Alloy Steel for CNC Machining

This versatile material offers excellent strength, toughness, and wear resistance. 

What is Alloy Steel? 

Simply put, an alloy is a combination of elements with at least one metal in the compound. In the case of Alloy Steel 4140, it’s a low alloy steel with iron as its primary ingredient, but also containing low amounts of chromium, manganese, carbon, molybdenum, silicon, sulfur, and phosphorus. It is widely used across numerous industries and is an excellent material choice for machining due to its toughness, high fatigue strength, and abrasion and impact resistance. Machinability improves when it has been annealed.

Key Benefits: 

Alloy Steel 4140 is a preferred choice for manufacturing durable and high-performance components across various demanding sectors by offering: 

  • Fatigue resistance
  • Impact resistance
  • Toughness

Applications for Alloy Steel 4140

This alloy's toughness makes it a good match for a variety of industries, including: 

  • Automotive
  • Consumer goods
  • Construction and mining
  • Heavy duty equipment
  • Pumps and processing equipment
  • Railways

Alloy Steel Material Properties


  Ultimate Tensile Strength Elongation Hardness More Information
Alloy Steel 4140  95 KSI
(655 MPa)
36% 92 HRB Data Sheet