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8640 Hot Rolled SBQ Bar

8640 steel is known for its toughness and wear resistance, which is achieved after the low alloy steel has been carburized, or case hardened. Eaton Steel Bar Company stocks many diameters of 8640 hot rolled steel bars to meet the market demand. We supply AISI 8640 steel bars to various industries including oil & gas, automotive and military.

1018 hot-rolled-steel-bar


Typical applications for this grade of steel include forged tools, gears, axles, crankshafts and more. 8640 steel is usually heat treated and given an oil quench to reach maximum strength and hardness. 

Shapes and Sizes

Eaton Steel Bar Company supplies 8640 steel bar in a variety of sizes ranging from 3/4”- 3”. The shapes available for this grade include:

  • Rounds
  • Rounded Cornered Square

Standard "8640 Grade" Chemical Composition

Carbon .38-.43
Manganese .75-1.0
Phosphorus (max) .035
Sulfur (max) .04


Estimated Mechanical Properties for "Grade 8640"

Tensile strength 95,700 psi
Yield strength 53,700 psi
Elongation in 2” 26%
Reduction of area 62%
Brinell Hardness 197