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4150 Hot Rolled SBQ Bar

Hot rolled 4150 steel bar is a medium/high-carbon alloy steel that contains chromium and molybdenum. Hot rolled 4150 steel is known for its increased hardenability and mechanical properties. The machinability of 4150 steel bar is better in the annealed form. Eaton Steel Bar Company stocks many diameters of 4150 hot rolled steel to meet the market demands. We also supply 4150 steel bar to various industries like aerospace, automotive, and tooling.

4150 hot-rolled-steel-bar


Typical applications for this grade include shafts, couplings, valves, axles, bolts, and drilling parts.


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

  • ASTM A29
  • ASTM A322

Shapes and Sizes

Eaton Steel Bar Company supplies 4150 steel bar in a variety of sizes ranging from 7/8”-15”. The shapes available for this grade include:

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Standard "4150 Grade" Chemical Composition

Carbon 0.48-0.53
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 4150"

Tensile strength (psi) 100,000 - 110,000
Yield strength (psi) 70,000 - 80,000
Elongation in 2” (%) 15 - 25
Reduction of area (%) 30 - 40
Brinell Hardness (BHN) 210 - 240