4340 HR Alloy Bar
HR 4340 steel bar is a nickel-chromium-molybdenum medium carbon alloy steel that is known for its toughness. This steel grade also has excellent ductility and strength compared to other alloy steels. 4340 HR bar has a good impact, wear, and abrasion resistance properties in a hardened condition. This grade is often because it provides hardenability and strength that other steel grades cannot provide. Eaton Steel Bar Company stocks many diameters of 4340 hot rolled steel to meet the markets demand. We also supply 4340 steel bar to various industries like aerospace, automotive, construction, and tooling.
4340 HR Steel Bar Applications
Typical applications for this grade include axle shafts, heavy duty shafting, mine drilling parts, and aerospace parts.
Shapes and Sizes
Eaton Steel Bar Company supplies 4340 steel bar in a variety of sizes ranging from 1/2”-15”. The shapes available for this grade include:
Standard "4340 Grade" Chemical Composition
Estimated Mechanical Property Ranges for "Grade 4340"
|Tensile strength (psi)||105,000 - 115,000|
|Yield strength (psi)||75,000 - 85,000|
|Elongation in 2” (%)||20 - 30|
|Reduction of area (%)||35 - 45|
|Brinell Hardness (BHN)||210 - 240|