed by rapid cooling to obtain a hardened structure.
• Tempering: reheating to a controlled temperature to relieve internal stresses and improve toughness while maintaining required hardness.

Heat treatment parameters can be adjusted to suit specific application requirements.

Key features and benefits

• Good through-hardening capability
• High strength and toughness
• Excellent wear resistance
• Good machinability in annealed condition
• Dimensional stability after heat treatment
• Suitable for forging and machining operations

Typical applications

• Shafts and axles
• Gears and pinions
• Connecting rods
• Automotive and heavy engineering components
• High-stress machine parts

Equivalent steel grades

En18 has several close international equivalents, including:

• 41Cr4 (en 10083)
• Din 1.7035
• AISI / SAE 5140

(exact equivalence may vary slightly depending on standard and heat treatment condition.)

Why choose En18 alloy steel?

En18 is a widely trusted alloy steel grade offering excellent mechanical performance at a competitive cost. Its reliable heat treatment response, good machinability, and long service life make it a preferred choice for high-stress engineering and automotive components.

Comparison table for similar grades

Grade	Carbon (%)	Key applications	Heat treatment	Comments
En18	0.35 – 0.45	Shafts, gears, axles	Quenching & tempering	Widely used alloy steel
41Cr4	0.38 – 0.45	Automotive components	Q&t	Close european equivalent
En19 (42CrM04)	0.38 – 0.45	Heavy-duty parts	Q&t	Higher strength due to mo
Aisi 5140	0.38 – 0.43	Automotive & machinery	Q&t	Us equivalent

Summary

En18 is a versatile chromium alloy steel suitable for through-hardening applications. It provides high strength, wear resistance, and durability for a wide range of demanding industrial uses.