4140 Hot Rolled Bar

Capital Steel & Wire is a leading domestic and international distributor of 4140 grade hot rolled steel bar stock.

4140 hot rolled bar is a medium carbon alloy steel with good fatigue and impact resistance after heat treating. 4140 hot rolled steel has many applications, including drill collars, chain pins, bolts and sprockets.

Below you will find chemical and mechanical properties for 4140. Keep in mind that mechanical properties vary between annealed and heat treated 4140 steel.

4140 Chemical Properties

Carbon 0.38-0.45
Manganese 0.75-1.00
Phosphorus, Max % 0.035
Sulfur, Max % 0.040
Silicon 0.15-0.35
Chromium 0.80-1.10
Molybdenum 0.15-0.25

4140 Mechanical Properties (Annealed)

Tensile Strength 90,000-100,000 ksi
Yield Strength 60,000-70,000 ksi
Elongation in 2" 20-30%
Reduction of Area 50-60%
Brinelle Hardness 185-210

4140 Mechanical Properties (Heat Treated)

Tensile Strength 130,000 ksi
Yield Strength 110,000 ksi
Elongation in 2" 16%
Reduction of Area 50%

We are able to supply HR 4140 steel bar stock in various diameters and shapes including the following:

  • 4140 rounds
  • 4140 squares
  • 4140 flats
  • 4140 hexes

Capital Steel & Wire is equipped with machinery that enables us to customize your order to your needs. Visit our Processing page to view all of our steel bar and wire processing capabilities. If you are having trouble finding what you are looking for, please use the contact form to your right. We're dedicated to helping you find the right steel type for your application.