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All Categories > Alloyed Bars and Plates > Hot Rolled Alloy Steels > 4140 Annealed Hot Rolled Alloy Steels > 4140 Hot Rolled Annealed Alloy Steel - Rounds  
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4140 Hot Rolled Annealed Alloy Steel - Rounds

71 Items Available

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These are oil-hardening steels of relatively high hardenability. Their chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. These grades are especially suitable for forging because they have self-scaling characteristics. They respond readily to heat treatment and are comparatively easy to machine in the heat treated condition. They resist creep in temperatures up to 1000°F and maintain their properties even after long exposure at these relatively high working temperatures. With a combination of such highly desirable properties as good strength and wear resistance, excellent toughness coupled with good ductility, and the ability to resist stress at elevated temperatures, it is understandable why these are widely used and highly successful alloy steels.

This material is also available as leaded steel. The addition of lead improves machinability without sacrificing other desirable properties, with the exception that the use of this material is not recommended for applications over 400°F, since at elevated temperature ductility is low.

The following specifications are generally applicable for 4140/42 Heat Treated Rounds: ASTM A 193, Grade B7; ASTM A 434, Grades BC and BD.

Machine Straightened — Maximum Brinell 212

Stock Lengths 20' Approx.


Item #

Estimated Weight per Foot

Estimated Weight 20-Ft. Bar

3/8 .3759 lb 7.517 lb
1/2 .6682 lb 13.36 lb
9/16 .8457 lb 16.91 lb
5/8 1.044 lb 20.88 lb
11/16 1.263 lb 25.27 lb
3/4 1.504 lb 30.07 lb
7/8 2.046 lb 40.93 lb
1 2.673 lb 53.46 lb
1 1/8 3.383 lb 67.66 lb
1 1/4 4.176 lb 83.53 lb
Showing 10 of 71  |  View All 71 Standard Items

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