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4140 Hot Rolled SBQ Bar

Hot rolled 4140 steel bar is a medium-carbon alloy steel that has a high hardenability. This grade is also widely used for forging. Hot rolled 4140 steel also has good fatigue and impact resistance after heat treating. Eaton Steel Bar Company stocks various diameters of 4140 hot rolled steel to meet the market demands. We also supply 4140 hot rolled round bar to various industries like ATV, automotive, firearm, and military.

4140 hot-rolled-steel-bar

4140 Steel Bar Applications

Typical applications for 4140 hot rolled round steel bar include drill collars, pins, axles, bolts, and shafts.

4140 Hot Rolled Steel Bar Requirements

Eaton Steel Bar Company can meet the following specifications for this grade:

  • ASTM A29
  • ASTM A322
  • JDM QL-2 certified

4140 Hot Rolled Round Steel Bar

Eaton Steel Bar Company supplies 4140 steel bar in a variety of sizes ranging from 7/16”-15”. The shapes available for this grade include:

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Standard "4140 Grade" Chemical Composition

Carbon 0.38-0.43
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


Estimated Mechanical Property Ranges for "Grade 4140"

Tensile strength (psi) 95,000 - 105,000
Yield strength (psi) 65,000 - 75,000
Elongation in 2” (%) 20 - 30
Reduction of area (%) 35 - 45
Brinell Hardness (BHN) 200 - 230