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2021-06-04 作者:Datong Hydraulic

what is 4140 hot rolled steel bar

what is 4140 hot rolled steel bar
2021-06-04 作者:Datong Hydraulic

4140 hot rolled  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.

Standard “4140 Grade” Chemical Composition

Carbon0.38-0.43
Manganese0.75-1.00
Phosphorus (max)0.035
Sulfur (max)0.040
Silicon0.15-0.35
Chromium0.80-1.10
Molybdenum0.15-0.25

 

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
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