En19 alloy steel

Introduction

We manufacture forging ingots, billets, and blooms in alloy steel specifically for En19, tailored for high-performance applications.  

En19 is a medium carbon, low alloy chromium-molybdenum steel designed for high strength, toughness, and wear resistance. It is commonly used in heavy-duty and high-stress applications such as automotive, transmission, and engine components. The chromium and molybdenum content improves hardenability and Mechanical properties , making En19 suitable for parts subjected to repetitive stress and high loads

Chemical composition

Element Content (%) Function / effect
Carbon (c) 0.35 – 0.45 Provides hardness and strength
Manganese (mn) 0.50 – 0.80 Improves hardenability and toughness
Sulfur (s) Max 0.050 Impurity; low content improves 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 – 1.50 Increases hardness, wear resistance, and corrosion resistance
Nickel (ni) Nil Not present or in trace amounts
Molybdenum (mo) 0.20 – 0.40 Improves hardness, toughness, and high temperature strength

Mechanical properties (typical values, may vary based on heat treatment  and manufacturing processes)

  • Tensile strength : approx. 850 – 1100 MPa
  • Yield strength : approx. 650 – 900 MPa
  • Hardness: 28  – 38 hrc (customizable by heat treatment)
  • Impact toughness : high
  • Fatigue resistance : excellent

    • Heat treatment

    • Annealing: softens the steel to improve machinability before final processing
    • Quenching: heating to ~830 – 870°c followed by rapid cooling to form hard martensitic structure
    • Tempering: reheating to moderate temperatures to relieve internal stresses and balance hardness with toughness
    • Heat treatment  can be optimized to achieve desired Mechanical properties  based on application needs.

    Key features and benefits

    • Uniform through hardening for consistent performance
    • High strength and toughness for heavy load and impact resistance
    • Excellent wear resistance for longer component life
    • Good machinability after annealing
    • Dimensional stability with minimal distortion after heat treatment
    • Suitable for forging, machining, and other manufacturing processes

    Typical applications

    • Shafts, gears, and axles in automotive and industrial machines
    • High-stress forged parts in heavy machinery
    • Transmission components
    • Engine parts and connecting rods
    • Other critical components subjected to repetitive mechanical loads

    Equivalent steel grades

    • En19 (bs en 10083-1): european standard alloy steel
    • Aisi 4140: american standard similar to En19
    • 42CrM04: closely related european grade

    Why choose En19 for your application?

    En19 provides an excellent balance of high strength, toughness, and wear resistance, making it ideal for demanding industrial applications. Its good machinability and dimensional stability after heat treatment  make it cost-effective for manufacturing high-performance components.

    Comparison table for similar grades

    Grade Carbon (%) Key applications Heat treatment Comments
    En19 0.35-0.45 Shafts, gears, automotive parts Quenching & tempering High strength and toughness
    Aisi 4140 0.38-0.43 Automotive, gears, shafts Quenching & tempering Common american equivalent
    42CrM04 0.38-0.45 General engineering, shafts Quenching & tempering European equivalent

    Summary

    En19 is a medium carbon chromium-molybdenum alloy steel optimized for applications that require high toughness, strength, and wear resistance. It is commonly used in automotive, heavy machinery, and general engineering parts subjected to high stress.